KR20040086522A - Parathyroid Hormone Conjugated With Biocompatible Polymer with 1:1 complex, Preparation Method Thereof And Pharmaceutical Composition Comprising The Same - Google Patents

Abstract

PURPOSE: Provided are complex of parathyroid hormone(PTH) and biocompatible polymer with 1:1, preparation method thereof and a pharmaceutical composition comprising the same. The complex has improved stability and long half life, and is thus useful as therapeutics. CONSTITUTION: The complex of parathyroid hormone(PTH) and biocompatible polymer with 1:1 is characterized by binding a biocompatible polymer to parathyroid hormone(PTH) with 1:1 through the carboxyl group of PTH. The biocompatible polymer is non immunogenic polymer and the PTH is recombinant human PTH(1-84aa). A pharmaceutical composition comprises a therapeutically effective amount of the complex of PH and biocompatible polymer and pharmaceutically acceptable carrier.

Description

Parathyroid Hormone Conjugated With Biocompatible Polymer with 1: 1 complex, Preparation Method Thereof And Pharmaceutical Composition Comprising The Same}

The present invention relates to a 1: 1 conjugate of a biocompatible polymer and parathyroid hormone (PTH), a preparation method thereof, and a pharmaceutical composition containing the same. More specifically, the present invention relates to conjugates thereof having a 1: 1 binding of a biocompatible polymer such as PEG to a carboxyl group of PTH, a preparation method thereof, and a pharmaceutical composition containing the same.

In general, in the case of using a biologically active substance such as a peptide or protein as a medicine, there is a problem in that the body is easily hydrolyzed or degraded by proteolytic enzymes, thereby lowering the bioabsorption rate or inducing an immune response by repeated administration. For this reason, most protein or peptide drugs are usually administered as injections, and the frequency of administration has been administered once or more a day. Frequent administration of these drugs involves pain and risk to the patient, especially long-term treatment. In case of patients, it causes a lot of inconvenience in daily life and is inefficient in time and economics.

Therefore, the development of a more stable drug to solve the above problems is required, accordingly has been developed a technology for modifying a biologically active material such as peptides or proteins into biocompatible polymers. Coupling proteins or molecules with pharmacological activity with synthetic polymers can provide a number of advantages in in vivo and in vitro applications. For example, covalent bonding of a polymer to a bioactive molecule can alter the surface properties and solubility of the molecule, thereby increasing its solubility in water or organic solvents, and also increasing biocompatibility to improve immune reactivity. Decreases and increases stability in vivo as well as prolongs clearance by the intestinal system, kidney, spleen or liver.

As such, there are many advantages when combining a biocompatible polymer such as PEG with a biologically active material such as a protein or peptide of interest, but there are many known techniques to conjugate a biocompatible polymer conjugated to a biologically active material such as a protein or peptide. If you do, there are some problems to solve. For example, the most common method is that PEG binds to an amine group, such as lysine, where one or more free lysine residues of the protein or peptide to bind to are often close to the active site of the protein and thus the surface of the protein. When a site in the site that is directly related to the activity of the protein binds to PEG, the site is no longer able to perform biological functions, thereby reducing the activity of the protein. In addition, the binding of PEG to lysine residues is a fairly easy reaction, with PEG-biologically active conjugates wherein two or more PEGs are modified into one protein. For example, cytokines such as interferon, CSF, and interleukin, polypeptides such as EGF, hGH, and insulin are dramatically reduced in activity when two or more PEGs are modified on the surface and can no longer play a role. These reactions usually occur randomly and therefore exist as a mixture of many kinds of PEG-protein conjugates, thus making the process of pure separation of the desired conjugates complex and difficult. That is, if too many active polymers are attached to the target protein or peptide, biological activity is significantly reduced or lost, and if a strong linker is used to link the polymer to the protein or if an insufficient amount of polymer is attached to the target, The therapeutic value of the conjugate is rather limited.

In order to overcome this problem, many researchers have attempted to bind a polymer to a converted site by genetically converting an amino acid group of a protein to bind a biopolymer to a specific site. However, this method is genetically altered by a protein, which may be different from the original protein, and there is a problem in demonstrating safety for administration in the human body for treatment.

As an example of an attempt to solve the problem by chemically modifying a specific site of a biologically active substance with biopolymers, US Pat. Nos. 5951974 and 5985263 disclose a method for increasing half-life in the body by covalently binding PEG to histidine residues of interferon. To increase the efficacy of such drugs. However, this method still reacts with active amine groups, and thus, a polymer was randomly conjugated to various regions of histidine, and an ion-exchange column had to be used to separate the PEG-interferon with PEG and interferon 1: 1.

US Patent No. 5766897 modified specific sites by conjugating activated PEG to cysteine residues of bioactive macromolecules and mutants thereof. Most proteins may have one or more free cysteines or form disulfide bonds that do not have extra cysteines. In such a case, the residue is irrelevant to the active site to cysteine through mutation and then the polymer is bound. This method has the advantage that the polymer is conjugated to a specific site, but the activity tends to be considerably inferior to that of other reactors, such as amine groups or carboxyl groups.

U.S. Patent No. 5985265 discloses specific site conjugates that modify PEG to the N-terminal residue of G-CSF or IFN. However, in this method, the active site of the reacting polymer is considerably less reactive, resulting in a longer reaction time, lower yield of the product, and concern for protein stability. In particular, this method, when the active site of the protein is near the N-terminal, the polymer is conjugated to the N-terminal amine group can lead to a drastic decrease or loss of activity.

