US20080124347A1 - Insulinotropic peptide conjugate using carrier substance - Google Patents
Insulinotropic peptide conjugate using carrier substance Download PDFInfo
- Publication number
- US20080124347A1 US20080124347A1 US11/747,153 US74715307A US2008124347A1 US 20080124347 A1 US20080124347 A1 US 20080124347A1 US 74715307 A US74715307 A US 74715307A US 2008124347 A1 US2008124347 A1 US 2008124347A1
- Authority
- US
- United States
- Prior art keywords
- insulinotropic peptide
- immunoglobulin
- region
- group
- exendin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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- 239000000863 peptide conjugate Substances 0.000 title claims abstract description 45
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Definitions
- the present invention relates to an insulinotropic peptide conjugate for long acting formulation of an insulinotropic peptide. Specifically, the present invention relates to a modified insulinotropic peptide conjugate having a remarkably improved in-vivo duration of efficacy by selectively binding with a specific amino acid residue, and modification of a specific amino acid residue, in order to remarkably increase the blood half-life by covalently linking the insulinotropic peptide with a non-peptidyl polymer and a carrier substance, and a method for preparation thereof.
- peptides tend to be easily denatured due to their low stability, degraded by in-vivo proteolytic enzymes, thus losing the activity, and have a relatively small size, thereby easily passing through the kidney. Accordingly, in order to maintain the blood levels and the titers of a medicament in blood comprising a peptide as a pharmaceutically effective component, it is necessary to administer the peptide drug frequently to a patient to maintain desired blood levels and titers.
- the peptide drugs are usually administered in the form of injectable preparations, and such frequent administration for maintaining the blood levels of the physiologically active peptides cause severe pain for the patients. To solve these problems, many efforts have been made.
- GLP-1 (7-37 or 7-36 amide), which functions to reduce the glucose concentration in blood for treating a Type 2 diabetes, has a short half-life of the physiological activity of about 4 minutes or less (Kreymann et al., 1987), due to loss of the titers of GLP-1 through the cleavage between the 8 th amino acid (Ala) and the 9 th amino acid (Asp) by a dipeptidyl pepdidase IV (DPP IV).
- Al 8 th amino acid
- Asp 9 th amino acid
- DPP IV dipeptidyl pepdidase IV
- an exendin-4 which is purified from the salivary gland of a glia monster (U.S. Pat. No. 5,424,686), has resistance to DPP IV, and higher physiological activity than GLP-1. As a result, it had an in-vivo half-life of 2 to 4 hours, which was longer than that of GLP-1.
- the physiological activity is not sufficiently sustained, and for example, in the case of a commercially available exendin-4 (exenatide), it needs to be injected to a patient twice a day, which is still difficult for patients.
- insulinotropic peptides have a problem, usually in that the size of the peptide is small. Thus, they cannot be recovered in the kidney, and are then extracorporeally discharged. Accordingly, a method for chemically adding a polymeric substance having high solubility, such as polyethylene glycol (PEG), onto the surface of the peptide to inhibit the loss in the kidney, has been used.
- a polymeric substance having high solubility such as polyethylene glycol (PEG)
- PEG non-specifically binds to a specific site or various sites of a target peptide to give an effect of increasing the molecular weight of a peptide, and thus inhibiting the loss by the kidney, and preventing hydrolysis, without causing any side-effects.
- International Pat. Publication No. WO 2006/076471 describes that PEG binds to a B-type natriuretic peptide, or BNP, which binds to NPR-A to activate the production of cGMP, which leads to reduction in the arterial blood pressure, and as a result, is used as congestive heart failure therapeutic agent, thereby sustaining the physiological activity.
- BNP B-type natriuretic peptide
- peptide linkers In order to maximize the effect of increasing the blood half-life, various kinds of peptide linkers are used, but an immune response may be possibly caused. Further, if a peptide having disulfide bonds, such as BNP is used, there is a high probability of misfolding. As a result, such peptide can hardly be used.
- a GLP-1 derivative, NN2211 is prepared by substitution of the amino acid of GLP-1, and is bound to an acyl side chain to form a non-covalent bond with albumin, thereby increasing its in-vivo residence time.
- it has a half-life of 11 to 15 hours, which does not indicate remarkable increase in the half-lives, as compared with the exendin-4.
- the GLP-1 derivative still needs to be injected once a day (Nauck et al., 2004).
- CJC-1131 is a GLP-1 derivative having a maleimide reactive group for covalently binding the GLP-1 with albumin in blood, and efforts had been tried to develop the CJC-1131 for the purpose of increasing the in-vivo half-life, but such efforts were now stopped.
- a subsequently suggested substance, CJC-1134 is an exendin-4 which covalently binds to a recombinant albumin, and did not exhibit a remarkable effect of increasing blood stability, with the blood half-life being about 17 hours (Rat) (Thibauoleau et. al., 2006).
- the present inventors used a preparation method, in which a carrier substance, a non-peptidyl polymer, and an insulinotropic peptide are site-specifically linked to an amino acid residue other than the amino terminus by a covalent bond, as a method for maximizing the effects of increasing the blood half-life of an insulinotropic peptide, and of maintaining the in-vivo activity.
- an insulinotropic peptide conjugate prepared by linking a non-peptidyl polymer to the lysine residue of the deaminated (DA) exendin-4, in which an amine group at the amino terminus of the exendin-4 of the insulinotropic peptides is deleted, exerts a remarkably increased in-vivo efficacy and half life, thereby completing the present invention.
- FIG. 1 shows the results of reverse phase HPLC for measurement of the purity of a native exendin-4(Lys)-PEG-immunoglobulin Fc conjugate
- FIG. 2 shows the results of reverse phase HPLC for measurement of the purity of a deaminated exendin-4(Lys)-PEG-immunoglobulin Fc conjugate
- FIG. 3 shows the results of measurement of the purity of a deaminated exendin-4(Lys)-PEG-immunoglobulin Fc conjugate by 12% SDS-PAGE;
- FIG. 4 shows the results of measurement of the glucose concentration reducing effect in blood of a deaminated exendin-4(Lys)-PEG-immunoglobulin Fc conjugate.
- a long acting insulinotropic peptide conjugate in which an insulinotropic peptide, a non-peptidyl polymer possessing a reactive group at both ends thereof, and a carrier substance are covalently linked to each other.
- the insulinotropic peptide of the present invention is a peptide possessing an insulinotropic function for promoting the synthesis and the expression of insulin in a pancreatic beta cell.
- These peptides include a precursor, a derivative, a fragment, and a variant, and preferably GLP (glucagon like peptide)-1, exendin 3, and exendin 4.
- GLP-1 is a hormone that is secreted by the small intestine, generally promotes the biosynthesis and secretion of insulin, inhibits the secretion of glucagon, and promotes glucose absorption in the cells.
- a glucagon precursor is decomposed into three peptides, that is, glucagon, GLP-1, and GLP-2.
- the GLP-1 means GLP-1 (1-37), which is originally in the form having no insulinotropic function. But it is then processed and converted into one in the activated GLP-1 (7-37) form.
- the sequence of the GLP-1 (7-37) amino acids is as follows:
- GLP-1 (7-37) HAEGT FTSDV SSYLE GQAAK EPIAW LVKGR G
- the GLP-1 derivative means a peptide which exhibits an amino acid sequence homology of at least 80% with that of GLP-1, may be in the chemically modified form, and exhibits an insulinotropic function of at least equivalent or more to that of GLP-1.
- the GLP-1 fragment means one in the form in which one or more amino acids are added or deleted at an amino terminus or a carboxyl terminus of a native GLP-1, wherein the added amino acid is possibly non-naturally occurring amino acid (e.g., D-type amino acid).
- the GLP-1 variant means a peptide possessing an insulinotropic function, which has one or more amino acid sequences different from those of a native GLP-1.
- exendin 3 and the exendin 4 are insulinotropic peptides consisting of 39 amino acids, which have a 53% amino acid sequence homology with GLP-1.
- the amino acid sequences of the exendin-3 and the exendin-4 are as follows:
- the exendin derivative means a peptide having at least 80% amino acid sequence homology with the native exendin, which may have some groups on the amino acid residue chemically substituted (e.g., alpha-methylation, alpha-hydroxylation), deleted (e.g., deamination), or modified (e.g., N-methylation), and has an insulinotropic function.
- the exendin fragment means a fragment having one or more amino acids added or deleted at the amino terminus or the carboxyl terminus of the native exendin, in which non-naturally occurring amino acids (for example, D-type amino acid) can be added, and has an insulinotropic function.
- non-naturally occurring amino acids for example, D-type amino acid
- the exendin variant means a peptide having at least one amino acid sequence different from that of the native exendin, in which has an insulinotropic function.
- the present invention includes an insulinotropic peptide having an amino acid sequence which have at least one different amino acids from those of native insulinotropic peptide, and having the amino acid residue at the amino terminus deaminated.
- the native insulinotropic peptide used in the present invention, and the modified insulinotropic peptide can be synthesized using a solid phase synthesis method, and most of the native peptides including a native insulinotropic peptide can be produced by a recombination technology.
- insulinotropic peptide used in the present invention can bind to the non-peptidyl polymer on various sites.
- the peptide conjugate prepared according to the present invention can have an activity which varies depending on the sites to be linked to the insulinotropic peptide.
- the aldehyde reactive group selectively binds to an amino terminus at a low pH, and can bind to a lysine residue to form a covalent bond at a high pH, such as pH 9.0.
- a pegylation reaction is allowed to proceed with varying pH, and then a positional isomer can be separated from the reaction mixture using an ion exchange column.
