WO2005023292A1 - Methods of treating restenosis - Google Patents
Methods of treating restenosis Download PDFInfo
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- WO2005023292A1 WO2005023292A1 PCT/US2004/028746 US2004028746W WO2005023292A1 WO 2005023292 A1 WO2005023292 A1 WO 2005023292A1 US 2004028746 W US2004028746 W US 2004028746W WO 2005023292 A1 WO2005023292 A1 WO 2005023292A1
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
- C12N15/86—Viral vectors
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- A61K48/00—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy
- A61K48/005—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy characterised by an aspect of the 'active' part of the composition delivered, i.e. the nucleic acid delivered
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- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L33/00—Antithrombogenic treatment of surgical articles, e.g. sutures, catheters, prostheses, or of articles for the manipulation or conditioning of blood; Materials for such treatment
- A61L33/06—Use of macromolecular materials
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- A61L33/128—Other specific proteins or polypeptides not covered by A61L33/122 - A61L33/126
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- A61P9/00—Drugs for disorders of the cardiovascular system
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
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- A61K48/00—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2710/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA dsDNA viruses
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Definitions
- CAD Coronary artery disease
- stents e.g., balloon stents
- ⁇ i-stent restenosis the recurrence of constriction of an artery following efforts to dilate it
- PCI percutaneous coronary interventions
- Rapamycin an antibiotic that inhibits cell migration and proliferation, is effective in reducing restenosis.
- prolonged exposure of smooth muscle cells to rapamycin results in the development of resistance to the drug (Luo et al., 1996, Mol. Cell. Biol. 16: 6744-6751).
- the disclosure features a method of treating restenosis in a subject, e.g., a human.
- the method includes: (a) identifying a subject in need of treatment for restenosis (e.g., a subject who has had angioplasty, or a subject who has had a stent placed in a body cavity, such as a blood vessel); and administering to a tissue, e.g., a blood vessel, of the subject an agent that increases SERCA activity in an amount sufficient to reduce or prevent restenosis in the subject.
- a subject in need of treatment for restenosis e.g., a subject who has had angioplasty, or a subject who has had a stent placed in a body cavity, such as a blood vessel
- an agent that increases SERCA activity in an amount sufficient to reduce or prevent restenosis in the subject.
- SERCA is SERCA1, e.g., SERCAla or SERCAlb; SERCA2, e.g., SERCA2a or SERCA2b; or SERCA3, but preferably SERCA2a.
- the agent may also be administered in an amount effective to prevent endothelial cell proliferation or neointima formation.
- the agent can be, e.g., a SERCA polypeptide or a functional fragment, variant or analog thereof having a SERCA activity, e.g., ATPase activity; a peptide or protein agonist of SERCA that increases the activity, e.g., the ATPase activity of SERCA (e.g., by increasing or stabilizing binding of SERCA to a binding partner, e.g., phospholamban); a small molecule that increases expression of SERCA, e.g., by binding to the promoter region of the SERCA gene; an antibody, e.g., an antibody (e.g., an intrabody) that binds to and stabilizes or assists the binding of SERCA to a SERCA binding partner (e.g., a SERCA binding partner described herein); or a nucleotide sequence encoding a SERCA polypeptide
- the nucleotide sequence can be a genomic sequence or a cDNA sequence.
- the nucleotide sequence can include: a SERCA coding region; a promoter sequence, e.g., a promoter sequence from a SERCA gene or from another gene; an enhancer sequence; untranslated regulatory sequences, e.g., a 5' untranslated region (UTR), e.g., a 5'UTR from a SERCA gene or from another gene, a 3' UTR, e.g., a 3'UTR from a SERCA gene or from another gene; a polyadenylation site; an insulator sequence.
- UTR 5' untranslated region
- the level of SERCA protein is increased by increasing the level of expression of an endogenous SERCA gene, e.g., by increasing transcription of the SERCA gene or increasing SERCA mRNA stability, i a preferred embodiment, transcription of the SERCA gene is increased by: altering the regulatory sequence of the endogenous SERCA gene, e.g., by the addition of a positive regulatory element (such as an enhancer or a DNA-binding site for a transcriptional activator); the deletion of a negative regulatory element (such as a DNA-binding site for a transcriptional repressor) and/or replacement of the endogenous regulatory sequence, or elements therein, with that of another gene, thereby allowing the coding region of the SERCA gene to be transcribed more efficiently.
- a positive regulatory element such as an enhancer or a DNA-binding site for a transcriptional activator
- a negative regulatory element such as a DNA-binding site for a transcriptional repressor
- the agent is a vector that includes a nucleic acid encoding SERCA, e.g., SERCA1, e.g., SERCAla or SERCAlb; SERCA2, e.g., SERCA2a or SERCA2b; or SERCA3, preferably a human SERCA.
- SERCA e.g., SERCA1, e.g., SERCAla or SERCAlb
- SERCA2, e.g., SERCA2a or SERCA2b SERCA3, preferably a human SERCA.
- the vector can be any vector suitable for gene transfer.
- the vector can be an adeno viral vector, e.g., recombinant type 2 or type 5 adenoviral vector; an adeno-associated virus, e.g., adeno-associated virus type 1, 2, 3, 4, 5 or 6, a lentiviral vector, or plasmid-based vector.
- the vector is preferably an adeno-associated virus-based vector or a lentivirus.
- Other vectors suitable for gene transfer, e.g., to cardiovascular tissue, are known in the art.
- the SERCA encoding nucleic acid is under the control of a heterologous regulatory region, e.g., a heterologous promoter.
- the promoter can be, e.g., a smooth muscle specific promoter, such as a smooth muscle alpha actin promoter, SM22a promoter; cardiac specific promoter, such as a cardiac myosin promoter (e.g., a cardiac myosin light chain 2v promoter), troponin T promoter, or BNP promoter.
- the promoter can also be, e.g., a viral promoter, such as CMV promoter.
- the promoter can be an inducible promoter, e.g., one regulatable by an exogenous agent, e.g., FK506, FK1012, a steroid, or tetracycline.
- the agent can be delivered by direct administration, e.g., injection (e.g., intra arterial, iv or im). In one embodiment, the agent is delivered directly to an affected vessel, e.g., artery.
- the agent can be coupled to a second agent, e.g., a delivery agent (e.g., an agent that protects the agent from degradation) or a targeting agent (e.g., for targeting to the vessel or targeting to the inside of a cell such as a smooth muscle cell, e.g., a liposome).
- a delivery agent e.g., an agent that protects the agent from degradation
- a targeting agent e.g., for targeting to the vessel or targeting to the inside of a cell such as a smooth muscle cell, e.g., a liposome.
- the subject is a human, e.g., a male or female human.
- the human can be between 20-40 years of age, 40-60 years of age, or 60-70 years of age, or greater than 70 years of age.
- the subject is identified by evaluation of the subject's health history, conducting a physical examination, or by performing clinical testing.
- a preferred subject is one who has undergone or will undergo (e.g., within 1, 2, 3, 5, 10, 15, 30, or more, days) angioplasty, balloon angioplasty, insertion of a prosthesis, insertion of a graft, insertion of a stent, catheterization, or arterial blockage evaluation.
- the restenosis occurs after angioplasty.
- the restenosis occurs after vascular stent placement.
- the blood vessel is preferably a coronary artery, and can also be, for example, a peripheral artery or a cerebral artery.
- the method includes implanting a stent in an afflicted blood vessel of the subject, wherein the stent is coated with, or contains, the agent that increases SERCA activity, e.g., an agent described herein.
- the method includes implanting in a blood vessel of the subject a stent coated with, or containing, SERCA2a or an expression vector that includes a SERCA2a encoding nucleic acid.
- the agent is an agent that decreases phospholamban activity.
- An agent that inhibits phospholamban levels and/or activity can be one or more of: a phospholamban binding protein, e.g., a soluble phospholamban binding protein that binds and inhibits a phospholamban activity, e.g., SERCA2 binding activity; an antibody that specifically binds to the phospholamban protein, e.g., an antibody that disrupts phospholamban's ability to bind SERCA; a mutated inactive phospholamban or fragment thereof which, e.g., binds to a phospholamban binding partner (e.g., SERCA) but disrupts a phospholamban activity; a phospholamban nucleic acid molecule that can bind to a cellular phospholamban nucleic acid sequence, e.g., mRNA, and inhibit expression of the protein, e.g., an antisense molecule, phospholamban ribozyme or iRNA agent;
- phospholamban is inhibited by decreasing the level of expression of an endogenous phospholamban gene, e.g., by decreasing transcription of the phospholamban gene.
- transcription of the phospholamban gene can be decreased by: altering the regulatory sequences of the endogenous phospholamban gene, e.g., by the addition of a negative regulatory sequence (such as a DNA-biding site for a transcriptional repressor), or by the removal of a positive regulatory sequence (such as an enhancer or a DNA-binding site for a transcriptional activator), activity, e.g., antisense nucleic acid at least partially complementary to a phospholamban DNA sequence, preferably a human phospholamban DNA sequence.
- a negative regulatory sequence such as a DNA-biding site for a transcriptional repressor
- a positive regulatory sequence such as an enhancer or a DNA-binding site for a transcriptional activator
- the method includes preconditioning the heart of the subject; and delivering the agent into a cardiovascular cell of the preconditioned heart, wherein the flow of blood through the heart is reduced during the delivery of the agent.
- the agent is a nucleic acid (e.g., a SERCA2a encoding nucleic acid) administered into a vessel of the preconditioned heart, wherein the flow of blood through the heart is reduced during the delivery of the agent.
- preconditioning is accomplished using a catheter, e.g., a balloon catheter.
- Preconditioning refers to a naturally occurring protective mechanism by which a brief period of ischemia protects a tissue against adverse effects of a subsequent, prolonged period of ischemia.
- preconditioning means inducing a state in which the heart is more resistant to damage from a second stoppage of flow.
- Preconditioning the heart muscle can be accomplished by a brief occlusion of a cardiac vessel (e.g., the left anterior descending artery) resulting in substantially increased expression of a gene subsequently transduced into the heart muscle.
- Preconditioning in the present method can be induced with a pharmacological agent, a mechanical manipulation, e.g., a catheter (e.g., a balloon catheter), or other surgical method.
- the method includes evaluating the subject for a cardiovascular parameter, e.g., lumen loss, heart rate, heart contractility, ventricular function, e.g., left ventricular end-diastolic pressure (LVEDP), left ventricular systolic pressure (LVSP), Ca 2+ metabolism, e.g., intracellular Ca 2+ concentration or peak or resting Ca 2+ , force generation, relaxation and pressure of the heart, a force frequency relationship, cardiocyte survival or apoptosis or ion channel activity, e.g., sodium calcium exchange, sodium channel activity, calcium channel activity, sodium potassium ATPase pump activity, activity of myosin heavy chain, troponin I, troponin C, troponin T, tropomyosin, actin, myosin light chain kinase, myosin light chain 1, myosin light chain 2 or myosin light chain 3, IGF-1 receptor, PI3 kinase, AKT kinase
- the evaluation can include performing angiography (e.g., quantitative angiography) and/or intravascular ultrasound (IVUS), e.g., before, after, or during the treatment.
- angiography e.g., quantitative angiography
- IVUS intravascular ultrasound
- a pharmaceutical composition including one or more of the agents described herein is administered in a pharmaceutically effective dose.
- the administration of an agent which increases SERCA expression, levels or activity can be initiated: when the subject begins to show signs of restenosis, e.g., as evidenced by an decrease of more than 5, 10, 20, or 30% in lumen; when a coronary vascular condition is diagnosed; at the time a treatment for a coronary vascular condition is begun or begins to exert its effects (e.g., during surgery to implant a stent); or generally, as is needed to maintain heart function.
- the period over which the agent is administered can be long term, e.g., for six months or more or a year or more, or short term, e.g., for less than a year, six months, one month, two weeks or less.
- an agent can be administered in a short term, or once, expression of a nucleic acid in the agent can be sustained, e.g., for at least one, two, three, four, or six months.
- Promoters can be selected that are inducible, e.g., to limit or prolong the period of expression.
- the disclosure features a stent coated with, or containing an agent that can increase SERCA expression, e.g., an agent described herein.
- the agent is a nucleic acid.
- the stent can include, e.g., at least lxlO 9 , lxlO 10 , lxlO 11 , lxlO 12 , lxlO 13 , lxlO 14 , lxlO 15 , or lxlO 16 units (e.g., particles), or, for example, between lxlO 9 to lxlO 18 or lxlO 11 to lxlO 16 .
- the agent is a nucleic acid encoding SERCA, e.g.,
- the SERCA encoding nucleic acid is under the control of a heterologous regulatory region, e.g., a heterologous promoter.
- the promoter can be, e.g., a smooth muscle specific promoter, such as a smooth muscle alpha actin promoter, SM22a promoter; cardiac specific promoter, such as a cardiac myosin promoter (e.g., a cardiac myosin light chain 2v promoter), troponin T promoter, or BNP promoter.
- the promoter can also be, e.g., a viral promoter, such as CMV promoter.
- the agent is an antisense nucleic acid at least partially complementary to a phospholamban DNA sequence, preferably a human phospholamban DNA sequence.
- a stent described herein is preferably for use in a blood vessel, it can also be used in other tissues such as those forming a cavity, orifice or duct, in which restenosis can occur. Causes of such restenosis include, for example, organ transplantation.
- a stent described herein, in addition to being coated with, or containing, an agent that increases SERCA expression can also be coated with a second therapeutic agent.
- the stent can also contain one or more of: rapamycin, taxol and actinomycin-D.
- the disclosure features a kit.
- the kit includes: (a) an agent that increases SERCA, e.g., SERCA2a, activity (e.g., SERCA, a nucleic acid encoding SERCA, or an antisense nucleic acid at least partially complementary to a phospholamban nucleic acid), and (b) informational material relating to restenosis.
- the kit includes a stent containing, or coated with, the agent.
- the informational material can include instructions for using the kit to prevent or treat restenosis.
- the disclosure features a stent that includes an antibody (e.g., a full length antibody or an antibody fragment, e.g., a Fab, Fc, scFv, etc).
- the antibody binds to a coat protein of a viral particle, e.g. a viral particle described herein.
- the stent can be used to deliver viral particles that contain any nucleic acid of interest, e.g., a therapeutic nucleic acid, e.g., a nucleic acid described herein.
- the antibody can have an antigen binding site that interacts with a coat protein of an adenovirus, or an adeno-associated virus, or a lentivirus, e.g., a retrovirus.
- a “stent” is a medical device configured for implantation in a body lumen to prevent or inhibit the closing of the lumen.
- a stent can be configured to be implanted in, e.g., a blood vessel such as an artery, or other body cavity, orifice or duct, such as a ureter.
- a stent is typically made of biocompatible metal or plastic.
- a stent "coated with or containing" an agent means a stent having the agent either affixed to its surface or contained within it, so as to permit release of the agent from the stent and, hence, delivery of the agent to tissue in proximity with the stent.
- a stent can also include a slow-release formulation of the agent, e.g., to release the agent over time.
- An agent can be affixed by non-covalent interactions or by covalent interactions, e.g., covalent interactions that are disrupted overtime.
- Ability of an agent to function to a required degree can be to an extent detectable as significant by one skilled in the art or to a statistically significant degree.
- A monitoring of adenoviral infection by GFP fluorescence (485/530 nm) in cultured VSMC (DO, day of infection; D4, day 4 after infection);
- B analysis of expression of SERCA2 by Western blot at D4 in Ad-infected and control VSMC; 40 ⁇ g of total protein extract were loaded on each line;
- C effect of infection by Ad- ⁇ Gal and Ad- S2a on proliferation of VSMC;
- D double immunolabelling with a-SERCA2a (red) and a-PCNA (purple); GFP expression vas monitored by fluorescence 485/530nm.
- FIG. 3 illustrates the effect of SERCA2a expression on NFAT nuclear translocation in one implementation.
- A immunolabelling with a-NFAT: a - Ad bGal infected, b - control, c - Ad S2a infected, d - control + CsA (5 ⁇ M, 24h), e - Ad S2a infected + Tg (l ⁇ M, lh), f -control +Tg (l ⁇ M, lh).
- B western blot analysis of cytosolic and nuclear extract prepared from control and Ad-infected SMC. Immnohybridisation with a-NFATcl.
- C analysis of NFAT-binding activities from control and Ad-infected SMC. EMSA experiments were performed with the P32- labelled NFAT probe.
- FIG. 4 provides a histogram showing the intima thickness under various conditions.
- vascular smooth muscle cells Proliferation of vascular smooth muscle cells (VSMC) is thought to be a key factor in the development of atherosclerosis and restenosis after balloon injury and is associated with dedifferentiation of the VSMC. Alterations in expression of proteins involved in calcium homeostasis have been reported. Differentiated smooth muscle cell exhibits different Ca2+ signals including localized transient release through the ryanodine receptors in the form of Ca2+ sparks and Ca2+ waves of different amplitude and frequency. Proliferation of VSMC is accompanied by replacement of the L-type Ca2+ channels by the T-type, loss of ryanodine receptors and of SERCA2a, and enhanced capacitative Ca2+ entry.