US Pat. No. 5,824,778 discloses a conjugate in which PEG is bonded to an amine group or carboxyl group of G-CSF. However, in the US patent, the excessive use of EDAC used to activate the carboxyl group of the protein activates the carboxyl group of several residues, thereby binding a plurality of PEGs, and various molecular weight distributions as a result of measuring the molecular weight of the obtained PEG-G-CSF conjugate The conjugate was produced in the form of a heterogeneous mixture of and the protein activity was significantly reduced.

One of the biologically active substances, parathyroid hormone (PTH) is a peptide hormone composed of 84 amino acids secreted from the parathyroid gland. The main action site is the adrenal cortex, which binds to the adrenal cortex and binds to cAMP, IP ₃ (inositol triphosphate), and DAG ( Diacyl glycerol) is a bioactive substance that increases production. Since it is known to promote metabolism and bone formation by controlling homeostasis while maintaining balance of calcium ions in the kidneys and bones, it is an active research material as an agent for treating osteoporosis. PTH binds to and activates the PTH-1 receptor, causing activation of phospholipase C (PLC) as well as adenylate cyclase (AC). Activation of AC through the PTH-1 receptor produces cAMP in the body and PLC activation through the PTH-1 receptor produces PKC and transient intracellular calcium. Estrogen, calcitonin, bisphosphonate, etc., which are used as a treatment for osteoporosis, have a prophylactic effect and inhibit bone absorption, while PTH has osteogenic activity to promote type 2 osteoporosis or advanced osteoporosis with reduced bone remodeling. It is advantageous to the patient. Drugs that promote bone resorption alone are insufficient to increase bone mass in patients with advanced osteoporosis, but PTH, which directly promotes bone formation, is expected to be the first treatment for osteoporosis in a practical sense to restore the density of damaged bone. . PTH is natural or synthetic and its derivatives and homologues are used for the treatment of osteoporosis (Hefti et al., Clinical Science, 62, 389-396 (1982); Liu et al., J. Bone Miner. Res., 6 : 10, 1071-1080 (1991); Hock et al., J. Bone.Min.Res., 7: 1. 65-71 (1992).

As described above, when PTH is used for the treatment of osteoporosis, bone formation and bone mass are known to increase, but PTH is weak in stability, and peptides consisting of 84 amino acids are broken down into fragments consisting of 34 amino acids in vivo after administration. Because of its short half-life (less than 1 hour), there is an inconvenience of frequently administering PTH to increase bone formation and bone mass. Clinically, the effect of PTH therapy requires daily subcutaneous injection, which is a major impediment to the widespread use of PTH.

In an attempt to modify PTH into a polymeric material, US Pat. No. 6,506,730 discloses stability and bioavailability by modifying biocompatible polymers activated by amine groups of biologically active peptides to increase solubility of poorly soluble peptides and to prevent degradation by enzymes in the body. In order to increase mPEG from PEG 5000 and PEG 2000 to protect one hydroxy group of PEG, phosgene and N-hydroxysuccinimide were added to succinyl-N-hydroxysuccinimide ester A method of preparing an SS-PEG (5000, 2000) -PTH (1-34) conjugate is disclosed by activating a (SS-PEG) form and then reacting it with a molar ratio of PTH (1-34) and 5: 1. have. In addition, US Pat. No. 5,342,940 discloses higher purity 2,4-bis-methoxypolyethylene glycol than prior art in order to obtain a homogeneous state in which the polymer-modified protein has minimal antigenicity, long biohalf life and improved tissue transfer. A method for preparing PEG2-modified human PTH (1-34) conjugates by preparing -6-chloro-s-triazine (PEG2) and reacting it with human PTH (1-34) is disclosed. These patents disclose that biocompatible polymers are bound at the N-terminus of PTH and PTH (1-34) of 1-34 amino acids, the active fragments of full-length PTH (1-84), If modification is made at the active site, blocking the active site of PTH may significantly reduce or lose the biological activity of PTH.

Therefore, by binding a biocompatible polymer to PTH at a specific site-specific ratio, the physiological activity of PTH is maintained even after the polymer is bound, and further, if a modified site-specific polymer can be obtained in a homogeneous form, PTH Will greatly contribute to clinical application.

The inventors have prepared PEG-PTH conjugates in which PEG is bonded to PTH at a specific ratio of 1: 1 in carboxyl groups that are less reactive than amine groups, and these conjugates are considerably more stable and longer than native proteins in the body. Since it has a half-life, the efficacy as a therapeutic agent is increased, and it has also been confirmed that PEG exhibits superior properties to conjugates in which the carboxyl group is in excess of 1: 1 and the conjugate conjugated to the amine group.

Therefore, in the present invention, the biocompatible polymer is selectively bonded to the carboxyl group of PTH in a ratio of 1: 1, thereby increasing stability, bioavailability and half-life by the modification of the polymer while maintaining the physiological activity of natural PTH. An object of the present invention is to provide a biocompatible polymer-PTH conjugate, a preparation method thereof, and a pharmaceutical composition containing the same.

1 is a result of performing HPLC on parathyroid hormone (PTH) not modified by a biocompatible polymer.

