US20040137071A1 - Nanocapsule encapsulation system and method - Google Patents
Nanocapsule encapsulation system and method Download PDFInfo
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- US20040137071A1 US20040137071A1 US10/652,814 US65281403A US2004137071A1 US 20040137071 A1 US20040137071 A1 US 20040137071A1 US 65281403 A US65281403 A US 65281403A US 2004137071 A1 US2004137071 A1 US 2004137071A1
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- Y10S977/92—Detection of biochemical
Definitions
- the present invention generally relates to a field of controlled-release delivery systems for macromolecules, particularly those for nucleic acids and gene therapy. More specifically, the present invention relates to nanocapsules having a diameter of less than about 50 nanometers, in which a bioactive component is located in a core of the nanocapsule, and to methods of forming these nanocapsules.
- the organic solvent when included in the manufacturing process for nanoparticles, the organic solvent may denature the bioactive agent which reduces most, if not all, efficacy of the bioactive agent.
- denaturation of the bioactive agent may promote a toxic response upon administration of the nanoparticle, to a human subject, for example.
- organic solvent when used to prepare nanoparticles, the organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore, organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore, organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore, organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore, organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore, organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore, organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore, organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore, organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore
- organic solvents are typically removed during the manufacturing process of nanoparticles.
- inclusion of one or more organic solvent removal techniques generally increases the costs and complexity of forming nanoparticles.
- Entangling or embedding the bioactive agent in the polymeric matrix of the nanoparticle may also reduce the efficacy of the bioactive agent by permitting premature release of the bioactive agent prior to reaching a target cell. Premature release of the bioactive agent typically promotes cytotoxicity or cell death during administration of the nanoparticle.
- nanoparticles that reach the target cell are typically transported into the target cell via endosomal regulated pathways that results in lysosomal degradation of the bioactive agent and the nanoparticle. Therefore, functional activity of the bioactive agent inside the target cell may not occur since the bioactive agent and the nanoparticle undergoes degradation.
- the term “functional activity” refers to an ability of a bioactive agent to function within a target cell for purposes of providing a therapeutic effect on the target cell.
- the present invention generally relates to nanocapsules and methods of preparing these nanocapsules.
- the present invention includes a method of forming a surfactant micelle and dispersing the surfactant micelle into an aqueous composition having a hydrophilic polymer to form a stabilized dispersion of surfactant micelles.
- the method further includes mechanically forming droplets of the stabilized dispersion of surfactant micelles, precipitating the hydrophilic polymer to form precipitated nanocapsules, incubating the nanocapsules to reduce a diameter of the nanocapsules, and filtering or centrifuging the nanocapsules.
- FIG. 1 is a schematic of a method of the present invention for preparing nanocapsules.
- FIG. 1A illustrates atomic force microscopy of nanocapsule formulations prepared under different dispersion conditions.
- FIG. 1B illustrates results from an experiment documenting quantitative recovery of small amounts of DNA from releasing solutions.
- FIG. 1C illustrates cumulative release over 72 hours for nanocapsules prepared under different dispersion conditions.
- FIG. 2 illustrates relative pinocytotic activity of HacaT keratinocyte cultures treated with DNA complexes, nanocapsules containing DNA or no treatment.
- FIG. 3 illustrates the results of western blotting of total protein from rat fibroblast cultures.
- FIG. 4A illustrates
- FIG. 4B illustrates immunofluorescence microscopy of porcine dermal tissue sections from the experiment of FIG. 4.
- FIG. 5 shows incorporation of nanocapsules into a solid dosage form.
- FIG. 6A illustrates polyvinylpyrolidone nanocapsule uptake and Green Fluorescent Protein (GFP) expression in 35 mm human dermal fibroblast and immortalized keratinocyte cultures.
- GFP Green Fluorescent Protein
- FIG. 6B illustrates tumor targeting of GFP plasmid DNA by Tenascin nanocapsules.
- FIG. 6C illustrates an effect of nanocapsules that are coated with Tenascin and nanocapsules that are not coated with Tenascin on growth inhibition of squamous cell carcinoma and human dermal fibroblast (HDF) cultures.
- FIG. 7 shows uptake of HDF cultures treated with nanocapsules containing 20 mer Fitc-labeled O-methyl RNA oligonucleotides.
- the present invention generally relates to nanocapsules having a diameter of less than about 50 nanometers (nm).
- the present invention also relates to a method of preparing these nanocapsules.
- a nanocapsule is formed by partitioning a bioactive component within a core of surfactant molecules, and surrounding the surfactant molecules with a biocompatible polymer shell.
- a method for producing the nanocapsule is generally depicted at 10 in FIG. 1.
- a bioactive component 12 is homogeneously dispersed into a first aqueous composition 14 to form a hydrophilic composition (not shown).
- a surfactant composition 16 including a surfactant component (not shown) that contains a plurality of surfactant molecules, and an optional biocompatible oil component 18 , are introduced into a first dispersing apparatus 20 along with the hydrophilic composition.
- the surfactant composition 16 is subjected to conditions in the first dispersing apparatus 20 that initiate at least partial adsorption of the surfactant molecules onto a surface of the bioactive component 12 .
- Partial adsorption of surfactant molecules onto the surface of the bioactive component 12 initiates partitioning of the bioactive component 12 into a core of a shell formed from the surfactant molecules in the first aqueous composition 14 .
- Adsorption of the surfactant molecules onto the surface of the bioactive component 12 may proceed until an entire surface of the bioactive component 12 is covered by the surfactant molecules to complete partitioning of the bioactive component 12 into the core of surfactant molecules and form a surfactant micelle 22 .
- a biocompatible polymer component 24 is added to the surfactant micelle 22 to stabilize the surfactant micelle 22 located in the first aqueous composition 14 .
- the biocompatible polymer component 24 surrounds the surfactant micelle 22 in a stabilizing apparatus 26 to form a stabilized surfactant micelle 28 .
- the stabilized surfactant micelle 28 is transferred from the stabilizing apparatus 26 into a second aqueous composition 30 located in a second dispersing apparatus 32 .
- the second aqueous composition 30 includes a solute (not shown) that is capable of precipitating the biocompatible polymer component 24 that coats the stabilized surfactant micelle 28 .
- dispersed, optionally atomized precipitated nanocapsules 36 are formed.
- a surfactant composition that includes a surfactant component having a hydrophile-lipophile-balance (HLB) value of less than about 6.0 units
- HLB hydrophile-lipophile-balance
- stabilizing the surfactant micelles by adding a biocompatible polymer coats the surfactant micelles to form nanocapsules having a diameter of less than about 50 nm.
- nanoparticle refers a particle having a matrix-type structure with a size of less than about 1,000 nanometers.
- the bioactive component is entangled or embedded in the matrix-type structure of the nanoparticle.
- nanosphere refers to a particle having a solid spherical-type structure with a size of less than about 1,000 nanometers.
- the bioactive component is adsorbed onto the surface of the nanosphere or embedded in the nanosphere.
- nanocore refers to a particle having a solid core with a size of less than about 1,000 nanometers.
- the nanocore includes a bioactive component, the bioactive component is entangled in the nanocore.
- nanocapsule refers to a particle having a hollow core that is surrounded by a shell, such that the particle has a size of less than about 1,000 nanometers.
- a nanocapsule includes a bioactive component
- the bioactive component is located in the core that is surrounded by the shell of the nanocapsule.
- nanocapsule is not meant to encompass, and generally does not include, a particle having a size of less than about 1,000 nanometers, in which a bioactive component is entangled or embedded in the matrix of the nanocapsule or adsorbed onto the surrounding shell of the nanocapsule.
- the bioactive component 12 may be included into the first aqueous composition 14 as a liquid, vapor or in granular form.
- the form of the bioactive component 12 that is selected preferably permits the bioactive component 12 to (1) remain stable prior to dissolving or dispersing into the first aqueous composition 14 , (2) be homogeneously dispersed into the first aqueous composition 14 , (3) be optionally condensed to reduce a size of the bioactive component 12 , (4) be partitioned into the core of the surfactant micelles 22 , (5) be released upon degradation of the biocompatible polymer shell 24 of the nanocapsule 36 , and (6) be functionally active upon release from the nanocapsule 36 .
- the bioactive component 12 may be characterized as “hydrophilic” or “hydrophobic”.
- the term “hydrophilic” and “hydrophilicity” refers to an ability of a molecule to adsorb water or form one or more hydrogen-bond(s) with water. All references to “hydrophilic” is also understood as encompassing any portion of the molecule that is capable of adsorbing water or forming one or more hydrogen-bond(s) with water.
- the term “hydrophobic” and “hydrophobicity” refers to an ability of a molecule to not adsorb water nor form one or more hydrogen-bond(s) with water. All references to “hydrophobic” is also understood as encompassing any portion of the molecule that is not capable of adsorbing water nor forming one or more hydrogen-bond(s) with water.
- the hydrophilic bioactive component 12 is a hydrophilic bioactive component
- the hydrophilic bioactive component maybe directly added to the first aqueous composition 14 .
- the hydrophilic bioactive component 12 may be optionally dissolved or dispersed in one or more solvents, such as water, a nonpolar solvent, a polar solvent, or any combination of any of these.
- nonpolar solvent refers to a solvent that does not have a permanent electric dipole moment, and therefore has no ability for an intramolecular association with a polar solvent. Additionally, a nonpolar solvent may be characterized as a solvent that includes molecules having a dielectric constant of less than about 20 units. Similarly, the term “immiscible”, as used herein, refers to an inability of two or more substances, such as two or more liquids, solids, vapors, or any combination of any of these, to form an intramolecular association with another substance. Some non-exhaustive examples of nonpolar solvents may be found in Perry's Chemical Engineer's Handbook, Sixth Edition, which is incorporated herein by reference.
- polar solvent refers to a solvent that has a permanent electrical dipole moment, and therefore has an ability to form an intramolecular association with another polar substance, such as a liquid, a solid, a vapor or any combination of any of these. Additionally, a polar solvent may be characterized as a solvent that includes molecules having a dielectric constant of more than about 20 units. Likewise, the term “miscible”, as used herein, refers to an ability of two or more substances to form an intramolecular association with each other. Some non-exhaustive examples of polar solvents may be found in Perry's Chemical Engineer's Handbook, Sixth Edition, which has been incorporated herein by reference.
- the hydrophobic bioactive component may be dispersed or dissolved in a solvent that is capable of dispersing or dissolving the hydrophobic molecule, such as the above-mentioned water, a nonpolar solvent, a polar solvent, or any combination of any of these.
- the hydrophobic bioactive component 12 is dissolved or dispersed in a water-miscible solvent, such as, acetone, acetonitrile, ethanol, dimethyl acetamide (DMA), tetrahydrofuran (THF), dioxane, dimethylsulfoxide (DMSO), and dimethylformamide (DMF).
- a water-miscible solvent such as, acetone, acetonitrile, ethanol, dimethyl acetamide (DMA), tetrahydrofuran (THF), dioxane, dimethylsulfoxide (DMSO), and dimethylformamide (DMF).
- a water-miscible solvent such as, acetone, acetonitrile, ethanol, dimethyl acetamide (DMA), tetrahydrofuran (THF), dioxane, dimethylsulfoxide (DMSO), and dimethylformamide (DMF).
- DMA dimethyl acetamide
- THF
- the bioactive component 12 may be optionally condensed in the first aqueous composition 14 prior to forming the surfactant micelle 16 .
- the bioactive component is a polynucleotide
- the polynucleotide may be condensed using a DNA-condensing agent.
- a “DNA-Condensing Agent” is a molecule that facilitates condensation or a size reduction of DNA.
- condensation of the bioactive component 12 is not critical to the present invention, condensation of the bioactive component 12 maybe practiced to reduce the size of the bioactive component 12 .
- Condensation of the bioactive component 12 generally reduces the size of the bioactive component 12 prior to partitioning into the core of the surfactant micelle 16 . Reducing the size of the bioactive component 12 may permit maximum incorporation of the bioactive component 12 into the surfactant micelle 22 or may assist a reduction in the overall size of the nanocapsule 36 .
- Increasing the amount of the bioactive component 12 that may be included as part of the nanocapsule 36 permits incorporation of macromolecules having a large number of monomers, such as a large number of base pairs or amino acids, for example.
- the bioactive component 12 may further include additional components that are compatible with, and that do not interfere with solvation or dispersion of the bioactive component 12 .
- additional components that may be added to the bioactive component 12 include a DNA-associating moiety, which refers to a molecule, or portions thereof, that interact in a non-covalent fashion with nucleic acids.
- DNA-associating moieties may include, but are not limited to, a major-and minor-groove binder, a DNA intercalator, a polycation, a DNA-masking component, a membrane-permeabilizing component, a subcellular-localization component, or the like.
- Major- and minor-groove binders as used herein, are molecules thought to interact with DNA by associating with the major or minor groove of double-stranded DNA.
- DNA intercalator refers to a planar molecule or planar portion of a molecule thought to intercalate into DNA by inserting themselves between, and parallel to, a nucleotide base pair.
- a “polycation” is thought to associate with the negative charges on the DNA backbone.
- the DNA-associating moiety may be covalently linked through a “reactive group” to a functional component of this invention. The reactive group is easily reacted with a nucleophile on the functional component.
- reactive groups include, but are not limited to N-hydroxysuccinimide (e.g., amine), maleimide and maleimidophenyl (e.g., sulfhydryl), pyridyl disulfide (e.g., sulfhydryl), hydrazide (e.g., carbohydrate), and phenylglyoxal (e.g., arginine).
- N-hydroxysuccinimide e.g., amine
- maleimide and maleimidophenyl e.g., sulfhydryl
- pyridyl disulfide e.g., sulfhydryl
- hydrazide e.g., carbohydrate
- phenylglyoxal e.g., arginine
- DNA-masking component refers to a molecule capable of masking all or part of a polynucleotide following release from a nanocapsule to increase its circulatory half-life by inhibiting attack by degrading reagents, such as nucleases, present in the circulation and/or interfering with uptake by the reticuloendothelial system.
- degrading reagents such as nucleases
- membrane-permeabilizing component refers to any component that aids in the passage of a polynucleotide or encapsulated polynucleotide across a membrane.
- membrane permeabilizing component encompasses in part a charge-neutralizing component, usually a polycation, that neutralizes the large negative charge on a polynucleotide, and enables the polynucleotide to traverse the hydrophobic interior of a membrane.
- membrane-permeabilizers Many charge-neutralizing components can act as membrane-permeabilizers. Membrane-permeabilization may also arise from amphipathic molecules.
- a “membrane permeabilizer”, as used herein, is a molecule that can assist a normally impermeable molecule to traverse a cellular membrane and gain entrance to the cytoplasm of the cell.
- the membrane permeabilizer may be a peptide, bile salt, glycolipid, phospholipid or detergent molecule.
- Membrane permeabilizers often have amphipathic properties such that one portion is hydrophobic and another is hydrophilic, permitting them to interact with membranes.
- subcellular-localization component refers to a molecule capable of recognizing a subcellular component in a targeted cell. Recognized subcellular components include the nucleus, ribosomes, mitochondria, and chloroplasts. Particular subcellular-localization components include the “nuclear-localization components” that aid in carrying molecules into the nucleus and are known to include the nuclear localization peptides and amino acid sequences.
- the bioactive component 12 may be included at an amount that is therapeutically effective to transform a plurality of cells, such as in vitro, in vivo or ex vivo cells.
- transformation refers to a presence and/or functional activity of the bioactive component in the plurality of cells after exposing the nanocapsules to the plurality of cells.
- the amount of the bioactive component 12 may vary depending upon the bioactive component 12 , the temperature, pH, osmolarity, any solutes, any additional component or optional solvents present in the second aqueous component 30 , the surfactant composition 16 , a type or an amount of the surfactant micelle 22 , the biocompatible polymer component 24 , any desired characteristics of the stabilized surfactant micelle 28 , any desired characteristics of the nanocapsules 36 , or any combination of any of these.
- the bioactive component 12 of the nanocapsule 36 maybe supplied as an individual macromolecule or supplied in various prepared mixtures of two or more macromolecules that are subsequently combined to form the bioactive component 12 .
- Some non-exhaustive examples of hydrophilic macromolecules that may be suitable for inclusion as part of the bioactive component 12 include, but are not limited to polynucleotides, polypeptides, genetic material, peptide nucleic acids, aptamers, carbohydrates, mini-chromosomes, molecular polymers, aggregates or associations of an inorganic or organic nature, genes, any other hydrophilic macromolecule or any combination of any of these.
- hydrophobic macromolecules that may be included part of the bioactive component 12 include, but are not limited to, adregergic, adrenocotical steroid, adrenocortical suppressant, aldosterone antagonist, and anabolic agents; analeptic, analgesic, anesthetic, anorectic, and anti-acne agents; anti-adrenergic, anti-allergic, anti-amebic, anti-anemic, and anti-anginal agents; anti-arthritic, anti-asthmatic, anti-atherosclerotic, antibacterial, and anticholinergic agents; anticoagulant, anticonvulsant, antidepressant, antidiabetic, and antidiarrheal agents; antidiuretic, anti-emetic, anti-epileptic, antifibrionlytic, and antifungal agent; antihemorrhagic, inflammatory, antimicrobial, antimigraine, and
- polypeptide refers to a polymer of amino acids not limited by the number of amino acids. It is also to be understood that the term “polypeptide” is meant to encompass an oligopeptide, a peptide, or a protein, for example.
- polynucleotide refers to RNA or DNA sequences of more than 1 nucleotide in either single chain, duplex or multiple chain form.
- polynucleotide is also meant to encompass polydeoxyribonucleotides containing 2′-deoxy-D-ribose or modified forms thereof, RNA and any other type of polynucleotide which is an N-glycoside or C-glycoside of a purine or pyrimidine base, or modified purine or pyrimidine base or basic nucleotide.
- the polynucleotide may encode promoter regions, operator regions, structural regions, termination regions, combinations thereof or any other genetically relevant material.
- the term “genetic” as used herein refers to any material capable of modifying gene expression.
- the first aqueous composition 14 may be included in the method of the present invention as a gel, liquid, or in vapor form.
- the form of the first aqueous composition 14 that is selected preferably permits the first aqueous composition 14 to (1) remain stable prior to dissolving or dispersing the bioactive component, the surfactant composition 16 , the surfactant micelle 22 , or optionally the stabilizer surfactant micelle 28 , (2) homogeneously disperse the bioactive component 12 , the surfactant composition 16 , the surfactant micelle 22 , or optionally the stabilizer surfactant 28 , (3) function as a continuous phase in an oil-in-water emulsion, (4) not interfere with, or mask the functional activity of the bioactive component 12 , and (5) not modify or degrade the bioactive component 12 , the surfactant composition 16 , the surfactant micelle 22 , or optionally the stabilized surfactant micelle 28 .
- the first aqueous composition 14 may include only water, or may optionally include additional solutes or solvents that do not interfere with the method of forming the nanocapsules 36 nor mask the functional activity of the bioactive component 12 .
- an amount of the first aqueous composition 14 used to prepare the nanocapsules 36 may vary depending upon the bioactive component 12 , the surfactant composition 16 , the temperature, pH, osmolarity, optional solutes or optional solvents, the surfactant micelle 22 , the biocompatible polymer component 24 , any desired characteristics of the stabilized surfactant micelle 28 or the nanocapsules 36 .
- the bioactive component 12 may be added to the first aqueous composition 14 or the first aqueous composition 14 may be added to the bioactive component 12 . While the order of addition of the bioactive component 12 and the first aqueous composition 14 is not critical to the present invention, the hydrophilic composition (not shown) that is formed when the bioactive component 12 is dissolved or dispersed in the first aqueous composition 14 is preferably capable of maintaining a homogeneous solution or dispersion in the hydrophilic composition.
- the first aqueous composition 14 may be supplied as an individual component or supplied in various prepared mixtures of two or more components that are subsequently combined to form the first aqueous composition 14 .
- Some non-exhaustive examples of the first aqueous composition 14 include, but are not limited to, the above-mentioned water, nonpolar solvents, polar solvents, or any combination of any of these.
- water is the first aqueous composition 14 .
- the surfactant composition 16 maybe introduced into the bioactive component 12 , the first aqueous composition 14 , the hydrophilic composition as a liquid, vapor or in granular form.
- the form of the surfactant composition 16 that is selected preferably permits the surfactant composition 16 to (1) remain stable prior to introducing into the bioactive component 12 , the first aqueous composition 14 , or the hydrophilic composition, (2) be homogeneously dispersed into the bioactive component 12 , the first aqueous composition 14 , or the hydrophilic composition, (3) form a micellar structure, (4) be adsorbed onto a surface of the bioactive component 12 , the first aqueous composition 14 , the hydrophilic composition (5) displace the first aqueous composition that is located on the surface of the bioactive component 12 , (6) partition the bioactive component 12 or the hydrophilic composition into a core of the micellar structure to form the surfactant micelle 22 , and (7) provide a thermodynamic driving force that is effective to reduce
- a “surfactant” refers to any molecule containing a polar portion that thermodynamically prefers to be solvated by a polar solvent, and a hydrocarbon portion that thermodynamically prefers to be solvated by a non-polar solvent.
- surfactant is also meant to encompass anionic, cationic, or non-ionic surfactants.
- anionic surfactant refers to a surfactant with a polar portion that ionizes to form an anion in aqueous solution.
- a “cationic surfactant” refers to a surfactant having a cationic polar portion that ionizes to form a cation in aqueous solution.
- a “non-ionic” surfactant refers to a surfactant having a polar portion that does not ionize in aqueous solution.
- a surfactant refers to a molecule that is effective to reduce a surface or an interfacial tension between a first substance dispersed in a second substance such that the first substance is solvated and any molecular groups of the first substance are dispersed.
- a hydrodynamic diameter of the first substance increases after addition of the surfactant.
- the surfactant composition 16 is believed to be effective to reduce the size or diameter of the surfactant micelles 22 in the first aqueous composition 14 , to thereby reduce the size of the nanocapsule 36 when practicing the present invention.
- the surfactant composition 16 may include the surfactant component only (not shown), or may optionally include the biocompatible oil component 18 .
- the surfactant component may be characterized on the HLB scale that ranges from less than about 1 to more than about 13 units.
- a surfactant component having an HLB value of less than about 6.0 units may be described as being poorly, or not dispersable in an aqueous or water-based composition.
- a surfactant component having an HLB value of less than about 6.0 units may be characterized as a hydrophobic or non-ionic surfactant.
- a surfactant component having an HLB value of more than about 7.0 units may be described as being capable of forming a milky to translucent to clear dispersion when the surfactant having an HLB value of more than about 7.0 units is dispersed in an aqueous or water-based composition.
- the surfactant component of the surfactant composition 16 has an HLB value of less than about 6.0 units when practicing the method of the present invention. Still more preferably the surfactant component of the surfactant composition 16 has an HLB value of less than about 5.0 units to facilitate preparation of nanocapsules having a diameter of less than about 50 nm.
- the surfactant component may also be characterized in terms of a critical micelle concentration (CMC) value.
- CMC critical micelle concentration
- the surfactant component of the surfactant composition 16 has a CMC value of less than about 300 micromolars ( ⁇ m). Still more preferably, the surfactant component has a CMC value of less than about 200 ⁇ m.
- the surfactant component of the surfactant composition 16 adsorbs onto the surface of the bioactive component 12 when introduced into the first aqueous composition 14 to minimize exposure of a surface of the hydrophobic surfactant component to a thermodynamically unfavorable environment created by the first aqueous composition 14 . Therefore, the surfactant component adsorbs onto the surface of the bioactive component to reduce the surface area of the surfactant component that may be exposed to the first aqueous composition 14 . Adsorption of the surfactant component onto the bioactive component 12 is believed to facilitate the size reduction of the bioactive component 12 and/or the surfactant micelle 22 .
- the surfactant component of the surfactant composition 16 may be supplied as individual surfactants or supplied in various prepared mixtures of two or more surfactants that are subsequently combined to form the surfactant composition 16.
- suitable surfactants having an HLB value of less than about 6.0 units or a CMC value of less than about 200 ⁇ m be listed in Dermatological Formulations (Barry, B., Marcel Dekker, (1983)), or in Percutaneous absorption: drug, cosmetics, mechanisms, methodology, 3 rd ed., Bronough, R. ed., 1999, or the Handbook of Industrial Surfactants (Ash, M., Ed., Gower Pub. (1993), which are incorporated herein by reference.
- the surfactant component maybe 2, 4, 7, 9-tetramethyl-5-decyn-4, 7-diol(TM-diol), blends of 2, 4, 7, 9-tetramethyl-5-decyn-4, 7-diol(TM-diol), molecules having one or more acetylenic diol groups, cetyl alcohol or any combination of any of these.
- the optional biocompatible oil component 18 of the surfactant composition 16 may be combined with the surfactant component as a liquid, vapor or in granular form.
- the form of the optional biocompatible oil component 18 that is selected preferably permits the optional biocompatible oil component 18 to (1) remain stable prior to introduction into the surfactant composition 16 , (2) be homogeneously blended into the surfactant composition 16 , (3) dissolve or disperse the surfactant component, and (4) increase the hydrophobicity of the surfactant composition 16 , and therefore, the degree to which the size of the bioactive component 12 , the surfactant micelle 22 , the stabilizer surfactant micelle 28 , or the nanocapsule 36 may be reduced when practicing the present invention.
- the concentration of the optional biocompatible oil component 18 in the surfactant composition 16 ranges from about 10 ⁇ 7 weight percent to about 10 weight percent, based upon a total volume of the stabilized surfactant micelles 28 in the first aqueous composition 14 .
- Concentrations of the optional biocompatible oil component 18 higher than about 10 weight percent, based upon the total volume of the surfactant composition 18 may be less desirable because such higher concentrations increase a phase volume of the biocompatible oil, and consequently may cause difficulties in preparing, dispersing and/or handling the surfactant micelles 22 , the stabilized surfactant micelles 28 or the nanocapsules 36 .
- Concentrations of the optional biocompatible oil component lower than about 10 ⁇ 7 weight percent in the surfactant composition 16 may be less preferred, because such lower concentrations would not be effective to solvate the surfactant component, or increase the hydrophobicity of the surfactant composition 16 , and may ultimately increase the diameter of the nanocapsules 36 .
- the optional biocompatible oil component 18 of the surfactant composition 16 may be supplied as an individual biocompatible oil or supplied in various prepared mixtures of two or more biocompatible oils that are subsequently combined to form the optional biocompatible oil component 18 .
- suitable biocompatible oils that may be included as part of the biocompatible oil component 18 may be found in Dermatological Formulations (Barry, B., Marcel Dekker, (1983)), or in Percutaneous absorption: drug, cosmetics, mechanisms, methodology, 3 rd ed., Bronough, R. ed. , 1999, or in the Handbook of Industrial Surfactants (Ash, M., Ed., Gower Pub. (1993), which have been incorporated herein by reference.