- SERCA e.g., SERCA2a
- the methods described herein e.g., methods of preventing or reducing restenosis by increasing SERCA activity, e.g., by gene transfer of SERCA, can improve calcium handling without causing apoptosis.
- Other advantages of the methods and compositions described herein include: decreased proliferation of smooth muscle cells without causing apoptosis and cell death; lack of toxicity in other tissues; beneficial effects within the myocardium; prevention of smooth muscle death and maintenance of the integrity of the wall.
- SR Sarcoplamic reticulum
- SERCA Ca 2+ ATPase
- the sarcoplasmic reticulum (SR) is an internal membrane system, which plays a critical role in the regulation of cytosolic Ca 2+ concentrations and thus, excitation- contraction coupling in muscle.
- SR sarcoplasmic reticulum
- cardiac cells release of Ca 2+ from the SR leads to / contraction whereas in smooth muscle cells it induces vasorelaxation through activation of Ca 2+ activated potassium channels and hyperpolarisation of the cell.
- Control of the cytosolic Ca 2+ concentration involves the active re-uptake of Ca 2+ into the SR lumen by a Ca 2+ -ATPase.
- SR Ca 2+ - ATPase activity (SERCA2a) is under reversible regulation by phospholamban. Defects in SR Ca 2+ cycling have a crucial role in progression of cardiac hypertrophy and failure. Cardiac hypertrophy as well as its deleterious effects on contractile function can be prevented by activating SR Ca 2+ uptake either by
- SERCA2a gene transfer or by decreasing the inhibitory effect of phospholamban on SERCA 2a (reviewed in Kaprielian et al., 2002, Basic Res Cardiol. 97 Suppl 1:1136- 45).
- the sequence of human SERCA proteins are known in the art (see, e.g., Lytton and MacLennan, 1988, J. Biol. Chem. 263(29), 15024-15031 ; Genbank Accession Nos. NP_001672; P16615; NP_733765).
- nucleic acids described herein can be incorporated into a gene construct to be used as a part of a gene therapy protocol.
- Methods for gene transfer in vivo are known in the art. Approaches include insertion of the subject gene in viral vectors including recombinant retro viruses, adenovirus (e.g., replication deficient, first generation, or gutted, second generation, adenovirus), adeno-associated virus (e.g., any of types 1-6), lentivirus, and herpes simplex virus-1, or recombinant bacterial or eukaryotic plasmids.
- retro viruses including recombinant retro viruses, adenovirus (e.g., replication deficient, first generation, or gutted, second generation, adenovirus), adeno-associated virus (e.g., any of types 1-6), lentivirus, and herpes simplex virus-1, or recombinant bacterial or eukaryotic plasmids.
- Viral vectors transfect cells directly; plasmid DNA can be delivered with the help of, for example, cationic liposomes (lipofectin) or derivatized (e.g. antibody conjugated), polylysine conjugates, gramacidin S, artificial viral envelopes or other such intracellular carriers, as well as direct injection of the gene construct or CaPO 4 precipitation carried out in vivo.
- Gene transfer into cardiovascular tissue has been successful using adenovirus (Ad) vectors with strong, non-tissue specific gene expression cassettes driven by cytomegalovirus (CMV) or Rous sarcoma virus (RSV) promoters.
- CMV cytomegalovirus
- RSV Rous sarcoma virus
- VEGF vascular endothelial cell growth factor
- FGF fibroblast growth factor
- HGF hepatocyte growth factor
- Intra- aorta or intracoronary injection of virus has been used in vivo in animal models, h one study, intracardiac injection of an Ad-SERCA2a viral vector in rats was sufficient to induce physiological improvement in calcium handling. See Miyamoto et al., 2000, Proc. Natl. Acad. Sci. USA 97:793-98.
- Adenoviral vectors have also been used in vivo to express ⁇ 2 adrenergic receptor ( ⁇ -AR) (see Maurice et al. 1999, J. Clin. Invest. 104:21-9 and Shah et al., 2001, Circulation 103:1311).
- ⁇ -AR ⁇ 2 adrenergic receptor
- transduction of all cells in a tissue is not required for improved function.
- expression of the wild type sodium channel in as few as 6-10% of cells within an epithelial sheet lacking a functional sodium channel is sufficient for normal sodium ion transport (Johnson et al, 1992, Nat. Genet 2:21-5). This is known as the bystander effect.
- Tissue specific promoters have been used to increase specificity of myocardial gene expression (Rothmann et al., 1996, Gene Ther. 3:919-26).
- Another strategy to restrict expression of transferred genes to the heart has involved direct injection of a viral vector into the myocardium (Gutzman et al, 1993, Cric. Res. 73: 1202-7; French et al., 1994, Circulation. 90:2414-24).
- Another attempt involved intrapericardial virus vector injection combined with proteinase treatment fromes et al., 1999, Gene Ther. 6:683-8).
- AAV adeno-associated virus
- a subject polynucleotide can also be administered using a non- viral delivery vehicle.
- Non-viral delivery vehicle (also referred to herein as “non-viral vector”) as used herein is meant to include chemical formulations containing naked or condensed polynucleotides (e.g., a formulation of polynucleotides and cationic compounds (e.g., dextran sulfate)), and naked or condensed polynucleotides mixed with an adjuvant such as a viral particle (i.e., the polynucleotide of interest is not contained within the viral particle, but the transforming formulation is composed of both naked polynucleotides and viral particles (e.g., adenovirus particles) (see, e.g., Curiel et al. 1992 Am. J.
- non-viral delivery vehicle can include vectors composed of polynucleotides plus viral particles where the viral particles do not contain the polynucleotide of interest.
- Non-iral delivery vehicles include bacterial plasmids, viral genomes or portions thereof, wherein the polynucleotide to be delivered is not encapsidated or contained within a viral particle, and constructs comprising portions of viral genomes and portions of bacterial plasmids and/or bacteriophages.
- the term also encompasses natural and synthetic polymers and co-polymers.
- the term further encompasses lipid-based vehicles.
- Lipid- based vehicles include cationic liposomes such as disclosed by Feigner et al (U.S. Pat. Nos. 5,264,618 and 5,459,127; PNAS 84:7413-7417, 1987; Annals N.Y. Acad. Sci. 772: 126-139, 1995); they may also consist of neutral or negatively charged phospholipids or mixtures thereof including artificial viral envelopes as disclosed by Schreier et al. (U.S. Pat. Nos. 5,252,348 and 5,766,625).
- Non-viral delivery vehicles include polymer-based carriers.
- Polymer-based carriers may include natural and synthetic polymers and co-polymers. Preferably, the polymers are biodegradable, or can be readily eliminated from the subject.
- Naturally occurring polymers include polypeptides and polysaccharides.
- Synthetic polymers include, but are not limited to, polylysines, and polyethyleneimines (PEI; Boussif et al., PNAS 92:7297-7301, 1995) which molecules can also serve as condensing agents. These carriers may be dissolved, dispersed or suspended in a dispersion liquid such as water, ethanol, saline solutions and mixtures thereof.
- a dispersion liquid such as water, ethanol, saline solutions and mixtures thereof.
- a wide variety of synthetic polymers are known in the art and can be used.
- the gene delivery systems for the therapeutic gene can be introduced into a patient by any of a number of methods, each of which is familiar in the art. For instance, a pharmaceutical preparation of the gene delivery system can be introduced systemically, e.g.
- the gene delivery vehicle can be introduced by catheter (see U.S. Patent 5,328,470) or by stereotactic injection (e.g. Chen et al. (1994) PNAS 91 : 3054-3057).
- the pharmaceutical preparation of the gene therapy construct can consist essentially of the gene delivery system in an acceptable diluent, or can comprise a slow release matrix in which the gene delivery vehicle is imbedded.
- the pharmaceutical preparation can comprise one or more cells which produce the gene delivery system.
- the polynucleotide to be delivered can also be formulated as a DNA- or RNA- liposome complex formulation.
- Such complexes comprise a mixture of lipids which bind to genetic material (DNA or RNA) by means of cationic charge (electrostatic interaction).
- Cationic Hposomes which may be used in the present invention include 3 ⁇ -[N-(N', N'-dimethyl-aminoethane)- -carbamoyl] -cholesterol (DC-Choi), 1,2- bis(oleoyloxy-3-trimethylammonio-pr- opane (DOTAP) (see, for example, WO 98/07408), lysinylphosphatidylethanola- mine (L-PE), lipopolyamines such as lipospermine, N-(2-hydroxyethyl)-N,N-d- imethyl-2,3-bis(dodecyloxy)-l- propanaminium bromide, dimethyl dioctadecyl ammonium bromide (DDAB), dioleoylphosphatidyl ethanolamine (DOPE), dioleoylphosphatidyl choline (DOPC), N(l,2,3-dioleyl
- phospholipids which may be used include phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine, sphingomyelin, phosphatidylinositol, and the like. Cholesterol may also be included.
- the present invention includes within its scope the use of a composition for treating restenosis, comprising an agent that increases SERCA, e.g., SERCA2a, activity.
- the agent can be, e.g., a nucleic acid encoding SERCA in the form of expression vector containing a DNA encoding SERCA2, preferably SERCA2a, in association with a pharmaceutically acceptable carrier, excipient or other additive, if necessary.
- the agent is an antisense nucleic acid at least partially complementary to a phospholamban nucleic acid sequence in association with a pharmaceutically acceptable carrier, excipient or other additive, if necessary.
- Suitable carriers, excipients, and diluents are lactose, dextrose, sucrose, sorbitol, mannitol, starches, gum acacia, alginates, gelatin, calcium phosphate, calcium silicate, cellulose, methyl cellulose, microcrystalline cellulose, polyvinylpyrrolidone, water, methylhydroxybenzoates, propylhydroxybenzoates, talc, magnesium stearate and mineral oil.
- the compositions may additionally include lubricating agents, wetting agents, flavoring agents, emulsifiers, preservatives and the like.
- compositions described herein can be formulated so as to provide quick, sustained or delayed release of the active ingredient after administration to a patient by employing any of the procedures well known in the art.
- the agent is formulated for intracardiac or intra vessel administration. Such direct administration can be accomplished thorough, e.g., coating the agent on a stent to be implanted into a vessel of the subject.
- the effective amount of a nucleic DNA encoding SERCA2a as an active ingredient may range from about 0.05 to 500 mg/kg, preferably 0.5 to 50 mg/kg body weight, and can be administered in a single dose or in divided doses.
- the amount of the active ingredient actually administered ought to be determined in light of various relevant factors including the condition to be treated, the age and weight of the individual patient, and the severity of the patient's symptom; and, therefore, the above dose should not be intended to limit the scope of the invention in any way.
- the invention also includes a stent coated with, or containing, an agent that increase SERCA, preferably SERCA2a, activity, e.g., an agent described herein.
- an agent that increase SERCA preferably SERCA2a
- Methods for preparing stents (both biodegradable and non-biodegradable) for delivering a therapeutic agent are well known (see, e.g., U.S. Pat. Nos. 5,163,952, 5,304,121, 6,391,052, 6,387,124, 6,379,382, and 6,358,556, 6,605,110, 6,605,114, , 6,572,645, 6,569,194, 6,545,748, 6,541,116, 6,527,801, 6,506,437).
- a stent described herein is coated with a therapeutic agent, e.g., an agent described herein, such as a SERCA nucleic acid described herein, using techniques known in the art.
- the stent is a stainless steel stent or nytinol mesh like devices.
- a stent can be delivered into the coronary artery on a catheter during a PCI procedure (percutaneous coronary intervention).
- a stent can be deployed in the artery by either expansion by a balloon or by a self expanding delivery design.
- Exemplary commercially available stents include Gianturco-Roubin Stents (e.g., from Cook Cardiology), Multilink, Duet, Tetra, Penta, Zeta Stents(e.g., from Guidant); Nir, Wall Stents, Taxus (e.g., from SCJJVLED/Boston Scientific), GFX/S series Stents (e.g., from Medtronic/ AVE), velocity and Cypher stents (e.g., from Johnson & Johnson/Cordis)
- a stent can be coated with a polymeric cation that can mediate nucleic acid condensation or compaction, e.g., as described in U.S. 6,596,699.
- Linear polycations such as poly-L-lysine, polyornithine, polyarginine and the like can be used.
- the polymers may be homopolymers, such as polylysine, polyornithine, or polyarginine, or may be heteropolymers, including random polymers formed of lysine, ornithine, arginine and the like.
- More complex molecules may also be employed as polycations, such as branched or linear polyethylenimine and the like.
- Any of a variety of naturally occurring nucleic acid binding agents may be employed, such as spermine or spermidine, and are including within the definition of polycation.
- Protamine can similarly be employed, as can any of a variety of histones.
- Polyamidoamine dendrimers may similarly be employed, wherein terminal amino groups bind the nucleic acid by electrostatic means, resulting in positively charged condensates.
- the polycation may be specifically modified to provide optimal characteristics to form the desired condensate. For example, a repeating lysine chain of 18 residues followed by a tryptophan and an alkylated cysteine residue has been reported to form condensates with properties at least equal to polylysine. McKenzie et al., J. Peptide Res. 54:311-318 (1999).
- the polycation is positively charged, and has a net positive charge at about pH 6 to about 8 or has more than about five positively charged residues.
- the polycation has a higher number of positive charges compared to the number of negative charges.
- a polycation includes natural nucleic acid-binding proteins and recombinant nucleic acid-binding protein, such as homo- or hetero-polymers of amino acids or synthetic compounds that bind to one or more nucleic acid sequences found within natural or recombinant nucleic acid molecules and results in nucleic acid condensation.
- An additional method of coating a therapeutic nucleic acid onto a medical device such as a stent involves coating the medical device with a swellable hydrogel polymer as described, e.g., in U.S. 5,674,192 or 6,409,716.
- the hydrogel coating is characterized by the ability to incorporate a substantial amount of the nucleic acid,, typically in aqueous solution form, and is swellable such that the aqueous solution can be effectively squeezed out of the coating when pressure is applied, e.g., by inflation or expansion of the stent.
- Administration of the drug in this way enables the drug to be site-specific, such that release of high concentrations can be limited to direct application to the affected tissue.
- Other methods of coupling a therapeutic agent, such nucleic acid, to a stent or other medical device are known in the art, see for example, U.S. 6,024,918, U.S. 6,506,408; U.S. 5,932,299.
- a stent described herein in addition to being coated with, or containing, an agent that increases SERCA expression, can also be coated with a second therapeutic agent.
- the stent can also contain one or more of: rapamycin, taxol and actinomycin-D, a thrombin inhibitor, an antithrombogenic agent, a thrombolytic agent, a fibrinolytic agent, a vasospasm inhibitor, a calcium channel blocker, a vasodilator, an antihypertensive agent, an antimicrobial agent, an antibiotic, an inhibitor of surface glycoprotein receptors, an antiplatelet agent, an antimitotic, a microtubule inhibitor, an antisecretory agent, an actin inhibitor, a remodeling inhibitor, an antisense nucleotide, an antimetabohte, an antiprohferative, an anticancer chemotherapeutic agent, an anti-inflammatory steroid or non-steroidal antiinflammatory agent, an immunosuppressive agent,
- the subject is also administered a second agent, e.g., separately from the agent that increases SERCA activity.
- a second agent e.g., separately from the agent that increases SERCA activity.
- the subject can be orally administered aspirin or an oral anti-platelet drug (e.g., PLAVIX® or TICLLD®).
- kits The agent described herein (e.g., SERCA nucleic acid or polypeptide) can be provided in a kit.
- the kit includes (a) the agent, e.g., a composition that includes the agent, (b) informational material, and optionally (c) a stent.
- the informational material can be descriptive, instructional, marketing or other material that relates to the methods described herein and/or the use of the agent for the methods described herein. For example, the informational material relates to restenosis.
- the informational material can include instructions to administer the agent in a suitable manner to perform the methods described herein, e.g., in a suitable dose, dosage form, or mode of administration (e.g., a dose, dosage form, or mode of administration described herein).
- the informational material can include instructions to administer the agent to a suitable subject, e.g., a human, e.g., a human having, or at risk for, restenosis.
- the material can include instructions to administer the agent to a subject who has had, is having or will have angioplasty.
- the informational material of the kits is not limited in its form.
- the informational material e.g., instructions
- the informational material is provided in printed matter, e.g., a printed text, drawing, and/or photograph, e.g., a label or printed sheet.
- the informational material can also be provided in other formats, such as computer readable material, video recording, or audio recording.
- the informational material of the kit is contact information, e.g., a physical address, email address, website, or telephone number, where a user of the kit can obtain substantive information about the agent and/or its use in the methods described herein.