FIG. 2 shows the results of an HPLC run on the reaction mixture (unreacted PTH, mPEG-HZ (20000) -PTH, mPEG-HZ (20000)) before reacting PEG-hydrazide (HZ) (20000) with PTH. (Peak 1: PTH not modified with polymeric PEG derivative, Peak 2: PEG-HZ (20000) -PTH)

3 is a result of HPLC execution after the reaction of PEG-HZ (20000) with PTH and final purification of PEG-HZ (20000) -PTH.

4 is a result of staining with Coomassie blue after performing SDS-PAGE by reacting PEG-HZ (20000) with PTH (lane 1: size marker; lane 2: PTH; lane 3: PTH, PEG-PTH (Before purification); Lane 4: PEG-HZ (20000) -PTH) (after purification).

5 is a comparison of the biological activity of PTH and PEG-PTH in vitro.

Fig. 6 is a comparison of half-life in vitro of PTH and PEG-PTH.

In one aspect, the present invention relates to a biocompatible polymer-PTH conjugate, wherein the biocompatible polymer is bound to PTH at a ratio of 1: 1 through the carboxyl moiety of PTH.

In one aspect, the present invention relates to a pharmaceutical composition comprising a therapeutically effective amount of the biocompatible polymer-PTH conjugate and a pharmaceutically acceptable carrier.

In one aspect, the present invention provides a PTH, an activated biocompatible polymer and a carboxyl coupling agent, wherein the molar ratio of PTH to activated biocompatible polymer is from 1: 1 to 20, and the molar ratio of PTH to coupling agent is from 1: 1 to 50. , Wherein the pH of the reactant is combined under a reaction condition of 2 to 5, wherein the biocompatible polymer is bound to PTH at a ratio of 1: 1 through the carboxyl moiety of PTH. It relates to a manufacturing method. In this process, the coupling agent, for example EDAC, is unstable and hydrolyzed in aqueous solution, so it is added several times, preferably at least five times, more preferably five or six times, rather than one addition.

By the above method, the conjugate | zygote which the biocompatible polymer couple | bonded with the carboxyl group of PTH in 1: 1 ratio is obtained. That is, the present invention selectively binds the polymer modifier activated by the reactive group to the carboxyl moiety of PTH substantially in a ratio of 1: 1, thereby blocking the active site by binding to the moiety involved in the biological activity of PTH. This prevents problems such as loss or reduction of PTH activity and avoids formation of a mixture of heterogeneous conjugates of various kinds by random binding to a plurality of reactive moieties of an active site, thereby avoiding a 1: 1 ratio of biocompatible polymer-PTH. It is possible to obtain a conjugate. Furthermore, the conjugates of the present invention have the advantage that the stability in vivo is increased by the various properties imparted by the biocompatible polymer, thereby increasing the bioavailability and the bio-half life. Thus, the production time and cost is shortened and economical compared to the prior art in which a heterogeneous mixture is produced due to the production of a homogeneous biocompatible polymer-PTH conjugate.

International Patent No. WO92 / 16555 discloses binding PEG-hydrazide (Hz) or PEG-hydrazide spacerd with amino acid residues to a sugar site or carboxyl group of ovalbumin, but the patent is directed to a number of biologically active substances. It only describes the binding of PEG to the manufacture of biocompatible polymers and PTH conjugates in a 1: 1 ratio, and there is no mention of their activity.

In general, the specific reaction using pKa according to amino acids, but it is difficult to control the number of polymers bound to a specific site is difficult to apply practically. When reacting an amine group with the pH of the reactant at 7-8, it simultaneously reacts with the lysine residues simultaneously with the histidine residues. Under this background, we have found that PEG binds 1: 1 at the carboxyl group of the PTH, especially at the C-terminus, when the reaction pH of the reactants is adjusted to 3 or less in the method of the conjugate as described above.

Thus, in one aspect, the present invention relates to a biocompatible polymer-PTH conjugate, wherein the biocompatible polymer is bound at a C-terminus of PTH at a ratio of 1: 1.

In another aspect, the present invention relates to a pharmaceutical composition comprising a therapeutically effective amount of a biocompatible polymer-PTH conjugate 1: 1 bound at the C-terminus as described above and a pharmaceutically acceptable carrier.

In another embodiment, the present invention provides a PTH, an activated biocompatible polymer and a carboxyl coupling agent, wherein the molar ratio of PTH to activated biocompatible polymer is from 1: 1 to 20, and the molar ratio of PTH to coupling agent is from 1: 1 to 1. 50, a biocompatible polymer-PTH conjugate in which a biocompatible polymer is bound at a ratio of 1: 1 with PTH via a carboxyl moiety of the PTH, wherein the pH of the reactant includes binding under a reaction condition of 2-3. It relates to a manufacturing method of.

Biocompatible Polymer

"Formula" used in the modification of the PTH in the present invention refers to all biocompatible polymers useful for the human body that can be added to PTH, such as natural or artificial synthetic polymer materials.

As used herein, the term "biocompatibility" is harmless to a living body without causing a toxic response, an inflammatory response, an immune response, a carcinogenicity, etc., and has a good affinity with a living tissue or a biological system without causing an immunological rejection. The ability to be compatible with.