- a reactive thiol group can be introduced to the site of amino acid residue to be modified in the native amino acid sequence to form a covalent bond using a maleimide linker at the non-peptidyl polymer.
- a reactive amine group can be introduced to the site of amino acid residue to be modified in the native amino acid sequence to form a covalent bond using an aldehyde linker at the non-peptidyl polymer.
- the aldehyde linker at the non-peptidyl polymer When the aldehyde linker at the non-peptidyl polymer is used, it is reacted with an amino group at the amino terminus and the lysine residue, and a modified form of the insulinotropic peptide can be used to selectively increase the reaction yield. For example, only one amine group to be reacted can be retained on a desired site, using an amino terminus blocking method, a lysine residue substituting method, a method for introducing an amine group at a carboxyl terminus, or the like, thereby increasing the yield of pegylation and coupling reactions.
- the methods for protecting the amino terminus include dimethylation, as well as methylation, deamination, acetylation, etc., but are not limited to such alkylation methods.
- the insulinotropic peptide conjugate of the present invention is an insulinotropic peptide conjugate, in which an immunoglobulin Fc region specifically binds to an amine group other than ones at the amino terminus of the insulinotropic peptide.
- the present inventors induced a pegylation reaction to link a PEG to a lysine residue when coupling the PEG with a native exendin-4 at pH 9.0 as a method for selectively coupling the PEG with the lysine residue of the insulinotropic peptide, and as an alternative method, used a coupling method involving the synthesis of an exendin-4 having the coupled amino terminus deleted or protected.
- the exendin-4 was synthesized by deleting an alpha amine group on the N-terminal histidine, or two methyl groups were linked to the N-terminal histidine to prevent the linker PEG to bind to the N-terminus.
- Such method for modification of the amino terminus does not give any effect on the in vitro activity (Table 1).
- the DA exendin-4-PEG-immunoglobulin Fc conjugate prepared according to the present invention has a blood half-life which is remarkably increased by 50 hours or longer, while minimizing the titer reduction by coupling the lysine residue which does not affect the activity, and exhibiting unexpected in-vivo activity and duration of efficacy by removing the amine group at the amino terminus.
- a novel long acting exendin-4 formulation having a remarkably improved effect of the in-vivo efficacy and half-life could be prepared.
- the insulinotropic peptide used in the present invention is linked with a carrier substance and a non-peptidyl polymer.
- the carrier substance which can be used in the present invention can be selected from the group consisting of an immunoglobulin Fc region, albumin, transferrin, and PEG, and preferably it is an immunoglobulin Fc region.
- the immunoglobulin Fc region is safe for use as a drug carrier because it is a biodegradable polypeptide that is in vivo metabolized. Also, the immunoglobulin Fc region has a relatively low molecular weight, as compared to the whole immunoglobulin molecules, and thus, it is advantageous in the preparation, purification and yield of the conjugate. Since the immunoglobulin Fc region does not contain a Fab fragment, whose amino acid sequence differs according to the antibody subclasses and which thus is highly non-homogenous, it can be expected that the immunoglobulin Fc region may greatly increase the homogeneity of substances and be less antigenic.
- immunoglobulin Fc region refers to a protein that contains the heavy-chain constant region 2 (C H 2) and the heavy-chain constant region 3 (C H 3) of an immunoglobulin, and not the variable regions of the heavy and light chains, the heavy-chain constant region 1 (C H 1) and the light-chain constant region 1 (C L 1) of the immunoglobulin. It may further include a hinge region at the heavy-chain constant region.
- the immunoglobulin Fc region of the present invention may contain a part or all of the Fc region including the heavy-chain constant region 1 (C H 1) and/or the light-chain constant region 1 (C L 1), except for the variable regions of the heavy and light chains, as long as it has a physiological function substantially similar to or better than the native protein.
- the IgG Fc region may be a fragment having a deletion in a relatively long portion of the amino acid sequence of C H 2 and/or C H 3.
- the immunoglobulin Fc region of the present invention may comprise 1) a C H 1 domain, a C H 2 domain, a C H 3 domain and a C H 4 domain, 2) a C H 1 domain and a C H 2 domain, 3) a C H 1 domain and a C H 3 domain, 4) a C H 2 domain and a C H 3 domain, 5) a combination of one or more domains and an immunoglobulin hinge region (or a portion of the hinge region), and 6) a dimer of each domain of the heavy-chain constant regions and the light-chain constant region.
- the immunoglobulin Fc region of the present invention includes a native amino acid sequence, and a sequence derivative (mutant) thereof.
- An amino acid sequence derivative is a sequence that is different from the native amino acid sequence due to a deletion, an insertion, a non-conservative or conservative substitution or combinations thereof of one or more amino acid residues.
- amino acid residues known to be important in binding at positions 214 to 238, 297 to 299, 318 to 322, or 327 to 331, may be used as a suitable target for modification.
- a region capable of forming a disulfide bond is deleted, or certain amino acid residues are eliminated at the N-terminal end of a native Fc form or a methionine residue is added thereto.
- a deletion may occur in a complement-binding site, such as a C1q-binding site and an ADCC site.
- the Fc region may be modified by phosphorylation, sulfation, acrylation, glycosylation, methylation, farnesylation, acetylation, amidation, and the like.
- Fc derivatives are derivatives that have a biological activity identical to the Fc region of the present invention or improved structural stability, for example, against heat, pH, or the like.
- these Fc regions may be obtained from native forms isolated from humans and other animals including cows, goats, swine, mice, rabbits, hamsters, rats and guinea pigs, or may be recombinants or derivatives thereof, obtained from transformed animal cells or microorganisms.
- they may be obtained from a native immunoglobulin by isolating whole immunoglobulins from human or animal organisms and treating them with a proteolytic enzyme. Papain digests the native immunoglobulin into Fab and Fc regions, and pepsin treatment results in the production of pF′c and F(ab′)2 fragments. These fragments may be subjected, for example, to size exclusion chromatography to isolate Fc or pF′c.
- a human-derived Fc region is a recombinant immunoglobulin Fc region that is obtained from a microorganism.
- the immunoglobulin Fc region of the present invention may be in the form of having native sugar chains, increased sugar chains compared to a native form or decreased sugar chains compared to the native form, or may be in a deglycosylated form.
- the increase, decrease or removal of the immunoglobulin Fc sugar chains may be achieved by methods common in the art, such as a chemical method, an enzymatic method and a genetic engineering method using a microorganism.
- the removal of sugar chains from an Fc region results in a sharp decrease in binding affinity to the C1q part of the first complement component C1 and a decrease or loss in antibody-dependent cell-mediated cytotoxicity (ADCC) or complement-dependent cytotoxicity (CDC), thereby not inducing unnecessary immune responses in-vivo.
- an immunoglobulin Fc region in a deglycosylated or aglycosylated form may be more suitable to the object of the present invention as a drug carrier.
- deglycosylation refers to enzymatically remove sugar moieties from an Fc region
- amino acid sequence preferably E. coli
- the immunoglobulin Fc region may be derived from humans or other animals including cows, goats, swine, mice, rabbits, hamsters, rats and guinea pigs, and preferably humans.
- the immunoglobulin Fc region may be an Fc region that is derived from IgG, IgA, IgD, IgE and IgM, or that is made by combinations thereof or hybrids thereof.
- it is derived from IgG or IgM, which is among the most abundant proteins in human blood, and most preferably from IgG, which is known to enhance the half-lives of ligand-binding proteins.
- a dimer or multimer may be formed from two or more fragments selected from the group consisting of IgG Fc, IgA Fc, IgM Fc, IgD Fc, and IgE Fc fragments.
- hybrid means that sequences encoding two or more immunoglobulin Fc regions of different origin are present in a single-chain immunoglobulin Fc region.
- domain hybrids may be composed of one to four domains selected from the group consisting of CH1, CH2, CH3 and CH4 of IgG Fc, IgM Fc, IgA Fc, IgE Fc and IgD Fc, and may include the hinge region.
- IgG is divided into IgG1, IgG2, IgG3 and IgG4 subclasses, and the present invention includes combinations and hybrids thereof.
- Preferred are IgG2 and IgG4 subclasses, and most preferred is the Fc region of IgG4 rarely having effector functions such as CDC (complement dependent cytotoxicity).
- the most preferable immunoglobulin Fc region is a human IgG4-derived non-glycosylated Fc region.
- the human-derived Fc region is more preferable than a non-human derived Fc region, which may act as an antigen in the human body and cause undesirable immune responses such as the production of a new antibody against the antigen.
- non-peptidyl polymer refers to a biocompatible polymer including two or more repeating units linked to each other by a covalent bond excluding a peptide bond.
- the non-peptidyl polymer which can be used in the present invention may be selected form the group consisting of polyethylene glycol, polypropylene glycol, copolymers of ethylene glycol and propylene glycol, polyoxyethylated polyols, polyvinyl alcohol, polysaccharides, dextran, polyvinyl ethyl ether, biodegradable polymers such as PLA (poly(lactic acid)) and PLGA (polylactic-glycolic acid), lipid polymers, chitins, hyaluronic acid, and combinations thereof, and preferred is poly ethylene glycol. Also, derivatives thereof well known in the art and being easily prepared within the skill of the art are included in the scope of the present invention.
- the peptide linker which is used in the fusion protein obtained by a conventional inframe fusion method has drawbacks that it is easily in-vivo cleaved by a proteolytic enzyme, and thus a sufficient effect of increasing the blood half-life of the active drug by a carrier cannot be obtained as expected.