- the informational material can also be provided in any combination of formats.
- the composition of the kit can include other ingredients, such as a solvent or buffer, a stabilizer, a preservative, and/or a second agent for treating a condition or disorder described herein.
- the other ingredients can be included in the kit, but in different compositions or containers than the agent.
- the kit can include instructions for admixing the agent and the other ingredients, or for using the agent together with the other ingredients.
- the agent can be provided in any form, e.g., liquid, dried or lyophilized form. It is preferred that the agent be substantially pure and/or sterile.
- the liquid solution preferably is an aqueous solution, with a sterile aqueous solution being preferred.
- the agent When the agent is provided as a dried form, reconstitution generally is by the addition of a suitable solvent.
- the solvent e.g., sterile water or buffer, can optionally be provided in the kit.
- the kit can include one or more containers for the composition containing the agent.
- the kit contains separate containers, dividers or compartments for the composition and informational material.
- the composition can be contained in a bottle, vial, or syringe, and the informational material can be contained in a plastic sleeve or packet.
- the separate elements of the kit are contained within a single, undivided container.
- the composition is contained in a bottle, vial or syringe that has attached thereto the informational material in the form of a label.
- the kit includes a plurality (e.g., a pack) of individual containers, each containing one or more unit dosage forms (e.g., a dosage form described herein) of the agent.
- the kit includes a plurality of syringes, ampules, foil packets, or blister packs, each containing a single unit dose of the agent.
- the containers of the kits can be air tight and/or waterproof.
- the kit optionally includes a device suitable for administration of the composition, e.g., a stent, syringe, or any useful delivery device. In a preferred embodiment, the device is a stent.
- Amino acid sequence variants of SERCA or fragments thereof can be prepared by a number of techniques, such as random mutagenesis of DNA which encodes a
- Useful methods also include PCR mutagenesis and saturation mutagenesis.
- a library of random amino acid sequence variants can also be generated by the synthesis of a set of degenerate oligonucleotide sequences.
- PCR Mutagenesis h PCR mutagenesis reduced Taq polymerase fidelity is used to introduce random mutations into a cloned fragment of DNA (Leung et al., 1989, Technique 1:11-15). This is a very powerful and relatively rapid method of introducing random mutations.
- the DNA region to be mutagenized is amplified using the polymerase chain reaction (PCR) under conditions that reduce the fidelity of DNA synthesis by Taq DNA polymerase, e.g., by using a dGTP/dATP ratio of five and adding Mn2 + to the PCR reaction.
- the pool of amplified DNA fragments are inserted into appropriate cloning vectors to provide random mutant libraries.
- Saturation Mutagenesis Saturation mutagenesis allows for the rapid introduction of a large number of single base substitutions into cloned DNA fragments (Mayers et al., 1985, Science 229:242).
- This technique includes generation of mutations, e.g., by chemical treatment or irradiation of single-stranded DNA in vitro, and synthesis of a complimentary DNA strand.
- the mutation frequency can be modulated by modulating the severity of the treatment, and essentially all possible base substitutions can be obtained. Because this procedure does not involve a genetic selection for mutant fragments both neutral substitutions, as well as those that alter function, are obtained. The distribution of point mutations is not biased toward conserved sequence elements.
- a library of homologs can also be generated from a set of degenerate oligonucleotide sequences. Chemical synthesis of a degenerate sequences can be carried out in an automatic DNA synthesizer, and the synthetic genes then ligated into an appropriate expression vector. The synthesis of degenerate oligonucleotides is known in the art (see for example, Narang, SA (1983) Tetrahedron 39:3; Itakura et al. (1981) Recombinant DNA, Proc 3rd Cleveland Sympos. Macromolecules, ed. AG Walton, Amsterdam: Elsevier pp273-289; Itakura et al. (1984) Annu. Rev.
- Non-random or directed mutagenesis techniques can be used to provide specific sequences or mutations in specific regions. These techniques can be used to create variants that include, e.g., deletions, insertions, or substitutions, of residues of the known amino acid sequence of a protein.
- the sites for mutation can be modified individually or in series, e.g., by (1) substituting first with conserved amino acids and then with more radical choices depending upon results achieved, (2) deleting the target residue, or (3) inserting residues of the same or a different class adjacent to the located site, or combinations of options 1-3.
- Alanine scanning mutagenesis is a useful method for identification of certain residues or regions of the desired protein that are preferred locations or domains for mutagenesis, Cunningham and Wells (Science 244:1081-1085, 1989).
- a residue or group of target residues are identified (e.g., charged residues such as Arg, Asp, His, Lys, and Glu) and replaced by a neutral or negatively charged amino acid (most preferably alanine or polyalanine).
- Replacement of an amino acid can affect the interaction of the amino acids with the surrounding aqueous environment in or outside the cell.
- Those domains demonstrating functional sensitivity to the substitutions are then refined by introducing further or other variants at or for the sites of substitution.
- the site for introducing an amino acid sequence variation is predetermined, the nature of the mutation per se need not be predetermined.
- alanine scanning or random mutagenesis may be conducted at the target codon or region and the expressed desired protein subunit variants are screened for the optimal combination of desired activity.
- Oligonucleotide-mediated mutagenesis is a useful method for preparing substitution, deletion, and insertion variants of DNA, see, e.g., Adelman et al., (DNA
- the desired DNA is altered by hybridizing an oligonucleotide encoding a mutation to a DNA template, where the template is the single-stranded form of a plasmid or bacteriophage containing the unaltered or native DNA sequence of the desired protein.
- a DNA polymerase is used to synthesize an entire second complementary strand of the template that will thus incorporate the oligonucleotide primer, and will code for the selected alteration in the desired protein DNA.
- oligonucleotides of at least 25 nucleotides in length are used.
- An optimal oligonucleotide will have 12 to 15 nucleotides that are completely complementary to the template on either side of the nucleotide(s) coding for the mutation. This ensures that the oligonucleotide will hybridize properly to the single- stranded DNA template molecule.
- the oligonucleotides are readily synthesized using techniques known in the art such as that described by Crea et al. (Proc. Natl. Acad. Sci. (1978) USA, 75: 5765).
- Cassette Mutagenesis Another method for preparing variants, cassette mutagenesis, is based on the technique described by Wells et al. (Gene, 34:315[1985J).
- the starting material is a plasmid (or other vector) which includes the protein subunit DNA to be mutated.
- the codon(s) in the protein subunit DNA to be mutated are identified. There must be a unique restriction endonuclease site on each side of the identified mutation site(s). If no such restriction sites exist, they may be generated using the above-described oligonucleotide-mediated mutagenesis method to introduce them at appropriate locations in the desired protein subunit DNA. After the restriction sites have been introduced into the plasmid, the plasmid is cut at these sites to linearize it.
- a double- stranded oligonucleotide encoding the sequence of the DNA between the restriction sites but containing the desired mutation(s) is synthesized using standard procedures. The two strands are synthesized separately and then hybridized together using standard techniques.
- This double-stranded oligonucleotide is referred to as the cassette.
- This cassette is designed to have 3' and 5' ends that are comparable with the ends of the linearized plasmid, such that it can be directly ligated to the plasmid.
- This plasmid now contains the mutated desired protein subunit DNA sequence.
- Combinatorial Mutagenesis can also be used to generate variants.
- the amino acid sequences for a group of homologs or other related proteins are aligned, preferably to promote the highest homology possible. All of the amino acids which appear at a given position of the aligned sequences can be selected to create a degenerate set of combinatorial sequences.
- the variegated library of variants is generated by combinatorial mutagenesis at the nucleic acid level, and is encoded by a variegated gene library.
- a mixture of synthetic oligonucleotides can be enzymatically ligated into gene sequences such that the degenerate set of potential sequences are expressible as individual peptides, or alternatively, as a set of larger fusion proteins containing the set of degenerate sequences.
- Primary High-Through-Put Methods for Screening Libraries of Peptide Fragments or Homologs Various techniques are known in the art for screening peptides, e.g., synthetic peptides, e.g., small molecular weight peptides (e.g., linear or cyclic peptides) or generated mutant gene products.
- Techniques for screening large gene libraries often include cloning the gene library into replicable expression vectors, transforming appropriate cells with the resulting library of vectors, and expressing the genes under conditions in which detection of a desired activity, assembly into a trimeric molecules, binding to natural ligands, e.g., a receptor or substrates, facilitates relatively easy isolation of the vector encoding the gene whose product was detected.
- Each of the techniques described below is amenable to high through-put analysis for screening large numbers of sequences created, e.g., by random mutagenesis techniques.
- Two hybrid (interaction trap) assays can be used to identify a protein that interacts with SERCA. These may include, e.g., agonists, superagonists, and antagonists of SERCA. (The subject protein and a protein it interacts with are used as the bait protein and fish proteins.). These assays rely on detecting the reconstitution of a functional transcriptional activator mediated by protein-protein interactions with a bait protein. In particular, these assays make use of chimeric genes which express hybrid proteins.
- the first hybrid comprises a DNA-binding domain fused to the bait protein, e.g., SERCA or active fragments thereof.
- the second hybrid protein contains a transcriptional activation domain fused to a "fish" protein, e.g.
- the fish and bait proteins are able to interact, they bring into close proximity the DNA-binding and transcriptional activator domains. This proximity is sufficient to cause transcription of a reporter gene which is operably linked to a transcriptional regulatory site which is recognized by the DNA binding domain, and expression of the marker gene can be detected and used to score for the interaction of the bait protein with another protein.
- Display Libraries In one approach to screening assays, the candidate peptides are displayed on the surface of a cell or viral particle, and the ability of particular cells or viral particles to bind an appropriate receptor protein via the displayed product is detected in a "panning assay".
- the gene library can be cloned into the gene for a surface membrane protein of a bacterial cell, and the resulting fusion protein detected by panning (Ladner et al., WO 88/06630; Fuchs et al. (1991) Bio/Technology 9:1370- 1371; and Goward et al. (1992) TIBS 18:136-140).
- panning Ladner et al., WO 88/06630; Fuchs et al. (1991) Bio/Technology 9:1370- 1371; and Goward et al. (1992) TIBS 18:136-140.
- This technique was used in Sahu et al. (1996) J. Immunology 157:884-891, to isolate a complement inhibitor.
- a detectably labeled ligand can be used to score for potentially functional peptide homologs.
- Fluorescently labeled ligands e.g., receptors
- fluorescently labeled ligands allows cells to be visually inspected and separated under a fluorescence microscope, or, where the morphology of the cell permits, to be separated by a fluorescence-activated cell sorter.
- a gene library can be expressed as a fusion protein on the surface of a viral particle. For instance, in the filamentous phage system, foreign peptide sequences can be expressed on the surface of infectious phage, thereby conferring two significant benefits.
- phage can be applied to affinity matrices at concentrations well over 10 ⁇ 3 phage per milliliter, a large number of phage can be screened at one time.
- the group of almost identical E. coli filamentous phages Ml 3, fd., and fl are most often used in phage display libraries. Either of the phage gill or gVIII coat proteins can be used to generate fusion proteins without disrupting the ultimate packaging of the viral particle.
- LamB the outer membrane protein
- Oligonucleotides have been inserted into plasmids encoding the LamB gene to produce peptides fused into one of the extracellular loops of the protein. These peptides are available for binding to ligands, e.g., to antibodies, and can elicit an immune response when the cells are administered to animals.
- Other cell surface proteins e.g., OmpA (Schorr et al. (1991) Vaccines 91, pp. 387-392), Pho ⁇ (Agterberg, et al.
- Peptides can be fused to pilin, a protein which polymerizes to form the pilus-a conduit for interbacterial exchange of genetic information (Thiry et al.
- Lacl-peptide fusion protein Under the controlled induction by arabinose, a Lacl-peptide fusion protein is produced. This fusion retains the natural ability of Lad to bind to a short DNA sequence known as LacO operator (LacO). By installing two copies of LacO on the expression plasmid, the Lacl- peptide fusion binds tightly to the plasmid that encoded it. Because the plasmids in each cell contain only a single oligonucleotide sequence and each cell expresses only a single peptide sequence, the peptides become specifically and stably associated with the DNA sequence that directed its synthesis.
- LacO operator LacO operator
- the cells of the library are gently lysed and the peptide-DNA complexes are exposed to a matrix of immobilized receptor to recover the complexes containing active peptides.
- the associated plasmid DNA is then reintroduced into cells for amplification and DNA sequencing to determine the identity of the peptide ligands.
- a large random library of dodecapeptides was made and selected on a monoclonal antibody raised against the opioid peptide dynorphin B.
- a cohort of peptides was recovered, all related by a consensus sequence corresponding to a six- residue portion of dynorphin B. (Cull et al. (1992) Proc. Natl. Acad. Sci.
- a second difference is the set of biological biases affecting the population of peptides actually present in the libraries.
- the Lad fusion molecules are confined to the cytoplasm of the host cells.
- the phage coat fusions are exposed briefly to the cytoplasm during translation but are rapidly secreted through the inner membrane into the periplasmic compartment, remaining anchored in the membrane by their C-terminal hydrophobic domains, with the N-termini, containing the peptides, protruding into the periplasm while awaiting assembly into phage particles.
- the peptides in the Lad and phage libraries may differ significantly as a result of their exposure to different proteolytic activities.
- the phage coat proteins require transport across the inner membrane and signal peptidase processing as a prelude to incorporation into phage. Certain peptides exert a deleterious effect on these processes and are underrepresented in the libraries (Gallop et al. (1994) J. Med. Chem. 37(9):1233-1251). These particular biases are not a factor in the Lacl display system. The number of small peptides available in recombinant random libraries is enormous. Libraries of 10 7 -10 9 independent clones are routinely prepared. Libraries as large as 10 11 recombinants have been created, but this size approaches the practical limit for clone libraries. This limitation in library size occurs at the step of transforming the DNA containing randomized segments into the host bacterial cells.
- RNA from the bound complexes is recovered, converted to cDNA, and amplified by PCR to produce a template for the next round of synthesis and screening.
- the polysome display method can be coupled to the phage display system. Following several rounds of screening, cDNA from the enriched pool of polysomes was cloned into a phagemid vector.
- This vector serves as both a peptide expression vector, displaying peptides fused to the coat proteins, and as a DNA sequencing vector for peptide identification.
- a DNA sequencing vector for peptide identification.
- one or more residues in a SERCA protein can differ from wild-type or can be deleted.
- the N-terminal first and/or second residue e.g., after removal of a signal sequence
- the C-terminal-most first and/or second residue can be deleted.
- Selected transmembrane residues can be altered, e.g., with similar hydrophobic residues.
- the protein may include other substitutions, e.g., conservative substitutions.
- a "conservative amino acid substitution” is one in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art.
- amino acids with basic side chains e.g., lysine, arginine, histidine
- acidic side chains e.g., aspartic acid, glutamic acid
- uncharged polar side chains e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine
- nonpolar side chains e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan
- beta-branched side chains e.g., threonine, valine, isoleucine
- aromatic side chains e.g., tyrosine, phenylalanine, tryptophan, histidine
- framework and CDR amino acid residues it is possible for many framework and CDR amino acid residues to include one or more conservative substitutions.
- Secondary Screens for Inhibitors of the Alternative Pathway The high through-put assays described above can be followed (or substituted) by secondary screens, e.g., the following screens, in order to identify biological activities which will, e.g., allow one skilled in the art to differentiate agonists from antagonists.
- the type of a secondary screen used will depend on the desired activity that needs to be tested.
- an assay can be developed in which the ability to increase or mimic SERCA activity can be used to identify SERCA agonists from a group of peptide fragments isolated though one of the primary screens described above.
- SERCA can bind to a SERCA binding partner, e.g., phospholamban or sarcolipin.
- a SERCA binding partner e.g., phospholamban or sarcolipin.
- the ability of a SERCA variant to bind a binding partner, e.g., phospholamban or sarcolipin, is an assayable activity of SERCA function.
- a binding assay e.g., a binding assay described herein, can be used to evaluate: (a) the ability of a test agent to bind SERCA; (b) the ability of a test agent to inhibit binding of SERCA to a binding partner, e.g., the ability of a test agent to inhibit or disrupt SERCA binding to phospholamban or sarcolipin; the ability of a test agent to stabilize or increase binding of a complement component to a binding partner, e.g., the ability of a test agent to stabilize or increase SERCA binding to phospholamban or sarcolipin.
- SERCA e.g., human SERCA
- SERCA standard binding assays known in the art, which include, but are not limited to: affinity chromatography, size exclusion chromatography, gel filtration, fluid phase binding assay; ELISA (e.g., competition ELISA), immunoprecipitation.
- Peptide Mimetics The invention also provides for production of domains of SERCA, to generate mimetics, e.g. peptide or non-peptide agents, e.g., agonists.
- mimetics e.g. peptide or non-peptide agents, e.g., agonists.