It is a biocompatible polymer that binds to PTH to form a conjugate. Biocompatible polymeric materials useful for the human body that can be used in the present invention are readily soluble in various solvents and have a number average molecular weight of preferably about 300 Daltons to about 100,000 Daltons, more preferably about 2,000 Daltons to about 40,000 Daltons. As biocompatible polymers, for example, polyethylene glycol, polypropylene glycol, polyoxyethylene, polytrimethylene glycol, polylactic acid and derivatives thereof, polyacrylic acid and derivatives thereof, polyamino acid, polyvinyl alcohol, polyurethane, polyphosphazine Non-immunogenic polymeric materials selected from the group consisting of poly (L-lysine), polyalkylene oxide, polysaccharides, dextran, polyvinyl pyrrolidone, polyacrylamide and two or more copolymers thereof It is not limited.

The biocompatible polymer of the present invention is intended to include not only linear polymers but also the following polymers. Biocompatible polymers of the present invention include water-soluble non-antigenic polymers bound to an activating functional group capable of performing nucleophilic substitution via aliphatic linkage residues, as described in US Pat. Nos. 5,643,575 and 5,919,455. do. In addition, the biocompatible polymers of the present invention may be activated to attach to biologically active molecules such as two linker fragments, proteins, etc., each having a polymer arm at the central carbon atom, as described in US Pat. No. 5,932,462. Multi-armed, monofunctional and hydrolytically stable polymers having residues which may be, and side chains which may be hydrogen or methyl groups or another linker fragment. In addition, the biocompatible polymer of the present invention includes a branched PEG polymer in which a functional moiety such as PEG is bound to a biologically active molecule via a linker arm having a reporter moiety, as described in WO 00/33881. Included.

PEG is one of the representative materials of the biocompatible polymer of the present invention. PEG is a water-soluble, non-toxic polymer with a repeating structure of HO-(-CH ₂ CH ₂ O-)-H. It is known. The molecular weight of PEG bound to a biologically active substance such as a peptide or protein is approximately 1,000 to 100,000, and when the molecular weight of PEG is 1,000 or more, toxicity is known to be quite low. PEGs in the molecular weight range of 1,000 to 6,000 are distributed throughout the body and metabolized through the kidneys, in particular branched PEGs having a molecular weight of 40,000 are distributed in organs including blood and liver and metabolism in the liver.

Commercially available molecular weights vary, the oxyethylene backbone has hydrophilic properties that allow 2-3 water molecules to bind to each unit, and it is easy to synthesize derivatives having a single functional group from methoxy polyethylene glycol. PEG is the most preferred biocompatible polymer modifier because it has a low risk of causing an antibody response and many related technologies have been developed.

Parathyroid hormone (PTH)

PTH is a series of preproPTH consisting of 115 amino acids produced in the parathyroid gland cells, cut through the endoplasmic reticulum and transformed into peptide proPTH (92 amino acids), which is then cleaved again through the Golgi organs to mature PTH consisting of 84 amino acids. It is a polypeptide hormone synthesized through the process, and its main action site is the adrenal cortex, which binds to the adrenal cortex and increases the production of cAMP, IP ₃ (inositol triphosphate) and DAG (diacyl glycerol). Mammalian parathyroid hormones such as human, bovine and swine parathyroid hormones (hPTH, bPTH, pPTH) are polypeptides of approximately 9500 Daltons in molecular weight and consisting of 84 amino acid residues. The N-terminal fragment of human PTH differs from the N-terminal fragments of the hormones of bovine and swine only three and two amino acid residues, respectively. The biological activity of PTH is associated with the N-terminal site, and PTH has been reported to have similar activity, as well as full-length peptides of (1-84 aa) as well as N-terminal fragments. This activity seems to require at least residues (1-34). For this reason, PTH has been reported to develop full-length peptides and their fragments as therapeutic agents, and to promote bone formation when PTH is administered externally in small amounts (Tam, CS et al., Endocrinology, 110: 506). -512 (1982). This bone formation promoting function is the basis for using PTH as a therapeutic agent for osteoporosis. For example, a treatment for osteoporosis using human PTH (34 aa) as an active ingredient is a product sold under the name Forteo by Eli Lilly and Co., and NPS Pharmaceutical uses PTH (84 aa) recombined from yeast. It is known that a therapeutic agent for osteoporosis as an ingredient is in the phase 3 clinical trial.

PTH used according to the invention is preferably human PTH, more preferably human PTH (1-84 aa) consisting of 84 amino acids.

PTH used in the present invention includes fragments and variants thereof, homologues and homologues thereof, and physiologically active salts thereof that retain the biological activity or at least part thereof of the native PTH. PTH is natural or synthesized by recombinant nucleic acid techniques, such as human, animal origin, for example PTH, synthetic homologues of PTH related peptides (PTHrp), or truncated homologues or homologues with physiological activity of PTH or PTHrp Or salts thereof.

The PTHrp, a peptide homologue of PTH that is known to have PTH-like activity, has recently been discovered. Human PTHrp is a peptide consisting of 141 amino acids that is similar to PTH in biological activity, namely increased calcium content in blood, promoting bone resorption, Recently, there have been reports of a decrease in phosphorus content in blood, a decrease in calcium content in urine, an increase in cAMP content in urine and activation in the kidney of the hydroxyl enzyme at position 1 of vitamin D (Horiuchi, et al., Science, Vol. 238, 1988; Kemp, et al., Science, Vol. 238, 1988). Such homologues may have different functions than natural PTH, or may have the same function or the same function to varying degrees. For example, homologues can be designed to have higher or lower biological activity.

Homologs of PTH include those having sequence identity of at least 70 to 95%, preferably 80 to 90%, more preferably 90 to 95% with the full length peptide. PTH can be obtained from a variety of sources, including humans, animals, and the like, and can be variously modified by deletion, insertion, substitution, etc., of one or more amino acid residues without affecting biological activity by genetic engineering processing and It can also be produced on a commercial scale using conventional recombinant DNA techniques.