- food or USP grade oils such as DMSO, DMF, castor oil, or any combination thereof, are used to practice the present method.
- the surfactant composition 16 may be included at an amount that is effective to form the micellar structure that partitions the bioactive component 12 , the first aqueous composition 14 or the hydrophilic composition into the core of the micellar structure when forming the surfactant micelle 22 . Still more preferably, the surfactant composition 16 is included at an amount that is effective to provide a maximum thermodynamic driving force that minimizes the size of the bioactive component 12 , the surfactant micelle 22 , and ultimately, the size of the nanocapsule 36 when practicing the present invention.
- the amount of the surfactant composition 16 may be varied based upon the bioactive component 12 , the first aqueous composition 14 , a ratio of the surfactant component to the optional biocompatible oil 18 , any desired characteristics of the surfactant micelles 22 , the stabilized surfactant micelles 28 or the nanocapsules 36 .
- a surfactant composition containing a surfactant component having an HLB value of about 6.0 units mixed with a nonpolar biocompatible oil like castor oil may provide the same degree of a thermodynamic driving force as a second surfactant composition containing a surfactant component of about 4.0 units mixed with DMSO.
- the amount of the surfactant composition 16 may range up to about 0.5 weight percent, based upon a total volume of the stabilized surfactant micelles dispersed in the first aqueous composition 14 . Still more preferably, the amount of the surfactant composition 16 is less than about 0.25 weight percent, based upon the total volume of the stabilized surfactant micelles 28 dispersed in the first aqueous composition 14 . Most preferably, the surfactant composition 16 is present at an amount of less than about 0.05 weight percent, based upon the total volume of the stabilized surfactant micelles 28 dispersed in the first aqueous composition 14 .
- the surfactant composition 16 may be added to the total volume of the hydrophilic composition at a concentration of about 500 ppm, based on the total volume of the stabilized surfactant micelles 28 in the first aqueous composition 14 .
- the first dispersing apparatus 20 initiates and promotes formation of the micellar structures that are based on the bioactive component 12 , the first aqueous composition 14 and the surfactant composition 16 .
- Adsorption of surfactant component onto the surface of the bioactive component 12 , or hydrophilic composition continues until all of the surfactant molecules cover, and therefore, entrap the bioactive component 12 or hydrophilic composition in the core of the micellar structure to form surfactant micelles 22 .
- Formation of a plurality of surfactant micelles 22 in the first aqueous composition 14 forms a dispersion of surfactant micelles 22 .
- any conventional dispersing apparatus 20 that is capable of homogenously blending or dispersing may be suitable for use in forming the dispersion of surfactant micelles in accordance with the present invention.
- the first dispersing apparatus 20 may vary depending upon the desired characteristics of the nanocapsules 36 .
- the first dispersing apparatus 20 may include any device, such as a sonicating or a vortexing apparatus (not shown), or the like to disperse the bioactive component 12 in the hydrophilic composition, and the formation of the surfactant micelles 22 after addition of the surfactant composition 16 .
- the first dispersing apparatus 20 may include a sonicating or a vortexing apparatus, the sonicating or the vortexing apparatus is not critical when practicing the method of the present invention.
- a “surfactant micelle” may be characterized as a close packed mono-molecular barrier of surfactant molecules at an interface between the bioactive composition 12 and the surfactant composition 16 , such that the barrier encapsulates the bioactive component 12 , the first aqueous composition 14 or the hydrophilic composition. It is also to be understood that the term “surfactant micelle” encompasses partial or hemi-surfactant micelles that partially enclose the bioactive component 12 , the first aqueous composition 14 or the hydrophilic composition.
- the bioactive component 12 is a hydrophilic bioactive component
- the polar portion of the surfactant molecule associates with a surface of the hydrophilic bioactive component.
- the bioactive component 12 is a hydrophobic bioactive component
- the hydrocarbon portion of the surfactant micelle associates with a surface of the hydrophobic bioactive component.
- surfactant micelle typically occurs at a well defined concentration known as the critical micelle concentration.
- surfactant components having a CMC value of less than about 200 micromolars are preferred when practicing the present invention.
- the dispersion of surfactant micelles 22 is transferred into the stabilizing apparatus 26 where a biocompatible polymer component 24 is added to stabilize the dispersion of surfactant micelles 22 .
- the biocompatible polymer component 24 may be added to the dispersion of surfactant micelles 22 in the first dispersing apparatus 20 which obviates the need for the stabilizing apparatus 26 .
- the biocompatible polymer component 24 stabilizes the dispersion of surfactant micelles 22 to form stabilized surfactant micelles 28 within the first aqueous composition 14 . Therefore, a dispersion of stabilized surfactant micelles 28 are present within the first aqueous composition 14 after addition of the biocompatible polymer component 24 .
- biocompatible refers to a material that is capable of interacting with a biological system without causing cytotoxicity, undesired protein or nucleic acid modification or activation of an immune response.
- the biocompatible polymer component 24 may be introduced into the dispersion of surfactant micelles 22 as a liquid, vapor or in granular form.
- the form of the biocompatible polymer component 24 that is selected preferably permits the biocompatible polymer component 24 to (1) remain stable prior to addition into the dispersion of surfactant micelles 22 , (2) be homogeneously dispersed into the dispersion of surfactant micelles 22 , (3) increase a viscosity of the first aqueous composition 14 , (4) form a boundary layer at an interface of the surfactant micelle 22 and the first aqueous composition 14 , (5) be absorbed onto a surface of the surfactant micelles 22 , (6) be capable of iontophoretic exchange, (7) be capable of being precipitated upon addition of a solute, (8) be capable of enzymatic degradation, surface and/or bulk erosion, (9) not interfere with or mask the functional activity of the bioactive component 12 , (10) prevent aggregation and/or agglomeration of
- the biocompatible polymer component 24 may be included at an amount that is effective to coat and therefore stabilize the surfactant micelle 22 .
- the amount of the biocompatible polymer component 24 used to stabilize the surfactant micelles 22 may vary depending upon the bioactive component 12 , the first aqueous composition 14 , the surfactant composition 16 , the temperature, pH, osmolarity, presence of any optional solutes or optional solvents, the surfactant micelle 22 , any desired characteristics of the stabilized surfactant micelle 28 , the nanocapsules 36 , or a desired dissolution profile.
- the concentration of the biocompatible polymer component 24 is not critical to the present invention, the concentration of the biocompatible polymer component 24 is preferably based upon the bioactive component and on the desired dissolution profile.
- the concentration of the biocompatible polymer component 24 is to high, the shell of the nanocapsule 36 may not dissolve. If the concentration of the biocompatible polymer component 24 is to low, the shell of the nanocapsule 36 may dissolve rapidly in a manner that promotes cytotoxicity, for example. In addition, too low a concentration of the biopolymer component 24 may not provide an effective degree of mechanical force to stabilize the surfactant micelles 28 .
- Concentrations of the biocompatible polymer component 24 that are to high may also be less desirable because such higher concentrations may increase the viscosity of the first aqueous composition 14 , and consequently may cause difficulties in preparing, mixing and/or transferring the stabilizer surfactant micelles 28 .
- Concentrations of the biocompatible polymer component 24 that are to low may be less preferred, because lower concentrations may not provide the needed viscosity to stabilize the surfactant micelles, nor be capable of effectively coating the surfactant micelles 22 to prevent aggregation of the surfactant micelles 22 in the first aqueous composition 14 .
- the biocompatible polymer component 24 may be supplied as individual biocompatible polymers or supplied in various prepared mixtures of two or more biocompatible polymers that are subsequently combined to form the biocompatible polymer component 18 .
- biocompatible polymers include polyamides, polycarbonates, polyalkylenes, polyalkylene glycols, polyalkylene oxides, polyalkylene terepthalates, polyvinyl alcohols, polyvinyl ethers, polyvinyl esters, polyvinyl halides, polyvinylpyrrolidone, polyglycolides, polysiloxanes, polyurethanes and copolymers thereof, alkyl cellulose, hydroxyalkyl celluloses, cellulose ethers, cellulose esters, nitro celluloses, polymers of acrylic and methacrylic esters, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxy-propyl methyl cellulose, hydroxybutyl methyl cellulose,
- biocompatible polymers that have been modified for enzymatic degradation, or change upon application of light, ultrasonic energy, radiation, a change in temperature, pH, osmolarity, solute or solvent concentration may also be included as part of the biocompatible polymer component 24 .
- the biocompatible polymer component 24 is a hydrophilic polymer that is capable of substantially coating, and preferably continuously coating the surfactant micelle 22 .
- the hydrophilic biocompatible polymer component 24 is capable of ionotophoretic exchange.
- hydrophilic biocompatible polymer component 24 any other biocompatible polymer, such as hydrophobic biocompatible polymers may be substituted in place of the hydrophilic biocompatible polymer, in accordance with the present invention, while still realizing benefits of the present invention.
- any combination of any biocompatible polymer may be included in accordance with the present invention, while still realizing benefits of the present invention.
- any conventional apparatus and technique that is suitable for permitting the biocompatible polymer component 24 to stabilize the surfactant micelles 22 may be used as the stabilizing apparatus 26 in accordance with the present invention.
- any other device, such as high pressure homogenization or high ultrasound sonication is preferably not included during stabilization.
- the stabilized surfactant micelles 28 may be transferred into a second aqueous composition 30 located in a second dispersing apparatus 32 .
- the stabilized surfactant micelles 28 may be transferred by mechanically forming droplets of the stabilized surfactant micelle 28 that are subsequently introduced into the second aqueous composition 30 .
- the second aqueous composition 30 may include water only, or may optionally include a solute to precipitate the biocompatible polymer component 24 surrounding the stabilized surfactant micelle 28 .
- solutes include ionic species derived from elements listed in the periodic table.
- the second aqueous composition 30 includes a solute in an amount that is effective to precipitate the biocompatible polymer component 24 and form the dispersed, and optionally atomized nanocapsules 36 of the present invention.
- a solute refers to a solidifying or a hardening of the biocompatible polymer component 24 that surrounds the stabilized surfactant micelles 28 . It is also to be understood that the term “precipitation” is also meant to encompass any crystallization of the biocompatible polymer 24 that may occur when the biocompatible polymer component 24 is exposed to the solute.
- any other component that is capable of modulating the efficacy the nanocapsules 36 may be included as part of the second aqueous composition to thereby modulate the functional activity of the nanocapsule 36 .
- the second aqueous composition may include additional coating excipients, such as a cell recognition component or various ionic species, such as Mn 2+ , Mg 2+ , Ca 2+ , Al 3+ , Be 2+ , Li 30 , Ba 2+ , Gd 3+ , or any other ionic species that is capable of interacting with the biocompatible polymer component 24.
- cell recognition component refers to a molecule capable of recognizing a component on a surface of a targeted cell.
- Cell recognition components may include an antibody to a cell surface antigen, a ligand for a cell surface receptor, such as cell surface receptors involved in receptor-mediated endocytosis, peptide hormones, and the like.
- a flocculated suspension refers to the formation of a loose aggregation of discrete particles held together in a network-like structure either by physical absorption of bioactive components, bridging during chemical interaction (precipitation), or when longer range van der Waals forces of attraction exceed shorter range forces of repulsion.
- the flocculated suspension of nanocapsules 36 may entrap varying amounts of the first aqueous composition 14 or the second aqueous composition 30 within the network-like structure. Additionally, the flocculated suspension of nanocapsules may be gently tapped to disperse the nanocapsules 36 .
- the stabilized surfactant micelles 28 may be transferred into the second aqueous composition 30 via atomization through a nozzle (not shown) having a particular orifice size or through an aerosolizing apparatus (not shown).
- Atomizing or aerosolizing the stabilized surfactant micelles 28 typically includes the application of a shear force that may be capable of further dispersing the stabilized surfactant micelles 28 .
- the application of the shear force during transfer may also be effective to (1) reduce the size of the nanocapsules 36 , or (2) break up any agglomerates or associations between stabilized surfactant micelles 28 that may have formed in the stabilizing apparatus 26 .
- Nozzle pressures of less than about 100 psi, for example, may be used to atomize the stabilized surfactant micelles 28 .
- the diameter of the nanocapsules 36 may also be varied depending upon the orifice size of the nozzle that may be used to transfer the stabilized surfactant micelles 28 into the second aqueous composition.
- the stabilized surfactant micelles 28 may be added to the second aqueous composition 30 containing the solute that precipitates the biocompatible polymer 24 to form a dispersion of nanocapsules 36 for purposes of providing the dispersion for sub-cutaneous delivery of the nanocapsules, for example.
- the nanocapsules 36 may be filtered, centrifuged or dried to obtain separate and discrete nanocapsules 36 .
- the nanocapsules 36 may be frozen or reconstituted for later use or may be delivered to a target cell or tissue by such routes of administration as oral, intravenous, subcutaneous, intraperitoneal, intrathecal, intramuscular, inhalational, topical, transdermal, suppository (rectal), pessary (vaginal), intra urethral, intraportal, intrahepatic, intra-arterial, intra-ocular, transtympanic, intraumoral, intrathecal, or any combination of any of these.
- nanocapsules 36 having a diameter of less than about 50 nm are advantageous in the delivery of bioactive components to target cells for several reasons.
- nanocapsules 36 having a diameter of less than about 50 nm enhances delivery of bioactive components by protecting the bioactive components against degradation during transport to the target cell.
- nanocapsules 36 having a diameter of less than about 50 nm promotes efficient cellular uptake. Efficient cellular uptake into the target cell typically occurs when a particle has a diameter of less than about 50 nm, as opposed to when a particle has a diameter of more than about 50 nm.
- the nanocapsules 36 have a biocompatible polymer shell that is separate from the bioactive component.
- the bioactive component is not entangled in, embedded in, or adsorbed onto the biocompatible polymer shell of the nanocapsules 36 .
- the cell that incorporate the nanocapsules 36 avoid apoptosis or cell death.
- enclosing the bioactive component within a core surrounded by the biocompatible polymer shell when preparing the nanocapsules 36 in accordance with the present method is advantageous in avoiding premature degradation of the nanocapsules 36 , or a cytotoxic response during in vivo transport of the nanocapsule. Enclosing the bioactive component within the core results in a linear release rate of the bioactive component without any zero burst phenomenon during release from the nanocapsules 36 .
- the linear release rate of the bioactive component from the nanocapsule without any zero burst phenomenon is also an advantageous feature as the linear release rate allows rational design of coating dissolution profiles to minimize cytotoxicity.
- dissolution profile refers to a rate at which the biocompatible polymer shell is dissolved or degraded to release a bioactive agent from a core of a nanocapsule.
- Another benefit of the nanocapsules 36 prepared by the method of the present invention is that little, if any, addition of an organic solvent is required to form the nanocapsules 36 . Eliminating the use of most, if not all, organic solvents from the method of the present invention is beneficial since organic solvents may damage the bioactive component 12 , destroy the target cells, or be toxic during preparation of the nanocapsule 36 . The elimination of most, if not all, use of organic solvents eliminates the need for complex solvent removal techniques, such as solvent dilution, vacuum evaporation, or the like, and obviates any associated costs or complex process strategies during preparation of the nanocapsules 36 .
- the nanocapsules 36 of the present invention further permits stable encapsulation of a bioactive component, and in particular, hydrophilic bioactive components, such as polynucleotides and polypeptides.
- “Stable encapsulation”, as used herein, refers to maintenance of the encapsulated bioactive component's structure. For nucleic acids, the appearance of low molecular weight nucleic acid breakdown products, which may be assayed for by electrophoresis, is substantially eliminated.
- the nanocapsules 36 may also be used to encapsulate any bioactive component regardless of water solubility or charge density.
- the nanocapsules 36 may be combined with additional polymeric binders, surfactants, fillers, and other excipients to incorporate the nanocapsules 36 into solid dosage forms such as granules, tablets, pellets, films or coatings for use in enhanced bioactive component 12 delivery. In this way, design of the dissolution profile, control of the particle size, and cellular uptake remains at the level of the nanocapsule.
- Such applications include, but are not limited to, creation of rapidly dissolving nanocapsule pellets for pulmonary delivery or nanocapsule films for device-mediated delivery.
- the nanocapsules 36 may be designed for specific cellular or tissue uptake by polymer selection and/or inclusion of cell-recognition components in the nanocapsule biocompatible polymer shell or coating.
- Such coatings will have utility for specific or increased delivery of the bioactive agent to the target cell.
- Such applications include, but are not limited to tumor-targeting of chemotherapeutic agents or anti-sense DNA, antigen delivery to antigen-presenting cells, ocular delivery of ribozymes to retinal cells, transdermal delivery of protein antibodies, or transtympanic membrane delivery of peptide nucleic acids.
- FIG. 1A Samples were prepared on freshly cleaved mica as dispensed, dried in air and imaged using a Nanoscope II multimode AFM (Digital Instruments) with a J type scanner and ambient tapping mode holder. 125 ⁇ m long silicon cantilevers type IBMSC were from IBM and have resonant frequencies of 250-450 kHz. All imaging was in tapping mode, images were 512 ⁇ 512 pixels and scanning frequency was 1 kHz. Height, amplitude and phase images were collected. Images were processed in DI software and analyzed in NIH Image SXM.
- Nanoscope II multimode AFM Digital Instruments
- IBMSC 125 ⁇ m long silicon cantilevers type IBMSC were from IBM and have resonant frequencies of 250-450 kHz. All imaging was in tapping mode, images were 512 ⁇ 512 pixels and scanning frequency was 1 kHz. Height, amplitude and phase images were collected. Images were processed in DI software and analyzed in NIH Image SXM.
- A Formula Q from 2-phase system, low HLB surfactant
- B Formula S from 2-phase system, high HLB surfactant
- C Formula T from 1-phase system, high HLB surfactant
- D Formula V from 2-phase system, surfactant below CMC.
- FIG. 1C Nominal 300 ng samples of DNA were aliquoted from a master batch containing surfactant and processed through commercial miniprep columns. Eluate was recycled through Qiaquik columns and collected either 3 times (4, 5) or twice (6,7) or recycled through Zymoclean columns and collected twice (8,9).
- FIG. 2 Endocytic activity was assessed by immunosignal levels of clathrin (Chemicon). Potocytotic activity was assessed by immunosignal for caveolin-1 as described in the literature (Transduction Laboratories). Lysosomal activity was detected by an monoclonal antibody to Lamp-1 (Transduction Laboratories). Nanocapsule localization was detected by streptavidin-biotin immunocomplexes directed against sheep IgG (Jackson Laboratories). Nanocapsule coatings were spiked with ovine IgG to enable this detection strategy.
- FIG. 3 immortalized Rt-1 fibroblast cultures at 70% confluence were treated for 4 days with increasing amounts of nanocapsule formula K and transiently treated (3 hours) with an optimized liposomal formula (dose, 500 ng) Results are expressed as a percentage of cellular actin integrated intensity and compared to the liposomal formula.
- Expression vector was code 448: pEF/myc-his/GFP (Invitrogen).
- FIG. 4A Radiated porcine biopsies were snapfrozen 7 days after treatment with saline or 6 ⁇ g of controlled release nanocapsules, then homogenized in RIPA. 100 ⁇ g lysate samples were electrophoresed on SDS-Page gradient gels, transferred to nitocellulose membranes and detected for either ⁇ -galactosidase (121 Kd) or involucrin ( ⁇ 100 kD) using chemiluminescence. Results were normalized to the post-transfer gel stained with Coomassie due to interference at 100 kD from a gel defect.
- a component of the cornified membrane, manufactured by suprabasal cells can be detected in radiated porcine skin and will be used for future normalization purposes.
- FIG. 4B The ⁇ -galactosidase reporter protein was detected by a monoclonal antibody directed at an incorporated fusion protein tag.
- FIG. 5 Nanocapsules were incorporated into an aqueous suture coating and sutures were applied to pigskin biopsies in organ culture. Nanocapsules were detected with Cy3 conjugated-streptavidin-biotin complexes to incorporated ovine IgG and GFP transgene expression was detected by rabbit polyclonal antibodies to GFP (Abcom) in combination with Fitc-conjugated polyclonal antibodies to rabbit IgG and Alexa 488-conjugated polyclonal antibodies to Fitc (Molecular Probes). Controls omitting primary antibodies were included for signal-to-background level estimation.
- FIG. 6A Nanocapsules were detected as previously described and GFP transgene expression was detected by rabbit polyclonal antibodies to GFP in combination with Cy3-conjugated antibodies to rabbit IgG (Jackson Laboratories).
- FIG. 6B GFP expression was detected as described in FIG. 5 and cell nuclei were counterstained with 10 ⁇ g/ml bisbenzamide.
- FIG. 6C Carcinoma cells and HDF's were seeded overnight into 96 well plates at 2000 and 6000 cells per well respectively. Cisplatin preparations were added to wells for 18 hours as noted on the graph than washed out. After 72 hours cell viability of assessed by a commercial MTT assay (WST assay, Boehringer Mannheim). Wells were executed in duplicate.
- WST assay Boehringer Mannheim
- FIG. 7 Colocalization with lysosomes was detected using a monoclonal antibody to Lamp-1 (Transduction Laboratories). AFM images are included of O-methyl RNA formulated by nanoencapsulation or complexation with 27 KD polyethyleneimine.
- PEI Poly(ethylenimine) at 27 KiloDalton (kD). PEI was used at optimized conditions (90% charge neutralization)
- PLL Polylysine at 70-150,000 molecular weight.
- PLL condensing materials were conjugated with nuclear signal localization peptides, either SV-40 T antigen or cys-gly-tyr-gly-pro-lys-lys-lys-arg-lys-val-gly-gly using carboxiimide chemistry available from Pierce Chemical (Rockford, Ill.).
- NMP nuclear matrix proteins
- Hyaluronan derived from human umbilical cord, about 4MMKD and not conjugated.
- Povidone polyvinylpyrolidone, PVP
- Povidone 10,000 kD MW and not bioconjugated
- Povidone polyvinylpyrolidone, PVP
- Kd polyvinylpyrolidone
- PVP polyvinylpyrolidone
- 334 pcDNA/His/LacZ, produces galactosidase, incorporates CMV promoter, based on pcDNA 3.1. (Invitrogen), 8.6 kB
- 425 pEGFP-c/farn, enhanced GFP (green fluorescent protein) expression vector modified with a farnasyl moiety to improve microscopy, CMV promoter, 4.6 kB
- CCRL 1764 Immortalized rat neonatal fibroblast cell line
- HaCaT immortalized human keratinocyte cell line
- Ca9 human tumor cells derived from a squamous cell carcinoma of tongue origin.
- Formulae were produced by i) predispersing 25 ⁇ g of DNA (425) on ice using a bath sonicator, ii) condensing DNA in a small amount of water by vortexing then incubating on ice for 20 minutes, iii) adding surfactant then oil followed by 30 seconds of probe sonication at 10 Watts, iv) diffusion dilution to 3 milliliters (mL) by first adding saline then 1 MM kD hyaluronan polymer (1%) as a protective colloid, v) mechanically shearing emulsion into droplets by pumping through a 250 micrometer ( ⁇ m) orifice into 22 mL of PBS, 10 milliMolar (mM) Ca 2+ , 200 mM Li + , vi) incubating overnight end over end and vii) centrifuging to recover nanoparticles for resuspension
- the condenser-to-DNA weight ratio was determined by dye exclusion at 90% charge neutralization.
- TM-diols were used in this experiment to represent water-immiscible surfactants, while Tergitol NP40 and Tween 80 were used to represent water-soluble and even more water-soluble emulsifiers/dispersing aids.
- Dispersion conditions were systematically varied to discourage micelle formation in aqueous media by i) choosing water-soluble surfactants (Formulae S,T,U, and V), ii) removing the dispersed phase (Formula T) and iii) decreasing surfactant loading below that required for micelle formation.
- Formula U featured use of a water-miscible oil (silicone oil).
- Nanocapsule sizing was determined by tapping mode AFM and images are illustrated in FIG. 1A.
- the data indicate average nanocapsule sizes less than 50 nm are achievable only with multi-phase systems in combination with low water solubility surfactants (Table 1A: Formulae Q,R vs. S,T,U,V, and W).
- Table 1A Formulae Q,R vs. S,T,U,V, and W.
- Effective dispersion also corresponded with decreased aggregation and enhanced DNA stability (as indicated by decreased electrophoretic breakdown products).
- the starting DNA was partially relaxed (76% supercoiled by electrophoresis). Using this value as a basis, supercoil retention in DNA still encapsulated following 100 hrs of release testing, was excellent in multi-phase systems.
- FIG. 1C illustrates that small amounts of DNA (in this case 300 nanograms of DNA) can be recovered accurately in a procedure comprising butanol extraction of 10% butanol/saline releasing fluid followed by isolation on a miniprep column and measurement of absorbance at 260 nm excitation. Results obtained from UV spectroscopy are confirmed by electrophoresis of recovered DNA following alcohol coprecipitation with a commercial coprecipitant aid.
- Experiment 1A demonstrates the importance of a multi-phase system in creating coated particles from the micellar solution, defines surfactant requirements and validates method for measuring in vitro release profiles.
- Aqueous dispersion of DNA condensates with poorly soluble surfactants in the inventive method produced average nanocapsule diameters under 50 nm.
- a 30 number of successful operating regimes were feasible with varying effects on encapsulation yield.
- under condensation resulted in an average particle diameter increase from 20 to 12 nm (Table 1B: F1vs. F2).
- the same decrease in condenser weight ratio induced a particle size increase from 24 to 36 nm, while still maintaining nanocapsule functionality for trangene delivery, when using a TM-diol/DMSO surfactant system for initial micelle formation (Table 1B: F4 vs. F5).
- This finding teaches surfactant selection impacts final average nanocapsule diameters.
- nanocapsules increased cellular pinocytotic activity compared to standard formulations, and smaller nanocapsules shifted pinocytotic activity to caveolae from clathrin-coated pits (Table 2: Formula O vs. pei-dna and lipoplex pDNA). It was further observed that nanocapsules avoided lysosome co-localization at 10 hours post-addition with smaller nanocapsules being particularly effective (see Table 2: Formula vs. pei-dna and lipoplex pDNA). These results are illustrated further in FIG. 2. This improvement is further emphasized by comparison with published uptake studies for HacaT keratinocytes.
- nanocapsule design plays a role in maintaining nanocapsule integrity and that size effects and dissolution profiles can contribute to observed cytotoxicity and functionality.
- application of nanocapsule formulations increased dosing to useful efficiency levels without induction of an apoptotic program.
- Table 3B exemplifies this improvement with a dose response of Formula K.35 measured in fibroblast lysates.
- GFP production was measured in fibroblast lysates after 4 days of treatment with increasing doses of nanocapsules.
- a 9.5 ⁇ g dose of nanocapsules equaled the production of a liposomal formulation without any evidence of cytotoxicity.