- Non-hydrolyzable peptide analogs of critical residues can be generated using benzodiazepine (e.g., see Freidinger et al. in Peptides: Chemistry and Biology, G.R. Marshall ed., ESCOM Publisher: Leiden, Netherlands, 1988), azepine (e.g., see Huffman et al. in Peptides: Chemistry and Biology, G.R. Marshall ed., ESCOM Publisher: Leiden, Netherlands, 1988), substituted gama lactam rings (Garvey et al.
- an agent that modulates SERCA signaling e.g., an agent described herein, can be administered to a subject by standard methods.
- the agent can be administered by any of a number of different routes including by introduction into a lumen of the circulatory system, e.g., the lumen of an artery, vein, or organ, e.g., the heart.
- the agent is administered by injection, e.g., intra- arterially, intramuscularly, or intravenously.
- the agent can be packaged in a viral particle, and formulated with materials compatible with maintaining ability of the viral particle to introduce the nucleic acid into a cell, e.g., when the viral particle is introduced into a subject.
- the agent e.g., a SERCA nucleic acid molecule, polypeptide, fragments or analog, modulators (e.g., organic compounds and antibodies (also referred to herein as "active compounds”) can be incorporated into pharmaceutical compositions suitable for administration to a subject, e.g., a human.
- compositions typically include the polypeptide, nucleic acid molecule, modulator, or antibody and a pharmaceutically acceptable carrier.
- pharmaceutically acceptable carrier is intended to include any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like, compatible with pharmaceutical administration.
- the use of such media and agents for pharmaceutically active substances are known. Except insofar as any conventional media or agent is incompatible with the active compound, such media can be used in the compositions of the invention.
- Supplementary active compounds can also be incorporated into the compositions.
- a pharmaceutical composition can be formulated to be compatible with its intended route of administration.
- Solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. pH can be adjusted with acids or bases, such as hydrochloric acid or sodium hydroxide.
- a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents
- antibacterial agents such as benzyl alcohol or methyl parabens
- antioxidants
- compositions suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion.
- suitable carriers include physiological saline, bacteriostatic water, Cremophor ELTM (BASF, Parsippany, NJ) or phosphate buffered saline (PBS). In all cases, the composition must be sterile and should be fluid to the extent that easy syringability exists.
- the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), and suitable mixtures thereof.
- the proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
- Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like, h many cases, it will be preferable to include isotonic agents, for example, sugars, polyalcohols such as manitol, sorbitol, sodium chloride in the composition.
- isotonic agents for example, sugars, polyalcohols such as manitol, sorbitol, sodium chloride in the composition.
- Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, aluminum monostearate and gelatin.
- Sterile injectable solutions can be prepared by incorporating the active compound (e.g., an agent described herein) in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization.
- dispersions are prepared by incorporating the active compound into a sterile vehicle which contains a basic dispersion medium and the required other ingredients from those enumerated above.
- the preferred methods of preparation are vacuum drying and freeze-drying which yields a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.
- the active compounds are prepared with carriers that will protect the compound against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems.
- a controlled release formulation including implants and microencapsulated delivery systems.
- Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid. Methods for preparation of such formulations will be apparent to those skilled in the art. The materials can also be obtained commercially from Alza Corporation and Nova Pharmaceuticals, Inc.
- Liposomal suspensions (including hposomes targeted to infected cells with monoclonal antibodies to viral antigens) can also be used as pharmaceutically acceptable carriers. These can be prepared according to methods known to those skilled in the art, for example, as described in U.S.
- compositions can be included in a container, pack, or dispenser together with instructions for administration.
- the pharmaceutical composition is injected into an affected vessel, e.g., an artery, e.g., a coronary artery.
- the pharmaceutical composition is delivered in association with a medical device that is introduced into an affected vessel, e.g., a stent that is introduced into the affected vessel.
- Example 1 SERCA 2a expression in growing VSMC inhibits proliferation
- Rat aortic SMC were isolated from the media of the thoracic aorta from male Wistar rats as and cultured in DMEM supplemented with 1% penicillin-streptomycin- amphotericin mixture (ICN) and 10% fetal calf serum (FCS). At confluence they were passaged using trypsin. Cells between passage 2 to 8 were used.
- the rat VSMC were infected with adenovirus SERCA2a vector essentially as described in del Monte et al., 2001, Circulation 104:1424.
- human SERCA2a cDNA was subcloned into the adenoviral shuttle vector (pAd.TRACK), which uses the cytomegalovirus (CMV) long terminal repeat as a promoter to make Ad-S2a vector.
- CMV cytomegalovirus
- the shuttle vector used also has a concomitant green fluorescent protein (GFP) under the control of a separate CMV promoter.
- GFP green fluorescent protein
- An adenovirus containing both ⁇ -galactosidase and GFP controlled by separate CMV promoters (Ad- ⁇ Gal-GFP) was used as control.
- the adenoviruses were propagated in 293 cells.
- the recombinant adenoviruses were tested for the absence of wild-type virus by polymerase chain reaction of the early transcriptional unit El .
- Adenoviral infection was followed by monitoring the fluorescence of GFP. Significant increase in fluorescence was observed 4 days after infection (Fig 2A).
- Control cells as well as Ad- ⁇ Gal-GFP infected cells did not express SERCA 2a.
- a high amount of SERCA 2a was present in Ad S2a-infected cells without much change in the level of SERCA 2b (Fig 2B).
- Proliferation of VSMC was measured by using the colorimetric-based CELLTITER96® Cell Proliferation Assay kit (Promega) according to manufacturer instructions.
- Example 2 SERCA 2a expression blocks the cell cycle at the Gl phase and prevents entry in the S phase
- the absence of PCNA in Ad-S2a-infected cells indicated that the cells did not enter the S phase.
- VSMCs were harvested by trypsinization and stained with propidium iodide and the DNA content and cell cycle were determined. Fluorescence of the nuclei after labelling with propidium iodide was analysed using a flowcytometer. In the control situation and in Ad- ⁇ Gal-GFP infected cells the percentage of S gated events was approximately 50% and 46% respectively, whereas it was only approximately 30% in Ad-S2a-infected cells. No cells were in the subGl, indicating the absence of apoptosis.
- Example 3 SERCA 2a expression prevents NFAT activation SERCA2a overexpression inhibits smooth muscle activation of NFAT and calcineurin, downstream markers of hypertrophy and proliferation (FIG. 3)
- Example 4 Adenovirus-mediated expression of SERCA2a in balloon-injured rat carotid arteries decreases restenosis
- Fourteen days after infection quantitative morphometry was performed on 5- ⁇ m sections from the transduced segment by an investigator blinded to the experimental procedure.
- the intima/media ratio was significantly lower in arteries infected with Ad-S2a (0.16 ⁇ 0.08) than in control infected arteries (0.73 ⁇ 0.12).
- PO.05 for both.
- Immunofluorescence was performed on cell culture or cryosections for the carotid artery. Proteins were visualized by using either secondary antibodies directly conjugated to Texas Red or the biotin/streptavidin-Texas Red conjugated amplification method (Amersham). Antibodies to SERCA 2a and 2b were previously described. Anti-PCNA (proliferating nuclear antigen) was from Abeam (UK), a-GFP and a-NFATcl (K-18) were from Santa-Cruz. Nuclei were stained with Hoechst.
- the control solution contained (mmol/L): NaCl, 116; KCL, 5.6; CaC12, 1.8; MgC12, 1.2; NaHCO3, 5; NaH2PO4, 1; HEPES, 20; pH 7.3.
- Caffeine (10 mmol/L), ATP (1, 10 and 100 ⁇ mol/L) or 2,5-di-(t-butyl)-l,4-benzo- hydroquinone (tBHQ, 50 ⁇ mol/L) were used in the test solution.
- the excitation light was supplied by a high pressure 100 W xenon arc lamp and the 340 and 380 nm wavelengths selected by a monochromator (Cairn Research Ltd, Faversham, Kent, UK).
- Fluorescence images were collected every 2 seconds by a Sensicam QE CCD camera (PCO Computer Optics GmbH, Kelheim, Germany), digitized, and integrated in real time by an image processor (Metafluor, Princeton, NJ, USA). 340 and 380 background fluorescence signals were collected at the same rate and subsequently subtracted from respective fluorescent images. Results ( ⁇ F/F) were expressed as ratios between 340 and 380 fluorescence signals measured during a response divided by the ratio measured in resting conditions, i.e. before the addition of an agent.
- Electromobility shift assay was performed using 0.5 ng of 32 P-labelled double-stranded NFAT probe (NFATc gel shift oligonucleotide, Santa Cruz, sc-2577) and 15 ⁇ g of nuclear extracts. Reaction mixtures were subjected to electrophoresis on a 5% polyacrylamide gel in non-denaturing conditions.
- Example 6 We evaluated the effect of SERCA2a gene transfer on blood vessels in rats after balloon injury. We found that, compared to controls, SERCA2a gene transfer can prevent formation of a neointima.
- SERCA 2a was analysed by immunofluorescence using a rabbit antiS2a antibody followed by and anti-rabbit - TRITC secondary antibody.
- Four groups were considered: 1) Non injured, non infected corresponding to the right carotids, 2) Injured, non-infected corresponding to the left carotid were no GFP labelling could be detected, 3) Injured, infected with ⁇ -Gal and 4) injured infected with S2a.
- the left carotids included in those two groups displayed clear GFP labelling on unfixed sections.
Abstract
Restenosis in a subject can be treated by administering to a tissue, e.g., a blood vessel, of the subject an agent that increases SERCA activity. For example, a stent that is coated with the agent can be introduced into a blood vessel.
Description
METHODS OF TREATING RESTENOSIS
CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S.S.N. 60/499,705, filed September 3,
2003, the contents of which are hereby incorporated by reference in its entirety.
BACKGROUND Coronary artery disease (CAD) is the leading cause of mortality and morbidity in the developed world. CAD is widely treated by implantation of stents (e.g., balloon stents) in the coronary artery, ϋi-stent restenosis, the recurrence of constriction of an artery following efforts to dilate it, is a common side effect, affecting 20% to 40% of patients by 6 months after percutaneous coronary interventions (PCI), with neointimal hyperplasia being the primary cause. Rapamycin (sirolimus), an antibiotic that inhibits cell migration and proliferation, is effective in reducing restenosis. However, prolonged exposure of smooth muscle cells to rapamycin results in the development of resistance to the drug (Luo et al., 1996, Mol. Cell. Biol. 16: 6744-6751).
SUMMARY We have discovered, inter alia, that expression (e.g., overexpression) of sarcoplasmic reticulum (SR) Ca2+ ATPase (SERCA) inhibits vascular smooth muscle cell (VSMC) proliferation in vitro and reduces restenosis in vivo. Accordingly, in one aspect, the disclosure features a method of treating restenosis in a subject, e.g., a human. The method includes: (a) identifying a subject in need of treatment for restenosis (e.g., a subject who has had angioplasty, or a subject who has had a stent placed in a body cavity, such as a blood vessel); and administering to a tissue, e.g., a blood vessel, of the subject an agent that increases SERCA activity in an amount sufficient to reduce or prevent restenosis in the subject. In a preferred embodiment, SERCA is SERCA1, e.g., SERCAla or SERCAlb; SERCA2, e.g., SERCA2a or SERCA2b; or SERCA3, but preferably SERCA2a. The
agent may also be administered in an amount effective to prevent endothelial cell proliferation or neointima formation. The agent can be, e.g., a SERCA polypeptide or a functional fragment, variant or analog thereof having a SERCA activity, e.g., ATPase activity; a peptide or protein agonist of SERCA that increases the activity, e.g., the ATPase activity of SERCA (e.g., by increasing or stabilizing binding of SERCA to a binding partner, e.g., phospholamban); a small molecule that increases expression of SERCA, e.g., by binding to the promoter region of the SERCA gene; an antibody, e.g., an antibody (e.g., an intrabody) that binds to and stabilizes or assists the binding of SERCA to a SERCA binding partner (e.g., a SERCA binding partner described herein); or a nucleotide sequence encoding a SERCA polypeptide or functional fragment or analog thereof. The nucleotide sequence can be a genomic sequence or a cDNA sequence. The nucleotide sequence can include: a SERCA coding region; a promoter sequence, e.g., a promoter sequence from a SERCA gene or from another gene; an enhancer sequence; untranslated regulatory sequences, e.g., a 5' untranslated region (UTR), e.g., a 5'UTR from a SERCA gene or from another gene, a 3' UTR, e.g., a 3'UTR from a SERCA gene or from another gene; a polyadenylation site; an insulator sequence. In another embodiment, the level of SERCA protein is increased by increasing the level of expression of an endogenous SERCA gene, e.g., by increasing transcription of the SERCA gene or increasing SERCA mRNA stability, i a preferred embodiment, transcription of the SERCA gene is increased by: altering the regulatory sequence of the endogenous SERCA gene, e.g., by the addition of a positive regulatory element (such as an enhancer or a DNA-binding site for a transcriptional activator); the deletion of a negative regulatory element (such as a DNA-binding site for a transcriptional repressor) and/or replacement of the endogenous regulatory sequence, or elements therein, with that of another gene, thereby allowing the coding region of the SERCA gene to be transcribed more efficiently. In a preferred embodiment, the agent is a vector that includes a nucleic acid encoding SERCA, e.g., SERCA1, e.g., SERCAla or SERCAlb; SERCA2, e.g., SERCA2a or SERCA2b; or SERCA3, preferably a human SERCA. The vector can be any vector suitable for gene transfer. For example, the vector can be an adeno viral vector, e.g., recombinant type 2 or type 5 adenoviral vector; an adeno-associated
virus, e.g., adeno-associated virus type 1, 2, 3, 4, 5 or 6, a lentiviral vector, or plasmid-based vector. The vector is preferably an adeno-associated virus-based vector or a lentivirus. Other vectors suitable for gene transfer, e.g., to cardiovascular tissue, are known in the art. In a preferred embodiment, the SERCA encoding nucleic acid is under the control of a heterologous regulatory region, e.g., a heterologous promoter. The promoter can be, e.g., a smooth muscle specific promoter, such as a smooth muscle alpha actin promoter, SM22a promoter; cardiac specific promoter, such as a cardiac myosin promoter (e.g., a cardiac myosin light chain 2v promoter), troponin T promoter, or BNP promoter. The promoter can also be, e.g., a viral promoter, such as CMV promoter. The promoter can be an inducible promoter, e.g., one regulatable by an exogenous agent, e.g., FK506, FK1012, a steroid, or tetracycline. The agent can be delivered by direct administration, e.g., injection (e.g., intra arterial, iv or im). In one embodiment, the agent is delivered directly to an affected vessel, e.g., artery. The agent can be coupled to a second agent, e.g., a delivery agent (e.g., an agent that protects the agent from degradation) or a targeting agent (e.g., for targeting to the vessel or targeting to the inside of a cell such as a smooth muscle cell, e.g., a liposome). In a preferred embodiment, the subject is a human, e.g., a male or female human. For example, the human can be between 20-40 years of age, 40-60 years of age, or 60-70 years of age, or greater than 70 years of age. In some embodiments, the subject is identified by evaluation of the subject's health history, conducting a physical examination, or by performing clinical testing. A preferred subject is one who has undergone or will undergo (e.g., within 1, 2, 3, 5, 10, 15, 30, or more, days) angioplasty, balloon angioplasty, insertion of a prosthesis, insertion of a graft, insertion of a stent, catheterization, or arterial blockage evaluation. In one embodiment, the restenosis occurs after angioplasty. h another embodiment, the restenosis occurs after vascular stent placement. The blood vessel is preferably a coronary artery, and can also be, for example, a peripheral artery or a cerebral artery. In a preferred embodiment, the method includes implanting a stent in an afflicted blood vessel of the subject, wherein the stent is coated with, or contains, the agent that increases SERCA activity, e.g., an agent described herein. In a preferred
embodiment, the method includes implanting in a blood vessel of the subject a stent coated with, or containing, SERCA2a or an expression vector that includes a SERCA2a encoding nucleic acid. In another embodiment, the agent is an agent that decreases phospholamban activity. An agent that inhibits phospholamban levels and/or activity can be one or more of: a phospholamban binding protein, e.g., a soluble phospholamban binding protein that binds and inhibits a phospholamban activity, e.g., SERCA2 binding activity; an antibody that specifically binds to the phospholamban protein, e.g., an antibody that disrupts phospholamban's ability to bind SERCA; a mutated inactive phospholamban or fragment thereof which, e.g., binds to a phospholamban binding partner (e.g., SERCA) but disrupts a phospholamban activity; a phospholamban nucleic acid molecule that can bind to a cellular phospholamban nucleic acid sequence, e.g., mRNA, and inhibit expression of the protein, e.g., an antisense molecule, phospholamban ribozyme or iRNA agent; an agent which decreases phospholamban gene expression, e.g., a small molecule which binds the promoter of phospholamban and decreases phospholamban gene expression. In another preferred embodiment, phospholamban is inhibited by decreasing the level of expression of an endogenous phospholamban gene, e.g., by decreasing transcription of the phospholamban gene. In a preferred embodiment, transcription of the phospholamban gene can be decreased by: altering the regulatory sequences of the endogenous phospholamban gene, e.g., by the addition of a negative regulatory sequence (such as a DNA-biding site for a transcriptional repressor), or by the removal of a positive regulatory sequence (such as an enhancer or a DNA-binding site for a transcriptional activator), activity, e.g., antisense nucleic acid at least partially complementary to a phospholamban DNA sequence, preferably a human phospholamban DNA sequence. In one embodiment, the method includes preconditioning the heart of the subject; and delivering the agent into a cardiovascular cell of the preconditioned heart, wherein the flow of blood through the heart is reduced during the delivery of the agent. In a preferred embodiment, the agent is a nucleic acid (e.g., a SERCA2a encoding nucleic acid) administered into a vessel of the preconditioned heart, wherein the flow of blood through the heart is reduced during the delivery of the agent. In a preferred embodiment, preconditioning is accomplished using a catheter, e.g., a