- a polymer having resistance to the proteolytic enzyme can be used to maintain the blood half-life of the peptide to be similar to that of the carrier. Therefore, any non-peptidyl polymer which can be used in the present invention can be used without any limitation, as long as it is a polymer having the aforementioned function, that is, a polymer having resistance to the in-vivo proteolytic enzyme.
- the non-peptidyl polymer preferably has a molecular weight in the range of 1 to 100 kDa, and preferably of 1 to 20 kDa.
- the non-peptidyl polymer of the present invention, linked to the carrier substance may be one polymer or a combination of different types of polymers.
- the non-peptidyl polymer used in the present invention has a reactive group capable of binding to the carrier substance and the protein drug.
- the non-peptidyl polymer has a reactive group at both ends, which is preferably selected from the group consisting of a reactive aldehyde group, a propionaldehyde group, a butyraldehyde group, a maleimide group and a succinimide derivative.
- the succinimide derivative may be succinimidyl propionate, hydroxy succinimidyl, succinimidyl carboxymethyl, or succinimidyl carbonate.
- the non-peptidyl polymer has a reactive aldehyde group at both ends, it is effective in linking at both ends with a physiologically active polypeptide and an immunoglobulin Fc region with minimal non-specific reactions.
- a final product generated by reductive alkylation by an aldehyde bond is much more stable than when linked by an amide bond.
- the aldehyde reactive group selectively binds to an amino terminus at a low pH, and can bind to a lysine residue to form a covalent bond at a high pH, such as pH 9.0.
- the reactive groups at both ends of the non-peptidyl polymer may be the same or different.
- the non-peptide polymer may possess a maleimide group at one end and, at the other end, an aldehyde group, a propionaldehyde group or a butyraldehyde group.
- the hydroxy group may be activated to various reactive groups by known chemical reactions, or a polyethylene glycol having a commercially available modified reactive group may be used so as to prepare the insulinotropic peptide conjugate of the present invention.
- the insulinotropic peptide conjugate of the present invention maintains the conventional in-vivo activities of the insulinotropic peptide, such as promotion of synthesis and secretion of insulin, appetite control, weight loss, increase in the beta cell sensitivity to glucose in blood, promotion of beta cell proliferation, delayed gastric emptying, and glucagon suppression, and further remarkably increases the blood half-life of the insulinotropic peptide, and hence the in-vivo efficacy sustaining effect of the peptide, it is useful to treat diabetes, obesity, acute coronary syndrome, or polycystic ovary syndrome.
- the present invention provides a method for preparing an insulinotropic peptide conjugate, comprising the steps of:
- the present invention provides a method for preparing an insulinotropic peptide conjugate, comprising the steps of:
- the present invention provides a pharmaceutical composition for treating diabetes, comprising the insulinotropic peptide conjugate of the present invention.
- the pharmaceutical composition comprising the conjugate of the present invention can further comprise a pharmaceutically acceptable carrier.
- the pharmaceutically acceptable carrier may include a binder, a lubricant, a disintegrator, an excipient, a solubilizer, a dispersing agent, a stabilizer, a suspending agent, a coloring agent, and a perfume.
- the pharmaceutically acceptable carrier may include a buffering agent, a preserving agent, an analgesic, a solubilizer, an isotonic agent, and a stabilizer.
- the pharmaceutically acceptable carrier may include a base, an excipient, a lubricant, and a preserving agent.
- the pharmaceutical composition of the present invention may be formulated into a variety of dosage forms in combination with the aforementioned pharmaceutically acceptable carriers.
- the pharmaceutical composition may be formulated into tablets, troches, capsules, elixirs, suspensions, syrups or wafers.
- the pharmaceutical composition may be formulated into a unit dosage form, such as a multidose container or an ampule as a single-dose dosage form.
- the pharmaceutical composition may be also formulated into solutions, suspensions, tablets, pills, capsules and long-acting preparations.
- examples of the carrier, the excipient, and the diluent suitable for the pharmaceutical formulations include lactose, dextrose, sucrose, sorbitol, mannitol, xylitol, erythritol, maltitol, starch, acacia rubber, alginate, gelatin, calcium phosphate, calcium silicate, cellulose, methylcellulose, microcrystalline cellulose, polyvinylpyrrolidone, water, methylhydroxybenzoate, propylhydroxybenzoate, talc, magnesium stearate and mineral oils.
- the pharmaceutical formulations may further include fillers, anti-coagulating agents, lubricants, humectants, perfumes, and antiseptics.
- the administration frequency and dose of the pharmaceutical composition of the present invention can be determined by several related factors including the types of diseases to be treated, administration routes, the patient's age, gender, weight and severity of the illness, as well as by the types of the drug as an active component. Since the pharmaceutical composition of the present invention has excellent duration of in-vivo efficacy and titer, it can remarkably reduce the administration frequency and dose of pharmaceutical drugs of the present invention.
- the present invention provides a method for treating diabetes, obesity, acute coronary syndrome, or polycystic ovary syndrome, comprising a step of administering the insulinotropic peptide conjugate, or a pharmaceutical composition containing the same of the present invention.
- administration means introduction of a predetermined amount of a substance into a patient by a certain suitable method.
- the conjugate of the present invention may be administered via any of the common routes, as long as it is able to reach a desired tissue.
- modes of administration are contemplated, including intraperitoneally, intravenously, intramuscularly, subcutaneously, intradermally, orally, topically, intranasally, intrapulmonarily and intrarectally, but the present invention is not limited to these exemplified modes of administration.
- active ingredients of a composition for oral administration should be coated or formulated for protection against degradation in the stomach.
- the present composition may be administered in an injectable form.
- the pharmaceutical composition of the present invention may be administered using a certain apparatus capable of transporting the active ingredients into a target cell.
- a mono-pegylated peptide was purified from each of the reaction solutions using SOURCE Q (XK 16 ml, Amersham Biosciences), and isomers were isolated using SOURCE S (XK 16 ml, Amersham Biosciences). It was found that a peak for pegylated N-terminus was found earlier, and then two peaks for pegylated lysine residues were found in turn.
- SOURCE Q (XK 16 ml, Amersham Biosciences) was used to purify mono-pegylated peptides. The reaction was performed at a ratio of peptide:immunoglobulin Fc of 1:15, and a total concentration of proteins of 80 mg/ml at 4° C. for 15 hours. The reaction was performed in a solution of 100 mM K—P (pH 6.0), and 20 mM SCB as a reducing agent was added thereto. After the coupling reaction, the two-step purification process using SOURCE Q 16 ml and SOURCE ISO 16 ml was the same as in Example 2. As the results of reverse phase HPLC, the purity was found to be 96%. [ FIG. 2 ]
- deaminated exendin-4 and human blood-derived albumin Green Cross, Korea
- a deaminated exendin-4(Lys)-albumin conjugate was prepared in the same method as described in EXAMPLE 4.
- the purity was found to be 95%.
- dimethyl exendin-4 American Peptide Inc., U.S.A.
- a dimethyl exendin-4(Lys)-immunoglobulin Fc conjugate was prepared in the same method as described in EXAMPLE 4.
- the purity was found to be 96%.
- GLP-1 American Peptide Inc., U.S.A.
- N GLP-1 (N)-immunoglobulin Fc conjugate was prepared in the same method as described in Example 2.
- the purity was found to be 96%.
- 3.4K-exendin-4 was prepared in the same method as described in Example 1. It was coupled immunoglobulin Fc in the same method as described in EXAMPLE 3.
- a method for measuring the in-vitro cell activity was used.
- insulinoma cells or islet of Langerhans were separated, and whether cAMP's in the cell was increased after treatment of GLP-1 was determined.
- RIN-m5F (ATCC.) cells, which are known as Rat insulinoma cells, were used. These cells have GLP-1 receptors, and thus they are often used in the methods for measuring the in-vitro activity in the GLP-1 family.
- RIN-m5F was treated with GLP-1, exendin-4, and test materials at varying concentrations. The occurrence of cAMP's, which are signaling molecules in the cells, by the test materials, was measured, and hence EC50 values, and compared to each other.
- DM exendin-4 Dimethyl exendin-4 DA exendin-4: Deaminated exendin-4 Exendin-4(N)-PEG-Fc: Conjugate in which the N-terminus of the exendin-4 and the Fc region were linked to PEG. Exendin-4(Lys)-PEG-Fc: Conjugate in which the lysine residue of the exendin-4 and the Fc region were linked to PEG. DM exendin-4(N)-PEG-Fc: Conjugate in which the N-terminus of the dimethyl exendin-4 and the Fc region were linked to PEG. DA exendin-4(Lys)-PEG-Fc: Conjugate in which the lysine residue of the deaminated exendin-4 and the Fc region were linked to PEG. N.D.: not determined
- the insulinotropic peptide of the present invention has the in-vivo activity which is maintained relatively high, and has remarkably increased blood half-life, and thus it can be desirably employed in the development of long acting formulations of various peptide drugs.
Abstract
The present invention relates to an insulinotropic peptide conjugate having improved in-vivo duration of efficacy and stability, comprising an insulinotropic peptide, a non-peptide polymer and a carrier substance, which are covalently linked to each other, and a use of the same. The insulinotropic peptide conjugate of the present invention has the in-vivo activity which is maintained relatively high, and has remarkably increased blood half-life, and thus it can be desirably employed in the development of long acting formulations of various peptide drugs.
Description
- 1. Technical Field
- The present invention relates to an insulinotropic peptide conjugate for long acting formulation of an insulinotropic peptide. Specifically, the present invention relates to a modified insulinotropic peptide conjugate having a remarkably improved in-vivo duration of efficacy by selectively binding with a specific amino acid residue, and modification of a specific amino acid residue, in order to remarkably increase the blood half-life by covalently linking the insulinotropic peptide with a non-peptidyl polymer and a carrier substance, and a method for preparation thereof.