- Example 4 Nanocapsule delivery of macromolecules to porcine tissue across keratinized barrier epithelia bv transdermal and subcutaneous means
- tissue sections were analyzed for ⁇ -galactosidase expression in double-label experiments using antibodies to cell-specific epitopes (see FIG. 4B).
- Digital image analysis of these sections indicated that radiated keratinocytes and endothelial cells are readily transduced in organ culture 7 days after treatment with a 10 day releasing formula.
- Specific quantitation of fibroblastic cells was not possible without inclusion of a cell-specific marker, however, an 11-fold increase in area of expression was measured in N biopsy dermis (see FIG. 4B).
- Example 5 Integration of inventive nanocapsules into a solid dosage form for additional utility in physical targeting
- Nanocapsules containing a nuclear GFP transgene or empty vector were incorporated into a suture coating by vortexing the following components: i) 50 ⁇ g of nanocapsules containing plasmid DNA, ii) 200 ⁇ g of bovine mucin, and iii) 75 ⁇ g of sucrose (60% w/w) in a 1000 ⁇ l volume. Sutures were aseptically coated by drawing sutures 5 ⁇ through punctured microcentrifuge tubes. Coating functionality for gene transfer was tested by applying sutures in cultured porcine skin biopsies. Biopsies were cultured on a mesh such that the biopsy bottom was in contact with cell culture media. Biopsies were treated for 7 days, then snap-frozen and sectioned for immunofluorescence microscopy to assess nanocapsule penetration and transgene delivery.
- FIG. 5A shows distribution of sheep IgG signal throughout porcine dermal tissue with accumulation on capillaries.
- primary antibody is omitted during slide processing to determine level of background fluorescence.
- a suture is visible in this view.
- Sutures were identifiable as smooth objects without positive nuclear counterstain.
- GFP expression was confirmed using a polyclonal GFP antibody to obviate the effect of nonspecific tissue green fluorescence.
- FIG. 5B shows GFP expression throughout the suture-treated dermis using a GFP polyclonal antibody. A suture was visible 750 microns away.
- FIG. 5C shows the lack of GFP expression in a biopsy treated with empty vector coating. This example demonstrates the usefulness of nanocapsules for use in physically targeted macromolecule delivery.
- Example 6 Ultratility of nanocapsules for local targeting by design of nanocapsule coating
- GFP nanocapsules were prepared by dispersion atomization as described in Example 1.
- Polyvinylpyrylodone (PVP, MW 10,000) was used as the coating basis.
- a coating weight ratio of 1:40 was used and rod-shaped nanocapsules of 23 ⁇ 2 nm were produced.
- 1 ⁇ g of PVP nanocapsules were applied to both human dermal fibroblasts (HDF) and HacaT keratinocyte cultures for 4 hours then fixed for detection for nanocapsule uptake by streptavidin-bioting immunocomplexes to sheep IgG. Nanocapsule coatings are spiked with ovine IgG to enable this detection strategy.
- FIG. 6 illustrates positive nuclear localization of PVP nanocapsules in HDF's and negative colocalization of PVP nanocapsules in keratinocytes (FIG. 6: 6 a vs. 6 b ). Views of untreated cultures are included for comparison ( 6 a ′, 6 b ′). Cultures were also treated with 5 ⁇ g of PVP nanocapsules for 5 days then tested for GFP transgene production. Consistent with uptake studies results, only the fibroblast cultures showed production of GFP transgene (FIG. 6: 6 a ′′ vs. 6 b ′′).
- GFP nanocapsules were prepared by dispersion atomization as described in example 1. Tenascin (TN, MW 200,000) was used as the coating basis. A coating weight ratio of 1:20 was used and spherical nanocapsules of 19 ⁇ 0.9 nm were produced. 500 ng of TN nanocapsules were applied topically in successive small aliquots to pig biopsies maintained in organ culture. Biopsies were rinsed in media after 3 minutes of topical application and culture media was changed to preclude any delivery other than topical.
- FIG. 6B To simulate tumor nests of epithelial-derived origin, biopsies had been seeded 12 hours previously with 50,000 human squamous carcinoma cells. 7 days later biopsies were snapfrozen and sectioned for immunological detection of GFP production.
- view “a” shows intense GFP fluorescence in the tumor center
- view “b” confirms this GFP expression with polyclonal antibodies to GFP
- view “c” shows cell positioning in the section using a counterstain for cell nuclei
- view “d” shows the level of background fluorescence by omission of GFP antibodies.
- Tumor origin was confirmed by positive detection with antibody to keratin 10/1, an epithelial marker.
- Comparison of view “b” and view “c” indicates that GFP expression is limited to cells within the tumor. As already demonstrated in example 5, expression throughout a tissue is also feasible and can modulated by coating design. This example demonstrates that nanocapsule delivery can be productively targeted.
- Nanocapsules were prepared as described in Example 1 to encapsulate cisplatin, a hydrophobic molecule and a common cancer chemotherapeutic with serious side effects. A coating weight ratio of 1:100 was used and irregular nanocapsules of 29 ⁇ 3 nm were produced. Targeting efficacy was demonstrated by changes in the dose response for cell growth inhibition in fibroblast vs. squamous cell carcinoma cultures. Cells were seeded overnight into 96 well plates, treated for 18 hours with increasing amounts of encapsulated or unencapsulated drug, then assessed for cell growth inhibition using an MTT assay 48 hours later for total growth time of 72 hours. Results are illustrated in FIG. 6C.
- TN nanocapsules protected nontarget cells from cell death (zero death) at drug levels that killed using unencapsulated drug (FIG. 6Aa: open vs. closed circles).
- TN nanocapsules productively decreased the inhibition concentration (IC50) an estimated 300% from 525 to 160 ⁇ g/ml.
- Example 6 demonstrates the usefulness of nanocapsules for use in coating-targeted macromolecule delivery.
- Nanocapsules containing either 500 kD Fitc-labelled dextran, 20 mer Fitc-labelled mer O-methylated RNA oligonucleotide and 16 mer phosphodiester DNA oligonucleotide were prepared as described in Example 1. A 1:40 coating weight ratio was used and 1 MM kD hyaluronan was used a coating basis. PEI was used to condense the phosphodiester DNA oligonucleotide, but no PEI was included in the dextran or RNA oligonucleotide formulas. Nanocapsule functionality for drug delivery was tested by evaluating changes in relative pinocytotic activity and cellular uptake in 35 mm cultures of human dermal fibroblast.
- Nanocapsule formulas were compared to naked species or species formulated as complexes. Quantitative results are summarized in Table 7. TABLE 6 Nanoencapsulation improves cellular uptake of other species used as pharmaceutical, nutraceutical, research or cosmetic agents. At 18 hours post-addition, lysosomes are only evident in conventionally formulated species.
- Table 7 shows that average diameters for all nanocapsules were below 50 nm by AFM.
- PEI complexes of DNA oligonucleotides were measured at 67 nm and PEI complexes of uncharged RNA O-methyl oligonucleotides were measured at 236 nm.
- nanocapsules stimulate pinocytotic activity as indicated by increased signal levels of clathrin and caveolin-1. In the 500 kD dextran case, pinocytotic activity shifts productively towards caveolae with nanoencapsulation (Table 7, 500 kD Dextran).
- FIG. 7B That distribution is exclusively nuclear for the nanoencapsules of RNA oligonucelotides (FIG. 7B: a vs. a′). Punctate inclusion are visible in the cultures treated with the complexed RNA oligonucleotides that co-localize with an immunological marker for lysosomes (FIG. 7A: a vs. a′). Particle sizing results from AFM microscopy are included to demonstrate dramatic difference in sizing following encapsulation. (FIG. 7A, 7 B:b vs.b, b′).
- Formulas encapsulating lower molecular weight dextrans and unstabilized RNA were also prepared with analagous uptake, nanocapsule size and yield to demonstrate that encapsulation can provide not only a targeting function but aid in stabilizing molecules sensitive to chemical or enzymatic degradation. These examples demonstrates the usefulness of nanocapsules 36 for use in delivery of a broad range of macromolecules.
Abstract
Description
- This application is a continuation of application Ser. No. 09/796,575 filed Feb. 28, 2001, which claims the benefit of U.S. Provisional Application No. 60/185,282 filed Feb. 28, 2000.
- The present invention generally relates to a field of controlled-release delivery systems for macromolecules, particularly those for nucleic acids and gene therapy. More specifically, the present invention relates to nanocapsules having a diameter of less than about 50 nanometers, in which a bioactive component is located in a core of the nanocapsule, and to methods of forming these nanocapsules.
- Over the past several decades, active and extensive research into the use of nanoparticles in the delivery of bioactive agents has generated a number approaches in the preparation of nanoparticles. These approaches typically include the use of heat, high pressure homogenization, or high intensity ultrasound sonication to prepare nanoparticles having a diameter of more than 100 nanometers, or high amounts of solvents or oils, cytotoxic chemicals, such as cross-linking agents, adjuvants, catalysts or any combination of any of these, to prepare nanoparticles having a diameter of less than 100 nanometers. Furthermore, these approaches are challenging due to a number of variables.
- For example, when organic solvents are included in the manufacturing process for nanoparticles, the organic solvent may denature the bioactive agent which reduces most, if not all, efficacy of the bioactive agent. In fact, denaturation of the bioactive agent may promote a toxic response upon administration of the nanoparticle, to a human subject, for example.
- In addition, when an organic solvent is used to prepare nanoparticles, the organic solvent may undergo degradation to form a low pH environment that destroys the efficacy of the bioactive agent. Therefore, organic
- As a result, organic solvents are typically removed during the manufacturing process of nanoparticles. However, inclusion of one or more organic solvent removal techniques generally increases the costs and complexity of forming nanoparticles.
- The incorporation of high pressure homogenization or high intensity ultrasound sonication to prepare nanoparticles typically results in entangling or embedding the bioactive agent in a polymeric matrix of the nanoparticle. Entangling or embedding the bioactive agent in the polymeric matrix may also denature the bioactive agent to thereby reduce the efficacy of the bioactive agent.
- Entangling or embedding the bioactive agent in the polymeric matrix of the nanoparticle may also reduce the efficacy of the bioactive agent by permitting premature release of the bioactive agent prior to reaching a target cell. Premature release of the bioactive agent typically promotes cytotoxicity or cell death during administration of the nanoparticle.
- Furthermore, nanoparticles that reach the target cell are typically transported into the target cell via endosomal regulated pathways that results in lysosomal degradation of the bioactive agent and the nanoparticle. Therefore, functional activity of the bioactive agent inside the target cell may not occur since the bioactive agent and the nanoparticle undergoes degradation. As used herein, the term “functional activity” refers to an ability of a bioactive agent to function within a target cell for purposes of providing a therapeutic effect on the target cell.
- Additionally, high pressure homogenization or high intensity ultrasound sonication techniques often require complex and expensive equipment that generally increases costs in preparing nanoparticles. Therefore, an urgent need exists to prepare nanoparticles without the use of cytotoxic chemicals like organic solvents or the use of complex and expensive equipment. Furthermore, an urgent need exists to prepare nanoparticles that do not entangle nor embed the bioactive agent in the nanoparticle so that cytotoxic responses are minimized. Additionally, an urgent need exists to develop a nanoparticle that maybe transported into a target cell where the bioactive agent is released to accomplish therapeutic delivery of the bioactive agent.
- The present invention generally relates to nanocapsules and methods of preparing these nanocapsules. The present invention includes a method of forming a surfactant micelle and dispersing the surfactant micelle into an aqueous composition having a hydrophilic polymer to form a stabilized dispersion of surfactant micelles. The method further includes mechanically forming droplets of the stabilized dispersion of surfactant micelles, precipitating the hydrophilic polymer to form precipitated nanocapsules, incubating the nanocapsules to reduce a diameter of the nanocapsules, and filtering or centrifuging the nanocapsules.
- FIG. 1 is a schematic of a method of the present invention for preparing nanocapsules.
- FIG. 1A illustrates atomic force microscopy of nanocapsule formulations prepared under different dispersion conditions.
- FIG. 1B illustrates results from an experiment documenting quantitative recovery of small amounts of DNA from releasing solutions.
- FIG. 1C illustrates cumulative release over 72 hours for nanocapsules prepared under different dispersion conditions.
- FIG. 2 illustrates relative pinocytotic activity of HacaT keratinocyte cultures treated with DNA complexes, nanocapsules containing DNA or no treatment.
- FIG. 3 illustrates the results of western blotting of total protein from rat fibroblast cultures.
- FIG. 4A illustrates
- FIG. 4B illustrates immunofluorescence microscopy of porcine dermal tissue sections from the experiment of FIG. 4.
- FIG. 5 shows incorporation of nanocapsules into a solid dosage form.
- FIG. 6A illustrates polyvinylpyrolidone nanocapsule uptake and Green Fluorescent Protein (GFP) expression in 35 mm human dermal fibroblast and immortalized keratinocyte cultures.
- FIG. 6B illustrates tumor targeting of GFP plasmid DNA by Tenascin nanocapsules.
- FIG. 6C illustrates an effect of nanocapsules that are coated with Tenascin and nanocapsules that are not coated with Tenascin on growth inhibition of squamous cell carcinoma and human dermal fibroblast (HDF) cultures.
- FIG. 7 shows uptake of HDF cultures treated with nanocapsules containing 20 mer Fitc-labeled O-methyl RNA oligonucleotides.
- The present invention generally relates to nanocapsules having a diameter of less than about 50 nanometers (nm). The present invention also relates to a method of preparing these nanocapsules. According to the method of the present invention, a nanocapsule is formed by partitioning a bioactive component within a core of surfactant molecules, and surrounding the surfactant molecules with a biocompatible polymer shell.
- A method for producing the nanocapsule is generally depicted at10 in FIG. 1. In the
method 10, abioactive component 12 is homogeneously dispersed into a firstaqueous composition 14 to form a hydrophilic composition (not shown). Next, a surfactant composition 16, including a surfactant component (not shown) that contains a plurality of surfactant molecules, and an optionalbiocompatible oil component 18, are introduced into afirst dispersing apparatus 20 along with the hydrophilic composition. The surfactant composition 16 is subjected to conditions in the first dispersingapparatus 20 that initiate at least partial adsorption of the surfactant molecules onto a surface of thebioactive component 12. - Partial adsorption of surfactant molecules onto the surface of the
bioactive component 12 initiates partitioning of thebioactive component 12 into a core of a shell formed from the surfactant molecules in the firstaqueous composition 14. Adsorption of the surfactant molecules onto the surface of thebioactive component 12 may proceed until an entire surface of thebioactive component 12 is covered by the surfactant molecules to complete partitioning of thebioactive component 12 into the core of surfactant molecules and form asurfactant micelle 22. - Next, a
biocompatible polymer component 24 is added to thesurfactant micelle 22 to stabilize thesurfactant micelle 22 located in the firstaqueous composition 14. Preferably, thebiocompatible polymer component 24 surrounds thesurfactant micelle 22 in a stabilizingapparatus 26 to form a stabilizedsurfactant micelle 28. - After stabilization, the stabilized
surfactant micelle 28 is transferred from the stabilizingapparatus 26 into a secondaqueous composition 30 located in a second dispersingapparatus 32. Preferably, the secondaqueous composition 30 includes a solute (not shown) that is capable of precipitating thebiocompatible polymer component 24 that coats the stabilizedsurfactant micelle 28. After precipitating thebiocompatible polymer component 24 of the stabilizedsurfactant micelle 28, dispersed, optionally atomized precipitatednanocapsules 36, hereinafter referred to asnanocapsules 36, are formed. - It has been discovered that dispersing a surfactant composition, that includes a surfactant component having a hydrophile-lipophile-balance (HLB) value of less than about 6.0 units, into an aqueous composition that contains a bioactive component forms surfactant micelles that surround the bioactive component. It has further been discovered that stabilizing the surfactant micelles by adding a biocompatible polymer coats the surfactant micelles to form nanocapsules having a diameter of less than about 50 nm.
- As used herein, the term “nanoparticle” refers a particle having a matrix-type structure with a size of less than about 1,000 nanometers. When the nanoparticle includes a bioactive component, the bioactive component is entangled or embedded in the matrix-type structure of the nanoparticle.
- The term “nanosphere”, as used herein, refers to a particle having a solid spherical-type structure with a size of less than about 1,000 nanometers. When the nanosphere includes a bioactive component, the bioactive component is adsorbed onto the surface of the nanosphere or embedded in the nanosphere.
- Similarly, the term “nanocore”, as used herein, refers to a particle having a solid core with a size of less than about 1,000 nanometers. When the nanocore includes a bioactive component, the bioactive component is entangled in the nanocore.
- As used herein, the term “nanocapsule” refers to a particle having a hollow core that is surrounded by a shell, such that the particle has a size of less than about 1,000 nanometers. When a nanocapsule includes a bioactive component, the bioactive component is located in the core that is surrounded by the shell of the nanocapsule. The term “nanocapsule” is not meant to encompass, and generally does not include, a particle having a size of less than about 1,000 nanometers, in which a bioactive component is entangled or embedded in the matrix of the nanocapsule or adsorbed onto the surrounding shell of the nanocapsule.
- The
bioactive component 12 may be included into the firstaqueous composition 14 as a liquid, vapor or in granular form. The form of thebioactive component 12 that is selected preferably permits thebioactive component 12 to (1) remain stable prior to dissolving or dispersing into the firstaqueous composition 14, (2) be homogeneously dispersed into the firstaqueous composition 14, (3) be optionally condensed to reduce a size of thebioactive component 12, (4) be partitioned into the core of thesurfactant micelles 22, (5) be released upon degradation of thebiocompatible polymer shell 24 of thenanocapsule 36, and (6) be functionally active upon release from thenanocapsule 36. - The
bioactive component 12 may be characterized as “hydrophilic” or “hydrophobic”. As used herein, the term “hydrophilic” and “hydrophilicity” refers to an ability of a molecule to adsorb water or form one or more hydrogen-bond(s) with water. All references to “hydrophilic” is also understood as encompassing any portion of the molecule that is capable of adsorbing water or forming one or more hydrogen-bond(s) with water. As used herein, the term “hydrophobic” and “hydrophobicity” refers to an ability of a molecule to not adsorb water nor form one or more hydrogen-bond(s) with water. All references to “hydrophobic” is also understood as encompassing any portion of the molecule that is not capable of adsorbing water nor forming one or more hydrogen-bond(s) with water. - When the
bioactive component 12 is a hydrophilic bioactive component, the hydrophilic bioactive component maybe directly added to the firstaqueous composition 14. As an alternative, the hydrophilicbioactive component 12 may be optionally dissolved or dispersed in one or more solvents, such as water, a nonpolar solvent, a polar solvent, or any combination of any of these. - As used herein, the term “nonpolar solvent” refers to a solvent that does not have a permanent electric dipole moment, and therefore has no ability for an intramolecular association with a polar solvent. Additionally, a nonpolar solvent may be characterized as a solvent that includes molecules having a dielectric constant of less than about 20 units. Similarly, the term “immiscible”, as used herein, refers to an inability of two or more substances, such as two or more liquids, solids, vapors, or any combination of any of these, to form an intramolecular association with another substance. Some non-exhaustive examples of nonpolar solvents may be found in Perry's Chemical Engineer's Handbook, Sixth Edition, which is incorporated herein by reference.
- As used herein, the term “polar solvent” refers to a solvent that has a permanent electrical dipole moment, and therefore has an ability to form an intramolecular association with another polar substance, such as a liquid, a solid, a vapor or any combination of any of these. Additionally, a polar solvent may be characterized as a solvent that includes molecules having a dielectric constant of more than about 20 units. Likewise, the term “miscible”, as used herein, refers to an ability of two or more substances to form an intramolecular association with each other. Some non-exhaustive examples of polar solvents may be found in Perry's Chemical Engineer's Handbook, Sixth Edition, which has been incorporated herein by reference.
- When the
bioactive component 12 is a hydrophobic bioactive component, the hydrophobic bioactive component may be dispersed or dissolved in a solvent that is capable of dispersing or dissolving the hydrophobic molecule, such as the above-mentioned water, a nonpolar solvent, a polar solvent, or any combination of any of these. Preferably, when thebioactive component 12 is a hydrophobicbioactive component 12, the hydrophobicbioactive component 12 is dissolved or dispersed in a water-miscible solvent, such as, acetone, acetonitrile, ethanol, dimethyl acetamide (DMA), tetrahydrofuran (THF), dioxane, dimethylsulfoxide (DMSO), and dimethylformamide (DMF). Other suitable non-exhaustive examples of water-miscible solvents may be found in Perry's Chemical Engineer's Handbook, Sixth Edition, which has been incorporated herein by reference. - As noted, the
bioactive component 12 may be optionally condensed in the firstaqueous composition 14 prior to forming the surfactant micelle 16. For example, when the bioactive component is a polynucleotide, the polynucleotide may be condensed using a DNA-condensing agent. As used herein, a “DNA-Condensing Agent” is a molecule that facilitates condensation or a size reduction of DNA. - While condensation of the
bioactive component 12 is not critical to the present invention, condensation of thebioactive component 12 maybe practiced to reduce the size of thebioactive component 12. Condensation of thebioactive component 12 generally reduces the size of thebioactive component 12 prior to partitioning into the core of the surfactant micelle 16. Reducing the size of thebioactive component 12 may permit maximum incorporation of thebioactive component 12 into thesurfactant micelle 22 or may assist a reduction in the overall size of thenanocapsule 36. Increasing the amount of thebioactive component 12 that may be included as part of the nanocapsule 36 permits incorporation of macromolecules having a large number of monomers, such as a large number of base pairs or amino acids, for example. Some non-exhaustive examples of condensing agents have been reviewed in Rolland, A. P. (1998). Crit. Rev. Therapeutic Drug. Carr. Syst. 15:143-198, and is incorporated herein by reference. - The
bioactive component 12 may further include additional components that are compatible with, and that do not interfere with solvation or dispersion of thebioactive component 12. Some non-exhaustive examples of additional components that may be added to thebioactive component 12 include a DNA-associating moiety, which refers to a molecule, or portions thereof, that interact in a non-covalent fashion with nucleic acids. DNA-associating moieties may include, but are not limited to, a major-and minor-groove binder, a DNA intercalator, a polycation, a DNA-masking component, a membrane-permeabilizing component, a subcellular-localization component, or the like. Major- and minor-groove binders, as used herein, are molecules thought to interact with DNA by associating with the major or minor groove of double-stranded DNA. - Similarly, the term “DNA intercalator”, as used herein, refer to a planar molecule or planar portion of a molecule thought to intercalate into DNA by inserting themselves between, and parallel to, a nucleotide base pair. As used herein, a “polycation” is thought to associate with the negative charges on the DNA backbone. The DNA-associating moiety may be covalently linked through a “reactive group” to a functional component of this invention. The reactive group is easily reacted with a nucleophile on the functional component. Some non-exhaustive examples of reactive groups (with their corresponding reactive nucleophiles) include, but are not limited to N-hydroxysuccinimide (e.g., amine), maleimide and maleimidophenyl (e.g., sulfhydryl), pyridyl disulfide (e.g., sulfhydryl), hydrazide (e.g., carbohydrate), and phenylglyoxal (e.g., arginine).
- The term “DNA-masking component”, as used herein, refers to a molecule capable of masking all or part of a polynucleotide following release from a nanocapsule to increase its circulatory half-life by inhibiting attack by degrading reagents, such as nucleases, present in the circulation and/or interfering with uptake by the reticuloendothelial system. Similarly, the term “membrane-permeabilizing component”, as used herein, refers to any component that aids in the passage of a polynucleotide or encapsulated polynucleotide across a membrane. Therefore, “membrane permeabilizing component” encompasses in part a charge-neutralizing component, usually a polycation, that neutralizes the large negative charge on a polynucleotide, and enables the polynucleotide to traverse the hydrophobic interior of a membrane.
- Many charge-neutralizing components can act as membrane-permeabilizers. Membrane-permeabilization may also arise from amphipathic molecules. A “membrane permeabilizer”, as used herein, is a molecule that can assist a normally impermeable molecule to traverse a cellular membrane and gain entrance to the cytoplasm of the cell. The membrane permeabilizer may be a peptide, bile salt, glycolipid, phospholipid or detergent molecule. Membrane permeabilizers often have amphipathic properties such that one portion is hydrophobic and another is hydrophilic, permitting them to interact with membranes.
- The term “subcellular-localization component”, as used herein, refers to a molecule capable of recognizing a subcellular component in a targeted cell. Recognized subcellular components include the nucleus, ribosomes, mitochondria, and chloroplasts. Particular subcellular-localization components include the “nuclear-localization components” that aid in carrying molecules into the nucleus and are known to include the nuclear localization peptides and amino acid sequences.
- The
bioactive component 12 may be included at an amount that is therapeutically effective to transform a plurality of cells, such as in vitro, in vivo or ex vivo cells. As used herein, “transform” refers to a presence and/or functional activity of the bioactive component in the plurality of cells after exposing the nanocapsules to the plurality of cells. - Furthermore, those of ordinary skill in the art will recognize that the amount of the
bioactive component 12 may vary depending upon thebioactive component 12, the temperature, pH, osmolarity, any solutes, any additional component or optional solvents present in the secondaqueous component 30, the surfactant composition 16, a type or an amount of thesurfactant micelle 22, thebiocompatible polymer component 24, any desired characteristics of the stabilizedsurfactant micelle 28, any desired characteristics of thenanocapsules 36, or any combination of any of these. - The
bioactive component 12 of the nanocapsule 36 maybe supplied as an individual macromolecule or supplied in various prepared mixtures of two or more macromolecules that are subsequently combined to form thebioactive component 12. Some non-exhaustive examples of hydrophilic macromolecules that may be suitable for inclusion as part of thebioactive component 12 include, but are not limited to polynucleotides, polypeptides, genetic material, peptide nucleic acids, aptamers, carbohydrates, mini-chromosomes, molecular polymers, aggregates or associations of an inorganic or organic nature, genes, any other hydrophilic macromolecule or any combination of any of these. - Some non-exhaustive examples of hydrophobic macromolecules that may be included part of the bioactive component12 include, but are not limited to, adregergic, adrenocotical steroid, adrenocortical suppressant, aldosterone antagonist, and anabolic agents; analeptic, analgesic, anesthetic, anorectic, and anti-acne agents; anti-adrenergic, anti-allergic, anti-amebic, anti-anemic, and anti-anginal agents; anti-arthritic, anti-asthmatic, anti-atherosclerotic, antibacterial, and anticholinergic agents; anticoagulant, anticonvulsant, antidepressant, antidiabetic, and antidiarrheal agents; antidiuretic, anti-emetic, anti-epileptic, antifibrionlytic, and antifungal agent; antihemorrhagic, inflammatory, antimicrobial, antimigraine, and antimiotic agents; antimycotic, antinauseant, antineoplastic, antineutropenic, and antiparasitic agents; antiproliferative, antipsychotic, antirheumatic, antiseborrheic, and antisecretory agents; antipasmodic, antihrombotic, antiulcerative, antiviral, and appetite suppressant agents; blood glucose regulator, bone resorption inhibitor, bronchodilator, cardiovascular, and cholinergic agents; fluorescent, free oxygen radical scavenger, gastrointestinal motility effector, glucocorticoid, and hair growth stimulant agent; hemostatic, histamine H2 receptor antagonists; hormone; hypocholesterolemic, and hypoglycemic agents; hypolipidemic, hypotensive, and imaging agents, immunizing and agonist agents; mood regulators, mucolytic, mydriatic, or nasal decongestant; neuromuscular blocking agents; neuroprotective, NMDA antagonist, non-hormonal sterol derivative, plasminogen activator, and platelet activating factor antagonist agent; platelet aggregation inhibitor, psychotropic, radioactive, scabicide, and sclerosing agents; sedative, sedative-hypnotic, selective adenosine A1 antagonist, serotonin antagonist, and serotonin inhibitor agent; serotonin receptor antagonist, steroid, thyroid hormone, thyroid hormone, and thyroid inhibitor agent; thyromimetic, tranquilizer, amyotrophic lateral sclerosis, cerebral ischemia, and Paget's disease agent; unstable angina, vasoconstrictor, vasodilator, wound healing, and xanthine oxidase inhibitor agent; immunological agents, antigens from pathogens, such as viruses, bacteria, fungi and parasites, optionally in the form of whole inactivated organisms, peptides, proteins, glycoproteins, carbohydrates, or combinations thereof, any examples of pharmacological or immunological agents that fall within the above-mentioned categories and that have been approved for human use that may be found in the published literature, any other hydrophobic bioactive component, or any combination of any of these.