balloon catheter. "Preconditioning" refers to a naturally occurring protective mechanism by which a brief period of ischemia protects a tissue against adverse effects of a subsequent, prolonged period of ischemia. In the context of this method, "preconditioning" means inducing a state in which the heart is more resistant to damage from a second stoppage of flow. Preconditioning the heart muscle can be accomplished by a brief occlusion of a cardiac vessel (e.g., the left anterior descending artery) resulting in substantially increased expression of a gene subsequently transduced into the heart muscle. Preconditioning in the present method can be induced with a pharmacological agent, a mechanical manipulation, e.g., a catheter (e.g., a balloon catheter), or other surgical method. In a preferred embodiment, the method includes evaluating the subject for a cardiovascular parameter, e.g., lumen loss, heart rate, heart contractility, ventricular function, e.g., left ventricular end-diastolic pressure (LVEDP), left ventricular systolic pressure (LVSP), Ca2+ metabolism, e.g., intracellular Ca2+ concentration or peak or resting Ca2+, force generation, relaxation and pressure of the heart, a force frequency relationship, cardiocyte survival or apoptosis or ion channel activity, e.g., sodium calcium exchange, sodium channel activity, calcium channel activity, sodium potassium ATPase pump activity, activity of myosin heavy chain, troponin I, troponin C, troponin T, tropomyosin, actin, myosin light chain kinase, myosin light chain 1, myosin light chain 2 or myosin light chain 3, IGF-1 receptor, PI3 kinase, AKT kinase, sodium-calcium exchanger, calcium channel (L and T), calsequestrin or calreticulin. The evaluation can include performing angiography (e.g., quantitative angiography) and/or intravascular ultrasound (IVUS), e.g., before, after, or during the treatment. In a preferred embodiment, a pharmaceutical composition including one or more of the agents described herein is administered in a pharmaceutically effective dose. In a preferred embodiment, the administration of an agent which increases SERCA expression, levels or activity can be initiated: when the subject begins to show signs of restenosis, e.g., as evidenced by an decrease of more than 5, 10, 20, or 30% in lumen; when a coronary vascular condition is diagnosed; at the time a treatment for a coronary vascular condition is begun or begins to exert its effects (e.g.,
during surgery to implant a stent); or generally, as is needed to maintain heart function. The period over which the agent is administered (or the period over which clinically effective levels are maintained in the subject) can be long term, e.g., for six months or more or a year or more, or short term, e.g., for less than a year, six months, one month, two weeks or less. Although an agent can be administered in a short term, or once, expression of a nucleic acid in the agent can be sustained, e.g., for at least one, two, three, four, or six months. Promoters can be selected that are inducible, e.g., to limit or prolong the period of expression. In another aspect, the disclosure features a stent coated with, or containing an agent that can increase SERCA expression, e.g., an agent described herein. For example, the agent is a nucleic acid. The nucleic acid can be packaged in a viral or non-=viral particle. The stent can include, e.g., at least lxlO9, lxlO10, lxlO11, lxlO12, lxlO13, lxlO14, lxlO15, or lxlO16 units (e.g., particles), or, for example, between lxlO9 to lxlO18 or lxlO11 to lxlO16. In a preferred embodiment, the agent is a nucleic acid encoding SERCA, e.g.,
SERCA1, e.g., SERCAla or SERCAlb; SERCA2, e.g., SERCA2a or SERCA2b; or SERCA3. In a preferred embodiment, the SERCA encoding nucleic acid is under the control of a heterologous regulatory region, e.g., a heterologous promoter. The promoter can be, e.g., a smooth muscle specific promoter, such as a smooth muscle alpha actin promoter, SM22a promoter; cardiac specific promoter, such as a cardiac myosin promoter (e.g., a cardiac myosin light chain 2v promoter), troponin T promoter, or BNP promoter. The promoter can also be, e.g., a viral promoter, such as CMV promoter. In another embodiment, the agent is an antisense nucleic acid at least partially complementary to a phospholamban DNA sequence, preferably a human phospholamban DNA sequence. Although a stent described herein is preferably for use in a blood vessel, it can also be used in other tissues such as those forming a cavity, orifice or duct, in which restenosis can occur. Causes of such restenosis include, for example, organ transplantation.
In some embodiments, a stent described herein, in addition to being coated with, or containing, an agent that increases SERCA expression, can also be coated with a second therapeutic agent. For example, the stent can also contain one or more of: rapamycin, taxol and actinomycin-D. In another aspect, the disclosure features a kit. The kit includes: (a) an agent that increases SERCA, e.g., SERCA2a, activity (e.g., SERCA, a nucleic acid encoding SERCA, or an antisense nucleic acid at least partially complementary to a phospholamban nucleic acid), and (b) informational material relating to restenosis. Optionally, the kit includes a stent containing, or coated with, the agent. The informational material can include instructions for using the kit to prevent or treat restenosis. In another aspect, the disclosure features a stent that includes an antibody (e.g., a full length antibody or an antibody fragment, e.g., a Fab, Fc, scFv, etc). The antibody binds to a coat protein of a viral particle, e.g. a viral particle described herein. The stent can be used to deliver viral particles that contain any nucleic acid of interest, e.g., a therapeutic nucleic acid, e.g., a nucleic acid described herein. For example, the antibody can have an antigen binding site that interacts with a coat protein of an adenovirus, or an adeno-associated virus, or a lentivirus, e.g., a retrovirus. As used herein, a "stent" is a medical device configured for implantation in a body lumen to prevent or inhibit the closing of the lumen. A stent can be configured to be implanted in, e.g., a blood vessel such as an artery, or other body cavity, orifice or duct, such as a ureter. A stent is typically made of biocompatible metal or plastic. As used herein, a stent "coated with or containing" an agent means a stent having the agent either affixed to its surface or contained within it, so as to permit release of the agent from the stent and, hence, delivery of the agent to tissue in proximity with the stent. A stent can also include a slow-release formulation of the agent, e.g., to release the agent over time. An agent can be affixed by non-covalent interactions or by covalent interactions, e.g., covalent interactions that are disrupted overtime. Ability of an agent to function to a required degree can be to an extent detectable as significant by one skilled in the art or to a statistically significant degree.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a set of traces showing the ATP- and tBuBHQ-induced increase in cytosolic [Ca2+] in control conditions (top) or in cells infected with adenovirus SERCA2a vector (Ad S2a) (bottom). FIG. 2 is a set of graphs and micrographs showing the effects of SERCA2a on
VSMC. . SERCA 2a expression in growing VSMC blocked proliferation. (A) monitoring of adenoviral infection by GFP fluorescence (485/530 nm) in cultured VSMC (DO, day of infection; D4, day 4 after infection); (B) analysis of expression of SERCA2 by Western blot at D4 in Ad-infected and control VSMC; 40 μg of total protein extract were loaded on each line; (C) effect of infection by Ad-βGal and Ad- S2a on proliferation of VSMC; (D) double immunolabelling with a-SERCA2a (red) and a-PCNA (purple); GFP expression vas monitored by fluorescence 485/530nm. FIG. 3 illustrates the effect of SERCA2a expression on NFAT nuclear translocation in one implementation. (A) immunolabelling with a-NFAT: a - Ad bGal infected, b - control, c - Ad S2a infected, d - control + CsA (5μM, 24h), e - Ad S2a infected + Tg (lμM, lh), f -control +Tg (lμM, lh). (B) western blot analysis of cytosolic and nuclear extract prepared from control and Ad-infected SMC. Immnohybridisation with a-NFATcl. (C) analysis of NFAT-binding activities from control and Ad-infected SMC. EMSA experiments were performed with the P32- labelled NFAT probe. FIG. 4 provides a histogram showing the intima thickness under various conditions.
DETAILED DESCRIPTION The restenosis rates for the most common treatments for coronary vascular conditions are shown in Table 1. TABLE 1
Proliferation of vascular smooth muscle cells (VSMC) is thought to be a key factor in the development of atherosclerosis and restenosis after balloon injury and is associated with dedifferentiation of the VSMC. Alterations in expression of proteins involved in calcium homeostasis have been reported. Differentiated smooth muscle cell exhibits different Ca2+ signals including localized transient release through the ryanodine receptors in the form of Ca2+ sparks and Ca2+ waves of different amplitude and frequency. Proliferation of VSMC is accompanied by replacement of the L-type Ca2+ channels by the T-type, loss of ryanodine receptors and of SERCA2a, and enhanced capacitative Ca2+ entry. The inventors have found that increasing SERCA (e.g., SERCA2a) activity in a subject can prevent or reduce restenosis. The methods described herein, e.g., methods of preventing or reducing restenosis by increasing SERCA activity, e.g., by gene transfer of SERCA, can improve calcium handling without causing apoptosis. Other advantages of the methods and compositions described herein include: decreased proliferation of smooth muscle cells without causing apoptosis and cell death; lack of toxicity in other tissues; beneficial effects within the myocardium; prevention of smooth muscle death and maintenance of the integrity of the wall. Sarcoplamic reticulum (SR) Ca2+ ATPase (SERCA) The sarcoplasmic reticulum (SR) is an internal membrane system, which plays a critical role in the regulation of cytosolic Ca2+ concentrations and thus, excitation- contraction coupling in muscle. In cardiac cells release of Ca2+ from the SR leads to / contraction whereas in smooth muscle cells it induces vasorelaxation through activation of Ca2+ activated potassium channels and hyperpolarisation of the cell.
Control of the cytosolic Ca2+ concentration involves the active re-uptake of Ca2+ into the SR lumen by a Ca2+ -ATPase. In cardiac and smooth muscles, the SR Ca2+ - ATPase activity (SERCA2a) is under reversible regulation by phospholamban. Defects in SR Ca2+ cycling have a crucial role in progression of cardiac hypertrophy and failure. Cardiac hypertrophy as well as its deleterious effects on contractile function can be prevented by activating SR Ca2+ uptake either by
SERCA2a gene transfer or by decreasing the inhibitory effect of phospholamban on SERCA 2a (reviewed in Kaprielian et al., 2002, Basic Res Cardiol. 97 Suppl 1:1136- 45). The sequence of human SERCA proteins are known in the art (see, e.g., Lytton and MacLennan, 1988, J. Biol. Chem. 263(29), 15024-15031 ; Genbank Accession Nos. NP_001672; P16615; NP_733765).
Exemplary Gene Transfer The nucleic acids described herein, e.g., a SERCA encoding nucleic acid, can be incorporated into a gene construct to be used as a part of a gene therapy protocol. Methods for gene transfer in vivo are known in the art. Approaches include insertion of the subject gene in viral vectors including recombinant retro viruses, adenovirus (e.g., replication deficient, first generation, or gutted, second generation, adenovirus), adeno-associated virus (e.g., any of types 1-6), lentivirus, and herpes simplex virus-1, or recombinant bacterial or eukaryotic plasmids. Viral vectors transfect cells directly; plasmid DNA can be delivered with the help of, for example, cationic liposomes (lipofectin) or derivatized (e.g. antibody conjugated), polylysine conjugates, gramacidin S, artificial viral envelopes or other such intracellular carriers, as well as direct injection of the gene construct or CaPO4 precipitation carried out in vivo. Gene transfer into cardiovascular tissue, for example, has been successful using adenovirus (Ad) vectors with strong, non-tissue specific gene expression cassettes driven by cytomegalovirus (CMV) or Rous sarcoma virus (RSV) promoters. Clinical trials involving transduction of cardiac cells with viral vectors to deliver angiogenic factors such as vascular endothelial cell growth factor (VEGF), fibroblast growth factor (FGF) and hepatocyte growth factor (HGF) have been ongoing. Intra- aorta or intracoronary injection of virus has been used in vivo in animal models, h
one study, intracardiac injection of an Ad-SERCA2a viral vector in rats was sufficient to induce physiological improvement in calcium handling. See Miyamoto et al., 2000, Proc. Natl. Acad. Sci. USA 97:793-98. Adenoviral vectors have also been used in vivo to express β2 adrenergic receptor (β-AR) (see Maurice et al. 1999, J. Clin. Invest. 104:21-9 and Shah et al., 2001, Circulation 103:1311). As is known from studies on cystic fibrosis, transduction of all cells in a tissue is not required for improved function. For example, expression of the wild type sodium channel in as few as 6-10% of cells within an epithelial sheet lacking a functional sodium channel is sufficient for normal sodium ion transport (Johnson et al, 1992, Nat. Genet 2:21-5). This is known as the bystander effect. Tissue specific promoters have been used to increase specificity of myocardial gene expression (Rothmann et al., 1996, Gene Ther. 3:919-26). Another strategy to restrict expression of transferred genes to the heart has involved direct injection of a viral vector into the myocardium (Gutzman et al, 1993, Cric. Res. 73: 1202-7; French et al., 1994, Circulation. 90:2414-24). Another attempt involved intrapericardial virus vector injection combined with proteinase treatment (Fromes et al., 1999, Gene Ther. 6:683-8). These manipulations achieved local gene delivery, although with some drawbacks, due to a lack of intense viral vector diffusion. The efficiency of cardiomyocyte gene delivery by an adeno-associated virus (AAV) vector was documented in vitro using cultured rat neonatal cells, as well as in an ex vivo system using rat papillary muscle immersion (Maeda et al., 1998, J. Mol. Cell. Cardiol. 30:1341-8). Ex vivo AAV vector transfer followed by syngeneic heart transplantation was reported to achieve high efficiency marker gene expression (Svensson et al., 1999, Circulation. 99:201-5). Methods of achieving a high level of in vivo cardiotopic gene transfer with high consistency (average 60-70% of cardiac myocytes) are described, e.g., in US Published Application 20020032167. Other methods for the preparation and use of viral vectors are described in WO 96/13597, WO 96/33281, WO 97/15679, and Trapnell et al., 1994, Curr. Opin. Biotechnol. 5(6):617-625; Ardehali et al., 1995, J. Thorac. Cardiovasc. Surg. 109:716-720; Dalesandro et al, 1996, J. Thorac. Cardiovasc. Surg. 111 :416-422; Sawa et al., 1995, Circ 92, II479-11482; Lee et al.,
1996, J. Thorac. Cardiovasc. Surg. I ll, 246-252; Yap et al., 19996, Circ. 94, 1-53; and Pellegrini et al., 1998, Transpl. Int. 11, 373-377. A subject polynucleotide can also be administered using a non- viral delivery vehicle. "Non-viral delivery vehicle" (also referred to herein as "non-viral vector") as used herein is meant to include chemical formulations containing naked or condensed polynucleotides (e.g., a formulation of polynucleotides and cationic compounds (e.g., dextran sulfate)), and naked or condensed polynucleotides mixed with an adjuvant such as a viral particle (i.e., the polynucleotide of interest is not contained within the viral particle, but the transforming formulation is composed of both naked polynucleotides and viral particles (e.g., adenovirus particles) (see, e.g., Curiel et al. 1992 Am. J. Respir. Cell Mol. Biol. 6:247-52)). Thus "non-viral delivery vehicle" can include vectors composed of polynucleotides plus viral particles where the viral particles do not contain the polynucleotide of interest. "Non- iral delivery vehicles" include bacterial plasmids, viral genomes or portions thereof, wherein the polynucleotide to be delivered is not encapsidated or contained within a viral particle, and constructs comprising portions of viral genomes and portions of bacterial plasmids and/or bacteriophages. The term also encompasses natural and synthetic polymers and co-polymers. The term further encompasses lipid-based vehicles. Lipid- based vehicles include cationic liposomes such as disclosed by Feigner et al (U.S. Pat. Nos. 5,264,618 and 5,459,127; PNAS 84:7413-7417, 1987; Annals N.Y. Acad. Sci. 772: 126-139, 1995); they may also consist of neutral or negatively charged phospholipids or mixtures thereof including artificial viral envelopes as disclosed by Schreier et al. (U.S. Pat. Nos. 5,252,348 and 5,766,625). Non-viral delivery vehicles include polymer-based carriers. Polymer-based carriers may include natural and synthetic polymers and co-polymers. Preferably, the polymers are biodegradable, or can be readily eliminated from the subject. Naturally occurring polymers include polypeptides and polysaccharides. Synthetic polymers include, but are not limited to, polylysines, and polyethyleneimines (PEI; Boussif et al., PNAS 92:7297-7301, 1995) which molecules can also serve as condensing agents. These carriers may be dissolved, dispersed or suspended in a dispersion liquid such as water, ethanol, saline solutions and mixtures thereof. A wide variety of synthetic polymers are known in the art and can be used.