- 2. Description of the Related Art
- Since peptides tend to be easily denatured due to their low stability, degraded by in-vivo proteolytic enzymes, thus losing the activity, and have a relatively small size, thereby easily passing through the kidney. Accordingly, in order to maintain the blood levels and the titers of a medicament in blood comprising a peptide as a pharmaceutically effective component, it is necessary to administer the peptide drug frequently to a patient to maintain desired blood levels and titers. However, the peptide drugs are usually administered in the form of injectable preparations, and such frequent administration for maintaining the blood levels of the physiologically active peptides cause severe pain for the patients. To solve these problems, many efforts have been made. As one of such efforts, there has been suggested an approach that transmission through the biological membrane of the peptide drug is increased, and then the peptide drug is transferred into the body by oropharyngeal or nasopharyngeal inhalation. However, this approach is still difficult in maintaining the in-vivo activity of the peptide drug due to the remarkably lower in-vivo transfer efficiency, as compared with injectable preparations.
- On the other hand, many efforts have been made to improve the blood stability of the peptide drug, and to maintain the drug in the blood at a high level for a prolonged period of time, thereby maximizing the pharmaceutical efficacy of the drug. The long acting preparation of such peptide drug therefore needs to increase the stability of the peptide drug, and to maintain the titers at sufficiently high levels without causing immune responses in patients.
- As a method for stabilizing the peptide, and inhibiting the degradation by a proteolytic enzyme, some trials have been performed to modify a specific amino acid sequence which is sensitive to the proteolytic enzyme. For example, GLP-1 (7-37 or 7-36 amide), which functions to reduce the glucose concentration in blood for treating a Type 2 diabetes, has a short half-life of the physiological activity of about 4 minutes or less (Kreymann et al., 1987), due to loss of the titers of GLP-1 through the cleavage between the 8th amino acid (Ala) and the 9th amino acid (Asp) by a dipeptidyl pepdidase IV (DPP IV). As a result, various investigations have been made on a GLP-1 analog having resistance to DPP IV, and trials have been made for substitution of Ala8 with Gly (Deacon et al., 1998; Burcelin et al., 1999), or with Leu or D-Ala (Xiao et al., 2001), thereby increasing the resistance to DPP IV, while maintaining the activity. The N-terminal amino acid, His7, of GLP-1 is critical for the GLP-1 activity, and serves as a target of DPP IV. Accordingly, U.S. Pat. No. 5,545,618 describes that the N-terminus is modified with an alkyl or acyl group, and Gallwitz, et al. describes that 7th His was subject to N-methylation, or alpha-methylation, or the entire His is substituted with imidazole to increase the resistance to DPP IV, and to maintain physiological activity.
- In addition to these modifications, an exendin-4, which is purified from the salivary gland of a glia monster (U.S. Pat. No. 5,424,686), has resistance to DPP IV, and higher physiological activity than GLP-1. As a result, it had an in-vivo half-life of 2 to 4 hours, which was longer than that of GLP-1. However, with the method for increasing the resistance to DPP IV only, the physiological activity is not sufficiently sustained, and for example, in the case of a commercially available exendin-4 (exenatide), it needs to be injected to a patient twice a day, which is still difficult for patients.
- These insulinotropic peptides have a problem, usually in that the size of the peptide is small. Thus, they cannot be recovered in the kidney, and are then extracorporeally discharged. Accordingly, a method for chemically adding a polymeric substance having high solubility, such as polyethylene glycol (PEG), onto the surface of the peptide to inhibit the loss in the kidney, has been used.
- PEG non-specifically binds to a specific site or various sites of a target peptide to give an effect of increasing the molecular weight of a peptide, and thus inhibiting the loss by the kidney, and preventing hydrolysis, without causing any side-effects. For example, International Pat. Publication No. WO 2006/076471 describes that PEG binds to a B-type natriuretic peptide, or BNP, which binds to NPR-A to activate the production of cGMP, which leads to reduction in the arterial blood pressure, and as a result, is used as congestive heart failure therapeutic agent, thereby sustaining the physiological activity. U.S. Pat. No. 6,924,264 describes that PEG binds to the lysine residue of an exendin-4 to increase its in-vivo residence time. However, this method increases the molecular weight of PEG, thereby increasing the in-vivo residence time of the peptide drug, while as the molecular weight is increased, the titer of the peptide drug is remarkably reduced, and the reactivity with the peptide is also reduced. Accordingly, it undesirably lowers the yield.
- International Pat. Publication No. WO 02/46227 describes a fusion protein prepared by coupling GLP-1, an exendin-4, or an analog thereof with human serum albumin or an immunoglobulin region (Fc) using a genetic recombination technology. U.S. Pat. No. 6,756,480 describes an Fc fusion protein prepared by coupling a parathyroid hormone (PTH) and an analog thereof with Fc region. These methods can address the problems such as low pegylation yield and non-specificity, but they still have a problem in that the effect of increasing the blood half-life is not noticeable as expected, and sometimes the titers are also low. In order to maximize the effect of increasing the blood half-life, various kinds of peptide linkers are used, but an immune response may be possibly caused. Further, if a peptide having disulfide bonds, such as BNP is used, there is a high probability of misfolding. As a result, such peptide can hardly be used.
- In addition, a GLP-1 derivative, NN2211, is prepared by substitution of the amino acid of GLP-1, and is bound to an acyl side chain to form a non-covalent bond with albumin, thereby increasing its in-vivo residence time. However, it has a half-life of 11 to 15 hours, which does not indicate remarkable increase in the half-lives, as compared with the exendin-4. Thus, the GLP-1 derivative still needs to be injected once a day (Nauck et al., 2004). Further, CJC-1131 is a GLP-1 derivative having a maleimide reactive group for covalently binding the GLP-1 with albumin in blood, and efforts had been tried to develop the CJC-1131 for the purpose of increasing the in-vivo half-life, but such efforts were now stopped. A subsequently suggested substance, CJC-1134, is an exendin-4 which covalently binds to a recombinant albumin, and did not exhibit a remarkable effect of increasing blood stability, with the blood half-life being about 17 hours (Rat) (Thibauoleau et. al., 2006).
- Thus, the present inventors used a preparation method, in which a carrier substance, a non-peptidyl polymer, and an insulinotropic peptide are site-specifically linked to an amino acid residue other than the amino terminus by a covalent bond, as a method for maximizing the effects of increasing the blood half-life of an insulinotropic peptide, and of maintaining the in-vivo activity. They have found that an insulinotropic peptide conjugate prepared by linking a non-peptidyl polymer to the lysine residue of the deaminated (DA) exendin-4, in which an amine group at the amino terminus of the exendin-4 of the insulinotropic peptides is deleted, exerts a remarkably increased in-vivo efficacy and half life, thereby completing the present invention.
- It is an object of the present invention to provide an excellent long acting preparation of insulinotropic peptide which maintains the in-vivo activity of the insulinotropic peptide, while extending the blood half-life.
-
FIG. 1 shows the results of reverse phase HPLC for measurement of the purity of a native exendin-4(Lys)-PEG-immunoglobulin Fc conjugate; -
FIG. 2 shows the results of reverse phase HPLC for measurement of the purity of a deaminated exendin-4(Lys)-PEG-immunoglobulin Fc conjugate; -
FIG. 3 shows the results of measurement of the purity of a deaminated exendin-4(Lys)-PEG-immunoglobulin Fc conjugate by 12% SDS-PAGE; and -
FIG. 4 shows the results of measurement of the glucose concentration reducing effect in blood of a deaminated exendin-4(Lys)-PEG-immunoglobulin Fc conjugate. - In one embodiment of the present invention for solving the above-described problems, there is provided a long acting insulinotropic peptide conjugate, in which an insulinotropic peptide, a non-peptidyl polymer possessing a reactive group at both ends thereof, and a carrier substance are covalently linked to each other.
- The insulinotropic peptide of the present invention is a peptide possessing an insulinotropic function for promoting the synthesis and the expression of insulin in a pancreatic beta cell. These peptides include a precursor, a derivative, a fragment, and a variant, and preferably GLP (glucagon like peptide)-1, exendin 3, and exendin 4.
- GLP-1 is a hormone that is secreted by the small intestine, generally promotes the biosynthesis and secretion of insulin, inhibits the secretion of glucagon, and promotes glucose absorption in the cells. In the small intestine, a glucagon precursor is decomposed into three peptides, that is, glucagon, GLP-1, and GLP-2. Here, the GLP-1 means GLP-1 (1-37), which is originally in the form having no insulinotropic function. But it is then processed and converted into one in the activated GLP-1 (7-37) form. The sequence of the GLP-1 (7-37) amino acids is as follows:
-
GLP-1 (7-37) HAEGT FTSDV SSYLE GQAAK EPIAW LVKGR G - The GLP-1 derivative means a peptide which exhibits an amino acid sequence homology of at least 80% with that of GLP-1, may be in the chemically modified form, and exhibits an insulinotropic function of at least equivalent or more to that of GLP-1.
- The GLP-1 fragment means one in the form in which one or more amino acids are added or deleted at an amino terminus or a carboxyl terminus of a native GLP-1, wherein the added amino acid is possibly non-naturally occurring amino acid (e.g., D-type amino acid).
- The GLP-1 variant means a peptide possessing an insulinotropic function, which has one or more amino acid sequences different from those of a native GLP-1.