PTH also improves half-life, changes in bioactivity (eg, enzymatic properties, dissociated bioactivity or activity in organic solvents), decreases toxicity, changes in immunoreactivity (eg, reduced immunogenicity) , Reduced antigenicity) or chemically modified for physical properties (eg, increased solubility, improved thermal stability, improved mechanical stability, or structural stabilization).

Recombinant PTH produced from recombinant yeast may also be used as the PTH of the present invention. Human PTH can be produced, for example, by the method disclosed in Korean Patent Laid-Open No. 2002-0017754 (Dongkuk Medicine). PTH can also be prepared, for example, by the method disclosed in European Patent Publication No. 0383751, in addition to various methods of preparing PTH (Erickson and Merrifield, The Proteins, Neurath et al., Eds., Academic Press, New York, 1976, page 257, Hodges et al .: Hodges et al (1988), Peptide Research 1, 19, Atherton et al .: Atherton, E. And Sheppard, RC Solid Phase Peptide Synthesis, IRL Press, Oxford, 1989).

Method for preparing biocompatible polymer-PTH conjugate

Generally, in the preparation of biologically active conjugates, one process converts one of the end groups into a reactive functional group to bind the biocompatible polymer to PTH, which is called "activation" and the product resulting from this process is "activated biocompatibility." Polymer ". For example, to bind a poly (alkylene oxide) to a peptide or protein, one of the hydroxyl end groups can be converted into a reactive functional group such as carbonate and the resulting product is an activated poly that is water soluble at room temperature. (Alkylene oxide) (PAO). Such groups include monosubstituted polyalkylene oxide derivatives such as mPEG or other suitable alkyl-substituted PAO derivatives such as those containing C _1-4 terminal groups.

As used herein, "reactive functional group" refers to a group or moiety that activates a biocompatible polymer to bind to the desired PTH.

Reactive functional groups that can be used in the present invention include carboxylic acids and the like, such as primary amines, or hydrazine and hydrazide functional groups (acyl hydrazide, carbazate, semicarbazate, thiocarbazate, etc.). It may be selected from functional groups capable of reacting with reactive carbonyl groups.

As used herein, “coupling agent of carboxyl group” (hereinafter referred to as “coupling agent”) means an agent that couples a carboxyl group of a bioactive substance such as a protein that is bound to a biocompatible polymer activated with the reactive functional group. .

The coupling agent of the carboxyl group which can be used in the present invention is not limited thereto, but a carbodiimide-based coupling agent such as EDAC [N- (3-dimethylaminopropyl) -N'-ethylcarbodiimide hydro Chloride], DIC [1,3-diisopropylcarbodiimide], DCC [dicyclohexyl carbodiimide], EDC [1-ethyl-3- (3-dimethylaminopropyl) -carbodiimide], and the like. Include. Preferred carboxyl coupling agent is EDAC.

Methods for preparing biologically active conjugates include contacting PTH capable of a substitution reaction with the activated biocompatible polymer under conditions sufficient to allow binding while maintaining at least some of the intrinsic activity of the desired PTH.

A conjugate of biocompatible polymers bound to PTH in a ratio of 1: 1 can be obtained by reacting a stoichiometric excess of polymer with PTH. For example, in the preparation of protein-polymers, peptide-polymers, enzyme-polymers, antibody-polymers and drug-polymer conjugates, the molar ratio of PTH to activated biocompatible polymer is about 1: 1 to 1:20, more preferably Preferably 1: 1 to 1:10. In addition, the material used to activate the carboxyl group of PTH is not limited to the following examples, but may be selected and used from the following groups. For example, water-soluble carbodies such as N- (3-dimethylaminopropyl) -N'-ethylcarbodiimide hydrochloride (EDAC), 3- [2-morpholinyl- (4) -ethyl] carbodiimide Mid-substituted groups, p-toluene sulfonate, 5-substituted isoxazolinium salts such as Woodward's Reagent K, and the like.

In the present invention, the EDAC used in the preparation of the biocompatible polymer-PTH conjugate modified with a carboxyl group has a molar ratio of PTH to EDAC of about 1: 1 to 1:50, and more preferably 1: 1 to 1:30. And 1: 1 to 1:20 are most preferred. However, when EDAC is in solution, it tends to hydrolyze rapidly, so adding 20 times EDAC at a time significantly lowers the reactivity, so when added more than 5 times, preferably 5-6 times, PEG-PTH conjugate Formation is increased.

PTH can react with pH-activated polymers in buffered aqueous mediums. Generally, considering the protein / polypeptide material, the pH in the reaction is about 2 to about 5, preferably about 2.5 to 4.5. Optimum reaction conditions for the stabilization and reaction efficiency of these materials are well known to those skilled in the art. Preferable temperature range is 0-60 degreeC, More preferably, it is 4-30 degreeC. The temperature of the reaction medium should not exceed the temperature at which PTH may denature or decompose. It is preferable to make reaction time into 10 minutes-5 hours. The biologically active conjugate formed can be recovered and purified by using column chromatography, diafiltration or a combination of the above methods.

Pharmaceutical composition

The present invention also relates to pharmaceutical compositions comprising a therapeutically effective amount of the activated biocompatible polymer-PTH conjugate of the present invention as an active ingredient.