- As used herein, the term “polypeptide” refers to a polymer of amino acids not limited by the number of amino acids. It is also to be understood that the term “polypeptide” is meant to encompass an oligopeptide, a peptide, or a protein, for example.
- As used herein, the term “polynucleotide” refers to RNA or DNA sequences of more than 1 nucleotide in either single chain, duplex or multiple chain form. The term “polynucleotide” is also meant to encompass polydeoxyribonucleotides containing 2′-deoxy-D-ribose or modified forms thereof, RNA and any other type of polynucleotide which is an N-glycoside or C-glycoside of a purine or pyrimidine base, or modified purine or pyrimidine base or basic nucleotide. The polynucleotide may encode promoter regions, operator regions, structural regions, termination regions, combinations thereof or any other genetically relevant material. Similarly, the term “genetic” as used herein, refers to any material capable of modifying gene expression.
- The first
aqueous composition 14 may be included in the method of the present invention as a gel, liquid, or in vapor form. The form of the firstaqueous composition 14 that is selected preferably permits the firstaqueous composition 14 to (1) remain stable prior to dissolving or dispersing the bioactive component, the surfactant composition 16, thesurfactant micelle 22, or optionally thestabilizer surfactant micelle 28, (2) homogeneously disperse thebioactive component 12, the surfactant composition 16, thesurfactant micelle 22, or optionally thestabilizer surfactant 28, (3) function as a continuous phase in an oil-in-water emulsion, (4) not interfere with, or mask the functional activity of thebioactive component 12, and (5) not modify or degrade thebioactive component 12, the surfactant composition 16, thesurfactant micelle 22, or optionally the stabilizedsurfactant micelle 28. - The first
aqueous composition 14 may include only water, or may optionally include additional solutes or solvents that do not interfere with the method of forming thenanocapsules 36 nor mask the functional activity of thebioactive component 12. Furthermore, those of ordinary skill in the art will recognize that an amount of the firstaqueous composition 14 used to prepare thenanocapsules 36 may vary depending upon thebioactive component 12, the surfactant composition 16, the temperature, pH, osmolarity, optional solutes or optional solvents, thesurfactant micelle 22, thebiocompatible polymer component 24, any desired characteristics of the stabilizedsurfactant micelle 28 or thenanocapsules 36. - The
bioactive component 12 may be added to the firstaqueous composition 14 or the firstaqueous composition 14 may be added to thebioactive component 12. While the order of addition of thebioactive component 12 and the firstaqueous composition 14 is not critical to the present invention, the hydrophilic composition (not shown) that is formed when thebioactive component 12 is dissolved or dispersed in the firstaqueous composition 14 is preferably capable of maintaining a homogeneous solution or dispersion in the hydrophilic composition. - The first
aqueous composition 14 may be supplied as an individual component or supplied in various prepared mixtures of two or more components that are subsequently combined to form the firstaqueous composition 14. Some non-exhaustive examples of the firstaqueous composition 14 include, but are not limited to, the above-mentioned water, nonpolar solvents, polar solvents, or any combination of any of these. Preferably, water is the firstaqueous composition 14. - The surfactant composition16 maybe introduced into the
bioactive component 12, the firstaqueous composition 14, the hydrophilic composition as a liquid, vapor or in granular form. The form of the surfactant composition 16 that is selected preferably permits the surfactant composition 16 to (1) remain stable prior to introducing into thebioactive component 12, the firstaqueous composition 14, or the hydrophilic composition, (2) be homogeneously dispersed into thebioactive component 12, the firstaqueous composition 14, or the hydrophilic composition, (3) form a micellar structure, (4) be adsorbed onto a surface of thebioactive component 12, the firstaqueous composition 14, the hydrophilic composition (5) displace the first aqueous composition that is located on the surface of thebioactive component 12, (6) partition thebioactive component 12 or the hydrophilic composition into a core of the micellar structure to form thesurfactant micelle 22, and (7) provide a thermodynamic driving force that is effective to reduce a size of thebioactive component 12,surfactant micelle 22, the stabilizedsurfactant 28 or thenanocapsule 36. - As used herein, a “surfactant” refers to any molecule containing a polar portion that thermodynamically prefers to be solvated by a polar solvent, and a hydrocarbon portion that thermodynamically prefers to be solvated by a non-polar solvent. The term “surfactant” is also meant to encompass anionic, cationic, or non-ionic surfactants. As used herein, the term “anionic surfactant” refers to a surfactant with a polar portion that ionizes to form an anion in aqueous solution. Similarly, a “cationic surfactant” refers to a surfactant having a cationic polar portion that ionizes to form a cation in aqueous solution. Likewise, a “non-ionic” surfactant refers to a surfactant having a polar portion that does not ionize in aqueous solution.
- While not wanting to be bound to theory, it is generally believed that a surfactant refers to a molecule that is effective to reduce a surface or an interfacial tension between a first substance dispersed in a second substance such that the first substance is solvated and any molecular groups of the first substance are dispersed. Typically, a hydrodynamic diameter of the first substance increases after addition of the surfactant. Nonetheless, the surfactant composition16 is believed to be effective to reduce the size or diameter of the
surfactant micelles 22 in the firstaqueous composition 14, to thereby reduce the size of the nanocapsule 36 when practicing the present invention. - The surfactant composition16 may include the surfactant component only (not shown), or may optionally include the
biocompatible oil component 18. The surfactant component may be characterized on the HLB scale that ranges from less than about 1 to more than about 13 units. - A surfactant component having an HLB value of less than about 6.0 units may be described as being poorly, or not dispersable in an aqueous or water-based composition. In addition, a surfactant component having an HLB value of less than about 6.0 units may be characterized as a hydrophobic or non-ionic surfactant. A surfactant component having an HLB value of more than about 7.0 units may be described as being capable of forming a milky to translucent to clear dispersion when the surfactant having an HLB value of more than about 7.0 units is dispersed in an aqueous or water-based composition.
- Preferably, the surfactant component of the surfactant composition16 has an HLB value of less than about 6.0 units when practicing the method of the present invention. Still more preferably the surfactant component of the surfactant composition 16 has an HLB value of less than about 5.0 units to facilitate preparation of nanocapsules having a diameter of less than about 50 nm.
- The surfactant component may also be characterized in terms of a critical micelle concentration (CMC) value. Preferably, the surfactant component of the surfactant composition16 has a CMC value of less than about 300 micromolars (μm). Still more preferably, the surfactant component has a CMC value of less than about 200 μm.
- While not wanting to be bound to theory, it is believed that the surfactant component of the surfactant composition16 adsorbs onto the surface of the
bioactive component 12 when introduced into the firstaqueous composition 14 to minimize exposure of a surface of the hydrophobic surfactant component to a thermodynamically unfavorable environment created by the firstaqueous composition 14. Therefore, the surfactant component adsorbs onto the surface of the bioactive component to reduce the surface area of the surfactant component that may be exposed to the firstaqueous composition 14. Adsorption of the surfactant component onto thebioactive component 12 is believed to facilitate the size reduction of thebioactive component 12 and/or thesurfactant micelle 22. - The surfactant component of the surfactant composition16 may be supplied as individual surfactants or supplied in various prepared mixtures of two or more surfactants that are subsequently combined to form the surfactant composition 16. Some non-exhaustive examples of suitable surfactants having an HLB value of less than about 6.0 units or a CMC value of less than about 200 μm be listed in Dermatological Formulations (Barry, B., Marcel Dekker, (1983)), or in Percutaneous absorption: drug, cosmetics, mechanisms, methodology, 3rd ed., Bronough, R. ed., 1999, or the Handbook of Industrial Surfactants (Ash, M., Ed., Gower Pub. (1993), which are incorporated herein by reference. As an example, the surfactant component maybe 2, 4, 7, 9-tetramethyl-5-decyn-4, 7-diol(TM-diol), blends of 2, 4, 7, 9-tetramethyl-5-decyn-4, 7-diol(TM-diol), molecules having one or more acetylenic diol groups, cetyl alcohol or any combination of any of these.
- The optional
biocompatible oil component 18 of the surfactant composition 16 may be combined with the surfactant component as a liquid, vapor or in granular form. The form of the optionalbiocompatible oil component 18 that is selected preferably permits the optionalbiocompatible oil component 18 to (1) remain stable prior to introduction into the surfactant composition 16, (2) be homogeneously blended into the surfactant composition 16, (3) dissolve or disperse the surfactant component, and (4) increase the hydrophobicity of the surfactant composition 16, and therefore, the degree to which the size of thebioactive component 12, thesurfactant micelle 22, thestabilizer surfactant micelle 28, or thenanocapsule 36 may be reduced when practicing the present invention. - Preferably, the concentration of the optional
biocompatible oil component 18 in the surfactant composition 16 ranges from about 10−7 weight percent to about 10 weight percent, based upon a total volume of the stabilizedsurfactant micelles 28 in the firstaqueous composition 14. Concentrations of the optionalbiocompatible oil component 18 higher than about 10 weight percent, based upon the total volume of thesurfactant composition 18, may be less desirable because such higher concentrations increase a phase volume of the biocompatible oil, and consequently may cause difficulties in preparing, dispersing and/or handling thesurfactant micelles 22, the stabilizedsurfactant micelles 28 or thenanocapsules 36. Concentrations of the optional biocompatible oil component lower than about 10−7 weight percent in the surfactant composition 16 may be less preferred, because such lower concentrations would not be effective to solvate the surfactant component, or increase the hydrophobicity of the surfactant composition 16, and may ultimately increase the diameter of thenanocapsules 36. - The optional
biocompatible oil component 18 of the surfactant composition 16 may be supplied as an individual biocompatible oil or supplied in various prepared mixtures of two or more biocompatible oils that are subsequently combined to form the optionalbiocompatible oil component 18. Some non-exhaustive examples of suitable biocompatible oils that may be included as part of thebiocompatible oil component 18 may be found in Dermatological Formulations (Barry, B., Marcel Dekker, (1983)), or in Percutaneous absorption: drug, cosmetics, mechanisms, methodology, 3rd ed., Bronough, R. ed. , 1999, or in the Handbook of Industrial Surfactants (Ash, M., Ed., Gower Pub. (1993), which have been incorporated herein by reference. Preferably, food or USP grade oils, such as DMSO, DMF, castor oil, or any combination thereof, are used to practice the present method. - The surfactant composition16 may be included at an amount that is effective to form the micellar structure that partitions the
bioactive component 12, the firstaqueous composition 14 or the hydrophilic composition into the core of the micellar structure when forming thesurfactant micelle 22. Still more preferably, the surfactant composition 16 is included at an amount that is effective to provide a maximum thermodynamic driving force that minimizes the size of thebioactive component 12, thesurfactant micelle 22, and ultimately, the size of the nanocapsule 36 when practicing the present invention. - Furthermore, those of ordinary skill in the art will recognize that the amount of the surfactant composition16 may be varied based upon the
bioactive component 12, the firstaqueous composition 14, a ratio of the surfactant component to the optionalbiocompatible oil 18, any desired characteristics of thesurfactant micelles 22, the stabilizedsurfactant micelles 28 or thenanocapsules 36. For example, a surfactant composition containing a surfactant component having an HLB value of about 6.0 units mixed with a nonpolar biocompatible oil like castor oil, may provide the same degree of a thermodynamic driving force as a second surfactant composition containing a surfactant component of about 4.0 units mixed with DMSO. - The amount of the surfactant composition16 may range up to about 0.5 weight percent, based upon a total volume of the stabilized surfactant micelles dispersed in the first
aqueous composition 14. Still more preferably, the amount of the surfactant composition 16 is less than about 0.25 weight percent, based upon the total volume of the stabilizedsurfactant micelles 28 dispersed in the firstaqueous composition 14. Most preferably, the surfactant composition 16 is present at an amount of less than about 0.05 weight percent, based upon the total volume of the stabilizedsurfactant micelles 28 dispersed in the firstaqueous composition 14. As one non-exhaustive example, the surfactant composition 16 may be added to the total volume of the hydrophilic composition at a concentration of about 500 ppm, based on the total volume of the stabilizedsurfactant micelles 28 in the firstaqueous composition 14. - The
first dispersing apparatus 20 initiates and promotes formation of the micellar structures that are based on thebioactive component 12, the firstaqueous composition 14 and the surfactant composition 16. Adsorption of surfactant component onto the surface of thebioactive component 12, or hydrophilic composition continues until all of the surfactant molecules cover, and therefore, entrap thebioactive component 12 or hydrophilic composition in the core of the micellar structure to formsurfactant micelles 22. Formation of a plurality ofsurfactant micelles 22 in the firstaqueous composition 14 forms a dispersion ofsurfactant micelles 22. - In general, any
conventional dispersing apparatus 20 that is capable of homogenously blending or dispersing may be suitable for use in forming the dispersion of surfactant micelles in accordance with the present invention. Furthermore, those of ordinary skill in the art will recognize that the first dispersingapparatus 20 may vary depending upon the desired characteristics of thenanocapsules 36. For example, the first dispersingapparatus 20 may include any device, such as a sonicating or a vortexing apparatus (not shown), or the like to disperse thebioactive component 12 in the hydrophilic composition, and the formation of thesurfactant micelles 22 after addition of the surfactant composition 16. Nonetheless, while the first dispersingapparatus 20 may include a sonicating or a vortexing apparatus, the sonicating or the vortexing apparatus is not critical when practicing the method of the present invention. - As used herein, a “surfactant micelle” may be characterized as a close packed mono-molecular barrier of surfactant molecules at an interface between the
bioactive composition 12 and the surfactant composition 16, such that the barrier encapsulates thebioactive component 12, the firstaqueous composition 14 or the hydrophilic composition. It is also to be understood that the term “surfactant micelle” encompasses partial or hemi-surfactant micelles that partially enclose thebioactive component 12, the firstaqueous composition 14 or the hydrophilic composition. - When the
bioactive component 12 is a hydrophilic bioactive component, the polar portion of the surfactant molecule associates with a surface of the hydrophilic bioactive component. When thebioactive component 12 is a hydrophobic bioactive component, the hydrocarbon portion of the surfactant micelle associates with a surface of the hydrophobic bioactive component. - The formation of a surfactant micelle typically occurs at a well defined concentration known as the critical micelle concentration. As noted, surfactant components having a CMC value of less than about 200 micromolars are preferred when practicing the present invention.
- After forming the dispersion of
surfactant micelles 22, the dispersion ofsurfactant micelles 22 is transferred into the stabilizingapparatus 26 where abiocompatible polymer component 24 is added to stabilize the dispersion ofsurfactant micelles 22. Alternatively, thebiocompatible polymer component 24 may be added to the dispersion ofsurfactant micelles 22 in the first dispersingapparatus 20 which obviates the need for the stabilizingapparatus 26. - The
biocompatible polymer component 24 stabilizes the dispersion ofsurfactant micelles 22 to form stabilizedsurfactant micelles 28 within the firstaqueous composition 14. Therefore, a dispersion of stabilizedsurfactant micelles 28 are present within the firstaqueous composition 14 after addition of thebiocompatible polymer component 24. - As used herein, the term “biocompatible” refers to a material that is capable of interacting with a biological system without causing cytotoxicity, undesired protein or nucleic acid modification or activation of an immune response.
- The
biocompatible polymer component 24 may be introduced into the dispersion ofsurfactant micelles 22 as a liquid, vapor or in granular form. The form of thebiocompatible polymer component 24 that is selected preferably permits thebiocompatible polymer component 24 to (1) remain stable prior to addition into the dispersion ofsurfactant micelles 22, (2) be homogeneously dispersed into the dispersion ofsurfactant micelles 22, (3) increase a viscosity of the firstaqueous composition 14, (4) form a boundary layer at an interface of thesurfactant micelle 22 and the firstaqueous composition 14, (5) be absorbed onto a surface of thesurfactant micelles 22, (6) be capable of iontophoretic exchange, (7) be capable of being precipitated upon addition of a solute, (8) be capable of enzymatic degradation, surface and/or bulk erosion, (9) not interfere with or mask the functional activity of thebioactive component 12, (10) prevent aggregation and/or agglomeration of the dispersion ofsurfactant micelles 22, and (11) be capable of obtaining a particular dissolution profile. - The
biocompatible polymer component 24 may be included at an amount that is effective to coat and therefore stabilize thesurfactant micelle 22. Furthermore, those of ordinary skill in the art will recognize that the amount of thebiocompatible polymer component 24 used to stabilize thesurfactant micelles 22 may vary depending upon thebioactive component 12, the firstaqueous composition 14, the surfactant composition 16, the temperature, pH, osmolarity, presence of any optional solutes or optional solvents, thesurfactant micelle 22, any desired characteristics of the stabilizedsurfactant micelle 28, thenanocapsules 36, or a desired dissolution profile. - While the concentration of the
biocompatible polymer component 24 is not critical to the present invention, the concentration of thebiocompatible polymer component 24 is preferably based upon the bioactive component and on the desired dissolution profile. When the concentration of thebiocompatible polymer component 24 is to high, the shell of thenanocapsule 36 may not dissolve. If the concentration of thebiocompatible polymer component 24 is to low, the shell of thenanocapsule 36 may dissolve rapidly in a manner that promotes cytotoxicity, for example. In addition, too low a concentration of thebiopolymer component 24 may not provide an effective degree of mechanical force to stabilize thesurfactant micelles 28. - Concentrations of the
biocompatible polymer component 24 that are to high may also be less desirable because such higher concentrations may increase the viscosity of the firstaqueous composition 14, and consequently may cause difficulties in preparing, mixing and/or transferring thestabilizer surfactant micelles 28. Concentrations of thebiocompatible polymer component 24 that are to low may be less preferred, because lower concentrations may not provide the needed viscosity to stabilize the surfactant micelles, nor be capable of effectively coating thesurfactant micelles 22 to prevent aggregation of thesurfactant micelles 22 in the firstaqueous composition 14. - The
biocompatible polymer component 24 may be supplied as individual biocompatible polymers or supplied in various prepared mixtures of two or more biocompatible polymers that are subsequently combined to form thebiocompatible polymer component 18. Some non-exhaustive examples of biocompatible polymers include polyamides, polycarbonates, polyalkylenes, polyalkylene glycols, polyalkylene oxides, polyalkylene terepthalates, polyvinyl alcohols, polyvinyl ethers, polyvinyl esters, polyvinyl halides, polyvinylpyrrolidone, polyglycolides, polysiloxanes, polyurethanes and copolymers thereof, alkyl cellulose, hydroxyalkyl celluloses, cellulose ethers, cellulose esters, nitro celluloses, polymers of acrylic and methacrylic esters, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxy-propyl methyl cellulose, hydroxybutyl methyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, cellulose acetage phthalate, carboxylethyl cellulose, cellulose triacetate, cellulose sulphate sodium salt, poly(methyl methacrylate), poly(ethylmethacrylate), poly(butylmethacrylate), poly(isobutylmethacrylate), poly(hexlmethacrylate), poly(isodecylmethacrylate), poly(lauryl methacrylate), poly(phenyl methacrylate), poly(methyl acrylate), poly(isopropyl acrylate), poly(isobutyl acrylate), poly(octadecyl acrylate), polyethylene, polypropylene poly(ethylene glycol), poly(ethylene oxide), poly(ethylene terephthalate), poly(vinyl alcohols), poly(vinyl acetate, poly vinyl chloride polystyrene, polyvinylpryrrolidone, polyhyaluronic acids, casein, gelatin, glutin, polyanhydrides, polyacrylic acid, alginate, chitosan, poly(methyl methacrylates), poly(ethyl methacrylates), poly(butylmethacrylate), poly(isobutylmethacrylate), poly(hexlmethacrylate), poly(isodecl methacrylate), poly(lauryl methacrylate), poly(phenyl methacrylate), poly(methyl acrylate), poly(isopropyl acrylate), poly(isobutyl acrylate), poly(octadecl acrylate) and combination of any of these. - Additionally, biocompatible polymers that have been modified for enzymatic degradation, or change upon application of light, ultrasonic energy, radiation, a change in temperature, pH, osmolarity, solute or solvent concentration may also be included as part of the
biocompatible polymer component 24. Preferably, thebiocompatible polymer component 24 is a hydrophilic polymer that is capable of substantially coating, and preferably continuously coating thesurfactant micelle 22. Still more preferably, the hydrophilicbiocompatible polymer component 24 is capable of ionotophoretic exchange. - Though descriptions of the present invention are primarily made in terms of a hydrophilic
biocompatible polymer component 24, it is to be understood that any other biocompatible polymer, such as hydrophobic biocompatible polymers may be substituted in place of the hydrophilic biocompatible polymer, in accordance with the present invention, while still realizing benefits of the present invention. Likewise, it is to be understood that any combination of any biocompatible polymer may be included in accordance with the present invention, while still realizing benefits of the present invention. - In general, any conventional apparatus and technique that is suitable for permitting the
biocompatible polymer component 24 to stabilize thesurfactant micelles 22 may be used as the stabilizingapparatus 26 in accordance with the present invention. Furthermore, any other device, such as high pressure homogenization or high ultrasound sonication is preferably not included during stabilization. - After stabilizing the
surfactant micelles 22, the stabilizedsurfactant micelles 28 may be transferred into a secondaqueous composition 30 located in asecond dispersing apparatus 32. The stabilizedsurfactant micelles 28 may be transferred by mechanically forming droplets of the stabilizedsurfactant micelle 28 that are subsequently introduced into the secondaqueous composition 30. - The second
aqueous composition 30 may include water only, or may optionally include a solute to precipitate thebiocompatible polymer component 24 surrounding the stabilizedsurfactant micelle 28. Some non-exhaustive examples of solutes that may be used to precipitate thebiocompatible polymer 24 include ionic species derived from elements listed in the periodic table. - Preferably, the second
aqueous composition 30 includes a solute in an amount that is effective to precipitate thebiocompatible polymer component 24 and form the dispersed, and optionally atomized nanocapsules 36 of the present invention. As used herein, the term “precipitate” refers to a solidifying or a hardening of thebiocompatible polymer component 24 that surrounds the stabilizedsurfactant micelles 28. It is also to be understood that the term “precipitation” is also meant to encompass any crystallization of thebiocompatible polymer 24 that may occur when thebiocompatible polymer component 24 is exposed to the solute. - Additionally, any other component that is capable of modulating the efficacy the
nanocapsules 36 may be included as part of the second aqueous composition to thereby modulate the functional activity of thenanocapsule 36. For example, the second aqueous composition may include additional coating excipients, such as a cell recognition component or various ionic species, such as Mn2+, Mg2+, Ca2+, Al3+, Be2+, Li30 , Ba2+, Gd3+, or any other ionic species that is capable of interacting with thebiocompatible polymer component 24. - The term “cell recognition component”, as used herein, refers to a molecule capable of recognizing a component on a surface of a targeted cell. Cell recognition components may include an antibody to a cell surface antigen, a ligand for a cell surface receptor, such as cell surface receptors involved in receptor-mediated endocytosis, peptide hormones, and the like.
- It has been observed that when the stabilized
surfactant micelles 28 are allowed to incubate in the secondaqueous composition 30 that includes the solute to precipitate thebiocompatible polymer component 24, thenanocapsules 36 undergo a reduction in size. Furthermore, the formation of a flocculated suspension of thenanocapsules 36 has also been observed after incubating the stabilizedsurfactant micelles 28 in the second aqueous composition. - As used herein, “a flocculated suspension” refers to the formation of a loose aggregation of discrete particles held together in a network-like structure either by physical absorption of bioactive components, bridging during chemical interaction (precipitation), or when longer range van der Waals forces of attraction exceed shorter range forces of repulsion. The flocculated suspension of
nanocapsules 36 may entrap varying amounts of the firstaqueous composition 14 or the secondaqueous composition 30 within the network-like structure. Additionally, the flocculated suspension of nanocapsules may be gently tapped to disperse thenanocapsules 36. - The stabilized
surfactant micelles 28 may be transferred into the secondaqueous composition 30 via atomization through a nozzle (not shown) having a particular orifice size or through an aerosolizing apparatus (not shown). Atomizing or aerosolizing the stabilizedsurfactant micelles 28 typically includes the application of a shear force that may be capable of further dispersing the stabilizedsurfactant micelles 28. Furthermore, the application of the shear force during transfer may also be effective to (1) reduce the size of thenanocapsules 36, or (2) break up any agglomerates or associations between stabilizedsurfactant micelles 28 that may have formed in the stabilizingapparatus 26. Nozzle pressures of less than about 100 psi, for example, may be used to atomize the stabilizedsurfactant micelles 28. - The diameter of the
nanocapsules 36 may also be varied depending upon the orifice size of the nozzle that may be used to transfer the stabilizedsurfactant micelles 28 into the second aqueous composition. Alternatively, the stabilizedsurfactant micelles 28 may be added to the secondaqueous composition 30 containing the solute that precipitates thebiocompatible polymer 24 to form a dispersion ofnanocapsules 36 for purposes of providing the dispersion for sub-cutaneous delivery of the nanocapsules, for example. - After precipitating and/or optionally incubating the
nanocapsules 36 in the secondaqueous composition 30, thenanocapsules 36 may be filtered, centrifuged or dried to obtain separate anddiscrete nanocapsules 36. Thenanocapsules 36 may be frozen or reconstituted for later use or may be delivered to a target cell or tissue by such routes of administration as oral, intravenous, subcutaneous, intraperitoneal, intrathecal, intramuscular, inhalational, topical, transdermal, suppository (rectal), pessary (vaginal), intra urethral, intraportal, intrahepatic, intra-arterial, intra-ocular, transtympanic, intraumoral, intrathecal, or any combination of any of these. - The
nanocapsules 36 having a diameter of less than about 50 nm are advantageous in the delivery of bioactive components to target cells for several reasons. First, nanocapsules 36 having a diameter of less than about 50 nm enhances delivery of bioactive components by protecting the bioactive components against degradation during transport to the target cell. - Second, nanocapsules36 having a diameter of less than about 50 nm promotes efficient cellular uptake. Efficient cellular uptake into the target cell typically occurs when a particle has a diameter of less than about 50 nm, as opposed to when a particle has a diameter of more than about 50 nm.