- The exendin 3 and the exendin 4 are insulinotropic peptides consisting of 39 amino acids, which have a 53% amino acid sequence homology with GLP-1. The amino acid sequences of the exendin-3 and the exendin-4 are as follows:
-
Exendin-3 HSDGT FTSDL SKQME EEAVR LFIEW LKNGG PSSGA PPPS Exendin-4 HGEGT FTSDL SKQME EEAVR LFIEW LKNGG PSSGA PPPS - The exendin derivative means a peptide having at least 80% amino acid sequence homology with the native exendin, which may have some groups on the amino acid residue chemically substituted (e.g., alpha-methylation, alpha-hydroxylation), deleted (e.g., deamination), or modified (e.g., N-methylation), and has an insulinotropic function.
- The exendin fragment means a fragment having one or more amino acids added or deleted at the amino terminus or the carboxyl terminus of the native exendin, in which non-naturally occurring amino acids (for example, D-type amino acid) can be added, and has an insulinotropic function.
- The exendin variant means a peptide having at least one amino acid sequence different from that of the native exendin, in which has an insulinotropic function.
- Each of the preparation methods for the exendin derivative, the fragment, and the variant can be used individually or in combination. For example, the present invention includes an insulinotropic peptide having an amino acid sequence which have at least one different amino acids from those of native insulinotropic peptide, and having the amino acid residue at the amino terminus deaminated.
- The native insulinotropic peptide used in the present invention, and the modified insulinotropic peptide can be synthesized using a solid phase synthesis method, and most of the native peptides including a native insulinotropic peptide can be produced by a recombination technology.
- Further, the insulinotropic peptide used in the present invention can bind to the non-peptidyl polymer on various sites.
- The peptide conjugate prepared according to the present invention can have an activity which varies depending on the sites to be linked to the insulinotropic peptide.
- For example, it can be coupled with an amino terminus, and other terminus other than the amino terminus, such as a carboxyl terminus, respectively, which indicates difference in the in vitro activity. The aldehyde reactive group selectively binds to an amino terminus at a low pH, and can bind to a lysine residue to form a covalent bond at a high pH, such as pH 9.0. A pegylation reaction is allowed to proceed with varying pH, and then a positional isomer can be separated from the reaction mixture using an ion exchange column.
- If the insulinotropic peptide is to be coupled at a site other than the amino terminus which is an important site for the in-vivo activity, a reactive thiol group can be introduced to the site of amino acid residue to be modified in the native amino acid sequence to form a covalent bond using a maleimide linker at the non-peptidyl polymer.
- Further, a reactive amine group can be introduced to the site of amino acid residue to be modified in the native amino acid sequence to form a covalent bond using an aldehyde linker at the non-peptidyl polymer.
- When the aldehyde linker at the non-peptidyl polymer is used, it is reacted with an amino group at the amino terminus and the lysine residue, and a modified form of the insulinotropic peptide can be used to selectively increase the reaction yield. For example, only one amine group to be reacted can be retained on a desired site, using an amino terminus blocking method, a lysine residue substituting method, a method for introducing an amine group at a carboxyl terminus, or the like, thereby increasing the yield of pegylation and coupling reactions. The methods for protecting the amino terminus include dimethylation, as well as methylation, deamination, acetylation, etc., but are not limited to such alkylation methods.
- In one preferable embodiment, the insulinotropic peptide conjugate of the present invention is an insulinotropic peptide conjugate, in which an immunoglobulin Fc region specifically binds to an amine group other than ones at the amino terminus of the insulinotropic peptide.
- In one specific preferable embodiment, the present inventors induced a pegylation reaction to link a PEG to a lysine residue when coupling the PEG with a native exendin-4 at pH 9.0 as a method for selectively coupling the PEG with the lysine residue of the insulinotropic peptide, and as an alternative method, used a coupling method involving the synthesis of an exendin-4 having the coupled amino terminus deleted or protected. The exendin-4 was synthesized by deleting an alpha amine group on the N-terminal histidine, or two methyl groups were linked to the N-terminal histidine to prevent the linker PEG to bind to the N-terminus. Such method for modification of the amino terminus does not give any effect on the in vitro activity (Table 1).
- It can be found that if the PEG is coupled with the lysine residue rather than the amino terminus, the in vitro activity is maintained at about 6% (Table 1). Further, the DA exendin-4 conjugate obtained by using a deamination method for blocking the coupling reaction with the amino terminus exhibited the in vitro activity and the blood half-life, which were equivalent to those of a native exendin-4 conjugate (Table 1), but in the in-vivo efficacy test, it exhibited an unexpected excellent in-vivo duration of efficacy (
FIG. 4 ). Therefore, the DA exendin-4-PEG-immunoglobulin Fc conjugate prepared according to the present invention has a blood half-life which is remarkably increased by 50 hours or longer, while minimizing the titer reduction by coupling the lysine residue which does not affect the activity, and exhibiting unexpected in-vivo activity and duration of efficacy by removing the amine group at the amino terminus. As a result, a novel long acting exendin-4 formulation having a remarkably improved effect of the in-vivo efficacy and half-life could be prepared. - The insulinotropic peptide used in the present invention is linked with a carrier substance and a non-peptidyl polymer.
- The carrier substance which can be used in the present invention can be selected from the group consisting of an immunoglobulin Fc region, albumin, transferrin, and PEG, and preferably it is an immunoglobulin Fc region.
- The immunoglobulin Fc region is safe for use as a drug carrier because it is a biodegradable polypeptide that is in vivo metabolized. Also, the immunoglobulin Fc region has a relatively low molecular weight, as compared to the whole immunoglobulin molecules, and thus, it is advantageous in the preparation, purification and yield of the conjugate. Since the immunoglobulin Fc region does not contain a Fab fragment, whose amino acid sequence differs according to the antibody subclasses and which thus is highly non-homogenous, it can be expected that the immunoglobulin Fc region may greatly increase the homogeneity of substances and be less antigenic.
- The term “immunoglobulin Fc region”, as used herein, refers to a protein that contains the heavy-chain constant region 2 (CH2) and the heavy-chain constant region 3 (CH3) of an immunoglobulin, and not the variable regions of the heavy and light chains, the heavy-chain constant region 1 (CH1) and the light-chain constant region 1 (CL1) of the immunoglobulin. It may further include a hinge region at the heavy-chain constant region. Also, the immunoglobulin Fc region of the present invention may contain a part or all of the Fc region including the heavy-chain constant region 1 (CH1) and/or the light-chain constant region 1 (CL1), except for the variable regions of the heavy and light chains, as long as it has a physiological function substantially similar to or better than the native protein. Also, the IgG Fc region may be a fragment having a deletion in a relatively long portion of the amino acid sequence of CH2 and/or CH3. That is, the immunoglobulin Fc region of the present invention may comprise 1) a CH1 domain, a CH2 domain, a CH3 domain and a CH4 domain, 2) a CH1 domain and a CH2 domain, 3) a CH1 domain and a CH3 domain, 4) a CH2 domain and a CH3 domain, 5) a combination of one or more domains and an immunoglobulin hinge region (or a portion of the hinge region), and 6) a dimer of each domain of the heavy-chain constant regions and the light-chain constant region.
- The immunoglobulin Fc region of the present invention includes a native amino acid sequence, and a sequence derivative (mutant) thereof. An amino acid sequence derivative is a sequence that is different from the native amino acid sequence due to a deletion, an insertion, a non-conservative or conservative substitution or combinations thereof of one or more amino acid residues. For example, in an IgG Fc, amino acid residues known to be important in binding, at positions 214 to 238, 297 to 299, 318 to 322, or 327 to 331, may be used as a suitable target for modification. Also, other various derivatives are possible, including one in which a region capable of forming a disulfide bond is deleted, or certain amino acid residues are eliminated at the N-terminal end of a native Fc form or a methionine residue is added thereto. Further, to remove effector functions, a deletion may occur in a complement-binding site, such as a C1q-binding site and an ADCC site. Techniques of preparing such sequence derivatives of the immunoglobulin Fc region are disclosed in International Pat. Publication Nos. WO 97/34631 and WO 96/32478.
- Amino acid exchanges in proteins and peptides, which do not generally alter the activity of the proteins or peptides are known in the art (H. Neurath, R. L. Hill, The Proteins, Academic Press, New York, 1979). The most commonly occurring exchanges are Ala/Ser, Val/Ile, Asp/Glu, Thr/Ser, Ala/Gly, Ala/Thr, Ser/Asn, Ala/Val, Ser/Gly, Thy/Phe, Ala/Pro, Lys/Arg, Asp/Asn, Leu/Ile, Leu/Val, Ala/Glu and Asp/Gly, in both directions.
- In addition, the Fc region, if desired, may be modified by phosphorylation, sulfation, acrylation, glycosylation, methylation, farnesylation, acetylation, amidation, and the like.
- The aforementioned Fc derivatives are derivatives that have a biological activity identical to the Fc region of the present invention or improved structural stability, for example, against heat, pH, or the like.
- In addition, these Fc regions may be obtained from native forms isolated from humans and other animals including cows, goats, swine, mice, rabbits, hamsters, rats and guinea pigs, or may be recombinants or derivatives thereof, obtained from transformed animal cells or microorganisms. Herein, they may be obtained from a native immunoglobulin by isolating whole immunoglobulins from human or animal organisms and treating them with a proteolytic enzyme. Papain digests the native immunoglobulin into Fab and Fc regions, and pepsin treatment results in the production of pF′c and F(ab′)2 fragments. These fragments may be subjected, for example, to size exclusion chromatography to isolate Fc or pF′c.