In clinical settings, the gene delivery systems for the therapeutic gene can be introduced into a patient by any of a number of methods, each of which is familiar in the art. For instance, a pharmaceutical preparation of the gene delivery system can be introduced systemically, e.g. by intravenous injection, and specific transduction of the protein in the target cells occurs predominantly from specificity of transfection provided by the gene delivery vehicle, cell-type or tissue-type expression due to the transcriptional regulatory sequences controlling expression of the receptor gene, or a combination thereof. In other embodiments, initial delivery of the recombinant gene is more limited with introduction into the animal being quite localized. For example, the gene delivery vehicle can be introduced by catheter (see U.S. Patent 5,328,470) or by stereotactic injection (e.g. Chen et al. (1994) PNAS 91 : 3054-3057). The pharmaceutical preparation of the gene therapy construct can consist essentially of the gene delivery system in an acceptable diluent, or can comprise a slow release matrix in which the gene delivery vehicle is imbedded. Alternatively, where the complete gene delivery system can be produced in tact from recombinant cells, e.g. retroviral vectors, the pharmaceutical preparation can comprise one or more cells which produce the gene delivery system. The polynucleotide to be delivered can also be formulated as a DNA- or RNA- liposome complex formulation. Such complexes comprise a mixture of lipids which bind to genetic material (DNA or RNA) by means of cationic charge (electrostatic interaction). Cationic Hposomes which may be used in the present invention include 3β-[N-(N', N'-dimethyl-aminoethane)- -carbamoyl] -cholesterol (DC-Choi), 1,2- bis(oleoyloxy-3-trimethylammonio-pr- opane (DOTAP) (see, for example, WO 98/07408), lysinylphosphatidylethanola- mine (L-PE), lipopolyamines such as lipospermine, N-(2-hydroxyethyl)-N,N-d- imethyl-2,3-bis(dodecyloxy)-l- propanaminium bromide, dimethyl dioctadecyl ammonium bromide (DDAB), dioleoylphosphatidyl ethanolamine (DOPE), dioleoylphosphatidyl choline (DOPC), N(l,2,3-dioleyloxy) proρyl-N,N,N-triethylammonium (DOTMA), DOSPA, DMRIE, GL-67, GL-89, Lipofectin, and Lipofectamine (Thiery et al. (1997) Gene Ther. 4:226- 237; Feigner et al., Annals N.Y. Acad. Sci. 772:126-139, 1995; Eastman et al., Hum. Gene Ther. 8:765-7.73, 1997). Polynucleotide/lipid formulations described in U.S. Pat. No. 5,858,784 can also be used in the methods described herein. Many of these
lipids are commercially available from, for example, Boehringer-Mannheim, and Avanti Polar Lipids (Birmingham, Ala.). Also encompassed are the cationic phospholipids found in U.S. Pat. Nos. 5,264,618, 5,223,263 and 5,459,127. Other suitable phospholipids which may be used include phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine, sphingomyelin, phosphatidylinositol, and the like. Cholesterol may also be included.
Exemplary Methods of Treatment The present invention includes within its scope the use of a composition for treating restenosis, comprising an agent that increases SERCA, e.g., SERCA2a, activity. The agent can be, e.g., a nucleic acid encoding SERCA in the form of expression vector containing a DNA encoding SERCA2, preferably SERCA2a, in association with a pharmaceutically acceptable carrier, excipient or other additive, if necessary. In another embodiment, the agent is an antisense nucleic acid at least partially complementary to a phospholamban nucleic acid sequence in association with a pharmaceutically acceptable carrier, excipient or other additive, if necessary. Examples of suitable carriers, excipients, and diluents are lactose, dextrose, sucrose, sorbitol, mannitol, starches, gum acacia, alginates, gelatin, calcium phosphate, calcium silicate, cellulose, methyl cellulose, microcrystalline cellulose, polyvinylpyrrolidone, water, methylhydroxybenzoates, propylhydroxybenzoates, talc, magnesium stearate and mineral oil. The compositions may additionally include lubricating agents, wetting agents, flavoring agents, emulsifiers, preservatives and the like. The compositions described herein can be formulated so as to provide quick, sustained or delayed release of the active ingredient after administration to a patient by employing any of the procedures well known in the art. In a preferred embodiment, the agent is formulated for intracardiac or intra vessel administration. Such direct administration can be accomplished thorough, e.g., coating the agent on a stent to be implanted into a vessel of the subject. The effective amount of a nucleic DNA encoding SERCA2a as an active ingredient may range from about 0.05 to 500 mg/kg, preferably 0.5 to 50 mg/kg body weight, and can be administered in a single dose or in divided doses. However, it should be understood
that the amount of the active ingredient actually administered ought to be determined in light of various relevant factors including the condition to be treated, the age and weight of the individual patient, and the severity of the patient's symptom; and, therefore, the above dose should not be intended to limit the scope of the invention in any way.
Exemplary Stents The invention also includes a stent coated with, or containing, an agent that increase SERCA, preferably SERCA2a, activity, e.g., an agent described herein. Methods for preparing stents (both biodegradable and non-biodegradable) for delivering a therapeutic agent are well known (see, e.g., U.S. Pat. Nos. 5,163,952, 5,304,121, 6,391,052, 6,387,124, 6,379,382, and 6,358,556, 6,605,110, 6,605,114, , 6,572,645, 6,569,194, 6,545,748, 6,541,116, 6,527,801, 6,506,437). In one embodiment, a stent described herein is coated with a therapeutic agent, e.g., an agent described herein, such as a SERCA nucleic acid described herein, using techniques known in the art. In one embodiment, the stent is a stainless steel stent or nytinol mesh like devices. For example, a stent can be delivered into the coronary artery on a catheter during a PCI procedure (percutaneous coronary intervention). A stent can be deployed in the artery by either expansion by a balloon or by a self expanding delivery design. Exemplary commercially available stents include Gianturco-Roubin Stents (e.g., from Cook Cardiology), Multilink, Duet, Tetra, Penta, Zeta Stents(e.g., from Guidant); Nir, Wall Stents, Taxus (e.g., from SCJJVLED/Boston Scientific), GFX/S series Stents (e.g., from Medtronic/ AVE), velocity and Cypher stents (e.g., from Johnson & Johnson/Cordis) For example, a stent can be coated with a polymeric cation that can mediate nucleic acid condensation or compaction, e.g., as described in U.S. 6,596,699. Linear polycations such as poly-L-lysine, polyornithine, polyarginine and the like can be used. The polymers may be homopolymers, such as polylysine, polyornithine, or polyarginine, or may be heteropolymers, including random polymers formed of lysine, ornithine, arginine and the like. More complex molecules may also be employed as polycations, such as branched or linear polyethylenimine and the like.
Any of a variety of naturally occurring nucleic acid binding agents may be employed, such as spermine or spermidine, and are including within the definition of polycation. Protamine can similarly be employed, as can any of a variety of histones. Polyamidoamine dendrimers may similarly be employed, wherein terminal amino groups bind the nucleic acid by electrostatic means, resulting in positively charged condensates. The polycation may be specifically modified to provide optimal characteristics to form the desired condensate. For example, a repeating lysine chain of 18 residues followed by a tryptophan and an alkylated cysteine residue has been reported to form condensates with properties at least equal to polylysine. McKenzie et al., J. Peptide Res. 54:311-318 (1999). In general, the polycation is positively charged, and has a net positive charge at about pH 6 to about 8 or has more than about five positively charged residues. The polycation has a higher number of positive charges compared to the number of negative charges. A polycation includes natural nucleic acid-binding proteins and recombinant nucleic acid-binding protein, such as homo- or hetero-polymers of amino acids or synthetic compounds that bind to one or more nucleic acid sequences found within natural or recombinant nucleic acid molecules and results in nucleic acid condensation. An additional method of coating a therapeutic nucleic acid onto a medical device such as a stent involves coating the medical device with a swellable hydrogel polymer as described, e.g., in U.S. 5,674,192 or 6,409,716. The hydrogel coating is characterized by the ability to incorporate a substantial amount of the nucleic acid,, typically in aqueous solution form, and is swellable such that the aqueous solution can be effectively squeezed out of the coating when pressure is applied, e.g., by inflation or expansion of the stent. Administration of the drug in this way enables the drug to be site-specific, such that release of high concentrations can be limited to direct application to the affected tissue. Other methods of coupling a therapeutic agent, such nucleic acid, to a stent or other medical device are known in the art, see for example, U.S. 6,024,918, U.S. 6,506,408; U.S. 5,932,299. In some embodiments, a stent described herein, in addition to being coated with, or containing, an agent that increases SERCA expression, can also be coated with a second therapeutic agent. For example, the stent can also contain one or more
of: rapamycin, taxol and actinomycin-D, a thrombin inhibitor, an antithrombogenic agent, a thrombolytic agent, a fibrinolytic agent, a vasospasm inhibitor, a calcium channel blocker, a vasodilator, an antihypertensive agent, an antimicrobial agent, an antibiotic, an inhibitor of surface glycoprotein receptors, an antiplatelet agent, an antimitotic, a microtubule inhibitor, an antisecretory agent, an actin inhibitor, a remodeling inhibitor, an antisense nucleotide, an antimetabohte, an antiprohferative, an anticancer chemotherapeutic agent, an anti-inflammatory steroid or non-steroidal antiinflammatory agent, an immunosuppressive agent, a growth hormone antagonist, a growth factor, a dopamine agonist, a radiotherapeutic agent, a peptide, a protein, an enzyme, an extracellular matrix component, a free radical scavenger, a chelator, an antioxidant, an antipolymerase, an antiviral agent, a photodynamic therapy agent, and a gene therapy agent, e.g., a second gene therapy agent. In one embodiment, the subject is also administered a second agent, e.g., separately from the agent that increases SERCA activity. For example, the subject can be orally administered aspirin or an oral anti-platelet drug (e.g., PLAVIX® or TICLLD®).
Exemplary Kits The agent described herein (e.g., SERCA nucleic acid or polypeptide) can be provided in a kit. The kit includes (a) the agent, e.g., a composition that includes the agent, (b) informational material, and optionally (c) a stent. The informational material can be descriptive, instructional, marketing or other material that relates to the methods described herein and/or the use of the agent for the methods described herein. For example, the informational material relates to restenosis. In one embodiment, the informational material can include instructions to administer the agent in a suitable manner to perform the methods described herein, e.g., in a suitable dose, dosage form, or mode of administration (e.g., a dose, dosage form, or mode of administration described herein). In another embodiment, the informational material can include instructions to administer the agent to a suitable subject, e.g., a human, e.g., a human having, or at risk for, restenosis. For example, the material can include instructions to administer the agent to a subject who has had, is having or will have angioplasty.
The informational material of the kits is not limited in its form. In many cases, the informational material, e.g., instructions, is provided in printed matter, e.g., a printed text, drawing, and/or photograph, e.g., a label or printed sheet. However, the informational material can also be provided in other formats, such as computer readable material, video recording, or audio recording. In another embodiment, the informational material of the kit is contact information, e.g., a physical address, email address, website, or telephone number, where a user of the kit can obtain substantive information about the agent and/or its use in the methods described herein. Of course, the informational material can also be provided in any combination of formats. In addition to the agent, the composition of the kit can include other ingredients, such as a solvent or buffer, a stabilizer, a preservative, and/or a second agent for treating a condition or disorder described herein. Alternatively, the other ingredients can be included in the kit, but in different compositions or containers than the agent. In such embodiments, the kit can include instructions for admixing the agent and the other ingredients, or for using the agent together with the other ingredients. The agent can be provided in any form, e.g., liquid, dried or lyophilized form. It is preferred that the agent be substantially pure and/or sterile. When the agent is provided in a liquid solution, the liquid solution preferably is an aqueous solution, with a sterile aqueous solution being preferred. When the agent is provided as a dried form, reconstitution generally is by the addition of a suitable solvent. The solvent, e.g., sterile water or buffer, can optionally be provided in the kit. The kit can include one or more containers for the composition containing the agent. In some embodiments, the kit contains separate containers, dividers or compartments for the composition and informational material. For example, the composition can be contained in a bottle, vial, or syringe, and the informational material can be contained in a plastic sleeve or packet. In other embodiments, the separate elements of the kit are contained within a single, undivided container. For example, the composition is contained in a bottle, vial or syringe that has attached thereto the informational material in the form of a label. In some embodiments, the kit includes a plurality (e.g., a pack) of individual containers, each containing one or more unit dosage forms (e.g., a dosage form described herein) of the agent. For
example, the kit includes a plurality of syringes, ampules, foil packets, or blister packs, each containing a single unit dose of the agent. The containers of the kits can be air tight and/or waterproof. The kit optionally includes a device suitable for administration of the composition, e.g., a stent, syringe, or any useful delivery device. In a preferred embodiment, the device is a stent.
Generation of Variants: Production of Altered DNA and Peptide Sequences by Random Methods Amino acid sequence variants of SERCA or fragments thereof can be prepared by a number of techniques, such as random mutagenesis of DNA which encodes a
SERCA or a region thereof. Useful methods also include PCR mutagenesis and saturation mutagenesis. A library of random amino acid sequence variants can also be generated by the synthesis of a set of degenerate oligonucleotide sequences. PCR Mutagenesis h PCR mutagenesis, reduced Taq polymerase fidelity is used to introduce random mutations into a cloned fragment of DNA (Leung et al., 1989, Technique 1:11-15). This is a very powerful and relatively rapid method of introducing random mutations. The DNA region to be mutagenized is amplified using the polymerase chain reaction (PCR) under conditions that reduce the fidelity of DNA synthesis by Taq DNA polymerase, e.g., by using a dGTP/dATP ratio of five and adding Mn2+ to the PCR reaction. The pool of amplified DNA fragments are inserted into appropriate cloning vectors to provide random mutant libraries. Saturation Mutagenesis Saturation mutagenesis allows for the rapid introduction of a large number of single base substitutions into cloned DNA fragments (Mayers et al., 1985, Science 229:242). This technique includes generation of mutations, e.g., by chemical treatment or irradiation of single-stranded DNA in vitro, and synthesis of a complimentary DNA strand. The mutation frequency can be modulated by modulating the severity of the treatment, and essentially all possible base substitutions can be obtained. Because this procedure does not involve a genetic selection for
mutant fragments both neutral substitutions, as well as those that alter function, are obtained. The distribution of point mutations is not biased toward conserved sequence elements.
Degenerate Oligonucleotides A library of homologs can also be generated from a set of degenerate oligonucleotide sequences. Chemical synthesis of a degenerate sequences can be carried out in an automatic DNA synthesizer, and the synthetic genes then ligated into an appropriate expression vector. The synthesis of degenerate oligonucleotides is known in the art (see for example, Narang, SA (1983) Tetrahedron 39:3; Itakura et al. (1981) Recombinant DNA, Proc 3rd Cleveland Sympos. Macromolecules, ed. AG Walton, Amsterdam: Elsevier pp273-289; Itakura et al. (1984) Annu. Rev. Biochem. 53:323; Itakura et al. (1984) Science 198:1056; Ike et al. (1983) Nucleic Acid Res. 11 :477. Such techniques have been employed in the directed evolution of other proteins (see, for example, Scott et al. (1990) Science 249:386-390; Roberts et al. (1992) PNAS 89:2429-2433; Devlin et al. (1990) Science 249: 404-406; Cwiria et al. (1990) PNAS 87: 6378-6382; as well as U.S. Patents Nos. 5,223,409, 5,198,346, and 5,096,815).
Generation of Variants: Production of Altered DNA and Peptide Sequences by Directed Mutagenesis
Non-random or directed mutagenesis techniques can be used to provide specific sequences or mutations in specific regions. These techniques can be used to create variants that include, e.g., deletions, insertions, or substitutions, of residues of the known amino acid sequence of a protein. The sites for mutation can be modified individually or in series, e.g., by (1) substituting first with conserved amino acids and then with more radical choices depending upon results achieved, (2) deleting the target residue, or (3) inserting residues of the same or a different class adjacent to the located site, or combinations of options 1-3.