- Third, it is believed that uptake of the
nanocapsules 36 by the target cell occurs via transport systems, such as a non-endosomal pathway, that prevents lysosomal degradation of thenanocapsules 36. Indeed, it is believed that thenanocapsules 36 of the present invention are efficiently exported into a cell via a caveolin-regulated pathway that circumvents most, if not all, endosomal-regulated pathways that typically degradenanocapsules 36. - Fourth, the
nanocapsules 36 have a biocompatible polymer shell that is separate from the bioactive component. In fact, the bioactive component is not entangled in, embedded in, or adsorbed onto the biocompatible polymer shell of thenanocapsules 36. When the bioactive component is not entangled in, embedded in, or adsorbed onto the biocompatible polymer shell, the cell that incorporate thenanocapsules 36 avoid apoptosis or cell death. - Fifth, enclosing the bioactive component within a core surrounded by the biocompatible polymer shell when preparing the
nanocapsules 36 in accordance with the present method is advantageous in avoiding premature degradation of thenanocapsules 36, or a cytotoxic response during in vivo transport of the nanocapsule. Enclosing the bioactive component within the core results in a linear release rate of the bioactive component without any zero burst phenomenon during release from thenanocapsules 36. - The linear release rate of the bioactive component from the nanocapsule without any zero burst phenomenon is also an advantageous feature as the linear release rate allows rational design of coating dissolution profiles to minimize cytotoxicity. As used herein, the term “dissolution profile” refers to a rate at which the biocompatible polymer shell is dissolved or degraded to release a bioactive agent from a core of a nanocapsule.
- Another benefit of the
nanocapsules 36 prepared by the method of the present invention is that little, if any, addition of an organic solvent is required to form thenanocapsules 36. Eliminating the use of most, if not all, organic solvents from the method of the present invention is beneficial since organic solvents may damage thebioactive component 12, destroy the target cells, or be toxic during preparation of thenanocapsule 36. The elimination of most, if not all, use of organic solvents eliminates the need for complex solvent removal techniques, such as solvent dilution, vacuum evaporation, or the like, and obviates any associated costs or complex process strategies during preparation of thenanocapsules 36. - The
nanocapsules 36 of the present invention further permits stable encapsulation of a bioactive component, and in particular, hydrophilic bioactive components, such as polynucleotides and polypeptides. “Stable encapsulation”, as used herein, refers to maintenance of the encapsulated bioactive component's structure. For nucleic acids, the appearance of low molecular weight nucleic acid breakdown products, which may be assayed for by electrophoresis, is substantially eliminated. Thenanocapsules 36 may also be used to encapsulate any bioactive component regardless of water solubility or charge density. - The
nanocapsules 36 may be combined with additional polymeric binders, surfactants, fillers, and other excipients to incorporate thenanocapsules 36 into solid dosage forms such as granules, tablets, pellets, films or coatings for use in enhancedbioactive component 12 delivery. In this way, design of the dissolution profile, control of the particle size, and cellular uptake remains at the level of the nanocapsule. Such applications include, but are not limited to, creation of rapidly dissolving nanocapsule pellets for pulmonary delivery or nanocapsule films for device-mediated delivery. - In another application, the
nanocapsules 36 may be designed for specific cellular or tissue uptake by polymer selection and/or inclusion of cell-recognition components in the nanocapsule biocompatible polymer shell or coating. Such coatings will have utility for specific or increased delivery of the bioactive agent to the target cell. Such applications include, but are not limited to tumor-targeting of chemotherapeutic agents or anti-sense DNA, antigen delivery to antigen-presenting cells, ocular delivery of ribozymes to retinal cells, transdermal delivery of protein antibodies, or transtympanic membrane delivery of peptide nucleic acids. - Property Determination and Characterization Techniques
- Various analytical techniques are employed herein. An explanation of these techniques follows:
- FIG. 1A: Samples were prepared on freshly cleaved mica as dispensed, dried in air and imaged using a Nanoscope II multimode AFM (Digital Instruments) with a J type scanner and ambient tapping mode holder. 125 μm long silicon cantilevers type IBMSC were from IBM and have resonant frequencies of 250-450 kHz. All imaging was in tapping mode, images were 512×512 pixels and scanning frequency was 1 kHz. Height, amplitude and phase images were collected. Images were processed in DI software and analyzed in NIH Image SXM. A: Formula Q from 2-phase system, low HLB surfactant, B: Formula S from 2-phase system, high HLB surfactant, C: Formula T from 1-phase system, high HLB surfactant, D: Formula V from 2-phase system, surfactant below CMC.
- FIG. 1B: Nanocapsules were released into a solution of 10% isobutanol in Phosphate-buffered Saline (PBS), pH=7.2. Samples were run in duplicate. FIG. 1C: Nominal 300 ng samples of DNA were aliquoted from a master batch containing surfactant and processed through commercial miniprep columns. Eluate was recycled through Qiaquik columns and collected either 3 times (4, 5) or twice (6,7) or recycled through Zymoclean columns and collected twice (8,9). Samples were alcohol precipitated using a commercial coprecipitant, electrophoresed on 1.5% agarose gels modified with Synergel, stained with SybrGold dye, digitized on a Storm 860 and compared to unmodified but reprecipitated samples from the same master batch (10,11). Lanes 1-3: 100, 50 and 5 ng of ?_DNA.
- FIG. 2: Endocytic activity was assessed by immunosignal levels of clathrin (Chemicon). Potocytotic activity was assessed by immunosignal for caveolin-1 as described in the literature (Transduction Laboratories). Lysosomal activity was detected by an monoclonal antibody to Lamp-1 (Transduction Laboratories). Nanocapsule localization was detected by streptavidin-biotin immunocomplexes directed against sheep IgG (Jackson Laboratories). Nanocapsule coatings were spiked with ovine IgG to enable this detection strategy.
- FIG. 3: immortalized Rt-1 fibroblast cultures at 70% confluence were treated for 4 days with increasing amounts of nanocapsule formula K and transiently treated (3 hours) with an optimized liposomal formula (dose, 500 ng) Results are expressed as a percentage of cellular actin integrated intensity and compared to the liposomal formula. Expression vector was code 448: pEF/myc-his/GFP (Invitrogen).
- FIG. 4A: Radiated porcine biopsies were snapfrozen 7 days after treatment with saline or 6 μg of controlled release nanocapsules, then homogenized in RIPA. 100 μg lysate samples were electrophoresed on SDS-Page gradient gels, transferred to nitocellulose membranes and detected for either §-galactosidase (121 Kd) or involucrin (˜100 kD) using chemiluminescence. Results were normalized to the post-transfer gel stained with Coomassie due to interference at 100 kD from a gel defect. Involucrin, a component of the cornified membrane, manufactured by suprabasal cells can be detected in radiated porcine skin and will be used for future normalization purposes. Lane A: N, topical, biopsy oc-2; B: N, topical, biopsy oc-3; C: 0, topical, biopsy 1-1; D: PBS only, biopsy 1-5; E: N, subcutaneous injection, biopsy 1-6.
- FIG. 4B: The β-galactosidase reporter protein was detected by a monoclonal antibody directed at an incorporated fusion protein tag. A: N, topical, biopsy oc-1, detection with anti-Xpressa; B: Matching view to A with detection for anti-von Willenbrand factor (Sigma);C: untreated biopsy, detection with anti-Xpressa(Invitrogen).
- FIG. 5: Nanocapsules were incorporated into an aqueous suture coating and sutures were applied to pigskin biopsies in organ culture. Nanocapsules were detected with Cy3 conjugated-streptavidin-biotin complexes to incorporated ovine IgG and GFP transgene expression was detected by rabbit polyclonal antibodies to GFP (Abcom) in combination with Fitc-conjugated polyclonal antibodies to rabbit IgG and Alexa 488-conjugated polyclonal antibodies to Fitc (Molecular Probes). Controls omitting primary antibodies were included for signal-to-background level estimation.
- FIG. 6A: Nanocapsules were detected as previously described and GFP transgene expression was detected by rabbit polyclonal antibodies to GFP in combination with Cy3-conjugated antibodies to rabbit IgG (Jackson Laboratories).
- FIG. 6B: GFP expression was detected as described in FIG. 5 and cell nuclei were counterstained with 10 μg/ml bisbenzamide.
- FIG. 6C: Carcinoma cells and HDF's were seeded overnight into 96 well plates at 2000 and 6000 cells per well respectively. Cisplatin preparations were added to wells for 18 hours as noted on the graph than washed out. After 72 hours cell viability of assessed by a commercial MTT assay (WST assay, Boehringer Mannheim). Wells were executed in duplicate.
- FIG. 7: Colocalization with lysosomes was detected using a monoclonal antibody to Lamp-1 (Transduction Laboratories). AFM images are included of O-methyl RNA formulated by nanoencapsulation or complexation with 27 KD polyethyleneimine.
- The present invention is more particularly described in the following Examples which are intended as illustrations only since numerous modifications and variations within the scope of the present invention will be apparent to those skilled in the art.
- Reagents:
- A. Nucleic acid condensing agents
- Poly(ethylenimine) (PEI) at 27 KiloDalton (kD). PEI was used at optimized conditions (90% charge neutralization)
- Polylysine (PLL) at 70-150,000 molecular weight. PLL condensing materials were conjugated with nuclear signal localization peptides, either SV-40 T antigen or cys-gly-tyr-gly-pro-lys-lys-lys-arg-lys-val-gly-gly using carboxiimide chemistry available from Pierce Chemical (Rockford, Ill.).
- Preparations of nuclear matrix proteins (NMP). NMP were collected from a rat fibroblast cell line, and a human keratinocyte cell line using a procedure described in Gerner et al.J. Cell. Biochem. 71 (1998):363-374 which is incorporated herein by reference. Protein preparations were conjugated with nuclear signal localization peptides as described.
- B. Surfactants
- 2, 4, 7, 9 - tetramethyl-5-decyn-4, 7 - diol (TM-diol): HLB=4-5, CMC is not determined
- Poly(oxy-1, 2-ethanediol), a-(4-nonylphenol)-w-hydroxy, Tergitol NP-40 (NP40): HLB=17.8, CMC 180 μM,
-
Polyoxyethylene 20 sorbitan monooleate (Tween 80): HLB=10, CMC 920 μM, Cetyl Alcohol: HLB=4,CMC is not determined. - C. Polymers
- Hyaluronan, bacterially-derived, 1 million kiloDalton (MM kD) and conjugated with nuclear localization signal peptides as described in U.S. Pat. No. 5,846,561, which is incorporated herein by reference.
- Hyaluronan, derived from human umbilical cord, about 4MMKD and not conjugated.
- Povidone (polyvinylpyrolidone, PVP) 10,000 kD MW and not bioconjugated Povidone (polyvinylpyrolidone, PVP) 40,000 Kd MW and not bioconjugated Povidone (polyvinylpyrolidone, PVP) 360,000 kD MW and not bioconjugated Tenascin, 220 kD and not bioconjugated.
- D. Expression Vectors
- 334: pcDNA/His/LacZ, produces galactosidase, incorporates CMV promoter, based on pcDNA 3.1. (Invitrogen), 8.6 kB
- 425: pEGFP-c/farn, enhanced GFP (green fluorescent protein) expression vector modified with a farnasyl moiety to improve microscopy, CMV promoter, 4.6 kB
- 423: pEGFP-c3/p57(Kpn/Sma) Clontech enhanced GFP (green fluorescent protein) expression vector modified with a nuclear localization tag from a cyclin dependent kinase to improve microscopy, 4.6 kB
- E. Cells
- CCRL 1764: Immortalized rat neonatal fibroblast cell line
- HaCaT: immortalized human keratinocyte cell line
- Ca9: human tumor cells derived from a squamous cell carcinoma of tongue origin.
- The importance of appropriate dispersion conditions was investigated in the following series of formulations. Formulae were produced by i) predispersing 25 μg of DNA (425) on ice using a bath sonicator, ii) condensing DNA in a small amount of water by vortexing then incubating on ice for 20 minutes, iii) adding surfactant then oil followed by 30 seconds of probe sonication at 10 Watts, iv) diffusion dilution to 3 milliliters (mL) by first adding saline then 1 MM kD hyaluronan polymer (1%) as a protective colloid, v) mechanically shearing emulsion into droplets by pumping through a 250 micrometer (μm) orifice into 22 mL of PBS, 10 milliMolar (mM) Ca2+, 200 mM Li+, vi) incubating overnight end over end and vii) centrifuging to recover nanoparticles for resuspension and filter sterilization. The condenser-to-DNA weight ratio was determined by dye exclusion at 90% charge neutralization. TM-diols were used in this experiment to represent water-immiscible surfactants, while Tergitol NP40 and Tween 80 were used to represent water-soluble and even more water-soluble emulsifiers/dispersing aids.
- Dispersion conditions were systematically varied to discourage micelle formation in aqueous media by i) choosing water-soluble surfactants (Formulae S,T,U, and V), ii) removing the dispersed phase (Formula T) and iii) decreasing surfactant loading below that required for micelle formation. Formula U featured use of a water-miscible oil (silicone oil).
- Formulas were characterized physically and tested for functionality in in vitro gene transfer. Quantitative results are summarized in Table 1A:
TABLE 1A Effect of changing dispersion conditions on hydrophillic nanocapsules. Formula Q R S Experimental surf > CMC surf > CMC surf > CMC Modification: Critical Micelle ˜0 ˜0 360 ppm Concentration (CMC) Pre-aerosol surfactant 500 ppm 500 ppm 600 ppm Concentration (3 ml basis) HLB number 4-5 4 17.8 Phases Water/ Water/ Water/ misc. oil misc. oil misc. oil Formula Characteristics: Nucleic Acid 86 ± 8 67 ± 1.4 50.3 ± 12 Incorporation (%) Low MW DNA 15.00 76 93.00 Appearance (% above bkground, Post nanocapsule digest by electrophoresis) Supercoil retention 87% 65% 66% (post 100 hrs release) (area %, initial distribution = 76% supercoiled) Particle Size 42 ± 2 45 ± 3 73 ± 4 (mean ± SE) Secondary Structure(s) 25% 30% 70% Flocculation Status 100-200 nm 500 nm 300 nm stringy flocs stringy flocs spheroid aggregates Comments: Performance: Transduced GFP 420 340 0 Protein Generation (pixel units, % of control liposome formula, 100 μg total protein, Day 11) -
TABLE 1A Effect of changing dispersion conditions on hydrophillic nanocapsules. Formula T U W V Experimental surf > CMC surf > CMC surf > CMC surf < CMC Modification: Critical Micelle 360 ppm 360 ppm 1200 ppm 360 ppm Concentration (CMC) Pre-aerosol 600 ppm 600 ppm 4000 ppm 90 ppm surfactant Concentration (3 ml basis) HLB number 17.8 17.8 10 17.8 Phases Water only Water/immisc. oil Water/misc. oil Water/misc. oil Formula Characteristics: Nucleic Acid 39 ± 1.7 32.8 ± 6 37 ± 1.41 57.6 ± 16 Incorporation (%) Low MW DNA 53.00 66 28 41.00 Appearance (% above bkground, Post nanocapsule digest by electrophoresis) Supercoil retention 59% 43% 65% 80% (post 100 hrs release) (area %, initial distribution = 76% supercoiled) Particle Size (mean ± SE) 226 ± 11 291 ± 25 150 ± 7 199 ± 11 S < 10% S < 10% S > 40% S > 80% 400 nm Secondary yeast-like aggregates Structure(s) aggregates Flocculation Status ppt. during ppt. during ppt. during Comments: aerosolization aerosolization aerosolization Performance: 0 0 0 0 Transduced GFP Protein Generation (pixel units, % of control liposome formula, 100 μg total protein, Day 11) - Nanocapsule sizing was determined by tapping mode AFM and images are illustrated in FIG. 1A. The data indicate average nanocapsule sizes less than 50 nm are achievable only with multi-phase systems in combination with low water solubility surfactants (Table 1A: Formulae Q,R vs. S,T,U,V, and W). Furthermore, only nanocapsules of less than 50 nm resulted in detectable transgene production in CRL-1764 rat fibroblast cells (Table 1A). Effective dispersion also corresponded with decreased aggregation and enhanced DNA stability (as indicated by decreased electrophoretic breakdown products). The starting DNA was partially relaxed (76% supercoiled by electrophoresis). Using this value as a basis, supercoil retention in DNA still encapsulated following 100 hrs of release testing, was excellent in multi-phase systems.
- Release profiles for hydrophillic dispersed atomized nanocapsules were linear, showed no zero burst and resulted in about 60% release after 72 hours (See FIG. 1B). Formula W, manufactured with the most water-soluble surfactant in the series (Tween 80) failed to completely release loaded DNA. FIG. 1C illustrates that small amounts of DNA (in this case 300 nanograms of DNA) can be recovered accurately in a procedure comprising butanol extraction of 10% butanol/saline releasing fluid followed by isolation on a miniprep column and measurement of absorbance at 260 nm excitation. Results obtained from UV spectroscopy are confirmed by electrophoresis of recovered DNA following alcohol coprecipitation with a commercial coprecipitant aid. Experiment 1A demonstrates the importance of a multi-phase system in creating coated particles from the micellar solution, defines surfactant requirements and validates method for measuring in vitro release profiles.
- To investigate the effect of modulating process parameters on nanocapsule functionality for DNA delivery, a series of formulas (designed to release in 3 days) were prepared and measured transduction efficiency of these formulas for delivering a nuclear Green Fluorescent Protein (GFP) reporter transgene in
rat fibroblast cultures 5 days later. Charge neutralization of the DNA molecule, the surfactant/oil system, total surfactant phase volume, the inclusion of probe sonication, the absolute requirement for atomization and receiving bath osmolality were modulated. Results for this experiment are summarized in the Table 1B:TABLE 1B Effective of process parameters on particle functionality Oil Receiving Nano charge Phase Atomize bath capsule Formula neutralization by Biocompatible Volume Emulsify by Diameter Osmolality Design Name condensor Surfactant Oil (%, 4.5 ml basis) sonication (μm) (mOs) 1 q.co.2 + Cetyl Castor 4 + 250 220 OH oil/Etoh 2 q.co — Cetyl Castor 4 + 250 220 OH oil/Etoh 3 o.35 + TM-diol DMSO 4 + 1.4 220 4 ea0.2 + TM-diol DMSO 4 — — 220 5 ea0.1 — TM-diol DMSO 4 — — 220 6 ed0.2 + TM-diol DMSO 0.05 — 250 220 7 ed0a.12.di + TM-diol DMSO 0.05 — 250 0 Transduction Nanocapsule Encapsulation Efficiency, (5 Nanocapsule Formula diameter (nm)* yield days, rat Design name n = 20 (%, mean ± SE) fibroblasts) 1 q.co.2 20 ± 3, rods 48.6 ± 11 87 ± 7% 2 q.co 12 ± 0.7, irregular 48.6 ± 2 71 ± 28% 3 o.35 17 ± 1.2, spheres 82.3 ± 7 (4) 86 ± 2% 4 ea0.2 24 ± 2, s/r 32 ± 10 72 ± 2% 5 ea0.1 36 ± 3, irregular 57 ± 2 85 ± 1% 6 ed0.2 39 ± 3, r/e 39 ± 5 96% 7 ed0a12.di 39 ± 3, ellipse 69 ± 2 100% - Aqueous dispersion of DNA condensates with poorly soluble surfactants in the inventive method produced average nanocapsule diameters under 50 nm. A 30 number of successful operating regimes were feasible with varying effects on encapsulation yield. In a cetyl alcohol/castor oil system, under condensation resulted in an average particle diameter increase from 20 to 12 nm (Table 1B: F1vs. F2). The same decrease in condenser weight ratio induced a particle size increase from 24 to 36 nm, while still maintaining nanocapsule functionality for trangene delivery, when using a TM-diol/DMSO surfactant system for initial micelle formation (Table 1B: F4 vs. F5). This finding teaches surfactant selection impacts final average nanocapsule diameters.
- Moderate energy input was removed (dropped probe sonication, atomization but kept bath sonication) during nanocapsule formation and resulted in functional particles with decreased yield (Table 1B: F3 vs. F4). This finding indicates that optimal nanocapsule production is not dependent on any spontaneous micro-emulsification process. Cosolvent phase volume was reduced from 4 weight percent to 500 ppm without any negative effect on particle functionality (Table 1B: F4 vs. F6). This finding indicates that essentially solvent-free nanocapsules can be made by the inventive method. Finally, salt was removed from the atomization receiving bath without any negative effects on nanocapsule functionality (Table 1B: F6 vs. F7).
- The effect of nanocapsule sizing on intracellular trafficking in immortalized HacaT human keratinocyte cultures (HacaT's) was investigated in this example. In this series of formulae, thee micellar dispersion were sheared by syringes of different orifice diameter. The coating weight was also lowered from 1:1 DNA:Polymer (w/w) to 1:40 to shorten the dissolution profile from 5 to 3 days. In these experiments, nanocapsule formulae were compared to standard polyplexes of DNA and PEI, and lipoplexed plasmid DNA. Table 2 summarizes the experimental design and results:
TABLE 2 Effect of particle size on nanocapsule functionality for gene transfer 4 hr. 4 hr. 10 hr. Transduction Particle Size colocalization colocalization colocalization Efficiency. Formula (mean, nm; with with with (5 days, human Name morphology) caveolin-l* cathrin lysosomes keratinocytes) o.22 (64) 47 ± 3, rods 0 ++ + 16 ± 13 o.27 (57) 21 ± 2, rods + + ND 81 ± 8 o.35 (85) 17 ± 1.2, spheres +++ 0 0 78 ± 9 pei- 67 ± 4, 0 +++ +++ 40 ± 15 pDNA spheres, irreg Lipoplex 48 ± 2 + + +++ 41 ± 27 pDNA 200 nm aggregates - It was observed that compared to the unstimulated state, nanocapsules increased cellular pinocytotic activity compared to standard formulations, and smaller nanocapsules shifted pinocytotic activity to caveolae from clathrin-coated pits (Table 2: Formula O vs. pei-dna and lipoplex pDNA). It was further observed that nanocapsules avoided lysosome co-localization at 10 hours post-addition with smaller nanocapsules being particularly effective (see Table 2: Formula vs. pei-dna and lipoplex pDNA). These results are illustrated further in FIG. 2. This improvement is further emphasized by comparison with published uptake studies for HacaT keratinocytes. Compared to primary keratinocytes, uptake of naked DNA oligonucleotides (20 μm) were very poor in HacaT's and showed accumulation of oligonucleotides in punctate vesicles consistent lysosomes at 2 hours. Using hydrophillic dispersed atomized nanocapsules of the inventive method, complete avoidance of lysosomes at 10 hours post-addition was demonstrated. These results indicate that products of the inventive process will have increased and prolonged effectiveness.
- To test whether soluble exogenous DNA released from liposomes or dendrimers induces apoptosis, Rt-1's were treated with loaded/unloaded liposome complexes, dendrimer complexes, nanoparticles and 1 μg/ml etoposide, a DNA intercalating agent as a positive control. Cultures were treated with standard formulas for 3 hours then assayed for
gene product expression 30 hours later. Cultures were treated with nanocapsules for 4 days to ensure full DNA release during the experiment. Controls included as a positive control for apoptotic cell death, 1 μg/ml etoposide, a DNA intercalating agent was applied to cultures overnight before experiment termination. Other controls included standard PEI-DNA complexes, empty nanocapsules and nanocapsules containing empty vector plasmid DNA. Hydrophillic nanoparticles were produced for this experiment as described earlier using a 35-gage syringe. - One of the later steps in apoptosis is DNA fragmentation mediated by activation of endonucleases during the apoptic program. Therefore, DNA fragmentation was assayed by end-labeling of fragments using an exogenous enzyme and a substituted nucleotide (TUNEL: tdt-mediated uridine nucleotide and labeling. Results are expressed as a Fragmentation Index, or the percent of cells in the total culture exhibiting BRDU end-labeled DNA. Cultures were run in duplicate. The experimental design and results are summarized in Table 3:
TABLE 3 Effect of nanocapsule coating weight on nonspecific reagent and plasmid DNA- associated cytoxicity. Formula κ.35 ζ ο(Omicron) b.35 Particle Design: DNA Condensing Denatured h. 100 Kd MW 27 kD 27 kD Agent keratinocyte Polylsine PEI PEI nuclear protein Coating Ratio 0.1 0.25 0.25 0.01 (DNA/polymer) Performance: dose: (30 hrs for Std. 4.6 4.1 4 5 Formulas, 100 hrs for nanocapsules) Cytotoxicity: ND 0.26 ± 0.15 2 ± 0.7 1.9 ± 0.6 (Fragmentation Index, %) cytotoxicity controls: (1 μg etoposide (8 hr): 25 ± 10%) (Pei- DNA polyplexes (100 hr): 24 ± 7%) (Empty vector nanocapsules: 1.25 ± 1.25%) (Empty vector nanocapsules: 0.9 ± 0.7%) Transduction 31 ± 2 ND 85 ± 7 32 ± 3 Efficiency: (% cells) 120 hrs, dose as listed) Formula Characteristics: Nucleic: Acid 55 ± 10 27 ± 7 54 ± 5 65 ± 4 Incorporation: (%) Cumulative Release: 70 75 ± 8 83 ± 12 ND (%, 48 hr) Particle Size (mean ± SE, 26 ± 2 22 ± 2 20 ± 1 35 ± 2 nm) Agglomerates (as few 50% 80 ± 6 200 nm 200 nm dispensed) Formula Y.35 Lipoplex GP Lipoplex L+ Polyplex Particle Design: DNA Condensing 27 kD cationic cationic dendrimer Agent PEI lipid lipid Coating Ratio 0.0025 (DNA/polymer) Performance: dose: (30 hrs for 5 1 μg 500 ng 2 μg Std. Formulas, 100 hrs 500 ng 250 ng 1 μg for 0 ng 0 ng 0 μg nanocapsules) Cytotoxicity: 9 ± 8 27 ± 8 9.3 ± 0.2 6.63 ± 1.4 (Fragmentation Index, %) cytotoxicity 6 ± 3 12.8 ± 1.5 5.7 ± 1.8 controls: 4 ± 2.5 7.8 ± 0.1 3.1 ± 0.3 (1 μg etoposide (8 hr): 25 ± 10%) (Pei-DNA polyplexes (100 hr): 24 ± 7%) (Empty vector nanocapsules: 1.25 ± 1.25%) (Empty vector nanocapsules: 0.9 ± 0.7%) Transduction 24 ± 4 17 ± 2 dead dead Efficiency: (% cells) 120 hrs, dose as listed) Formula Characteristics: Nucleic: Acid 667 ± 0.2 ND ND ND Incorporation: (%) Cumulative ND ND ND ND Release: (%, 48 hr) Particle Size 57 ± 5 48 ± 2 ND 22.4 ± 2 (mean ± SE, nm) Agglomerates (as g.t. 50% 300 nm 25% 300 nm dispensed) 300 nm hard-fused -
TABLE 3B Dose response of nanoencapsulated pDNA GFP/Actin Production Formula Dose (100 hr.) (density ratio, %) K.35 9 μg 94.8 K.35 4.5 μg 83.5 K.35 1.5 μg 83.3 Lipoplex GP o.5 μg 94.9 - It was observed that use of controlled-release nanocapsules reduced the fraction of apoptotic cells in
fibroblast cultures 3 to 100 fold. Conventional reagents without DNA showed a 4-fold increase in FI over empty nanoparticles, but increased another 50-100% without additional reagents in the presence of additional DNA. Decreasing the coating weight from 1:40 to 1:400 resulted in an increase in average nanocapsule diameter from 20 to 57 nm and the appearance of regions of apoptotic induction in cultures (Table 3: F omicron vs. F upsilon 35). Decreasing the coating weight from 1:40 to an intermediate 1:100 reduced transduction efficiency without increasing particle size and the appearance of cytotoxicity. These findings indicate that nanocapsule design plays a role in maintaining nanocapsule integrity and that size effects and dissolution profiles can contribute to observed cytotoxicity and functionality. We concluded that application of nanocapsule formulations increased dosing to useful efficiency levels without induction of an apoptotic program. - Table 3B exemplifies this improvement with a dose response of Formula K.35 measured in fibroblast lysates. GFP production was measured in fibroblast lysates after 4 days of treatment with increasing doses of nanocapsules. A 9.5 μg dose of nanocapsules equaled the production of a liposomal formulation without any evidence of cytotoxicity.