- Preferably, a human-derived Fc region is a recombinant immunoglobulin Fc region that is obtained from a microorganism.
- In addition, the immunoglobulin Fc region of the present invention may be in the form of having native sugar chains, increased sugar chains compared to a native form or decreased sugar chains compared to the native form, or may be in a deglycosylated form. The increase, decrease or removal of the immunoglobulin Fc sugar chains may be achieved by methods common in the art, such as a chemical method, an enzymatic method and a genetic engineering method using a microorganism. The removal of sugar chains from an Fc region results in a sharp decrease in binding affinity to the C1q part of the first complement component C1 and a decrease or loss in antibody-dependent cell-mediated cytotoxicity (ADCC) or complement-dependent cytotoxicity (CDC), thereby not inducing unnecessary immune responses in-vivo. In this regard, an immunoglobulin Fc region in a deglycosylated or aglycosylated form may be more suitable to the object of the present invention as a drug carrier.
- As used herein, the term “deglycosylation” refers to enzymatically remove sugar moieties from an Fc region, and the term “aglycosylation” means that an Fc region is produced in an unglycosylated form by a prokaryote, preferably E. coli.
- On the other hand, the immunoglobulin Fc region may be derived from humans or other animals including cows, goats, swine, mice, rabbits, hamsters, rats and guinea pigs, and preferably humans. In addition, the immunoglobulin Fc region may be an Fc region that is derived from IgG, IgA, IgD, IgE and IgM, or that is made by combinations thereof or hybrids thereof. Preferably, it is derived from IgG or IgM, which is among the most abundant proteins in human blood, and most preferably from IgG, which is known to enhance the half-lives of ligand-binding proteins.
- On the other hand, the term “combination”, as used herein, means that polypeptides encoding single-chain immunoglobulin Fc regions of the same origin are linked to a single-chain polypeptide of a different origin to form a dimer or multimer. That is, a dimer or multimer may be formed from two or more fragments selected from the group consisting of IgG Fc, IgA Fc, IgM Fc, IgD Fc, and IgE Fc fragments.
- The term “hybrid”, as used herein, means that sequences encoding two or more immunoglobulin Fc regions of different origin are present in a single-chain immunoglobulin Fc region. In the present invention, various types of hybrids are possible. That is, domain hybrids may be composed of one to four domains selected from the group consisting of CH1, CH2, CH3 and CH4 of IgG Fc, IgM Fc, IgA Fc, IgE Fc and IgD Fc, and may include the hinge region.
- On the other hand, IgG is divided into IgG1, IgG2, IgG3 and IgG4 subclasses, and the present invention includes combinations and hybrids thereof. Preferred are IgG2 and IgG4 subclasses, and most preferred is the Fc region of IgG4 rarely having effector functions such as CDC (complement dependent cytotoxicity).
- That is, as the drug carrier of the present invention, the most preferable immunoglobulin Fc region is a human IgG4-derived non-glycosylated Fc region. The human-derived Fc region is more preferable than a non-human derived Fc region, which may act as an antigen in the human body and cause undesirable immune responses such as the production of a new antibody against the antigen.
- The term “non-peptidyl polymer”, as used herein, refers to a biocompatible polymer including two or more repeating units linked to each other by a covalent bond excluding a peptide bond.
- The non-peptidyl polymer which can be used in the present invention may be selected form the group consisting of polyethylene glycol, polypropylene glycol, copolymers of ethylene glycol and propylene glycol, polyoxyethylated polyols, polyvinyl alcohol, polysaccharides, dextran, polyvinyl ethyl ether, biodegradable polymers such as PLA (poly(lactic acid)) and PLGA (polylactic-glycolic acid), lipid polymers, chitins, hyaluronic acid, and combinations thereof, and preferred is poly ethylene glycol. Also, derivatives thereof well known in the art and being easily prepared within the skill of the art are included in the scope of the present invention.
- The peptide linker which is used in the fusion protein obtained by a conventional inframe fusion method has drawbacks that it is easily in-vivo cleaved by a proteolytic enzyme, and thus a sufficient effect of increasing the blood half-life of the active drug by a carrier cannot be obtained as expected. However, in the present invention, a polymer having resistance to the proteolytic enzyme can be used to maintain the blood half-life of the peptide to be similar to that of the carrier. Therefore, any non-peptidyl polymer which can be used in the present invention can be used without any limitation, as long as it is a polymer having the aforementioned function, that is, a polymer having resistance to the in-vivo proteolytic enzyme. The non-peptidyl polymer preferably has a molecular weight in the range of 1 to 100 kDa, and preferably of 1 to 20 kDa. Also, the non-peptidyl polymer of the present invention, linked to the carrier substance, may be one polymer or a combination of different types of polymers.
- The non-peptidyl polymer used in the present invention has a reactive group capable of binding to the carrier substance and the protein drug.
- The non-peptidyl polymer has a reactive group at both ends, which is preferably selected from the group consisting of a reactive aldehyde group, a propionaldehyde group, a butyraldehyde group, a maleimide group and a succinimide derivative. The succinimide derivative may be succinimidyl propionate, hydroxy succinimidyl, succinimidyl carboxymethyl, or succinimidyl carbonate. In particular, when the non-peptidyl polymer has a reactive aldehyde group at both ends, it is effective in linking at both ends with a physiologically active polypeptide and an immunoglobulin Fc region with minimal non-specific reactions. A final product generated by reductive alkylation by an aldehyde bond is much more stable than when linked by an amide bond. The aldehyde reactive group selectively binds to an amino terminus at a low pH, and can bind to a lysine residue to form a covalent bond at a high pH, such as pH 9.0.
- The reactive groups at both ends of the non-peptidyl polymer may be the same or different. For example, the non-peptide polymer may possess a maleimide group at one end and, at the other end, an aldehyde group, a propionaldehyde group or a butyraldehyde group. When a polyethylene glycol having a reactive hydroxy group at both ends thereof is used as the non-peptidyl polymer, the hydroxy group may be activated to various reactive groups by known chemical reactions, or a polyethylene glycol having a commercially available modified reactive group may be used so as to prepare the insulinotropic peptide conjugate of the present invention.
- The insulinotropic peptide conjugate of the present invention maintains the conventional in-vivo activities of the insulinotropic peptide, such as promotion of synthesis and secretion of insulin, appetite control, weight loss, increase in the beta cell sensitivity to glucose in blood, promotion of beta cell proliferation, delayed gastric emptying, and glucagon suppression, and further remarkably increases the blood half-life of the insulinotropic peptide, and hence the in-vivo efficacy sustaining effect of the peptide, it is useful to treat diabetes, obesity, acute coronary syndrome, or polycystic ovary syndrome.
- In another embodiment, the present invention provides a method for preparing an insulinotropic peptide conjugate, comprising the steps of:
- (1) covalently linking a non-peptidyl polymer having a reactive group selected from the group consisting of aldehyde, maleimide, and succinimide derivatives at both ends thereof, with an amine group or thiol group of the insulinotropic peptide;
- (2) isolating a conjugate comprising the insulinotropic peptide from the reaction mixture of (1), in which the non-peptidyl polymer is linked covalently to a site other than the amino terminus; and
- (3) covalently linking a carrier substance to the other end of the non-peptidyl polymer of the isolated conjugate to produce a peptide conjugate comprising the carrier substance and the insulinotropic peptide, which are linked to each end of the non-peptidyl polymer.
- In a preferable embodiment, the present invention provides a method for preparing an insulinotropic peptide conjugate, comprising the steps of:
- (1) covalently linking a non-peptidyl polymer having an aldehyde reactive group at both ends thereof with the lysine residue of the insulinotropic peptide;
- (2) isolating a conjugate comprising the insulinotropic peptide from the reaction mixture of (1), in which the non-peptidyl polymer is linked covalently to the lysine residue; and
- (3) covalently linking a carrier substance to the other end of the non-peptidyl polymer of the isolated conjugate to produce a protein conjugate comprising the carrier substance and the insulinotropic peptide, which are linked to each end of the non-peptidyl polymer. More preferably, the non-peptidyl polymer of (1), and the lysine residue of the insulinotropic peptide are linked at pH 9.0 or higher.
- In a further embodiment, the present invention provides a pharmaceutical composition for treating diabetes, comprising the insulinotropic peptide conjugate of the present invention.
- The pharmaceutical composition comprising the conjugate of the present invention can further comprise a pharmaceutically acceptable carrier. For oral administration, the pharmaceutically acceptable carrier may include a binder, a lubricant, a disintegrator, an excipient, a solubilizer, a dispersing agent, a stabilizer, a suspending agent, a coloring agent, and a perfume. For injectable preparations, the pharmaceutically acceptable carrier may include a buffering agent, a preserving agent, an analgesic, a solubilizer, an isotonic agent, and a stabilizer. For preparations for topical administration, the pharmaceutically acceptable carrier may include a base, an excipient, a lubricant, and a preserving agent. The pharmaceutical composition of the present invention may be formulated into a variety of dosage forms in combination with the aforementioned pharmaceutically acceptable carriers. For example, for oral administration, the pharmaceutical composition may be formulated into tablets, troches, capsules, elixirs, suspensions, syrups or wafers. For injectable preparations, the pharmaceutical composition may be formulated into a unit dosage form, such as a multidose container or an ampule as a single-dose dosage form. The pharmaceutical composition may be also formulated into solutions, suspensions, tablets, pills, capsules and long-acting preparations.