The term "pharmaceutically acceptable" is used herein to refer to a molecule or composition that, when administered to a human, does not cause an allergic reaction or similar unwieldy reactions.

As the active ingredient used in the pharmaceutical composition of the present invention, the biocompatible polymer-PTH conjugate may be used as a prophylactic and therapeutic agent or in a form formulated by mixing with a pharmaceutically acceptable carrier.

The term "pharmaceutically acceptable carrier" refers to a pharmaceutically acceptable substance such as a liquid or solid filler, diluent, excipient or solvent which serves to transport the active ingredient from one organ or part of the body to another organ or part of the body. , Composition or vehicle.

The pharmaceutical compositions of the invention can be administered via oral, topical, injection or parenteral routes, and these formulations generally contain a therapeutically effective amount of the biocompatible polymer-PTH conjugate of the invention as the active ingredient. Formulations for oral administration according to the invention are, for example, pills, tablets, racked tablets, tablets, powders, granules, troches, wafers, elixirs, hard and soft gelatin capsules, solutions, syrups, emulsions, suspensions It may be administered in the form of a formulation, or a spray mixture, and the preparation for parenteral administration may include, for example, injection, microcapsules, transdermal and the like.

Pharmaceutical formulations can be prepared by known methods using pharmaceutically acceptable inert inorganic or organic excipients. For example, lactose or corn starch or derivatives thereof, talc, stearic acid or its salts and the like can be used to prepare pills, tablets, coated tablets, hard gelatin capsules and the like. Excipients for soft gelatin capsules and suppositories are, for example, fats, waxes, semisolid and liquid polyols, natural or solidified oils and the like. Suitable excipients used in the preparation of solutions and syrups are, for example, water, sucrose, invert sugar, glucose, polyols and the like. Suitable excipients for the preparation of injectable solutions include water, alcohols, glycerol, polyols, vegetable oils and the like. Injectables can also be used in combination with preservatives, analgesics, solubilizers and stabilizers. In the case of formulations for topical administration, it may be prepared by mixing a gas, an excipient, a lubricant and a preservative. Suitable excipients for microcapsules or implants include copolymers or glycolic acid and lactic acid.

The dosage of the biocompatible polymer-PTH conjugate according to the present invention may be appropriately selected depending on the absorbency, solubility of the active ingredient in the body, the age, sex, condition of the patient and the severity of the disease to be treated. In particular, the administration of the biocompatible polymer-PTH conjugate according to the present invention significantly reduces the number of conventional injections for therapeutic treatment once or several times or once a day to once or twice a week, and thus, frequent administration. Reduce drug toxicity and side effects.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, these examples are merely illustrative of the present invention, and the present invention is not limited thereto.

Example

Example 1 Preparation of Parathyroid Hormone

Yeast Saccharomyces cerevisiae fragmented with YPS1, YPS2, YPS3 genes encoding the yeast aspartic protease family of Apsin 1, Apsin 2, Apsin 3 described in Korean Patent Publication No. 10-2002-0017754 ) Strain was used to prepare human parathyroid hormone.

10 ml of agar-free colonies obtained by culturing the strain on YNBCAD (0.67% yeast nitrogen substrate without amino acid, 2% glucose, 0.5% casamino acid, 1.5% agar) and incubating at 30 ° C for 24 hours. Was inoculated in YNBCAD liquid medium and primary cultured at 30 ° C. for 15 hours, followed by secondary flask culture for 15 hours in 100 ml of YNBCAD liquid medium. This was used as a seed for fed-batch culture. The working volume is 2 L in a 5 L fermenter, and the medium composition for fermentation is 2% glucose, 4% yeast extract, 0.5% cassanoic acid, and 0.1% potassium phosphate. / L and galactose 400 g / L was used. Secondary culture medium (100 ml) was inoculated into 2 L of the working volume including the medium composition. After 12 hours of incubation, glucose was consumed, and ethanol and galactose were added. Thereafter, each time the pH and dissolved oxygen were raised, 20 g / L ethanol and 10 g / L galactose were intermittently supplied. The culture temperature and pH were maintained at 30 ° C. and 5.5, respectively, and the fermentation termination point was terminated after 40 to 45 hours after the seed culture inoculation.

About 2000 ml of the fermentation supernatant obtained by centrifugation of the fermentation-completed culture was filtered through a 0.2 μm filter, followed by ultrafiltration. 1500 ml of a filtrate having a molecular weight of 50 kDa or less that passed through an ultrafiltration membrane having a molecular weight cut off (MWCO) of 50 kDa was further concentrated to 300 ml using an ultrafiltration membrane having a MWCO 3 kDa. 50 mM acetate buffer, pH 5.5 was added to the concentrated fermentation broth, and the concentrated fermentation broth was washed with ultrafiltration. The solution thus concentrated and washed by ultrafiltration was used as a sample of ion exchange chromatography.