- The utility of nanocapsules for nonviral nucleic acid delivery to tissue in a pig biopsy organ culture system was investigated. 6 and 8 mm circular biopsies were collected under sterile conditions from sedated research animals and cultured on meshes in partial contact with media containing 20% Fetal Calf Serum. Biopsies were either injected with 90 μl (6.3 μg) or treated topically with 3×30 μl aliquots. Biopsies were snapfrozen 7 days later and sectioned/homogenized for β-galactosidase production measurement. Formulation information and results from this experiment are summarized in Table 4:
TABLE 4: Table 4: Functionality of dispersed atomized nanocapsules for macromolecule delivery across keratinized barrier membranes. Formula N O Exp. Modification coating wt. is 2.5x coating (from Formula Q) Polymer MW is 1x wt. is 2.5x Polymer MW is 4x Formula Characteristics: Nucleic Acid Incorporation (%) 70.00 70.50 Cumulative Release 83 83. ± 1.5 (%, 169 hr 2.5 μg sample Low MW DNA in postdigested 0 0 Electrophoresis Samples Supercoil retention 100% 100% (237 hr release, initial = 69.7% sc/releaxed) Particle Size (mean, SE, major 18.2 ± 0.2 nm ND species) Particle Description spherical Secondary structure: 20% 100 nm flocs Performance: Transduced Protein Production 312 ± 74 (topical) (pixel units, 142 (s.c.) % of neg control, 100 μg total protein, normalized by protein) Reporter ( gene Product 100% 100% Distribution (6.3 μg dose, 6 mm (N), 8 mm (O) porcine biopsy, 1 wk) keratinocytes (% cells), n = 2 73 ± 20 (pap) 13.8 ± 0.5 (pap) fields/200 cells, neg cntrl: 6% endothelial cells, (% vwf-+area) papillary and/or reticular, 32 ± 15 (ret) 8 ± 2 (ret) n = 2-4 fields, neg cntrl: 1.07 ± 0.72 dermis (% area); 2.74 ± 0.96* 1.77 ± 0.49* negative cntrl: 0.24 ± 0.03, n = 4/20x fields - Western blotting of radiated tissue lysates showed a 3-fold increase in β-galactosidase in duplicate biopsies treated topically with Formula N over an identically cultured 6mm biopsy treated with saline. Only a 2-fold increase was measured in a 8 mm biopsy treated topically with formula 0 nanoparticles (see FIG. 4B). Formula O was produced with a higher molecular weight analog of the N polymer suggesting a difference in particle morphology, a dose effect or differing in situ release profiles between the two formulations related to this difference. To identify initial cell type-specific differences in nanocapsule delivery effectiveness, tissue sections were analyzed for β-galactosidase expression in double-label experiments using antibodies to cell-specific epitopes (see FIG. 4B). Digital image analysis of these sections indicated that radiated keratinocytes and endothelial cells are readily transduced in
organ culture 7 days after treatment with a 10 day releasing formula. Specific quantitation of fibroblastic cells was not possible without inclusion of a cell-specific marker, however, an 11-fold increase in area of expression was measured in N biopsy dermis (see FIG. 4B). Interestingly, for both the formulae N and O topically-treated biopsies examined, the area percentage of blood vessels transduced decreased about 50% in nearby fields between 100 μm and 300 μm of depth (Table 4: papillary vs. reticular endothelial cells). These data suggest that nanocapsules are penetrating the epidermis to enter the dermis. - Nanocapsules containing a nuclear GFP transgene or empty vector were incorporated into a suture coating by vortexing the following components: i) 50 μg of nanocapsules containing plasmid DNA, ii) 200 μg of bovine mucin, and iii) 75 μg of sucrose (60% w/w) in a 1000 μl volume. Sutures were aseptically coated by drawing
sutures 5× through punctured microcentrifuge tubes. Coating functionality for gene transfer was tested by applying sutures in cultured porcine skin biopsies. Biopsies were cultured on a mesh such that the biopsy bottom was in contact with cell culture media. Biopsies were treated for 7 days, then snap-frozen and sectioned for immunofluorescence microscopy to assess nanocapsule penetration and transgene delivery. - Nanocapsule penetration was detected by streptavidin-biotin immunocomplexes directed at sheep IgG. Nanocapsule coatings are spiked with ovine IgG to enable this detection strategy. FIG. 5A shows distribution of sheep IgG signal throughout porcine dermal tissue with accumulation on capillaries. In FIG. 5A′, primary antibody is omitted during slide processing to determine level of background fluorescence. A suture is visible in this view. Sutures were identifiable as smooth objects without positive nuclear counterstain. GFP expression was confirmed using a polyclonal GFP antibody to obviate the effect of nonspecific tissue green fluorescence. FIG. 5B shows GFP expression throughout the suture-treated dermis using a GFP polyclonal antibody. A suture was visible 750 microns away. FIG. 5C shows the lack of GFP expression in a biopsy treated with empty vector coating. This example demonstrates the usefulness of nanocapsules for use in physically targeted macromolecule delivery.
- Fibroblast targeting
- GFP nanocapsules were prepared by dispersion atomization as described in Example 1. Polyvinylpyrylodone (PVP, MW 10,000) was used as the coating basis. A coating weight ratio of 1:40 was used and rod-shaped nanocapsules of 23±2 nm were produced. 1 μg of PVP nanocapsules were applied to both human dermal fibroblasts (HDF) and HacaT keratinocyte cultures for 4 hours then fixed for detection for nanocapsule uptake by streptavidin-bioting immunocomplexes to sheep IgG. Nanocapsule coatings are spiked with ovine IgG to enable this detection strategy. FIG. 6 illustrates positive nuclear localization of PVP nanocapsules in HDF's and negative colocalization of PVP nanocapsules in keratinocytes (FIG. 6:6 a vs. 6 b). Views of untreated cultures are included for comparison (6 a′, 6 b′). Cultures were also treated with 5 μg of PVP nanocapsules for 5 days then tested for GFP transgene production. Consistent with uptake studies results, only the fibroblast cultures showed production of GFP transgene (FIG. 6: 6 a″ vs. 6 b″).
- Tumor-targeting
- GFP nanocapsules were prepared by dispersion atomization as described in example 1. Tenascin (TN, MW 200,000) was used as the coating basis. A coating weight ratio of 1:20 was used and spherical nanocapsules of 19±0.9 nm were produced. 500 ng of TN nanocapsules were applied topically in successive small aliquots to pig biopsies maintained in organ culture. Biopsies were rinsed in media after 3 minutes of topical application and culture media was changed to preclude any delivery other than topical.
- To simulate tumor nests of epithelial-derived origin, biopsies had been seeded 12 hours previously with 50,000 human squamous carcinoma cells. 7 days later biopsies were snapfrozen and sectioned for immunological detection of GFP production. In FIG. 6B, view “a” shows intense GFP fluorescence in the tumor center, view “b” confirms this GFP expression with polyclonal antibodies to GFP, view “c” shows cell positioning in the section using a counterstain for cell nuclei and view “d” shows the level of background fluorescence by omission of GFP antibodies. Tumor origin was confirmed by positive detection with antibody to
keratin 10/1, an epithelial marker. Comparison of view “b” and view “c” indicates that GFP expression is limited to cells within the tumor. As already demonstrated in example 5, expression throughout a tissue is also feasible and can modulated by coating design. This example demonstrates that nanocapsule delivery can be productively targeted. - Cell-specific delivery for enhanced drug therapeutic window
- Nanocapsules were prepared as described in Example 1 to encapsulate cisplatin, a hydrophobic molecule and a common cancer chemotherapeutic with serious side effects. A coating weight ratio of 1:100 was used and irregular nanocapsules of 29±3 nm were produced. Targeting efficacy was demonstrated by changes in the dose response for cell growth inhibition in fibroblast vs. squamous cell carcinoma cultures. Cells were seeded overnight into 96 well plates, treated for 18 hours with increasing amounts of encapsulated or unencapsulated drug, then assessed for cell growth inhibition using an
MTT assay 48 hours later for total growth time of 72 hours. Results are illustrated in FIG. 6C. The data shows that tenascin nanocapsules protected nontarget cells from cell death (zero death) at drug levels that killed using unencapsulated drug (FIG. 6Aa: open vs. closed circles). In carcinoma cultures, TN nanocapsules productively decreased the inhibition concentration (IC50) an estimated 300% from 525 to 160 μg/ml. Example 6 demonstrates the usefulness of nanocapsules for use in coating-targeted macromolecule delivery. - Nanocapsules containing either 500 kD Fitc-labelled dextran, 20 mer Fitc-labelled mer O-methylated RNA oligonucleotide and 16 mer phosphodiester DNA oligonucleotide were prepared as described in Example 1. A 1:40 coating weight ratio was used and 1 MM kD hyaluronan was used a coating basis. PEI was used to condense the phosphodiester DNA oligonucleotide, but no PEI was included in the dextran or RNA oligonucleotide formulas. Nanocapsule functionality for drug delivery was tested by evaluating changes in relative pinocytotic activity and cellular uptake in 35 mm cultures of human dermal fibroblast. Nanocapsule formulas were compared to naked species or species formulated as complexes. Quantitative results are summarized in Table 7.
TABLE 6 Nanoencapsulation improves cellular uptake of other species used as pharmaceutical, nutraceutical, research or cosmetic agents. At 18 hours post-addition, lysosomes are only evident in conventionally formulated species. 4.5 hours post-addition 18 hours post-addition Increase in cellular Bioactive uptake activity, Nuclear component (% cells above Uptake Colocalization with Detection Particle size baseline, Efficiency lysosomes, persistence Bioactive (mean, SE, nm, caveolin-l/clathrin) (% cells, (% cells, human (% cell, human Component Formulation morphology) dose fibroblast) fibroblasts) fibroblast) 500 kd nanocapsule 22 ± 2, s/r 89/20 25 μg* 95 ± 2 2 ± 2 5 μg 88 ± 11 flic-dextran naked, Fitclabelled — 75/18 100 μg 10 100 ± 10 100 μg 61 ± 20 20 mer o- nanocapsule 13 ± 0.7, r 78/90 2 μg 74 ± 5 0 ± 0 5 μg 80 ± 6 methylated naked, Fitclabelled — —/73 5 μg 14 ± 7 — — RNA oligo PEI/Fitclabelled 236 ± 26, r —/— — — 100 ± 0 5 μg 94 ± 10 16 mer PO nanocapsule 17 ± 1, r 70/94 1 μg 34 ± 25 0 ± 0 5 μg 91 ± 8 DNA oligo PEI/Fitclabelled 67 ± 4, s/ r 72% 2 μg 95 ± 2 80 ± 7 5 μg 66 lysosomes Nominal n 20 particles 70 cells 140 cells 50 cells 50 cells - Table 7 shows that average diameters for all nanocapsules were below 50 nm by AFM. PEI complexes of DNA oligonucleotides were measured at 67 nm and PEI complexes of uncharged RNA O-methyl oligonucleotides were measured at 236 nm. As discussed in Example 2 using keratinocyte cultures and plasmid DNA, nanocapsules stimulate pinocytotic activity as indicated by increased signal levels of clathrin and caveolin-1. In the 500 kD dextran case, pinocytotic activity shifts productively towards caveolae with nanoencapsulation (Table 7, 500 kD Dextran). At 4.5 hours post-addition, nuclear uptake is enhanced for encapsulated dextran and RNA relative to naked species. For the nanocapsules of DNA oligonucleotides, cellular uptake is decreased relative to complexed oligonucelotide, however, a majority of that DNA oligonucleotides is already nonproductively sequestered in lysosomes by that 4.5 hours (Table 7). At 18 hours post-addition, nanocapsules species show continued exclusion from lysosomes, while naked species show high levels of sequestration. These results are illustrated in FIG. 7A and 7B. Views “a” and “b” show Fitc detection in cultures at 18 hours. That distribution is exclusively nuclear for the nanoencapsules of RNA oligonucelotides (FIG. 7B: a vs. a′). Punctate inclusion are visible in the cultures treated with the complexed RNA oligonucleotides that co-localize with an immunological marker for lysosomes (FIG. 7A: a vs. a′). Particle sizing results from AFM microscopy are included to demonstrate dramatic difference in sizing following encapsulation. (FIG. 7A,7B:b vs.b, b′). Formulas encapsulating lower molecular weight dextrans and unstabilized RNA were also prepared with analagous uptake, nanocapsule size and yield to demonstrate that encapsulation can provide not only a targeting function but aid in stabilizing molecules sensitive to chemical or enzymatic degradation. These examples demonstrates the usefulness of
nanocapsules 36 for use in delivery of a broad range of macromolecules. - Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention.
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1 5 1 6232 DNA Artificial Sequence Supplied by Invitrogen of Carlsbad, California 1 gtaccgaatt caagcttcgt gaggctccgg tgcccgtcag tgggcagagc gcacatcgcc 60 cacagtcccc gagaagttgg ggggaggggt cggcaattga accggtgcct agagaaggtg 120 gcgcggggta aactgggaaa gtgatgtcgt gtactggctc cgcctttttc ccgagggtgg 180 gggagaaccg tatataagtg cagtagtcgc cgtgaacgtt ctttttcgca acgggtttgc 240 cgccagaaca caggtaagtg ccgtgtgtgg ttcccgcggg cctggcctct ttacgggtta 300 tggcccttgc gtgccttgaa ttacttccac ctggctccag tacgtgattc ttgatcccga 360 gctggagcca ggggcgggcc ttgcgcttta ggagcccctt cgcctcgtgc ttgagttgag 420 gcctggcctg ggcgctgggg ccgccgcgtg cgaatctggt ggcaccttcg cgcctgtctc 480 gctgctttcg ataagtctct agccatttaa aatttttgat gacctgctgc gacgcttttt 540 ttctggcaag atagtcttgt aaatgcgggc caggatctgc acactggtat ttcggttttt 600 gggcccgcgg ccggcgacgg ggcccgtgcg tcccagcgca catgttcggc gaggcggggc 660 ctgcgagcgc ggccaccgag aatcggacgg gggtagtctc aagctggccg gcctgctctg 720 gtgcctggcc tcgcgccgcc gtgtatcgcc ccgccctggg cggcaaggct ggcccggtcg 780 gcaccagttg cgtgagcgga aagatggccg cttcccggcc ctgctccagg gggctcaaaa 840 tggaggacgc ggcgctcggg agagcgggcg ggtgagtcac ccacacaaag gaaaagggcc 900 tttccgtcct cagccgtcgc ttcatgtgac tccacggagt accgggcgcc gtccaggcac 960 ctcgattagt tctggagctt ttggagtacg tcgtctttag gttgggggga ggggttttat 1020 gcgatggagt ttccccacac tgagtgggtg gagactgaag ttaggccagc ttggcacttg 1080 atgtaattct ccttggaatt tggccttttt gagtttggat cttggttcat tctcaagcct 1140 cagacagtgg ttcaaagttt ttttcttcca tttcaggtgt cgtgaacacg tggccaccat 1200 ggcccaggtg cagctgcaga tggctagcaa aggagaagaa cttttcactg gagttgtccc 1260 aattcttgtt gaattagatg gtgatgttaa tgggcacaaa ttttctgtca gtggagaggg 1320 tgaaggtgat gctacatacg gaaagcttac ccttaaattt atttgcacta ctggaaaact 1380 acctgttcca tggccaacac ttgtcactac tttctcttat ggtgttcaat gcttttcccg 1440 ttatccggat catatgaaac ggcatgactt tttcaagagt gccatgcccg aaggttatgt 1500 acaggaacgc actatatctt tcaaagatga cgggaactac aagacgcgtg ctgaagtcaa 1560 gtttgaaggt gatacccttg ttaatcgtat cgagttaaaa ggtattgatt ttaaagaaga 1620 tggaaacatt ctcggacaca aactcgagta caactataac tcacacaatg tatacatcac 1680 ggcagacaaa caaaagaatg gaatcaaagc taacttcaaa attcgccaca acattgaaga 1740 tggatccgtt caactagcag accattatca acaaaatact ccaattggcg atggccctgt 1800 ccttttacca gacaaccatt acctgtcgac acaatctgcc ctttcgaaag atcccaacga 1860 aaagcgtgac cacatggtcc ttcttgagtt tgtaactgct gctgggatta cacatggcat 1920 ggatgagctc tacaaagcgg ccgcagatcc aaaaaagaag agaaaggtag atccaaaaaa 1980 gaagagaaag gtagatccaa aaaagaagag aaaggtagat acggccgcag aacaaaaact 2040 catctcagaa gaggatctga atggggccgc atagtctaga agctcgctga tcagcctcga 2100 ctgtgccttc tagttgccag ccatctgttg tttgcccctc ccccgtgcct tccttgaccc 2160 tggaaggtgc cactcccact gtcctttcct aataaaatga ggaaattgca tcgcattgtc 2220 tgagtaggtg tcattctatt ctggggggtg gggtggggca ggacagcaag ggggaggatt 2280 gggaagacaa tagcaggcat gctggggatg gcccgggctc tatggcttct gaggcggaaa 2340 gaaccagctg gggctctagg gggtatcccc acgcgccctg tagcggcgca ttaagcgcgg 2400 cgggtgtggt ggttacgcgc agcgtgaccg ctacacttgc cagcgcccta gcgcccgctc 2460 ctttcgcttt cttcccttcc tttctcgcca cgttcgccgg ctttccccgt caagctctaa 2520 atcggggcat ccctttaggg ttccgattta gtgctttacg gcacctcgac cccaaaaaac 2580 ttgattaggg tgatggttca cgtagtgggc catcgccctg atagacggtt tttcgccctt 2640 tgacgttgga gtccacgttc tttaatagtg gactcttgtt ccaaactgga acaacactca 2700 accctatctc ggtctattct tttgatttat aagggatttt ggggatttcg gcctattggt 2760 taaaaaatga gctgatttaa caaaaattta acgcgaatta attctgtgga atgtgtgtca 2820 gttagggtgt ggaaagtccc caggctcccc aggcaggcag aagtatgcaa agcatgcatc 2880 tcaattagtc agcaaccagg tgtggaaagt ccccaggctc cccagcaggc agaagtatgc 2940 aaagcatgca tctcaattag tcagcaacca tagtcccgcc cctaactccg cccatcccgc 3000 ccctaactcc gcccagttcc gcccattctc cgcccctagg ctgactaatt ttttttattt 3060 atgcagaggc cgaggccgcc tctgcctctg agctattcca gaagtagtga ggaggctttt 3120 ttggaggcct aggcttttgc aaaaagctcc cgggaggtcc acaatgattg aacaagatgg 3180 attgcacgca ggttctccgg ccgcttgggt ggagaggcta ttcggctatg actgggcaca 3240 acagacaatc ggctgctctg atgccgccgt gttccggctg tcagcgcagg ggcgcccggt 3300 tctttttgtc aagaccgacc tgtccggtgc cctgaatgaa ctccaggacg aggcagcgcg 3360 gctatcgtgg ctggccacga cgggcgttcc ttgcgcagct gtgctcgacg ttgtcactga 3420 agcgggaagg gactggctgc tattgggcga agtgccgggg caggatctcc tgtcatctca 3480 ccttgctcct gccgagaaag tatccatcat ggctgatgca atgcggcggc tgcatacgct 3540 tgatccggct acctgcccat tcgaccacca agcgaaacat cgcatcgagc gagcacgtac 3600 tcggatggaa gccggtcttg tcgatcagga tgatctggac gaagagcatc aggggctcgc 3660 gccagccgaa ctgttcgcca ggctcaaggc gcgtatgccc gacggcgagg atctcgtcgt 3720 gactcatggc gatgcctgct tgccgaatat catggtggaa aatggccgct tttctggatt 3780 catcgactgt ggccggctgg gtgtggcgga ccgctatcag gacatagcgt tggctacccg 3840 tgatattgct gaagagcttg gcggcgaatg ggctgaccgc ttcctcgtgc tttacggtat 3900 cgccgctccc gattcgcagc gcatcgcctt ctatcgcctt cttgacgagt tcttctgagc 3960 gggactctgg ggttcgaaat gaccgaccaa gcgacgccca acctgccatc acgagatttc 4020 gattccaccg ccgccttcta tgaaaggttg ggcttcggaa tcgttttccg ggacgccggc 4080 tggatgatcc tccagcgcgg ggatctcatg ctggagttct tcgcccaccc caacttgttt 4140 attgcagctt ataatggtta caaataaagc aatagcatca caaatttcac aaataaagca 4200 tttttttcac tgcattctag ttgtggtttg tccaaactca tcaatgtatc ttatcatgtc 4260 