- On the other hand, examples of the carrier, the excipient, and the diluent suitable for the pharmaceutical formulations include lactose, dextrose, sucrose, sorbitol, mannitol, xylitol, erythritol, maltitol, starch, acacia rubber, alginate, gelatin, calcium phosphate, calcium silicate, cellulose, methylcellulose, microcrystalline cellulose, polyvinylpyrrolidone, water, methylhydroxybenzoate, propylhydroxybenzoate, talc, magnesium stearate and mineral oils. In addition, the pharmaceutical formulations may further include fillers, anti-coagulating agents, lubricants, humectants, perfumes, and antiseptics.
- The administration frequency and dose of the pharmaceutical composition of the present invention can be determined by several related factors including the types of diseases to be treated, administration routes, the patient's age, gender, weight and severity of the illness, as well as by the types of the drug as an active component. Since the pharmaceutical composition of the present invention has excellent duration of in-vivo efficacy and titer, it can remarkably reduce the administration frequency and dose of pharmaceutical drugs of the present invention.
- In a further embodiment, the present invention provides a method for treating diabetes, obesity, acute coronary syndrome, or polycystic ovary syndrome, comprising a step of administering the insulinotropic peptide conjugate, or a pharmaceutical composition containing the same of the present invention.
- The term “administration”, as used herein, means introduction of a predetermined amount of a substance into a patient by a certain suitable method. The conjugate of the present invention may be administered via any of the common routes, as long as it is able to reach a desired tissue. A variety of modes of administration are contemplated, including intraperitoneally, intravenously, intramuscularly, subcutaneously, intradermally, orally, topically, intranasally, intrapulmonarily and intrarectally, but the present invention is not limited to these exemplified modes of administration. However, since peptides are digested upon oral administration, active ingredients of a composition for oral administration should be coated or formulated for protection against degradation in the stomach. Preferably, the present composition may be administered in an injectable form. In addition, the pharmaceutical composition of the present invention may be administered using a certain apparatus capable of transporting the active ingredients into a target cell.
- A better understanding of the present invention may be obtained through the following examples which are set forth to illustrate, but are not to be construed as the limit of the present invention.
- 3.4K ButyrALD(2) PEG (PEG having two butyraldehyde groups) and the N-terminus of the exendin-4 (AP, USA) were subject to pegylation by reacting the peptide and the PEG at 4° C. for 90 min at a molar ratio of 1:15, with a peptide concentration of 3 mg/ml. At this time, the reaction was performed in a NaOAc buffer at pH 4.0 at a concentration of 100 mM, and 20 mM SCB (NaCNBH3) as a reducing agent was added thereto to perform the reaction. 3.4K ButyrALD(2) PEG and the lysine(Lys) residue of the exendin-4 were subject to pegylation by reacting the peptide and the PEG at 4° C. for 3 hours at a molar ratio of 1:30, with a peptide concentration of 3 mg/ml. At this time, the reaction was performed in a Na-Borate buffer at pH 9.0 at a concentration of 100 mM, and 20 mM SCB as a reducing agent was added thereto to perform the reaction. A mono-pegylated peptide was purified from each of the reaction solutions using SOURCE Q (XK 16 ml, Amersham Biosciences), and isomers were isolated using SOURCE S (XK 16 ml, Amersham Biosciences). It was found that a peak for pegylated N-terminus was found earlier, and then two peaks for pegylated lysine residues were found in turn.
- Column: SOURCE Q (XK 16 ml, Amersham Biosciences)
- Flow rate: 2.0 ml/min
- Gradient: A 0 →40% 80 min B (A: 20 mM Tris pH 8.5, B: A+0.5 M NaCl)
- Column: SOURCE S (XK 16 ml, Amersham Biosciences)
- Flow rate: 2.0 ml/min
- Gradient: A 0→100% 45 min B (A: 20 mM citric acid pH 3.0, B: A+0.5 M KCl)
- Using the same method as described in EXAMPLE 1, 3.4K ButyrALD(2) PEG and the N-terminus of the exendin-4 were reacted, and only the N-terminal isomers were purified, and then coupled with immunoglobulin Fc. The reaction was performed at a ratio of peptide:immunoglobulin Fc of 1:8, and a total concentration of proteins of 50 mg/ml at 4° C. for 17 hours. The reaction was performed in a solution of 100 mM K—P (pH 6.0), and 20 mM SCB as a reducing agent was added thereto. The coupling reaction solution was purified using two purification columns. First, SOURCE Q (XK 16 ml, Amersham Biosciences) was used to remove a large amount of immunoglobulin Fc which had not participated in the coupling reaction. Using 20 mM Tris (pH 7.5) and 1 M NaCl with salt gradients, the immunoglobulin Fc having relatively weak binding power was eluted earlier, and then the exendin-4-immunoglobulin Fc was eluted. Through this first purification procedure, immunoglobulin Fc was removed to some degree, but since the immunoglobulin Fc and the exendin-4-immunoglobulin Fc have similar binding powers to each other in the ion exchange column, they could not be completely separated from each other. Accordingly, secondary purification was performed using hydrophobicity of each of two materials. Using 20 mM Tris (pH7.5) 1.5 M ammonium sulfate in SOURCE ISO(HR 16 ml, Amersham Biosciences), the first purified samples were coupled, and the sample was eluted with gradually reducing the concentration of ammonium sulfate. In the HIC Column, the immunoglobulin Fc having weak binding power was eluted earlier, and then the exendin-4-immunoglobulin Fc sample having strong binding power was eluted. However, since they have prominently different hydrophobicity, they can be more easily separated from each other than in the ion exchange column.
- Column: SOURCE Q (XK 16 ml, Amersham Biosciences)
- Flow rate: 2.0 ml/min
- Gradient: A 0→25% 60 min B (A: 20 mM Tris pH7.5, B: A+1 M NaCl)
- Column: SOURCE ISO(HR 16 ml, Amersham Biosciences)
- Flow rate: 7.0 ml/min
- Gradient: B 100→0% 80 min B (A: 20 mM Tris pH7.5, B: A+1.5 M ammonium sulfate)
- Using the same method as described in EXAMPLE 1, 3.4K ButyrALD(2) PEG and the lysine(Lys) of the exendin-4 were reacted, and only the Lys isomers were purified, and then coupled with immunoglobulin Fc. Coupling was performed using an isomer peak in the last portion, discrete from the N-terminal isomer peaks, indicating that the reaction proceeded well among the isomer peaks. The reaction was performed at a ratio of peptide:immunoglobulin Fc of 1:8, and a total concentration of proteins of 50 mg/ml at 4° C. for 16 hours. The reaction was performed in a solution of 100 mM K—P (pH 6.0), and 20 mM SCB as a reducing agent was added thereto. After the coupling reaction, the two-step purification process using SOURCE Q 16 ml and SOURCE ISO 16 ml was the same as in EXAMPLE 2. As the results of reverse phase HPLC, the purity was found to be 99%. [
FIG. 1 ] - Using deaminated exendin-4 (Anygen Inc., Korea), 3.4K ButyrALD(2) PEG was reacted with Lys of the deamination exendin-4 in the same method as described in EXAMPLE 1. Then, without separation of isomers, the monomers only were purified, and then coupled with immunoglobulin Fc. They were allowed to react at room temperature for 3 hours at a molar ratio of peptide:3.4K ButyrALD(2) of 1:30, and a concentration of peptide of 3 mg/ml. The reaction was performed in a solution of 100 mM Na-Borate (pH 9.0), and 20 mM SCB as a reducing agent was added thereto. SOURCE Q (XK 16 ml, Amersham Biosciences) was used to purify mono-pegylated peptides. The reaction was performed at a ratio of peptide:immunoglobulin Fc of 1:15, and a total concentration of proteins of 80 mg/ml at 4° C. for 15 hours. The reaction was performed in a solution of 100 mM K—P (pH 6.0), and 20 mM SCB as a reducing agent was added thereto. After the coupling reaction, the two-step purification process using SOURCE Q 16 ml and SOURCE ISO 16 ml was the same as in Example 2. As the results of reverse phase HPLC, the purity was found to be 96%. [
FIG. 2 ] - Using deaminated exendin-4 and human blood-derived albumin (Green Cross, Korea) as a carrier substance, a deaminated exendin-4(Lys)-albumin conjugate was prepared in the same method as described in EXAMPLE 4. As the results of reverse phase HPLC, the purity was found to be 95%.
- Using dimethyl exendin-4 (American Peptide Inc., U.S.A.), a dimethyl exendin-4(Lys)-immunoglobulin Fc conjugate was prepared in the same method as described in EXAMPLE 4. As the results of reverse phase HPLC, the purity was found to be 96%.
- Using GLP-1 (American Peptide Inc., U.S.A.), a GLP-1 (N)-immunoglobulin Fc conjugate was prepared in the same method as described in Example 2. As the results of reverse phase HPLC, the purity was found to be 96%.
- Using 3.4K PropionALD(2) PEG (PEG having two propionaldehyde groups), 3.4K-exendin-4 was prepared in the same method as described in Example 1. It was coupled immunoglobulin Fc in the same method as described in EXAMPLE 3.
- To measure the efficacy of long acting preparation of exendin-4, a method for measuring the in-vitro cell activity was used. Typically, in order to measure the in-vitro activity of GLP-1, insulinoma cells or islet of Langerhans were separated, and whether cAMP's in the cell was increased after treatment of GLP-1 was determined.
- For the method for measuring the in-vitro activity used in the present test, RIN-m5F (ATCC.) cells, which are known as Rat insulinoma cells, were used. These cells have GLP-1 receptors, and thus they are often used in the methods for measuring the in-vitro activity in the GLP-1 family. RIN-m5F was treated with GLP-1, exendin-4, and test materials at varying concentrations. The occurrence of cAMP's, which are signaling molecules in the cells, by the test materials, was measured, and hence EC50 values, and compared to each other.