Alanine Scanning Mutagenesis
Alanine scanning mutagenesis is a useful method for identification of certain residues or regions of the desired protein that are preferred locations or domains for mutagenesis, Cunningham and Wells (Science 244:1081-1085, 1989). In alanine scanning, a residue or group of target residues are identified (e.g., charged residues such as Arg, Asp, His, Lys, and Glu) and replaced by a neutral or negatively charged amino acid (most preferably alanine or polyalanine). Replacement of an amino acid can affect the interaction of the amino acids with the surrounding aqueous environment in or outside the cell. Those domains demonstrating functional sensitivity to the substitutions are then refined by introducing further or other variants at or for the sites of substitution. Thus, while the site for introducing an amino acid sequence variation is predetermined, the nature of the mutation per se need not be predetermined. For example, to optimize the performance of a mutation at a given site, alanine scanning or random mutagenesis may be conducted at the target codon or region and the expressed desired protein subunit variants are screened for the optimal combination of desired activity.
Oligonucleotide-Mediated Mutagenesis Oligonucleotide-mediated mutagenesis is a useful method for preparing substitution, deletion, and insertion variants of DNA, see, e.g., Adelman et al., (DNA
2:183, 1983). Briefly, the desired DNA is altered by hybridizing an oligonucleotide encoding a mutation to a DNA template, where the template is the single-stranded form of a plasmid or bacteriophage containing the unaltered or native DNA sequence of the desired protein. After hybridization, a DNA polymerase is used to synthesize an entire second complementary strand of the template that will thus incorporate the oligonucleotide primer, and will code for the selected alteration in the desired protein DNA. Generally, oligonucleotides of at least 25 nucleotides in length are used. An optimal oligonucleotide will have 12 to 15 nucleotides that are completely complementary to the template on either side of the nucleotide(s) coding for the mutation. This ensures that the oligonucleotide will hybridize properly to the single- stranded DNA template molecule. The oligonucleotides are readily synthesized using techniques known in the art such as that described by Crea et al. (Proc. Natl. Acad. Sci. (1978) USA, 75: 5765).
Cassette Mutagenesis Another method for preparing variants, cassette mutagenesis, is based on the technique described by Wells et al. (Gene, 34:315[1985J). The starting material is a plasmid (or other vector) which includes the protein subunit DNA to be mutated. The codon(s) in the protein subunit DNA to be mutated are identified. There must be a unique restriction endonuclease site on each side of the identified mutation site(s). If no such restriction sites exist, they may be generated using the above-described oligonucleotide-mediated mutagenesis method to introduce them at appropriate locations in the desired protein subunit DNA. After the restriction sites have been introduced into the plasmid, the plasmid is cut at these sites to linearize it. A double- stranded oligonucleotide encoding the sequence of the DNA between the restriction sites but containing the desired mutation(s) is synthesized using standard procedures. The two strands are synthesized separately and then hybridized together using standard techniques. This double-stranded oligonucleotide is referred to as the cassette. This cassette is designed to have 3' and 5' ends that are comparable with the ends of the linearized plasmid, such that it can be directly ligated to the plasmid. This plasmid now contains the mutated desired protein subunit DNA sequence.
Combinatorial Mutagenesis Combinatorial mutagenesis can also be used to generate variants. For example, the amino acid sequences for a group of homologs or other related proteins are aligned, preferably to promote the highest homology possible. All of the amino acids which appear at a given position of the aligned sequences can be selected to create a degenerate set of combinatorial sequences. The variegated library of variants is generated by combinatorial mutagenesis at the nucleic acid level, and is encoded by a variegated gene library. For example, a mixture of synthetic oligonucleotides can be enzymatically ligated into gene sequences such that the degenerate set of potential sequences are expressible as individual peptides, or alternatively, as a set of larger fusion proteins containing the set of degenerate sequences.
Primary High-Through-Put Methods for Screening Libraries of Peptide Fragments or Homologs Various techniques are known in the art for screening peptides, e.g., synthetic peptides, e.g., small molecular weight peptides (e.g., linear or cyclic peptides) or generated mutant gene products. Techniques for screening large gene libraries often include cloning the gene library into replicable expression vectors, transforming appropriate cells with the resulting library of vectors, and expressing the genes under conditions in which detection of a desired activity, assembly into a trimeric molecules, binding to natural ligands, e.g., a receptor or substrates, facilitates relatively easy isolation of the vector encoding the gene whose product was detected. Each of the techniques described below is amenable to high through-put analysis for screening large numbers of sequences created, e.g., by random mutagenesis techniques.
Two Hybrid Systems Two hybrid (interaction trap) assays can be used to identify a protein that interacts with SERCA. These may include, e.g., agonists, superagonists, and antagonists of SERCA. (The subject protein and a protein it interacts with are used as the bait protein and fish proteins.). These assays rely on detecting the reconstitution of a functional transcriptional activator mediated by protein-protein interactions with a bait protein. In particular, these assays make use of chimeric genes which express hybrid proteins. The first hybrid comprises a DNA-binding domain fused to the bait protein, e.g., SERCA or active fragments thereof. The second hybrid protein contains a transcriptional activation domain fused to a "fish" protein, e.g. an expression library. If the fish and bait proteins are able to interact, they bring into close proximity the DNA-binding and transcriptional activator domains. This proximity is sufficient to cause transcription of a reporter gene which is operably linked to a transcriptional regulatory site which is recognized by the DNA binding domain, and expression of the marker gene can be detected and used to score for the interaction of the bait protein with another protein.
Display Libraries In one approach to screening assays, the candidate peptides are displayed on the surface of a cell or viral particle, and the ability of particular cells or viral particles to bind an appropriate receptor protein via the displayed product is detected in a "panning assay". For example, the gene library can be cloned into the gene for a surface membrane protein of a bacterial cell, and the resulting fusion protein detected by panning (Ladner et al., WO 88/06630; Fuchs et al. (1991) Bio/Technology 9:1370- 1371; and Goward et al. (1992) TIBS 18:136-140). This technique was used in Sahu et al. (1996) J. Immunology 157:884-891, to isolate a complement inhibitor. In a similar fashion, a detectably labeled ligand can be used to score for potentially functional peptide homologs. Fluorescently labeled ligands, e.g., receptors, can be used to detect homolog which retain ligand-binding activity. The use of fluorescently labeled ligands, allows cells to be visually inspected and separated under a fluorescence microscope, or, where the morphology of the cell permits, to be separated by a fluorescence-activated cell sorter. A gene library can be expressed as a fusion protein on the surface of a viral particle. For instance, in the filamentous phage system, foreign peptide sequences can be expressed on the surface of infectious phage, thereby conferring two significant benefits. First, since these phage can be applied to affinity matrices at concentrations well over 10 χ3 phage per milliliter, a large number of phage can be screened at one time. Second, since each infectious phage displays a gene product on its surface, if a particular phage is recovered from an affinity matrix in low yield, the phage can be amplified by another round of infection. The group of almost identical E. coli filamentous phages Ml 3, fd., and fl are most often used in phage display libraries. Either of the phage gill or gVIII coat proteins can be used to generate fusion proteins without disrupting the ultimate packaging of the viral particle. Foreign epitopes can be expressed at the NH2-terminal end of pill and phage bearing such epitopes recovered from a large excess of phage lacking this epitope (Ladner et al. PCT publication WO 90/02909; Garrard et al, PCT publication WO 92/09690; Marks et al. (1992) J Biol. Chem. 267:16007-16010; Griffiths et al. (1993) EMBOJ 12:725-734; Clackson et al. (1991) Nature 352:624-628; and Barbas et al. (1992) PNAS 89:4457- 4461).
A common approach uses the maltose receptor of E. coli (the outer membrane protein, LamB) as a peptide fusion partner (Charbit et al. (1986) EMBO 5, 3029- 3037). Oligonucleotides have been inserted into plasmids encoding the LamB gene to produce peptides fused into one of the extracellular loops of the protein. These peptides are available for binding to ligands, e.g., to antibodies, and can elicit an immune response when the cells are administered to animals. Other cell surface proteins, e.g., OmpA (Schorr et al. (1991) Vaccines 91, pp. 387-392), PhoΕ (Agterberg, et al. (1990) Gene 88, 37-45), and PAL (Fuchs et al. (1991) Bio/Tech 9, 1369-1372), as well as' large bacterial surface structures have served as vehicles for peptide display. Peptides can be fused to pilin, a protein which polymerizes to form the pilus-a conduit for interbacterial exchange of genetic information (Thiry et al.
(1989) Appl. Environ. Microbiol. 55, 984-993). Because of its role in interacting with other cells, the pilus provides a useful support for the presentation of peptides to the extracellular environment. Another large surface structure used for peptide display is the bacterial motive organ, the flagellum. Fusion of peptides to the subunit protein flagellin offers a dense array of may peptides copies on the host cells (Kuwajima et al. (1988) Bio/Tech. 6, 1080-1083). Surface proteins of other bacterial species have also served as peptide fusion partners. Examples include the Staphylococcus protein A and the outer membrane protease IgA of eisseria (Hansson et al. (1992) J. Bacteriol. 11 A, 4239-4245 and Klauser et al. (1990) EMBO J. 9, 1991-1999). In the filamentous phage systems and the LamB system described above, the physical link between the peptide and its encoding DNA occurs by the containment of the DNA within a particle (cell or phage) that carries the peptide on its surface. Capturing the peptide captures the particle and the DNA within. An alternative scheme uses the DNA-binding protein Lad to form a link between peptide and DNA (Cull et al. (1992) PNAS USA 89:1865-1869). This system uses aplasmid containing the Lad gene with an oligonucleotide cloning site at its 3 '-end. Under the controlled induction by arabinose, a Lacl-peptide fusion protein is produced. This fusion retains the natural ability of Lad to bind to a short DNA sequence known as LacO operator (LacO). By installing two copies of LacO on the expression plasmid, the Lacl- peptide fusion binds tightly to the plasmid that encoded it. Because the plasmids in each cell contain only a single oligonucleotide sequence and each cell expresses only
a single peptide sequence, the peptides become specifically and stably associated with the DNA sequence that directed its synthesis. The cells of the library are gently lysed and the peptide-DNA complexes are exposed to a matrix of immobilized receptor to recover the complexes containing active peptides. The associated plasmid DNA is then reintroduced into cells for amplification and DNA sequencing to determine the identity of the peptide ligands. As a demonstration of the practical utility of the method, a large random library of dodecapeptides was made and selected on a monoclonal antibody raised against the opioid peptide dynorphin B. A cohort of peptides was recovered, all related by a consensus sequence corresponding to a six- residue portion of dynorphin B. (Cull et al. (1992) Proc. Natl. Acad. Sci. U.S.A. 89- 1869) This scheme, sometimes referred to as peptides-on-plasmids, differs in two important ways from the phage display methods. First, the peptides are attached to the C-terminus of the fusion protein, resulting in the display of the library members as peptides having free carboxy termini. Both of the filamentous phage coat proteins, pill and pVIII, are anchored to the phage through their C-termini, and the guest peptides are placed into the outward-extending N-terminal domains. In some designs, the phage-displayed peptides are presented right at the amino terminus of the fusion protein. (Cwiria, et al. (1990) Proc. Natl. Acad. Sci. U.S.A. 87, 6378-6382) A second difference is the set of biological biases affecting the population of peptides actually present in the libraries. The Lad fusion molecules are confined to the cytoplasm of the host cells. The phage coat fusions are exposed briefly to the cytoplasm during translation but are rapidly secreted through the inner membrane into the periplasmic compartment, remaining anchored in the membrane by their C-terminal hydrophobic domains, with the N-termini, containing the peptides, protruding into the periplasm while awaiting assembly into phage particles. The peptides in the Lad and phage libraries may differ significantly as a result of their exposure to different proteolytic activities. The phage coat proteins require transport across the inner membrane and signal peptidase processing as a prelude to incorporation into phage. Certain peptides exert a deleterious effect on these processes and are underrepresented in the libraries (Gallop et al. (1994) J. Med. Chem. 37(9):1233-1251). These particular biases are not a factor in the Lacl display system.
The number of small peptides available in recombinant random libraries is enormous. Libraries of 107-109 independent clones are routinely prepared. Libraries as large as 1011 recombinants have been created, but this size approaches the practical limit for clone libraries. This limitation in library size occurs at the step of transforming the DNA containing randomized segments into the host bacterial cells. To circumvent this limitation, an in vitro system based on the display of nascent peptides in polysome complexes has recently been developed. This display library method has the potential of producing libraries 3-6 orders of magnitude larger than the currently available phage/phagemid or plasmid libraries. Furthermore, the construction of the libraries, expression of the peptides, and screening, is done in an entirely cell-free format. In one application of this method (Gallop et al. (1994) J. Med. Chem. 37(9):1233-1251), a molecular DNA library encoding 1012 decapeptides was constructed and the library expressed in an E. coli S30 in vitro coupled transcription/translation system. Conditions were chosen to stall the ribosomes on the mRNA, causing the accumulation of a substantial proportion of the RNA in polysomes and yielding complexes containing nascent peptides still linked to their encoding RNA. The polysomes are sufficiently robust to be affinity purified on immobilized receptors in much the same way as the more conventional recombinant peptide display libraries are screened. RNA from the bound complexes is recovered, converted to cDNA, and amplified by PCR to produce a template for the next round of synthesis and screening. The polysome display method can be coupled to the phage display system. Following several rounds of screening, cDNA from the enriched pool of polysomes was cloned into a phagemid vector. This vector serves as both a peptide expression vector, displaying peptides fused to the coat proteins, and as a DNA sequencing vector for peptide identification. By expressing the polysome- derived peptides on phage, one can either continue the affinity selection procedure in this format or assay the peptides on individual clones for binding activity in a phage ΕLISA, or for binding specificity in a completion phage ΕLISA (Barret, et al. (1992) Anal. Biochem 204,357-364). To identify the sequences of the active peptides one sequences the DNA produced by the phagemid host.
For example, one or more residues (e.g., between one and six residues or one and three residues) in a SERCA protein can differ from wild-type or can be deleted. For example, the N-terminal first and/or second residue (e.g., after removal of a signal sequence) can be deleted, and the C-terminal-most first and/or second residue can be deleted. Selected transmembrane residues can be altered, e.g., with similar hydrophobic residues. The protein may include other substitutions, e.g., conservative substitutions. A "conservative amino acid substitution" is one in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art. These families include amino acids with basic side chains (e.g., lysine, arginine, histidine), acidic side chains (e.g., aspartic acid, glutamic acid), uncharged polar side chains (e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine), nonpolar side chains (e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan), beta-branched side chains (e.g., threonine, valine, isoleucine) and aromatic side chains (e.g., tyrosine, phenylalanine, tryptophan, histidine). It is possible for many framework and CDR amino acid residues to include one or more conservative substitutions.
Secondary Screens for Inhibitors of the Alternative Pathway The high through-put assays described above can be followed (or substituted) by secondary screens, e.g., the following screens, in order to identify biological activities which will, e.g., allow one skilled in the art to differentiate agonists from antagonists. The type of a secondary screen used will depend on the desired activity that needs to be tested. Several such assays are described below. For example, an assay can be developed in which the ability to increase or mimic SERCA activity can be used to identify SERCA agonists from a group of peptide fragments isolated though one of the primary screens described above.
Binding Assays SERCA can bind to a SERCA binding partner, e.g., phospholamban or sarcolipin. The ability of a SERCA variant to bind a binding partner, e.g., phospholamban or sarcolipin, is an assayable activity of SERCA function. In
addition, a binding assay, e.g., a binding assay described herein, can be used to evaluate: (a) the ability of a test agent to bind SERCA; (b) the ability of a test agent to inhibit binding of SERCA to a binding partner, e.g., the ability of a test agent to inhibit or disrupt SERCA binding to phospholamban or sarcolipin; the ability of a test agent to stabilize or increase binding of a complement component to a binding partner, e.g., the ability of a test agent to stabilize or increase SERCA binding to phospholamban or sarcolipin. As SERCA, e.g., human SERCA, has been cloned and produced recombinantly, it is readily available as a reagent to be used in standard binding assays known in the art, which include, but are not limited to: affinity chromatography, size exclusion chromatography, gel filtration, fluid phase binding assay; ELISA (e.g., competition ELISA), immunoprecipitation.
Peptide Mimetics The invention also provides for production of domains of SERCA, to generate mimetics, e.g. peptide or non-peptide agents, e.g., agonists. Non-hydrolyzable peptide analogs of critical residues can be generated using benzodiazepine (e.g., see Freidinger et al. in Peptides: Chemistry and Biology, G.R. Marshall ed., ESCOM Publisher: Leiden, Netherlands, 1988), azepine (e.g., see Huffman et al. in Peptides: Chemistry and Biology, G.R. Marshall ed., ESCOM Publisher: Leiden, Netherlands, 1988), substituted gama lactam rings (Garvey et al. in Peptides: Chemistry and Biology, G.R. Marshall ed., ESCOM Publisher: Leiden, Netherlands, 1988), keto-methylene pseudopeptides (Ewenson et al. (1986) J Med Chem 29:295; and Ewenson et al. in Peptides: Structure and Function (Proceedings of the 9th American Peptide Symposium) Pierce Chemical Co. Rockland, IL, 1985), b- turn dipeptide cores (Nagai et al. (1985) Tetrahedron Lett 26:647; and Sato et al.