A glass column (1.1 cm × 25 cm, Amicon, USA) was charged with 20 ml of SP-Sepharose (Pharmacia, Sweden) and the column was washed until equilibrated with 50 mM acetate buffer, pH 5.5. After equilibration, the sample concentrated by ultrafiltration was loaded onto the column and washed again with 50 mM acetate buffer, pH 5.5 to remove material not bound to the column. Elution of PTH was performed by increasing the concentration of NaCl from 0 N to 0.8 N for 120 minutes using 50 mM acetate, 1N NaCl, pH 5.5 when washing to reach equilibrium again. Every 2 minutes, the solution that passed through the column was collected and the portion corresponding to each peak was analyzed by electrophoresis. After analysis, the parts containing hPTH were collected and lyophilized. The sample obtained after lyophilization was dissolved in distilled water, and then purified by PTH using RP-HPLC. Analysis and purification conditions using RP-HPLC were as follows: Hypersil BDS (4.6 mm × 15 cm) C18 column was used and the mobile phase was separated by concentration gradient using acetonitrile / 0.1% TFA and water / 0.1% TFA. It was. The detection wavelength was 215 nm and the flow rate was 1 ml / min. For preparative HPLC, the column was Vydac C18 (1.0 × 25 cm) and all the experimental conditions except the flow rate (4 ml / min) were the same as for the analysis. After freeze-drying, the PTH fraction dissolved in distilled water was loaded on a column, and the fractions corresponding to PTH were collected to purify hPTH. Analysis of hPTH obtained after purification yielded high purity (> 99%) hPTH.

Example 2 Preparation of PEG-HZ (5000) -PTH

1 mg of human parathyroid hormone prepared in Example 1 (0.000119 mmol, Humanparathyroid hormone, PTH) and 3.0 mg of activated mPEG (5000) -hydrazide (0.0006 mmol, Iw Chem, Korea) were prepared at 50 mM of pH 4.4. 0.5 ml of MES (2- (N-morpholino) ethanesulfonic acid) buffer was added and stirred at room temperature for 10 minutes. 2.5 µl (0.00125 mmol, 10-fold) of EDAC (N- (3-dimethylaminopropyl) -N'-ethylcarbodiimide hydrochloride) prepared at a concentration of 100 µg / µl was added and reacted at room temperature for 1 hour. . 0.4 mg of mPEG-HZ (5000) -PTH was obtained by removing large amounts of unreacted mPEG and PTH using Centricon-10 (Amicon, USA).

Example 3 Preparation of mPEG-HZ (12000) -PTH

1 mg of human parathyroid hormone (0.00012 mmol) and 7.14 mg of activated mPEG (12000) -hydrazide (0.0006 mmol, 5-fold, Isuchem, Korea) were added to 50 mM MES (2- (N-mo) at pH 4.4. 0.5 ml of polyno) ethanesulfonic acid) buffer was added and stirred at room temperature for 10 minutes. 2.5 µl (0.00125 mmol, 10-fold) of EDAC (N- (3-dimethylaminopropyl) -N'-ethylcarbodiimide hydrochloride) prepared in advance at a concentration of 100 µg / µl was added and reacted at room temperature for 1 hour. . 0.3 mg of mPEG-HZ (12000) -PTH was obtained by removing a large amount of unreacted mPEG and PTH using Centricon-10 (Amicon, USA).

Example 4 Preparation of mPEG-HZ (20000) -PTH

1 mg of human parathyroid hormone (0.00012 mmol) and 12 mg of activated mPEG (20000) -hydrazide (0.0006 mmol, 5-fold) were added to 50 mM MES (2- (N-morpholino) ethanesulphate at pH 4.4. Phonic acid) buffer was added to 0.5 ml and stirred at room temperature for 10 minutes. 2.5 µl (0.00125 mmol, 10-fold) of EDAC (N- (3-dimethylaminopropyl) -N'-ethylcarbodiimide hydrochloride) prepared in advance at a concentration of 100 µg / µl was added and reacted at room temperature for 1 hour. . 0.3 mg of mPEG-HZ (20000) -PTH was obtained by removing large amounts of unreacted mPEG and PTH using Centricon-30 (Amicon, USA).

Example 5 Preparation of mPEG-HZ (12000) -PTH

1 mg of human parathyroid hormone (0.00012 mmol) and 14.4 mg of activated mPEG (12000) -hydrazide (0.0012 mmol, 10-fold, Isuchem, Korea) were added to 50 mM MES (2- (N-mo) at pH 2.5. 0.5 ml of polyno) ethanesulfonic acid) buffer was added and stirred at room temperature for 10 minutes. 5 μl (0.0025 mmol, 20-fold) of EDAC (N- (3-dimethylaminopropyl) -N'-ethylcarbodiimide hydrochloride) prepared in advance at a concentration of 100 μg / μl was added and reacted at room temperature for 1 hour. . 0.2 mg of mPEG-HZ (12000) -PTH was obtained by removing large amounts of unreacted mPEG and PTH using Centricon-10 (Amicon, USA).

Example 6 Preparation of mPEG-HZ (20000) -PTH

1 mg of human parathyroid hormone (0.00012 mmol) and 24 mg of activated mPEG (20000) -hydrazide (0.0012 mmol, 10-fold) were added to 50 mM MES (2- (N-morpholino) ethanesulphate at pH 2.5. Phonic acid) buffer was added to 0.5 ml and stirred at room temperature for 10 minutes. 5 μl (0.0025 mmol, 20-fold) of EDAC (N- (3-dimethylaminopropyl) -N'-ethylcarbodiimide hydrochloride) prepared in advance at a concentration of 100 μg / μl was added and reacted at room temperature for 1 hour. . 0.2 mg of mPEG-HZ (12000)-PTH was obtained by removing large amounts of unreacted mPEG and PTH using Centricon-10 (Amicon, USA).