tgtataccgg atctttccgc ttcctcgctc actgactcgc tgcgctcggt cgttcggctg 4320 cggcgagcgg tatcagctca ctcaaaggcg gtaatacggt tatccacaga atcaggggat 4380 aacgcaggaa agaacatgtg agcaaaaggc cagcaaaagg ccaggaaccg taaaaaggcc 4440 gcgttgctgg cgtttttcca taggctccgc ccccctgacg agcatcacaa aaatcgacgc 4500 tcaagtcaga ggtggcgaaa cccgacagga ctataaagat accaggcgtt tccccctgga 4560 agctccctcg tgcgctctcc tgttccgacc ctgccgctta ccggatacct gtccgccttt 4620 ctcccttcgg gaagcgtggc gctttctcaa tgctcacgct gtaggtatct cagttcggtg 4680 taggtcgttc gctccaagct gggctgtgtg cacgaacccc ccgttcagcc cgaccgctgc 4740 gccttatccg gtaactatcg tcttgagtcc aacccggtaa gacacgactt atcgccactg 4800 gcagcagcca ctggtaacag gattagcaga gcgaggtatg taggcggtgc tacagagttc 4860 ttgaagtggt ggcctaacta cggctacact agaaggacag tatttggtat ctgcgctctg 4920 ctgaagccag ttaccttcgg aaaaagagtt ggtagctctt gatccggcaa acaaaccacc 4980 gctggtagcg gtggtttttt tgtttgcaag cagcagatta cgcgcagaaa aaaaggatct 5040 caagaagatc ctttgatctt ttctacgggg tctgacgctc agtggaacga aaactcacgt 5100 taagggattt tggtcatgag attatcaaaa aggatcttca cctagatcct tttaaattaa 5160 aaatgaagtt ttaaatcaat ctaaagtata tatgagtaaa cttggtctga cagttaccaa 5220 tgcttaatca gtgaggcacc tatctcagcg atctgtctat ttcgttcatc catagttgcc 5280 tgactccccg tcgtgtagat aactacgata cgggagggct taccatctgg ccccagtgct 5340 gcaatgatac cgcgagaccc acgctcaccg gctccagatt tatcagcaat aaaccagcca 5400 gccggaaggg ccgagcgcag aagtggtcct gcaactttat ccgcctccat ccagtctatt 5460 aattgttgcc gggaagctag agtaagtagt tcgccagtta atagtttgcg caacgttgtt 5520 gccattgcta caggcatcgt ggtgtcacgc tcgtcgtttg gtatggcttc attcagctcc 5580 ggttcccaac gatcaaggcg agttacatga tcccccatgt tgtgcaaaaa agcggttagc 5640 tccttcggtc ctccgatcgt tgtcagaagt aagttggccg cagtgttatc actcatggtt 5700 atggcagcac tgcataattc tcttactgtc atgccatccg taagatgctt ttctgtgact 5760 ggtgagtact caaccaagtc attctgagaa tagtgtatgc ggcgaccgag ttgctcttgc 5820 ccggcgtcaa tacgggataa taccgcgcca catagcagaa ctttaaaagt gctcatcatt 5880 ggaaaacgtt cttcggggcg aaaactctca aggatcttac cgctgttgag atccagttcg 5940 atgtaaccca ctcgtgcacc caactgatct tcagcatctt ttactttcac cagcgtttct 6000 gggtgagcaa aaacaggaag gcaaaatgcc gcaaaaaagg gaataagggc gacacggaaa 6060 tgttgaatac tcatactctt cctttttcaa tattattgaa gcatttatca gggttattgt 6120 ctcatgagcg gatacatatt tgaatgtatt tagaaaaata aacaaatagg ggttccgcgc 6180 acatttcccc gaaaagtgcc acctgacgtc agatcgacgg atcgggagat cg 6232 2 2200 PRT Homo sapiens 2 Met Gly Ala Met Thr Gln Leu Leu Ala Gly Val Phe Leu Ala Phe Leu 1 5 10 15 Ala Leu Ala Thr Glu Gly Gly Val Leu Lys Lys Val Ile Arg His Lys 20 25 30 Arg Gln Ser Gly Val Asn Ala Thr Leu Pro Glu Glu Asn Gln Pro Val 35 40 45 Val Phe Asn His Val Tyr Asn Ile Lys Leu Pro Val Gly Ser Gln Cys 50 55 60 Ser Val Asp Leu Glu Ser Ala Ser Gly Glu Lys Asp Leu Ala Pro Pro 65 70 75 80 Ser Glu Pro Ser Glu Ser Phe Gln Glu His Thr Val Asp Gly Glu Asn 85 90 95 Gln Ile Val Phe Thr His Arg Ile Asn Ile Pro Arg Arg Ala Cys Gly 100 105 110 Cys Ala Ala Ala Pro Asp Val Lys Glu Leu Leu Ser Arg Leu Glu Glu 115 120 125 Leu Glu Asn Leu Val Ser Ser Leu Arg Glu Gln Cys Thr Ala Gly Ala 130 135 140 Gly Cys Cys Leu Gln Pro Ala Thr Gly Arg Leu Asp Thr Arg Pro Phe 145 150 155 160 Cys Ser Gly Arg Gly Asn Phe Ser Thr Glu Gly Cys Gly Cys Val Cys 165 170 175 Glu Pro Gly Trp Lys Gly Pro Asn Cys Ser Glu Pro Glu Cys Pro Gly 180 185 190 Asn Cys His Leu Arg Gly Arg Cys Ile Asp Gly Gln Cys Ile Cys Asp 195 200 205 Asp Gly Phe Thr Gly Glu Asp Cys Ser Gln Leu Ala Cys Pro Ser Asp 210 215 220 Cys Asn Asp Gln Gly Lys Cys Val Asn Gly Val Cys Ile Cys Phe Glu 225 230 235 240 Gly Tyr Ala Gly Ala Asp Cys Ser Arg Glu Ile Cys Pro Val Pro Cys 245 250 255 Ser Glu Glu His Gly Thr Cys Val Asp Gly Leu Cys Val Cys His Asp 260 265 270 Gly Phe Ala Gly Asp Asp Cys Asn Lys Pro Leu Cys Leu Asn Asn Cys 275 280 285 Tyr Asn Arg Gly Arg Cys Val Glu Asn Glu Cys Val Cys Asp Glu Gly 290 295 300 Phe Thr Gly Glu Asp Cys Ser Glu Leu Ile Cys Pro Asn Asp Cys Phe 305 310 315 320 Asp Arg Gly Arg Cys Ile Asn Gly Thr Cys Tyr Cys Glu Glu Gly Phe 325 330 335 Thr Gly Glu Asp Cys Gly Lys Pro Thr Cys Pro His Ala Cys His Thr 340 345 350 Gln Gly Arg Cys Glu Glu Gly Gln Cys Val Cys Asp Glu Gly Phe Ala 355 360 365 Gly Leu Asp Cys Ser Glu Lys Arg Cys Pro Ala Asp Cys His Asn Arg 370 375 380 Gly Arg Cys Val Asp Gly Arg Cys Glu Cys Asp Asp Gly Phe Thr Gly 385 390 395 400 Ala Asp Cys Gly Glu Leu Lys Cys Pro Asn Gly Cys Ser Gly His Gly 405 410 415 Arg Cys Val Asn Gly Gln Cys Val Cys Asp Glu Gly Tyr Thr Gly Glu 420 425 430 Asp Cys Ser Gln Leu Arg Cys Pro Asn Asp Cys His Ser Arg Gly Arg 435 440 445 Cys Val Glu Gly Lys Cys Val Cys Glu Gln Gly Phe Lys Gly Tyr Asp 450 455 460 Cys Ser Asp Met Ser Cys Pro Asn Asp Cys His Gln His Gly Arg Cys 465 470 475 480 Val Asn Gly Met Cys Val Cys Asp Asp Gly Tyr Thr Gly Glu Asp Cys 485 490 495 Arg Asp Arg Gln Cys Pro Arg Asp Cys Ser Asn Arg Gly Leu Cys Val 500 505 510 Asp Gly Gln Cys Val Cys Glu Asp Gly Phe Thr Gly Pro Asp Cys Ala 515 520 525 Glu Leu Ser Cys Pro Asn Asp Cys His Gly Gln Gly Arg Cys Val Asn 530 535 540 Gly Gln Cys Val Cys His Glu Gly Phe Met Gly Lys Asp Cys Lys Glu 545 550 555 560 Gln Arg Cys Pro Ser Asp Cys His Gly Gln Gly Arg Cys Val Asp Gly 565 570 575 Gln Cys Ile Cys His Glu Gly Phe Thr Gly Leu Asp Cys Gly Gln His 580 585 590 Ser Cys Pro Ser Asp Cys Asn Asn Leu Gly Gln Cys Val Ser Gly Arg 595 600 605 Cys Ile Cys Asn Glu Gly Tyr Ser Gly Glu Asp Cys Ser Glu Val Ser 610 615 620 Pro Pro Lys Asp Leu Val Val Thr Glu Val Thr Glu Glu Thr Val Asn 625 630 635 640 Leu Ala Trp Asp Asn Glu Met Arg Val Thr Glu Tyr Leu Val Val Tyr 645 650 655 Thr Pro Thr His Glu Gly Gly Leu Glu Met Gln Phe Arg Val Pro Gly 660 665 670 Asp Gln Thr Ser Thr Ile Ile Gln Glu Leu Glu Pro Gly Val Glu Tyr 675 680 685 Phe Ile Arg Val Phe Ala Ile Leu Glu Asn Lys Lys Ser Ile Pro Val 690 695 700 Ser Ala Arg Val Ala Thr Tyr Leu Pro Ala Pro Glu Gly Leu Lys Phe 705 710 715 720 Lys Ser Ile Lys Glu Thr Ser Val Glu Val Glu Trp Asp Pro Leu Asp 725 730 735 Ile Ala Phe Glu Thr Trp Glu Ile Ile Phe Arg Asn Met Asn Lys Glu 740 745 750 Asp Glu Gly Glu Ile Thr Lys Ser Leu Arg Arg Pro Glu Thr Ser Tyr 755 760 765 Arg Gln Thr Gly Leu Ala Pro Gly Gln Glu Tyr Glu Ile Ser Leu His 770 775 780 Ile Val Lys Asn Asn Thr Arg Gly Pro Gly Leu Lys Arg Val Thr Thr 785 790 795 800 Thr Arg Leu Asp Ala Pro Ser Gln Ile Glu Val Lys Asp Val Thr Asp 805 810 815 Thr Thr Ala Leu Ile Thr Trp Phe Lys Pro Leu Ala Glu Ile Asp Gly 820 825 830 Ile Glu Leu Thr Tyr Gly Ile Lys Asp Val Pro Gly Asp Arg Thr Thr 835 840 845 Ile Asp Leu Thr Glu Asp Glu Asn Gln Tyr Ser Ile Gly Asn Leu Lys 850 855 860 Pro Asp Thr Glu Tyr Glu Val Ser Leu Ile Ser Arg Arg Gly Asp Met 865 870 875 880 Ser Ser Asn Pro Ala Lys Glu Thr Phe Thr Thr Gly Leu Asp Ala Pro 885 890 895 Arg Asn Leu Arg Arg Val Ser Gln Thr Asp Asn Ser Ile Thr Leu Glu 900 905 910 Trp Arg Asn Gly Lys Ala Ala Ile Asp Ser Tyr Arg Ile Lys Tyr Ala 915 920 925 Pro Ile Ser Gly Gly Asp His Ala Glu Val Asp Val Pro Lys Ser Gln 930 935 940 Gln Ala Thr Thr Lys Thr Thr Leu Thr Gly Leu Arg Pro Gly Thr Glu 945 950 955 960 Tyr Gly Ile Gly Val Ser Ala Val Lys Glu Asp Lys Glu Ser Asn Pro 965 970 975 Ala Thr Ile Asn Ala Ala Thr Glu Leu Asp Thr Pro Lys Asp Leu Gln 980 985 990 Val Ser Glu Thr Ala Glu Thr Ser Leu Thr Leu Leu Trp Lys Thr Pro 995 1000 1005 Leu Ala Lys Phe Asp Arg Tyr Arg Leu Asn Tyr Ser Leu Pro Thr 1010 1015 1020 Gly Gln Trp Val Gly Val Gln Leu Pro Arg Asn Thr Thr Ser Tyr 1025 1030 1035 Val Leu Arg Gly Leu Glu Pro Gly Gln Glu Tyr Asn Val Leu Leu 1040 1045 1050 Thr Ala Glu Lys Gly Arg His Lys Ser Lys Pro Ala Arg Val Lys 1055 1060 1065 Ala Ser Thr Glu Gln Ala Pro Glu Leu Glu Asn Leu Thr Val Thr 1070 1075 1080 Glu Val Gly Trp Asp Gly Leu Arg Leu Asn Trp Thr Ala Ala Asp 1085 1090 1095 Gln Ala Tyr Glu His Phe Ile Ile Gln Val Gln Glu Ala Asn Lys 1100 1105 1110 Val Glu Ala Ala Arg Asn Leu Thr Val Pro Gly Ser Leu Arg Ala 1115 1120 1125 Val Asp Ile Pro Gly Leu Lys Ala Ala Thr Pro Tyr Thr Val Ser 1130 1135 1140 Ile Tyr Gly Val Ile Gln Gly Tyr Arg Thr Pro Val Leu Ser Ala 1145 1150 1155 Glu Ala Ser Thr Gly Glu Thr Pro Asn Leu Gly Glu Val Val Val 1160 1165 1170 Ala Glu Val Gly Trp Asp Ala Leu Lys Leu Asn Trp Thr Ala Pro 1175 1180 1185 Glu Gly Ala Tyr Glu Tyr Phe Phe Ile Gln Val Gln Glu Ala Asp 1190 1195 1200 Thr Val Glu Ala Ala Gln Asn Leu Thr Val Pro Gly Gly Leu Arg 1205 1210 1215 Ser Thr Asp Leu Pro Gly Leu Lys Ala Ala Thr His Tyr Thr Ile 1220 1225 1230 Thr Ile Arg Gly Val Thr Gln Asp Phe Ser Thr Thr Pro Leu Ser 1235 1240 1245 Val Glu Val Leu Thr Glu Glu Val Pro Asp Met Gly Asn Leu Thr 1250 1255 1260 Val Thr Glu Val Ser Trp Asp Ala Leu Arg Leu Asn Trp Thr Thr 1265 1270 1275 Pro Asp Gly Thr Tyr Asp Gln Phe Thr Ile Gln Val Gln Glu Ala 1280 1285 1290 Asp Gln Val Glu Glu Ala His Asn Leu Thr Val Pro Gly Ser Leu 1295 1300 1305 Arg Ser Met Glu Ile Pro Gly Leu Arg Ala Gly Thr Pro Tyr Thr 1310 1315 1320 Val Thr Leu His Gly Glu Val Arg Gly His Ser Thr Arg Pro Leu 1325 1330 1335 Ala Val Glu Val Val Thr Glu Asp Leu Pro Gln Leu Gly Asp Leu 1340 1345 1350 Ala Val Ser Glu Val Gly Trp Asp Gly Leu Arg Leu Asn Trp Thr 1355 1360 1365 Ala Ala Asp Asn Ala Tyr Glu His Phe Val Gln Val Gln Glu Val 1370 1375 1380 Asn Lys Val Glu Ala Ala Gln Asn Leu Thr Leu Pro Gly Ser Leu 1385 1390 1395 Arg Ala Val Asp Ile Pro Gly Leu Glu Ala Ala Thr Pro Tyr Arg 1400 1405 1410 Val Ser Ile Tyr Gly Val Ile Arg Gly Tyr Arg Thr Pro Val Leu 1415 1420 1425 Ser Ala Glu Ala Ser Thr Ala Lys Glu Pro Glu Ile Gly Asn Leu 1430 1435 1440 Asn Val Ser Asp Ile Thr Pro Glu Ser Phe Asn Leu Ser Trp Met 1445 1450 1455 Ala Thr Asp Gly Ile Phe Glu Thr Phe Thr Ile Glu Ile Ile Asp 1460 1465 1470 Ser Asn Arg Leu Leu Glu Thr Val Glu Tyr Asn Ile Ser Gly Ala 1475 1480 1485 Glu Arg Thr Ala His Ile Ser Gly Leu Pro Pro Ser Thr Asp Phe 1490 1495 1500 Ile Val Tyr Leu Ser Gly Leu Ala Pro Ser Ile Arg Thr Lys Thr 1505 1510 1515 Ile Ser Ala Thr Ala Thr Thr Glu Ala Leu Pro Leu Leu Glu Asn 1520 1525 1530 Leu Thr Ile Ser Asp Ile Asn Pro Tyr Gly Phe Thr Val Ser Trp 1535 1540 1545 Met Ala Ser Glu Asn Ala Phe Asp Ser Phe Leu Val Thr Val Val 1550 1555 1560 Asp Ser Gly Lys Leu Leu Asp Pro Gln Glu Phe Thr Leu Ser Gly 1565 1570 1575 Thr Gln Arg Lys Leu Glu Leu Arg Gly Leu Ile Thr Gly Ile Gly 1580 1585 1590 Tyr Glu Val Met Val Ser Gly Phe Thr Gln Gly His Gln Thr Lys 1595 1600 1605 Pro Leu Arg Ala Glu Ile Val Thr Glu Ala Glu Pro Glu Val Asp 1610 1615 1620 Asn Leu Leu Val Ser Asp Ala Thr Pro Asp Gly Phe Arg Leu Ser 1625 1630 1635 Trp Thr Ala Asp Glu Gly Val Phe Asp Asn Phe Val Leu Lys Ile 1640 1645 1650 Arg Asp Thr Lys Lys Gln Ser Glu Pro Leu Glu Ile Thr Leu Leu 1655 1660 1665 Ala Pro Glu Arg Thr Arg Asp Leu Thr Gly Leu Arg Glu Ala Thr 1670 1675 1680 Glu Tyr Glu Ile Glu Leu Tyr Gly Ile Ser Lys Gly Arg Arg Ser 1685 1690 1695 Gln Thr Val Ser Ala Ile Ala Thr Thr Ala Met Gly Ser Pro Lys 1700 1705 1710 Glu Val Ile Phe Ser Asp Ile Thr Glu Asn Ser Ala Thr Val Ser 1715 1720 1725 Trp Arg Ala Pro Thr Ala Gln Val Glu Ser Phe Arg Ile Thr Tyr 1730 1735 1740 Val Pro Ile Thr Gly Gly Thr Pro Ser Met Val Thr Val Asp Gly 1745 1750 1755 Thr Lys Thr Gln Thr Arg Leu Val Lys Leu Ile Pro Gly Val Glu 1760 1765 1770 Tyr Leu Val Ser Ile Ile Ala Met Lys Gly Phe Glu Glu Ser Glu 1775 1780 1785 Pro Val Ser Gly Ser Phe Thr Thr Ala Leu Asp Gly Pro Ser Gly 1790 1795 1800 Leu Val Thr Ala Asn Ile Thr Asp Ser Glu Ala Leu Ala Arg Trp 1805 1810 1815 Gln Pro Ala Ile Ala Thr Val Asp Ser Tyr Val Ile Ser Tyr Thr 1820 1825 1830 Gly Glu Lys Val Pro Glu Ile Thr Arg Thr Val Ser Gly Asn Thr 1835 1840 1845 Val Glu Tyr Ala Leu Thr Asp Leu Glu Pro Ala Thr Glu Tyr Thr 1850 1855 1860 Leu Arg Ile Phe Ala Glu Lys Gly Pro Gln Lys Ser Ser Thr Ile 1865 1870 1875 Thr Ala Lys Phe Thr Thr Asp Leu Asp Ser Pro Arg Asp Leu Thr 1880 1885 1890 Ala Thr Glu Val Gln Ser Glu Thr Ala Leu Leu Thr Trp Arg Pro 1895 1900 1905 Pro Arg Ala Ser Val Thr Gly Tyr Leu Leu Val Tyr Glu Ser Val 1910 1915 1920 Asp Gly Thr Val Lys Glu Val Ile Val Gly Pro Asp Thr Thr Ser 1925 1930 1935 Tyr Ser Leu Ala Asp Leu Ser Pro Ser Thr His Tyr Thr Ala Lys 1940 1945 1950 Ile Gln Ala Leu Asn Gly Pro Leu Arg Ser Asn Met Ile Gln Thr 1955 1960 1965 Ile Phe Thr Thr Ile Gly Leu Leu Tyr Pro Phe Pro Lys Asp Cys 1970 1975 1980 Ser Gln Ala Met Leu Asn Gly Asp Thr Thr Ser Gly Leu Tyr Thr 1985 1990 1995 Ile Tyr Leu Asn Gly Asp Lys Ala Gln Ala Leu Glu Val Phe Cys 2000 2005 2010 Asp Met Thr Ser Asp Gly Gly Gly Trp Ile Val Phe Leu Arg Arg 2015 2020 2025 Lys Asn Gly Arg Glu Asn Phe Tyr Gln Asn Trp Lys Ala Tyr Ala 2030 2035 2040 Ala Gly Phe Gly Asp Arg Arg Glu Glu Phe Trp Leu Gly Leu Asp 2045 2050 2055 Asn Leu Asn Lys Ile Thr Ala Gln Gly Gln Tyr Glu Leu Arg Val 2060 2065 2070 Asp Leu Arg Asp His Gly Glu Thr Ala Phe Ala Val Tyr Asp Lys 2075 2080 2085 Phe Ser Val Gly Asp Ala Lys Thr Arg Tyr Lys Leu Lys Val Glu 2090 2095 2100 Gly Tyr Ser Gly Thr Ala Gly Asp Ser Met Ala Tyr His Asn Gly 2105 2110 2115 Arg Ser Phe Ser Thr Phe Asp Lys Asp Thr Asp Ser Ala Ile Thr 2120 2125 2130 Asn Cys Ala Leu Ser Tyr Lys Gly Ala Phe Trp Tyr Arg Asn Cys 2135 2140 2145 His Arg Val Asn Leu Met Gly Arg Tyr Gly Asp Asn Asn His Ser 2150 2155 2160 Gln Gly Val Asn Trp Phe His Trp Lys Gly His Glu His Ser Ile 2165 2170 2175 Gln Phe Ala Glu Met Lys Leu Arg Pro Ser Asn Phe Arg Asn Leu 2180 2185 2190 Glu Gly Arg Arg Lys Arg Ala 2195 2200 3 8578 DNA Artificial Sequence Supplied by Invitrogen of Carlsbad, California 3 gacggatcgg gagatctccc gatcccctat ggtcgactct cagtacaatc tgctctgatg 60 ccgcatagtt aagccagtat ctgctccctg cttgtgtgtt ggaggtcgct gagtagtgcg 120 cgagcaaaat ttaagctaca acaaggcaag gcttgaccga caattgcatg aagaatctgc 180 ttagggttag gcgttttgcg ctgcttcgcg atgtacgggc cagatatacg cgttgacatt 240 gattattgac tagttattaa tagtaatcaa ttacggggtc attagttcat agcccatata 300 tggagttccg cgttacataa cttacggtaa atggcccgcc tggctgaccg cccaacgacc 360 cccgcccatt gacgtcaata atgacgtatg ttcccatagt aacgccaata gggactttcc 420 attgacgtca atgggtggac tatttacggt aaactgccca cttggcagta catcaagtgt 480 atcatatgcc aagtacgccc cctattgacg tcaatgacgg taaatggccc gcctggcatt 540 atgcccagta catgacctta tgggactttc ctacttggca gtacatctac gtattagtca 600 tcgctattac catggtgatg cggttttggc agtacatcaa tgggcgtgga tagcggtttg 660 actcacgggg atttccaagt ctccacccca ttgacgtcaa tgggagtttg ttttggcacc 720 aaaatcaacg ggactttcca aaatgtcgta acaactccgc cccattgacg caaatgggcg 780 gtaggcgtgt acggtgggag gtctatataa gcagagctct ctggctaact agagaaccca 840 ctgcttactg gcttatcgaa attaatacga ctcactatag ggagacccaa gctggctagc 900 gtttaaactt aagcttacca tggggggttc tcatcatcat catcatcatg gtatggctag 960 catgactggt ggacagcaaa tgggtcggga tctgtacgac gatgacgata aggtacctaa 1020 ggatcagctt ggagttgatc ccgtcgtttt acaacgtcgt gactgggaaa accctggcgt 1080 tacccaactt aatcgccttg cagcacatcc ccctttcgcc agctggcgta atagcgaaga 1140 ggcccgcacc gatcgccctt cccaacagtt gcgcagcctg aatggcgaat ggcgctttgc 1200 ctggtttccg gcaccagaag cggtgccgga aagctggctg gagtgcgatc ttcctgaggc 1260 cgatactgtc gtcgtcccct caaactggca gatgcacggt tacgatgcgc ccatctacac 1320 caacgtaacc tatcccatta cggtcaatcc gccgtttgtt cccacggaga atccgacggg 1380 ttgttactcg ctcacattta atgttgatga aagctggcta caggaaggcc agacgcgaat 1440 tatttttgat ggcgttaact cggcgtttca tctgtggtgc aacgggcgct gggtcggtta 1500 cggccaggac agtcgtttgc cgtctgaatt tgacctgagc gcatttttac gcgccggaga 1560 aaaccgcctc gcggtgatgg tgctgcgttg gagtgacggc agttatctgg aagatcagga 1620 tatgtggcgg atgagcggca ttttccgtga cgtctcgttg ctgcataaac cgactacaca 1680 aatcagcgat ttccatgttg ccactcgctt taatgatgat ttcagccgcg ctgtactgga 1740 ggctgaagtt cagatgtgcg gcgagttgcg tgactaccta cgggtaacag tttctttatg 1800 gcagggtgaa acgcaggtcg ccagcggcac cgcgcctttc ggcggtgaaa ttatcgatga 1860 gcgtggtggt tatgccgatc gcgtcacact acgtctgaac gtcgaaaacc cgaaactgtg 1920 gagcgccgaa atcccgaatc tctatcgtgc ggtggttgaa ctgcacaccg ccgacggcac 1980 gctgattgaa gcagaagcct gcgatgtcgg tttccgcgag gtgcggattg aaaatggtct 2040 gctgctgctg aacggcaagc cgttgctgat tcgaggcgtt aaccgtcacg agcatcatcc 2100 tctgcatggt caggtcatgg atgagcagac gatggtgcag gatatcctgc tgatgaagca 2160 gaacaacttt aacgccgtgc gctgttcgca ttatccgaac catccgctgt ggtacacgct 2220 gtgcgaccgc tacggcctgt atgtggtgga tgaagccaat attgaaaccc acggcatggt 2280 gccaatgaat cgtctgaccg atgatccgcg ctggctaccg gcgatgagcg aacgcgtaac 2340 gcgaatggtg cagcgcgatc gtaatcaccc gagtgtgatc atctggtcgc tggggaatga 2400 atcaggccac ggcgctaatc acgacgcgct gtatcgctgg atcaaatctg tcgatccttc 2460 ccgcccggtg cagtatgaag gcggcggagc cgacaccacg gccaccgata ttatttgccc 2520 gatgtacgcg cgcgtggatg aagaccagcc cttcccggct gtgccgaaat ggtccatcaa 2580 aaaatggctt tcgctacctg gagagacgcg cccgctgatc ctttgcgaat acgcccacgc 2640 gatgggtaac agtcttggcg gtttcgctaa atactggcag gcgtttcgtc agtatccccg 2700 tttacagggc ggcttcgtct gggactgggt ggatcagtcg ctgattaaat atgatgaaaa 2760 cggcaacccg tggtcggctt acggcggtga ttttggcgat acgccgaacg atcgccagtt 2820 ctgtatgaac ggtctggtct ttgccgaccg cacgccgcat ccagcgctga cggaagcaaa 2880 acaccagcag cagtttttcc agttccgttt atccgggcaa accatcgaag tgaccagcga 2940 atacctgttc cgtcatagcg ataacgagct cctgcactgg atggtggcgc tggatggtaa 3000 gccgctggca agcggtgaag tgcctctgga tgtcgctcca caaggtaaac agttgattga 3060 actgcctgaa ctaccgcagc cggagagcgc cgggcaactc tggctcacag tacgcgtagt 3120 gcaaccgaac gcgaccgcat ggtcagaagc cgggcacatc agcgcctggc agcagtggcg 3180 tctggcggaa aacctcagtg tgacgctccc cgccgcgtcc cacgccatcc cgcatctgac 3240 caccagcgaa atggattttt gcatcgagct gggtaataag cgttggcaat ttaaccgcca 3300 gtcaggcttt ctttcacaga tgtggattgg cgataaaaaa caactgctga cgccgctgcg 3360 cgatcagttc acccgtgcac cgctggataa cgacattggc gtaagtgaag cgacccgcat 3420 tgaccctaac gcctgggtcg aacgctggaa ggcggcgggc cattaccagg ccgaagcagc 3480 gttgttgcag tgcacggcag atacacttgc tgatgcggtg ctgattacga ccgctcacgc 3540 gtggcagcat caggggaaaa ccttatttat cagccggaaa acctaccgga ttgatggtag 3600 tggtcaaatg gcgattaccg ttgatgttga agtggcgagc gatacaccgc atccggcgcg 3660 gattggcctg aactgccagc tggcgcaggt agcagagcgg gtaaactggc tcggattagg 3720 gccgcaagaa aactatcccg accgccttac tgccgcctgt tttgaccgct gggatctgcc 3780 attgtcagac atgtataccc cgtacgtctt cccgagcgaa aacggtctgc gctgcgggac 3840 gcgcgaattg aattatggcc cacaccagtg gcgcggcgac ttccagttca acatcagccg 3900 ctacagtcaa cagcaactga tggaaaccag ccatcgccat ctgctgcacg cggaagaagg 3960 cacatggctg aatatcgacg gtttccatat ggggattggt