-
TABLE 1 Blood Test materials half-life (hours) In vitro titer (%) Exendin-4 0.7 100 DM exendin-4 N.D. 92.7 DA exendin-4 N.D. 118 Exendin-4(N)-PEG-Fc 61.5 <0.2 Exendin-4(Lys)-PEG-Fc 70.5 9.3 DM exendin-4(Lys)-PEG-Fc 68.6 2.6 DA exendin-4(Lys)-PEG-Fc 51.6 12.5 DA exendin-4(Lys)-PEG-albumin N.D. 2.9 DM exendin-4: Dimethyl exendin-4 DA exendin-4: Deaminated exendin-4 Exendin-4(N)-PEG-Fc: Conjugate in which the N-terminus of the exendin-4 and the Fc region were linked to PEG. Exendin-4(Lys)-PEG-Fc: Conjugate in which the lysine residue of the exendin-4 and the Fc region were linked to PEG. DM exendin-4(N)-PEG-Fc: Conjugate in which the N-terminus of the dimethyl exendin-4 and the Fc region were linked to PEG. DA exendin-4(Lys)-PEG-Fc: Conjugate in which the lysine residue of the deaminated exendin-4 and the Fc region were linked to PEG. N.D.: not determined -
TABLE 2 Test materials In vitro titer (%) GLP-1 100 E-4 422 GLP-1 (N)-PEG-Fc <0.1 - To measure the efficacy of the exendin-4 long acting preparation, a method for measuring the effect of reducing the glucose concentration in blood without limitation on the feeds for db/db mice was used (
FIG. 4 ). It was found that the native exendin-4 conjugate did not show reduction in the glucose concentration in blood after 192 hours, while the DA exendin-4 conjugate maintained reduction in the glucose concentration in blood for 240 hours or longer even when administered once. - The insulinotropic peptide of the present invention has the in-vivo activity which is maintained relatively high, and has remarkably increased blood half-life, and thus it can be desirably employed in the development of long acting formulations of various peptide drugs.
- The various embodiments described above can be combined to provide further embodiments. All of the U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications referred to in this specification and/or listed in the Application Data Sheet, are incorporated herein by reference, in their entirety. Aspects of the embodiments can be modified, if necessary to employ concepts of the various patents, applications and publications to provide yet further embodiments.
- These and other changes can be made to the embodiments in light of the above-detailed description. In general, in the following claims, the terms used should not be construed to limit the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.
Claims (25)
1. An insulinotropic peptide conjugate, comprising an insulinotropic peptide and an immunoglobulin Fc region, which are linked by a non-peptidyl polymer, wherein the non-peptidyl polymer is selected from the group consisting of polyethylene glycol, polypropylene glycol, copolymers of ethylene glycol and propylene glycol, polyoxyethylated polyols, polyvinyl alcohol, polysaccharides, dextran, polyvinyl ethyl ether, biodegradable polymers, lipid polymers, chitins, hyaluronic acid, and combinations thereof, and wherein one end of the non-peptidyl polymer is linked to an amino acid residue other than the amino terminus of the insulinotropic peptide.
2. The insulinotropic peptide conjugate according to claim 1 , wherein the insulinotropic peptide is selected from the group consisting of GLP-1, an exendin-3, an exendin-4, and a derivative, a fragment and a variant thereof.
3. The insulinotropic peptide conjugate according to claim 2 , wherein the derivative is selected from the group consisting of a peptide possessing an insulinotropic function and having an amine group at the amino terminus of the native insulinotropic peptide substituted, deleted, or modified, and a fragment and a variant thereof.
4. An insulinotropic peptide conjugate, in which a derivative of exendin-4, and an immunoglobulin Fc region are linked by a non-peptidyl polymer, wherein the derivative of exendin-4 has an amino group at the amino terminus substituted, deleted, or modified, wherein the non-peptidyl polymer is selected from the group consisting of polyethylene glycol, polypropylene glycol, copolymers of ethylene glycol and propylene glycol, polyoxyethylated polyols, polyvinyl alcohol, polysaccharides, dextran, polyvinyl ethyl ether, biodegradable polymers, lipid polymers, chitins, hyaluronic acid, and combinations thereof, and wherein the insulinotropic peptide conjugate has improved effects of reducing glucose levels in blood and has increased duration of in-vivo efficacy, as compared with a conjugate containing a native exendin-4.
5. The insulinotropic peptide conjugate according to claim 4 , wherein the derivative of exendin-4 is a deaminated exendin-4 prepared by deletion of an amine group at the amino terminus of the exendin-4.
6. An insulinotropic peptide conjugate, in which a deaminated exendin-4 prepared by deletion of an amine group at the amino terminus of the exendin-4, and albumin are linked by a non-peptidyl polymer, wherein the non-peptidyl polymer is selected from the group consisting of polyethylene glycol, polypropylene glycol, copolymers of ethylene glycol and propylene glycol, polyoxyethylated polyols, polyvinyl alcohol, polysaccharides, dextran, polyvinyl ethyl ether, biodegradable polymers, lipid polymers, chitins, hyaluronic acid, and combinations thereof, and wherein the insulinotropic peptide conjugate has improved effects of reducing glucose levels in blood and has increased duration of in vivo efficacy, as compared with a conjugate containing a native exendin-4.
7. The insulinotropic peptide conjugate according to claim 1 , wherein the non-peptidyl polymer has both ends, each binding to an amine group or a thiol group of the immunoglobulin Fc region, and the insulinotropic peptide.
8. The insulinotropic peptide conjugate according to claim 1 , wherein the immunoglobulin Fc region is deglycosylated.
9. The insulinotropic peptide conjugate according to claim 1 , wherein the immunoglobulin Fc region is composed of one to four domains selected from the group consisting of CH1, CH2, CH3 and CH4 domains.
10. The insulinotropic peptide conjugate according to claim 9 , wherein the immunoglobulin Fc region further includes a hinge region.
11. The insulinotropic peptide conjugate according to claim 1 , wherein the immunoglobulin Fc region is an Fc region derived from IgG, IgA, IgD, IgE, or IgM.
12. The insulinotropic peptide conjugate according to claim 11 , wherein each domain of the immunoglobulin Fc region is a domain hybrid of a different origin derived from an immunoglobulin selected from the group consisting of IgG, IgA, IgD, IgE, and IgM.
13. The insulinotropic peptide conjugate according to claim 11 , wherein the immunoglobulin Fc region is a dimer or a multimer (a combination of immunoglobulin Fc) composed of single-chain immunoglobulins of the same origin.
14. The insulinotropic peptide conjugate according to claim 11 , wherein the immunoglobulin Fc region is an IgG4 Fc region.
15. The insulinotropic peptide conjugate according to claim 14 , wherein the immunoglobulin Fc region is a human deglycosylated IgG4 Fc region.
16. The insulinotropic peptide conjugate according to claim 1 , wherein the reactive group of the non-peptidyl polymer is selected from the group consisting of an aldehyde group, a propionaldehyde group, a butyraldehyde group, a maleimide group, and a succinimide derivative.
17. The insulinotropic peptide conjugate according to claim 16 , wherein the succinimide derivative is succinimidyl propionate, succinimidyl carboxymethyl, hydroxy succinimidyl, or succinimidyl carbonate.
18. The insulinotropic peptide conjugate according to claim 17 , wherein the non-peptidyl polymer has a reactive aldehyde group at both ends.
19. The insulinotropic peptide conjugate according to claim 18 , wherein the non-peptidyl polymer is polyethylene glycol.
20. A method for preparing an insulinotropic peptide conjugate, comprising the steps of:
(1) covalently linking a non-peptidyl polymer having a reactive group selected from the group consisting of aldehyde, maleimide, and succinimide derivatives at both ends thereof, with an amine or thiol group of an insulinotropic peptide;
(2) isolating a conjugate comprising the insulinotropic peptide from the reaction mixture of (1), in which the non-peptidyl polymer is linked covalently to a site other than the amino terminus; and
(3) covalently linking an immunoglobulin Fc region to the other end of the non-peptidyl polymer of the isolated conjugate to produce a peptide conjugate comprising the immunoglobulin Fc region and the insulinotropic peptide, which are linked to each end of the non-peptide polymer.
21. A method for preparing an insulinotropic peptide conjugate, comprising the steps of:
(1) covalently linking a non-peptidyl polymer having an aldehyde reactive group at both ends thereof with the lysine residue of the insulinotropic peptide at pH of 9.0 or more;
(2) isolating a conjugate comprising the insulinotropic peptide from the reaction mixture of (1), in which the non-peptidyl polymer is linked covalently to the lysine residue; and
(3) covalently linking an immunoglobulin Fc region to the other end of the non-peptidyl polymer of the isolated conjugate to produce a protein conjugate comprising the immunoglobulin Fc region and the insulinotropic peptide, which are linked to each end of the non-peptidyl polymer.
22. The method for preparing an insulinotropic peptide conjugate according to claim 20 , wherein the insulinotropic peptide is a deaminated exendin-4.
23. The method for preparing an insulinotropic peptide conjugate according to claim 20 , wherein the non-peptidyl polymer is polyethylene glycol.
24. A pharmaceutical composition comprising the peptide conjugate of claim 1 .
25. A method for treating diabetes, obesity, acute coronary syndrome, or polycystic ovary syndrome comprising administering the peptide conjugate of claim 1 , or the pharmaceutical composition of claim 24 .
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