(1986) J Chem Soc Perkin Trans 1:1231), and b-aminoalcohols (Gordon et al. (1985) Biochem Biophys Res Communl26:419; and Dann et al. (1986) Biochem Biophys Res Commun 134:71).
Exemplary Modes of Administration An agent that modulates SERCA signaling, e.g., an agent described herein, can be administered to a subject by standard methods. For example, the agent can be administered by any of a number of different routes including by introduction into a lumen of the circulatory system, e.g., the lumen of an artery, vein, or organ, e.g., the heart. In another embodiment, the agent is administered by injection, e.g., intra- arterially, intramuscularly, or intravenously. The agent can be packaged in a viral particle, and formulated with materials compatible with maintaining ability of the viral particle to introduce the nucleic acid into a cell, e.g., when the viral particle is introduced into a subject. The agent, e.g., a SERCA nucleic acid molecule, polypeptide, fragments or analog, modulators (e.g., organic compounds and antibodies (also referred to herein as "active compounds") can be incorporated into pharmaceutical compositions suitable for administration to a subject, e.g., a human. Such compositions typically include the polypeptide, nucleic acid molecule, modulator, or antibody and a pharmaceutically acceptable carrier. As used herein the language "pharmaceutically acceptable carrier" is intended to include any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like, compatible with pharmaceutical administration. The use of such media and agents for pharmaceutically active substances are known. Except insofar as any conventional media or agent is incompatible with the active compound, such media can be used in the compositions of the invention. Supplementary active compounds can also be incorporated into the compositions. A pharmaceutical composition can be formulated to be compatible with its intended route of administration. Solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. pH can be adjusted with acids or bases, such as
hydrochloric acid or sodium hydroxide. The parenteral preparation can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic. Pharmaceutical compositions suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion. For intravenous administration, suitable carriers include physiological saline, bacteriostatic water, Cremophor EL™ (BASF, Parsippany, NJ) or phosphate buffered saline (PBS). In all cases, the composition must be sterile and should be fluid to the extent that easy syringability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi. The carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), and suitable mixtures thereof. The proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants. Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like, h many cases, it will be preferable to include isotonic agents, for example, sugars, polyalcohols such as manitol, sorbitol, sodium chloride in the composition. Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, aluminum monostearate and gelatin. Sterile injectable solutions can be prepared by incorporating the active compound (e.g., an agent described herein) in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization. Generally, dispersions are prepared by incorporating the active compound into a sterile vehicle which contains a basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum drying and freeze-drying which yields a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.
In one embodiment, the active compounds are prepared with carriers that will protect the compound against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems. Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid. Methods for preparation of such formulations will be apparent to those skilled in the art. The materials can also be obtained commercially from Alza Corporation and Nova Pharmaceuticals, Inc. Liposomal suspensions (including hposomes targeted to infected cells with monoclonal antibodies to viral antigens) can also be used as pharmaceutically acceptable carriers. These can be prepared according to methods known to those skilled in the art, for example, as described in U.S. Patent No. 4,522,811. The pharmaceutical compositions can be included in a container, pack, or dispenser together with instructions for administration. In a preferred embodiment, the pharmaceutical composition is injected into an affected vessel, e.g., an artery, e.g., a coronary artery. In another embodiment, the pharmaceutical composition is delivered in association with a medical device that is introduced into an affected vessel, e.g., a stent that is introduced into the affected vessel. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In case of conflict, the present specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and not intended to be limiting. Other features and advantages of the invention will be apparent from the following detailed description, the drawings, and the claims.
EXAMPLES
Example 1: SERCA 2a expression in growing VSMC inhibits proliferation Rat aortic SMC were isolated from the media of the thoracic aorta from male Wistar rats as and cultured in DMEM supplemented with 1% penicillin-streptomycin- amphotericin mixture (ICN) and 10% fetal calf serum (FCS). At confluence they were passaged using trypsin. Cells between passage 2 to 8 were used. The rat VSMC were infected with adenovirus SERCA2a vector essentially as described in del Monte et al., 2001, Circulation 104:1424. Briefly, human SERCA2a cDNA was subcloned into the adenoviral shuttle vector (pAd.TRACK), which uses the cytomegalovirus (CMV) long terminal repeat as a promoter to make Ad-S2a vector. The shuttle vector used also has a concomitant green fluorescent protein (GFP) under the control of a separate CMV promoter. An adenovirus containing both β-galactosidase and GFP controlled by separate CMV promoters (Ad-βGal-GFP) was used as control. The adenoviruses were propagated in 293 cells. The recombinant adenoviruses were tested for the absence of wild-type virus by polymerase chain reaction of the early transcriptional unit El . Adenoviral infection was followed by monitoring the fluorescence of GFP. Significant increase in fluorescence was observed 4 days after infection (Fig 2A). Control cells as well as Ad-βGal-GFP infected cells did not express SERCA 2a. A high amount of SERCA 2a was present in Ad S2a-infected cells without much change in the level of SERCA 2b (Fig 2B). Proliferation of VSMC was measured by using the colorimetric-based CELLTITER96® Cell Proliferation Assay kit (Promega) according to manufacturer instructions. Between day 0 and day 4, the number of cells in control conditions and in cells infected with Ad βgal had increased 5 times whereas the number of Ad S2a- infected cells increased significantly less (p<0.01) (Fig. 2C), indicating that SERCA 2a prevents VSMC proliferation. This was also confirmed by immunolabelling with a-PCNA (Fig 2D). Indeed, the cell labelled with a-SERCA 2a did not express PCNA, a marker of S phase, whereas PCNA was present in non-infected cells or in cells infected with Ad-βGal. Accordingly, SERCA 2a prevents VSMC proliferation in vitro.
Example 2: SERCA 2a expression blocks the cell cycle at the Gl phase and prevents entry in the S phase The absence of PCNA in Ad-S2a-infected cells indicated that the cells did not enter the S phase. VSMCs were harvested by trypsinization and stained with propidium iodide and the DNA content and cell cycle were determined. Fluorescence of the nuclei after labelling with propidium iodide was analysed using a flowcytometer. In the control situation and in Ad-βGal-GFP infected cells the percentage of S gated events was approximately 50% and 46% respectively, whereas it was only approximately 30% in Ad-S2a-infected cells. No cells were in the subGl, indicating the absence of apoptosis.
Example 3: SERCA 2a expression prevents NFAT activation SERCA2a overexpression inhibits smooth muscle activation of NFAT and calcineurin, downstream markers of hypertrophy and proliferation (FIG. 3)
Example 4: Adenovirus-mediated expression of SERCA2a in balloon-injured rat carotid arteries decreases restenosis Balloon injured rat carotid arteries were infected with 1010 pfu Ad-S2a (n=4) or Ad-βGal-GFP (control virus). Fourteen days after infection, quantitative morphometry was performed on 5-μm sections from the transduced segment by an investigator blinded to the experimental procedure. At fourteen days after balloon injury and infection, the intima/media ratio was significantly lower in arteries infected with Ad-S2a (0.16 ± 0.08) than in control infected arteries (0.73±0.12). PO.05 for both.
Example 5: Other methods
Western blot analysis and immunofluorescence: Total cell lysates were prepared according to standard protocol (Upstate biotechnology, Technical Support). Cytosolic and nuclear fractions were obtained by hypotonic lysis. The protein content
was determined by using Bradford Protein Assay Reagent Kit (Bio-Rad). Lysates were matched for protein concentration, resolved by SDS-PAGE and transfened to Hybond-C (Amersham). The primary antibody was a-NFATcl from Santa Cruz Biotechnology, Inc (K-18). Proteins were visualized using a goat anti-rabbit secondary antibody conjugated to horseradish peroxidase and enhanced chemiluminescence's detection system (ECL+, Amersham). Immunofluorescence: immunofluorescence was performed on cell culture or cryosections for the carotid artery. Proteins were visualized by using either secondary antibodies directly conjugated to Texas Red or the biotin/streptavidin-Texas Red conjugated amplification method (Amersham). Antibodies to SERCA 2a and 2b were previously described. Anti-PCNA (proliferating nuclear antigen) was from Abeam (UK), a-GFP and a-NFATcl (K-18) were from Santa-Cruz. Nuclei were stained with Hoechst. Images were collected with a Zeiss LSM-510 confocal scanning laser microscope equipped with a 25 mW Argon laser and a lmW Helium-Neon laser, using a Plan Apochromat 63X objective (NA 1.40, oil immersion). Green fluorescence was observed with a 505-550 nm band-pass emission filter under 488 nm laser illumination and red fluorescence was observed with a 560 long-pass emission filter under 543 nm laser illumination. Pinholes are set at 1.0 Airy unit. Stacks of images were collected every 0.4 μm along the z-axis. Hoescht detection is done using the HBO mercury lamp (50W) and a set filter 01 (excitation BP 365/12, beamsplitter FT 395, emission LP 397). All settings were kept constant for comparison. For double immunofluorescence, dual excitation using the multitrack mode (images taken sequentially), was achieve using the Argon and He/Ne lasers respectively. Intracellular [Ca2+]i measurements: Cells were loaded with 4 μmol/L Fura 2 (Molecular Probes) and continously superfused with control or test solutions at 37°C using a PTR 200 perfusion temperature regulator (ALA Scientific Instruments,
Westbury, NY, USA). The control solution contained (mmol/L): NaCl, 116; KCL, 5.6; CaC12, 1.8; MgC12, 1.2; NaHCO3, 5; NaH2PO4, 1; HEPES, 20; pH 7.3. Caffeine (10 mmol/L), ATP (1, 10 and 100 μmol/L) or 2,5-di-(t-butyl)-l,4-benzo- hydroquinone (tBHQ, 50 μmol/L) were used in the test solution. The excitation light was supplied by a high pressure 100 W xenon arc lamp and the 340 and 380 nm wavelengths selected by a monochromator (Cairn Research Ltd, Faversham, Kent,
UK). Fluorescence images were collected every 2 seconds by a Sensicam QE CCD camera (PCO Computer Optics GmbH, Kelheim, Germany), digitized, and integrated in real time by an image processor (Metafluor, Princeton, NJ, USA). 340 and 380 background fluorescence signals were collected at the same rate and subsequently subtracted from respective fluorescent images. Results (ΔF/F) were expressed as ratios between 340 and 380 fluorescence signals measured during a response divided by the ratio measured in resting conditions, i.e. before the addition of an agent. DNA binding assay: Electromobility shift assay was performed using 0.5 ng of 32P-labelled double-stranded NFAT probe (NFATc gel shift oligonucleotide, Santa Cruz, sc-2577) and 15 μg of nuclear extracts. Reaction mixtures were subjected to electrophoresis on a 5% polyacrylamide gel in non-denaturing conditions.
Example 6 We evaluated the effect of SERCA2a gene transfer on blood vessels in rats after balloon injury. We found that, compared to controls, SERCA2a gene transfer can prevent formation of a neointima.
Methods. Balloon injury. After the left external carotid artery was exposed and heparin (35 IU) was administered intraperiotoneally, a 2Fr Fogarty embolectomy catheter
(Baxter Healthcare Corp) was introduced into an external carotid arteriotomy incision, advanced to the common carotid artery, and inflated at 2 atmosphere and withdrawn 3 times with rotation. The catheter was then removed, and a dwelling catheter was introduced into the arteriotomy site. After both the proximal common carotid artery and the proximal internal carotid artery were clamped, viral infusion mixtures with lxl 09 pfu of virus containing either SERCA2a or βgal diluted to a total volume of 100 μL was instilled via the arterial segment between the 2 clamps, and the external carotid artery was then ligated. Perfusion was restored in the common carotid artery after 30 minutes of instillation, and the neck incision was closed using 3-0 silk sutures. Histochemical analysis. The animals were sacrificed after 7 and 14 days. Both the right and left common carotids were dissected and included in frozen specimen
embedding solution. Transversal cryosections were performed on the middle portion of the artery and longitudinal sections on the proximal and distal portions. Hematoxylin-eosin staining was performed and the surface of lumen as well as the thickness of the media and intima were measured on at least 3-5 sections for different portions of the arteries. Expression of SERCA 2a was analysed by immunofluorescence using a rabbit antiS2a antibody followed by and anti-rabbit - TRITC secondary antibody. Four groups were considered: 1) Non injured, non infected corresponding to the right carotids, 2) Injured, non-infected corresponding to the left carotid were no GFP labelling could be detected, 3) Injured, infected with β-Gal and 4) injured infected with S2a. The left carotids included in those two groups displayed clear GFP labelling on unfixed sections.
Results and discussion As shown in Table 2, there was no difference in the lumen area or in the media thickness between groups. There was a tendency to the prevention of intimal thickening with S2a gene transfer but due to the small number of animals this was not significant (FIG. 4).
Table 2: Morphometric measurements.
We evaluated expression of the S2a in control and infected arteries. Expression of S2a is visualized in red by confocal imaging on 0.8 μm optical slices using a 63X oil immersion objective. In green is the auto-fluorescence of the elastin. The image were obtained using the multitrack mode with a He/Ne laser (ex: 543 nm- Em LP 560 nm) for the red fluorescence and with a Argon laser (Ex: 488nm- Em: bp 505-550) for the green fluorescence. DIG represents the same image in differential interferential contrast.
A high level of S2a was observed in the media of the control carotid. When the vessel is injured, the smooth muscle cells from the media start to proliferate and to migrate to the neomtima. We found that low level of S2a is observed in those cells, as seen in vitro. Infection with β-gal adenovirus did not prevent proliferation but restoration of a high level of S2a clearly inhibits the formation of the neointima. The differential interferential contrast image shows the adventitia which is not labelled with a-S2a indicating the absence of background.
Claims
1. A method of treating restenosis, the method comprising: identifying a subject in need of treatment, or at risk, for restenosis; and administering a nucleic acid that encodes a SERCA polypeptide in a blood vessel of the subject.
2. The method of claim 1 , wherein the SERCA polypeptide is SERCA1 a, SERCAlb, SERCA2a, SERCA2b or SERCA3 polypeptide.
3. The method of claim 1 , wherein the subj ect has undergone, is undergoing, or will undergo, angioplasty or balloon angioplasty.
4. The method of claim 1 , wherein the subject has undergone, is undergoing, or will undergo insertion of a stent.
5. The method of claim 1 , wherein the subj ect has undergone, is undergoing, or will undergo, insertion of a prosthesis, insertion of a graft, insertion of a stent, catheterization, or arterial blockage evaluation.
6. The method of any one of the preceding claims, wherein the method comprises implanting in the vessel a stent coated with or containing the agent.
7. The method of any one of the preceding claims, wherein the agent is packaged in a viral particle.
8. The method of claim 7, wherein the SERCA nucleic acid is a component of an adenovirus-based, adeno-associated virus-based, lentivirus-based or plasmid-based vector.
9. The method of claim 8, wherein the vector compromises the nucleic acid encoding SERCA operably linked to a viral or cardiac specific promoter.
10. The method of claim 8,. wherein the vector compromises the nucleic acid encoding SERCA operably linked to an inducible promoter.
11. A method of treating restenosis, the method comprising: identifying a subject having or at risk of having a restenotic vessel; and implanting in the vessel a stent coated with or containing a nucleic acid that encodes SERCA2a.
12. The method of claim 11 wherein the stent is coated with viral particles that include the nucleic acid that encodes SERCA.
13. A method of treating a cardiovascular disorder, the method comprising: implanting a stent that is coated with or containing a nucleic acid that encodes SERCA in a blood vessel of a subject.
14. The method of claim 13 wherein the stent is coated with viral particles that include the nucleic acid that encodes SERCA.
15. A method of treating a cardiovascular disorder, the method comprising: introducing a nucleic acid that encodes SERCA into cells of a blood vessel; and implanting a stent in the blood vessel.
16. The method of claim 15 wherein the nucleic acid is introduced into the cells before the stent is implanted.
17. The method of claim 15 wherein the nucleic acid is introduced into the cell concurrent with implanting the stent.
18. The method of claim 15 wherein the nucleic acid is introduced into the cells after the stent is implanted.
19. A stent coated with or containing an agent, the agent comprising a nucleic acid that encodes a SERCA protein.
20. The stent of claim 19, wherein the agent is a nucleic acid that encodes SERCA2a.
21. The stent of claim 19, wherein the agent is packaged in a viral particle.
22. A kit comprising a stent coated with, or containing, an agent comprising a nucleic acid that encodes a SERCA protein, and instructions for using the stent to treat restenosis.
23. The kit of claim 22, wherein the agent is a SERC A2a encoding nucleic acid.
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US49970503P | 2003-09-03 | 2003-09-03 | |
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