ggcgacgact cctggagccc 4020 gtcagtatcg gcggagttcc agctgagcgc cggtcgctac cattaccagt tggtctggtg 4080 tcaaaaataa taaagccgaa ttctgcagat atccagcaca gtggcggccg ctcgagtcta 4140 gagggcccgt ttaaacccgc tgatcagcct cgactgtgcc ttctagttgc cagccatctg 4200 ttgtttgccc ctcccccgtg ccttccttga ccctggaagg tgccactccc actgtccttt 4260 cctaataaaa tgaggaaatt gcatcgcatt gtctgagtag gtgtcattct attctggggg 4320 gtggggtggg gcaggacagc aagggggagg attgggaaga caatagcagg catgctgggg 4380 atgcggtggg ctctatggct tctgaggcgg aaagaaccag ctggggctct agggggtatc 4440 cccacgcgcc ctgtagcggc gcattaagcg cggcgggtgt ggtggttacg cgcagcgtga 4500 ccgctacact tgccagcgcc ctagcgcccg ctcctttcgc tttcttccct tcctttctcg 4560 ccacgttcgc cggctttccc cgtcaagctc taaatcgggg catcccttta gggttccgat 4620 ttagtgcttt acggcacctc gaccccaaaa aacttgatta gggtgatggt tcacgtagtg 4680 ggccatcgcc ctgatagacg gtttttcgcc ctttgacgtt ggagtccacg ttctttaata 4740 gtggactctt gttccaaact ggaacaacac tcaaccctat ctcggtctat tcttttgatt 4800 tataagggat tttggggatt tcggcctatt ggttaaaaaa tgagctgatt taacaaaaat 4860 ttaacgcgaa ttaattctgt ggaatgtgtg tcagttaggg tgtggaaagt ccccaggctc 4920 cccaggcagg cagaagtatg caaagcatgc atctcaatta gtcagcaacc aggtgtggaa 4980 agtccccagg ctccccagca ggcagaagta tgcaaagcat gcatctcaat tagtcagcaa 5040 ccatagtccc gcccctaact ccgcccatcc cgcccctaac tccgcccagt tccgcccatt 5100 ctccgcccca tggctgacta atttttttta tttatgcaga ggccgaggcc gcctctgcct 5160 ctgagctatt ccagaagtag tgaggaggct tttttggagg cctaggcttt tgcaaaaagc 5220 tcccgggagc ttgtatatcc attttcggat ctgatcaaga gacaggatga ggatcgtttc 5280 gcatgattga acaagatgga ttgcacgcag gttctccggc cgcttgggtg gagaggctat 5340 tcggctatga ctgggcacaa cagacaatcg gctgctctga tgccgccgtg ttccggctgt 5400 cagcgcaggg gcgcccggtt ctttttgtca agaccgacct gtccggtgcc ctgaatgaac 5460 tgcaggacga ggcagcgcgg ctatcgtggc tggccacgac gggcgttcct tgcgcagctg 5520 tgctcgacgt tgtcactgaa gcgggaaggg actggctgct attgggcgaa gtgccggggc 5580 aggatctcct gtcatctcac cttgctcctg ccgagaaagt atccatcatg gctgatgcaa 5640 tgcggcggct gcatacgctt gatccggcta cctgcccatt cgaccaccaa gcgaaacatc 5700 gcatcgagcg agcacgtact cggatggaag ccggtcttgt cgatcaggat gatctggacg 5760 aagagcatca ggggctcgcg ccagccgaac tgttcgccag gctcaaggcg cgcatgcccg 5820 acggcgagga tctcgtcgtg acccatggcg atgcctgctt gccgaatatc atggtggaaa 5880 atggccgctt ttctggattc atcgactgtg gccggctggg tgtggcggac cgctatcagg 5940 acatagcgtt ggctacccgt gatattgctg aagagcttgg cggcgaatgg gctgaccgct 6000 tcctcgtgct ttacggtatc gccgctcccg attcgcagcg catcgccttc tatcgccttc 6060 ttgacgagtt cttctgagcg ggactctggg gttcgaaatg accgaccaag cgacgcccaa 6120 cctgccatca cgagatttcg attccaccgc cgccttctat gaaaggttgg gcttcggaat 6180 cgttttccgg gacgccggct ggatgatcct ccagcgcggg gatctcatgc tggagttctt 6240 cgcccacccc aacttgttta ttgcagctta taatggttac aaataaagca atagcatcac 6300 aaatttcaca aataaagcat ttttttcact gcattctagt tgtggtttgt ccaaactcat 6360 caatgtatct tatcatgtct gtataccgtc gacctctagc tagagcttgg cgtaatcatg 6420 gtcatagctg tttcctgtgt gaaattgtta tccgctcaca attccacaca acatacgagc 6480 cggaagcata aagtgtaaag cctggggtgc ctaatgagtg agctaactca cattaattgc 6540 gttgcgctca ctgcccgctt tccagtcggg aaacctgtcg tgccagctgc attaatgaat 6600 cggccaacgc gcggggagag gcggtttgcg tattgggcgc tcttccgctt cctcgctcac 6660 tgactcgctg cgctcggtcg ttcggctgcg gcgagcggta tcagctcact caaaggcggt 6720 aatacggtta tccacagaat caggggataa cgcaggaaag aacatgtgag caaaaggcca 6780 gcaaaaggcc aggaaccgta aaaaggccgc gttgctggcg tttttccata ggctccgccc 6840 ccctgacgag catcacaaaa atcgacgctc aagtcagagg tggcgaaacc cgacaggact 6900 ataaagatac caggcgtttc cccctggaag ctccctcgtg cgctctcctg ttccgaccct 6960 gccgcttacc ggatacctgt ccgcctttct cccttcggga agcgtggcgc tttctcaatg 7020 ctcacgctgt aggtatctca gttcggtgta ggtcgttcgc tccaagctgg gctgtgtgca 7080 cgaacccccc gttcagcccg accgctgcgc cttatccggt aactatcgtc ttgagtccaa 7140 cccggtaaga cacgacttat cgccactggc agcagccact ggtaacagga ttagcagagc 7200 gaggtatgta ggcggtgcta cagagttctt gaagtggtgg cctaactacg gctacactag 7260 aaggacagta tttggtatct gcgctctgct gaagccagtt accttcggaa aaagagttgg 7320 tagctcttga tccggcaaac aaaccaccgc tggtagcggt ggtttttttg tttgcaagca 7380 gcagattacg cgcagaaaaa aaggatctca agaagatcct ttgatctttt ctacggggtc 7440 tgacgctcag tggaacgaaa actcacgtta agggattttg gtcatgagat tatcaaaaag 7500 gatcttcacc tagatccttt taaattaaaa atgaagtttt aaatcaatct aaagtatata 7560 tgagtaaact tggtctgaca gttaccaatg cttaatcagt gaggcaccta tctcagcgat 7620 ctgtctattt cgttcatcca tagttgcctg actccccgtc gtgtagataa ctacgatacg 7680 ggagggctta ccatctggcc ccagtgctgc aatgataccg cgagacccac gctcaccggc 7740 tccagattta tcagcaataa accagccagc cggaagggcc gagcgcagaa gtggtcctgc 7800 aactttatcc gcctccatcc agtctattaa ttgttgccgg gaagctagag taagtagttc 7860 gccagttaat agtttgcgca acgttgttgc cattgctaca ggcatcgtgg tgtcacgctc 7920 gtcgtttggt atggcttcat tcagctccgg ttcccaacga tcaaggcgag ttacatgatc 7980 ccccatgttg tgcaaaaaag cggttagctc cttcggtcct ccgatcgttg tcagaagtaa 8040 gttggccgca gtgttatcac tcatggttat ggcagcactg cataattctc ttactgtcat 8100 gccatccgta agatgctttt ctgtgactgg tgagtactca accaagtcat tctgagaata 8160 gtgtatgcgg cgaccgagtt gctcttgccc ggcgtcaata cgggataata ccgcgccaca 8220 tagcagaact ttaaaagtgc tcatcattgg aaaacgttct tcggggcgaa aactctcaag 8280 gatcttaccg ctgttgagat ccagttcgat gtaacccact cgtgcaccca actgatcttc 8340 agcatctttt actttcacca gcgtttctgg gtgagcaaaa acaggaaggc aaaatgccgc 8400 aaaaaaggga ataagggcga cacggaaatg ttgaatactc atactcttcc tttttcaata 8460 ttattgaagc atttatcagg gttattgtct catgagcgga tacatatttg aatgtattta 8520 gaaaaataaa caaatagggg ttccgcgcac atttccccga aaagtgccac ctgacgtc 8578 4 4748 DNA Artificial Sequence Provided by Dr. Brett Levay-Young of the University of Minnesota 4 tagttattaa tagtaatcaa ttacggggtc attagttcat agcccatata tggagttccg 60 cgttacataa cttacggtaa atggcccgcc tggctgaccg cccaacgacc cccgcccatt 120 gacgtcaata atgacgtatg ttcccatagt aacgccaata gggactttcc attgacgtca 180 atgggtggag tatttacggt aaactgccca cttggcagta catcaagtgt atcatatgcc 240 aagtacgccc cctattgacg tcaatgacgg taaatggccc gcctggcatt atgcccagta 300 catgacctta tgggactttc ctacttggca gtacatctac gtattagtca tcgctattac 360 catggtgatg cggttttggc agtacatcaa tgggcgtgga tagcggtttg actcacgggg 420 atttccaagt ctccacccca ttgacgtcaa tgggagtttg ttttggcacc aaaatcaacg 480 ggactttcca aaatgtcgta acaactccgc cccattgacg caaatgggcg gtaggcgtgt 540 acggtgggag gtctatataa gcagagctgg tttagtgaac cgtcagatcc gctagcgcta 600 ccggtcgcca ccatggtgag caagggcgag gagctgttca ccggggtggt gcccatcctg 660 gtcgagctgg acggcgacgt aaacggccac aagttcagcg tgtccggcga gggcgagggc 720 gatgccacct acggcaagct gaccctgaag ttcatctgca ccaccggcaa gctgcccgtg 780 ccctggccca ccctcgtgac caccctgacc tacggcgtgc agtgcttcag ccgctacccc 840 gaccacatga agcagcacga cttcttcaag tccgccatgc ccgaaggcta cgtccaggag 900 cgcaccatct tcttcaagga cgacggcaac tacaagaccc gcgccgaggt gaagttcgag 960 ggcgacaccc tggtgaaccg catcgagctg aagggcatcg acttcaagga ggacggcaac 1020 atcctggggc acaagctgga gtacaactac aacagccaca acgtctatat catggccgac 1080 aagcagaaga acggcatcaa ggtgaacttc aagatccgcc acaacatcga ggacggcagc 1140 gtgcagctcg ccgaccacta ccagcagaac acccccatcg gcgacggccc cgtgctgctg 1200 cccgacaacc actacctgag cacccagtcc gccctgagca aagaccccaa cgagaagcgc 1260 gatcacatgg tcctgctgga gttcgtgacc gccgccggga tcactctcgg catggacgag 1320 ctgtacaagt actcagatct cgagctcaag cttaaccctc cggacgagag cggccctggc 1380 tgtatgtcct gcaagtgcgt gctgtcctga tcaccggatc tagataactg atcataatca 1440 gccataccac atttgtagag gttttacttg ctttaaaaaa cctcccacac ctccccctga 1500 acctgaaaca taaaatgaat gcaattgttg ttgttaactt gtttattgca gcttataatg 1560 gttacaaata aagcaatagc atcacaaatt tcacaaataa agcatttttt tcactgcatt 1620 ctagttgtgg tttgtccaaa ctcatcaatg tatcttaacg cgtaaattgt aagcgttaat 1680 attttgttaa aattcgcgtt aaatttttgt taaatcagct cattttttaa ccaataggcc 1740 gaaatcggca aaatccctta taaatcaaaa gaatagaccg agatagggtt gagtgttgtt 1800 ccagtttgga acaagagtcc actattaaag aacgtggact ccaacgtcaa agggcgaaaa 1860 accgtctatc agggcgatgg cccactacgt gaaccatcac cctaatcaag ttttttgggg 1920 tcgaggtgcc gtaaagcact aaatcggaac cctaaaggga gcccccgatt tagagcttga 1980 cggggaaagc cggcgaacgt ggcgagaaag gaagggaaga aagcgaaagg agcgggcgct 2040 agggcgctgg caagtgtagc ggtcacgctg cgcgtaacca ccacacccgc cgcgcttaat 2100 gcgccgctac agggcgcgtc aggtggcact tttcggggaa atgtgcgcgg aacccctatt 2160 tgtttatttt tctaaataca ttcaaatatg tatccgctca tgagacaata accctgataa 2220 atgcttcaat aatattgaaa aaggaagagt cctgaggcgg aaagaaccag ctgtggaatg 2280 tgtgtcagtt agggtgtgga aagtccccag gctccccagc aggcagaagt atgcaaagca 2340 tgcatctcaa ttagtcagca accaggtgtg gaaagtcccc aggctcccca gcaggcagaa 2400 gtatgcaaag catgcatctc aattagtcag caaccatagt cccgccccta actccgccca 2460 tcccgcccct aactccgccc agttccgccc attctccgcc ccatggctga ctaatttttt 2520 ttatttatgc agaggccgag gccgcctcgg cctctgagct attccagaag tagtgaggag 2580 gcttttttgg aggcctaggc ttttgcaaag atcgatcaag agacaggatg aggatcgttt 2640 cgcatgattg aacaagatgg attgcacgca ggttctccgg ccgcttgggt ggagaggcta 2700 ttcggctatg actgggcaca acagacaatc ggctgctctg atgccgccgt gttccggctg 2760 tcagcgcagg ggcgcccggt tctttttgtc aagaccgacc tgtccggtgc cctgaatgaa 2820 ctgcaagacg aggcagcgcg gctatcgtgg ctggccacga cgggcgttcc ttgcgcagct 2880 gtgctcgacg ttgtcactga agcgggaagg gactggctgc tattgggcga agtgccgggg 2940 caggatctcc tgtcatctca ccttgctcct gccgagaaag tatccatcat ggctgatgca 3000 atgcggcggc tgcatacgct tgatccggct acctgcccat tcgaccacca agcgaaacat 3060 cgcatcgagc gagcacgtac tcggatggaa gccggtcttg tcgatcagga tgatctggac 3120 gaagagcatc aggggctcgc gccagccgaa ctgttcgcca ggctcaaggc gagcatgccc 3180 gacggcgagg atctcgtcgt gacccatggc gatgcctgct tgccgaatat catggtggaa 3240 aatggccgct tttctggatt catcgactgt ggccggctgg gtgtggcgga ccgctatcag 3300 gacatagcgt tggctacccg tgatattgct gaagagcttg gcggcgaatg ggctgaccgc 3360 ttcctcgtgc tttacggtat cgccgctccc gattcgcagc gcatcgcctt ctatcgcctt 3420 cttgacgagt tcttctgagc gggactctgg ggttcgaaat gaccgaccaa gcgacgccca 3480 acctgccatc acgagatttc gattccaccg ccgccttcta tgaaaggttg ggcttcggaa 3540 tcgttttccg ggacgccggc tggatgatcc tccagcgcgg ggatctcatg ctggagttct 3600 tcgcccaccc tagggggagg ctaactgaaa cacggaagga gacaataccg gaaggaaccc 3660 gcgctatgac ggcaataaaa agacagaata aaacgcacgg tgttgggtcg tttgttcata 3720 aacgcggggt tcggtcccag ggctggcact ctgtcgatac cccaccgaga ccccattggg 3780 gccaatacgc ccgcgtttct tccttttccc caccccaccc cccaagttcg ggtgaaggcc 3840 cagggctcgc agccaacgtc ggggcggcag gccctgccat agcctcaggt tactcatata 3900 tactttagat tgatttaaaa cttcattttt aatttaaaag gatctaggtg aagatccttt 3960 ttgataatct catgaccaaa atcccttaac gtgagttttc gttccactga gcgtcagacc 4020 ccgtagaaaa gatcaaagga tcttcttgag atcctttttt tctgcgcgta atctgctgct 4080 tgcaaacaaa aaaaccaccg ctaccagcgg tggtttgttt gccggatcaa gagctaccaa 4140 ctctttttcc gaaggtaact ggcttcagca gagcgcagat accaaatact gtccttctag 4200 tgtagccgta gttaggccac cacttcaaga actctgtagc accgcctaca tacctcgctc 4260 tgctaatcct gttaccagtg gctgctgcca gtggcgataa gtcgtgtctt accgggttgg 4320 actcaagacg atagttaccg gataaggcgc agcggtcggg ctgaacgggg ggttcgtgca 4380 cacagcccag cttggagcga acgacctaca ccgaactgag atacctacag cgtgagctat 4440 gagaaagcgc cacgcttccc gaagggagaa aggcggacag gtatccggta agcggcaggg 4500 tcggaacagg agagcgcacg agggagcttc cagggggaaa cgcctggtat ctttatagtc 4560 ctgtcgggtt tcgccacctc tgacttgagc gtcgattttt gtgatgctcg tcaggggggc 4620 ggagcctatg gaaaaacgcc agcaacgcgg cctttttacg gttcctggcc ttttgctggc 4680 cttttgctca catgttcttt cctgcgttat cccctgattc tgtggataac cgtattaccg 4740 ccatgcat 4748 5 4992 DNA Artificial Sequence Supplied by BD Biosciences Clonetech of Palo Alto, California 5 tagttattaa tagtaatcaa ttacggggtc attagttcat agcccatata tggagttccg 60 cgttacataa cttacggtaa atggcccgcc tggctgaccg cccaacgacc cccgcccatt 120 gacgtcaata atgacgtatg ttcccatagt aacgccaata gggactttcc attgacgtca 180 atgggtggag tatttacggt aaactgccca cttggcagta catcaagtgt atcatatgcc 240 aagtacgccc cctattgacg tcaatgacgg taaatggccc gcctggcatt atgcccagta 300 catgacctta tgggactttc ctacttggca gtacatctac gtattagtca tcgctattac 360 catggtgatg cggttttggc agtacatcaa tgggcgtgga tagcggtttg actcacgggg 420 atttccaagt ctccacccca ttgacgtcaa tgggagtttg ttttggcacc aaaatcaacg 480 ggactttcca aaatgtcgta acaactccgc cccattgacg caaatgggcg gtaggcgtgt 540 acggtgggag gtctatataa gcagagctgg tttagtgaac cgtcagatcc gctagcgcta 600 ccggtcgcca ccatggtgag caagggcgag gagctgttca ccggggtggt gcccatcctg 660 gtcgagctgg acggcgacgt aaacggccac aagttcagcg tgtccggcga gggcgagggc 720 gatgccacct acggcaagct gaccctgaag ttcatctgca ccaccggcaa gctgcccgtg 780 ccctggccca ccctcgtgac caccctgacc tacggcgtgc agtgcttcag ccgctacccc 840 gaccacatga agcagcacga cttcttcaag tccgccatgc ccgaaggcta cgtccaggag 900 cgcaccatct tcttcaagga cgacggcaac tacaagaccc gcgccgaggt gaagttcgag 960 ggcgacaccc tggtgaaccg catcgagctg aagggcatcg acttcaagga ggacggcaac 1020 atcctggggc acaagctgga gtacaactac aacagccaca acgtctatat catggccgac 1080 aagcagaaga acggcatcaa ggtgaacttc aagatccgcc acaacatcga ggacggcagc 1140 gtgcagctcg ccgaccacta ccagcagaac acccccatcg gcgacggccc cgtgctgctg 1200 cccgacaacc actacctgag cacccagtcc gccctgagca aagaccccaa cgagaagcgc 1260 gatcacatgg tcctgctgga gttcgtgacc gccgccggga tcactctcgg catggacgag 1320 ctgtacaagt actcagatct cgagctcaag cttaccatgg ggggttctca tcatcatcat 1380 catcatggta tggctagcat gactggtgga cagcaaatgg gtcgggatct gtacgacgat 1440 gacgataagg ggactgctgc ggccaatgcg aacgacttct tcgccaagcg caagagaact 1500 gcgcaggaga acaaggcgtc gaacgacgtc cctccagggt gtccctctcc aaacgtggct 1560 cctggggtgg gcgcggtgga gcagaccccg cgcaaacgtc tgagatgagg atccagtgtg 1620 gtggaattct gcagatatcc agcacagtgg cggccgctcg agtctagata actgatcata 1680 atcagccata ccacatttgt agaggtttta cttgctttaa aaaacctccc acacctcccc 1740 ctgaacctga aacataaaat gaatgcaatt gttgttgtta acttgtttat tgcagcttat 1800 aatggttaca aataaagcaa tagcatcaca aatttcacaa ataaagcatt tttttcactg 1860 cattctagtt gtggtttgtc caaactcatc aatgtatctt aacgcgtaaa ttgtaagcgt 1920 taatattttg ttaaaattcg cgttaaattt ttgttaaatc agctcatttt ttaaccaata 1980 ggccgaaatc ggcaaaatcc cttataaatc aaaagaatag accgagatag ggttgagtgt 2040 tgttccagtt tggaacaaga gtccactatt aaagaacgtg gactccaacg tcaaagggcg 2100 aaaaaccgtc tatcagggcg atggcccact acgtgaacca tcaccctaat caagtttttt 2160 ggggtcgagg tgccgtaaag cactaaatcg gaaccctaaa gggagccccc gatttagagc 2220 ttgacgggga aagccggcga acgtggcgag aaaggaaggg aagaaagcga aaggagcggg 2280 cgctagggcg ctggcaagtg tagcggtcac gctgcgcgta accaccacac ccgccgcgct 2340 taatgcgccg ctacagggcg cgtcaggtgg cacttttcgg ggaaatgtgc gcggaacccc 2400 tatttgttta tttttctaaa tacattcaaa tatgtatccg ctcatgagac aataaccctg 2460 ataaatgctt caataatatt gaaaaaggaa gagtcctgag gcggaaagaa ccagctgtgg 2520 aatgtgtgtc agttagggtg tggaaagtcc ccaggctccc cagcaggcag aagtatgcaa 2580 agcatgcatc tcaattagtc agcaaccagg tgtggaaagt ccccaggctc cccagcaggc 2640 agaagtatgc aaagcatgca tctcaattag tcagcaacca tagtcccgcc cctaactccg 2700 cccatcccgc ccctaactcc gcccagttcc gcccattctc cgccccatgg ctgactaatt 2760 ttttttattt atgcagaggc cgaggccgcc tcggcctctg agctattcca gaagtagtga 2820 ggaggctttt ttggaggcct aggcttttgc aaagatcgat caagagacag gatgaggatc 2880 gtttcgcatg attgaacaag atggattgca cgcaggttct ccggccgctt gggtggagag 2940 gctattcggc tatgactggg cacaacagac aatcggctgc tctgatgccg ccgtgttccg 3000 gctgtcagcg caggggcgcc cggttctttt tgtcaagacc gacctgtccg gtgccctgaa 3060 tgaactgcaa gacgaggcag cgcggctatc gtggctggcc acgacgggcg ttccttgcgc 3120 agctgtgctc gacgttgtca ctgaagcggg aagggactgg ctgctattgg gcgaagtgcc 3180 ggggcaggat ctcctgtcat ctcaccttgc tcctgccgag aaagtatcca tcatggctga 3240 tgcaatgcgg cggctgcata cgcttgatcc ggctacctgc ccattcgacc accaagcgaa 3300 acatcgcatc gagcgagcac gtactcggat ggaagccggt cttgtcgatc aggatgatct 3360 ggacgaagag catcaggggc tcgcgccagc cgaactgttc gccaggctca aggcgagcat 3420 gcccgacggc gaggatctcg tcgtgaccca tggcgatgcc tgcttgccga atatcatggt 3480 ggaaaatggc cgcttttctg gattcatcga ctgtggccgg ctgggtgtgg cggaccgcta 3540 tcaggacata gcgttggcta cccgtgatat tgctgaagag cttggcggcg aatgggctga 3600 ccgcttcctc gtgctttacg gtatcgccgc tcccgattcg cagcgcatcg ccttctatcg 3660 ccttcttgac gagttcttct gagcgggact ctggggttcg aaatgaccga ccaagcgacg 3720 cccaacctgc catcacgaga tttcgattcc accgccgcct tctatgaaag gttgggcttc 3780 ggaatcgttt tccgggacgc cggctggatg atcctccagc gcggggatct catgctggag 3840 ttcttcgccc accctagggg gaggctaact gaaacacgga aggagacaat accggaagga 3900 acccgcgcta tgacggcaat aaaaagacag aataaaacgc acggtgttgg gtcgtttgtt 3960 cataaacgcg gggttcggtc ccagggctgg cactctgtcg ataccccacc gagaccccat 4020 tggggccaat acgcccgcgt ttcttccttt tccccacccc accccccaag ttcgggtgaa 4080 ggcccagggc tcgcagccaa cgtcggggcg gcaggccctg ccatagcctc aggttactca 4140 tatatacttt agattgattt aaaacttcat ttttaattta aaaggatcta ggtgaagatc 4200 ctttttgata atctcatgac caaaatccct taacgtgagt tttcgttcca ctgagcgtca 4260 gaccccgtag aaaagatcaa aggatcttct tgagatcctt tttttctgcg cgtaatctgc 4320 tgcttgcaaa caaaaaaacc accgctacca gcggtggttt gtttgccgga tcaagagcta 4380 ccaactcttt ttccgaaggt aactggcttc agcagagcgc agataccaaa tactgtcctt 4440 ctagtgtagc cgtagttagg ccaccacttc aagaactctg tagcaccgcc tacatacctc 4500 gctctgctaa tcctgttacc agtggctgct gccagtggcg ataagtcgtg tcttaccggg 4560 ttggactcaa gacgatagtt accggataag gcgcagcggt cgggctgaac ggggggttcg 4620 tgcacacagc ccagcttgga gcgaacgacc tacaccgaac tgagatacct acagcgtgag 4680 ctatgagaaa gcgccacgct tcccgaaggg agaaaggcgg acaggtatcc 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US10967049B2 (en) | 2014-01-12 | 2021-04-06 | Igf Oncology, Llc | Fusion proteins containing insulin-like growth factor-1 and epidermal growth factor and variants thereof and uses thereof |
US10987308B2 (en) | 2014-09-03 | 2021-04-27 | Genesegues, Inc. | Therapeutic nanoparticles and related compositions, methods and systems |
US11324834B2 (en) | 2017-05-21 | 2022-05-10 | Igf Oncology, Llc | Insulin-like growth factor-chemotherapeputic conjugate for treating myelodysplastic syndrome |
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CA2400172C (en) | 2010-04-20 |
AU2001247244B2 (en) | 2005-06-02 |
US6632671B2 (en) | 2003-10-14 |
EP1267946A2 (en) | 2003-01-02 |
HK1048772A1 (en) | 2003-04-17 |
JP2003524654A (en) | 2003-08-19 |
EP1267946A4 (en) | 2008-07-02 |
JP4751556B2 (en) | 2011-08-17 |
CN1406140A (en) | 2003-03-26 |
CA2400172A1 (en) | 2001-09-07 |
WO2001064164A2 (en) | 2001-09-07 |
WO2001064164A3 (en) | 2001-12-20 |
AU4724401A (en) | 2001-09-12 |
MXPA02008361A (en) | 2004-05-17 |
US20030170893A1 (en) | 2003-09-11 |
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