Example 7 Analysis of mPEG-HZ-PTH Conjugates

PEG-PTH conjugate, PTH, obtained in the above examples was determined according to the following HPLC conditions:

1. HPLC conditions

Column: LiChroCART 125-4 RP-8 (5 μm) (MERK)

Solvent: A: deionized water B: acetonitrile; gradient

Flow rate: 0.8 ml / min

Detector (UV): 220 nm

Injection volume: 20 μl

number Time (min) A (%) B (%) Flow rate (ml / min) One 0.00 70.0 30.0 0.800 2 3.00 70.0 30.0 0.800 3 13.00 10.0 90.0 0.800 4 15.00 10.0 90.0 0.800 5 17.00 70.0 30.0 0.800 6 20.00 70.0 30.0 0.800

LiChroCART 125-4 RP-8 (5 μm) used in the HPLC column does not detect any PEG on the chromatograph but only PTH or other proteins.

Retention time (RT value) on HPLC of PTH was measured. As a result of HPLC of PTH unmodified by the polymer derivative, it can be seen that the peak of PTH sharply decreases after peaking at about 6.8 minutes, and then gradually increases to about 18 minutes (FIG. 1).

In the mPEG-PTH product prepared in the above example, peaks of unmodified PTH (6.8 components) and PEG-PTH (7.3 components) were detected in the concentration gradients corresponding to Nos. 1 and 2 in Table 1 above.

mPEG-HZ (20000) There are 3 kinds of modified reaction mixtures (unreacted PTH, mPEG-HZ (20000) -PTH, mPEG-HZ (20000)) before purification. 20000) shows that only two species (unreacted PTH, mPEG-HZ (20000) -PTH) were detected without HPLC (FIG. 2). The chromatograph when mPEG-HZ (20000) -PTH was finally purified was shown in FIG. 3, and SDS-PAGE was performed by reacting mPEG-HZ (20000) with PTH. Respectively.

Example 8 Measurement of In Vitro Biological Activity

Activated PEG-HZ with molecular weight of 5000 (5K), 12000 (12K), and 20000 (20K) was used to measure the biological activity according to the molecular weight of PEG. Pharmacia, RPN 225) was used to measure the in vitro biological activity of native PTH, PEG-PTH (5K), PEG-PTH (12K), PEG-PTH (20K). PEG-PTH activity tended to decrease with higher molecular weight of PEG, compared to unmodified PTH when compared to 10-8 mol, PEG-PTH (5K), PEG-PTH (12K), PEG-PTH (20K). ) Has a biological activity of about 40%, 30%, 20% respectively (Fig. 5).

Example 9 Comparison of Half-Life in Vivo According to PEG Molecular Weight

Unmodified PTH and PEG-PTH were administered intravenously to SD (Spraugue-Dawley) male rats (300-350 g body weight) at a concentration of 100 μg / kg, followed by 0, 5, 10, 15, 30, 60, Blood was collected at 120 minutes and centrifuged at 10,000 rpm for 10 minutes to separate plasma. Subsequently, the half-life of PEG-PTH was determined indirectly by measuring the residual PTH concentration by measuring the cAMP concentration remaining in plasma using a cAMP assay kit (Amersham Pharmacia, RPN 225).

Unmodified PTH and PEG-PTH (5K) remained little within 15 minutes after administration, while PEG-PTH (12K) and PEG-PTH (20K) remained up to about 1 hour and 2 hours, respectively (Figure 6). .

From the above description, those skilled in the art can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. In this regard, it should be understood that the examples and experimental examples described above are exemplary in all respects and not restrictive. The scope of the present invention should be construed that all changes or modifications derived from the meaning and scope of the following claims and equivalent concepts thereof are included in the scope of the present invention rather than the foregoing detailed description.

According to the present invention, a biocompatible polymer-PTH conjugate and a method for preparing the same are provided, wherein the biocompatible polymer is bonded at a carboxyl group of PTH such as a protein or a peptide to PTH in a molar ratio of 1: 1. When used as a therapeutic agent, the number of drug administrations can be significantly reduced due to an increase in in vivo half-life and bioavailability due to an increase in the in vivo stability of the drug.

Claims (18)

A biocompatible polymer-PTH conjugate, wherein the biocompatible polymer is bound to PTH in a ratio of 1: 1 through the carboxyl site of parathyroid hormone (PTH). The method of claim 1, wherein the biocompatible polymer is polyethylene glycol, polypropylene glycol, polyoxyethylene, polytrimethylene glycol, polylactic acid and derivatives thereof, polyacrylic acid and derivatives thereof, poly (amino acid), polyurethane, polyphosphazine , Non-immunogenic polymers selected from the group consisting of poly (L-lysine), polyalkylene oxides, polysaccharides, dextran, polyvinyl pyrrolidone, polyvinyl alcohol and polyacrylamide and two or more copolymers thereof Phosphorus conjugate. The conjugate of claim 1, wherein the PTH is recombinant human PTH (1-84 aa). A pharmaceutical composition comprising a therapeutically effective amount of the biocompatible polymer-PTH conjugate according to claim 1 and a pharmaceutically acceptable carrier. PTH, activated biocompatible polymer and carboxyl coupling agent, the molar ratio of PTH to activated biocompatible polymer is 1: 1-20, the pH of the reactants is 2-5, the molar ratio of PTH and coupling agent is 1: 1. The biocompatible polymer is a biocompatible polymer, wherein the biocompatible polymer is bonded at a ratio of 1: 1 with PTH through the carboxyl moiety of the PTH. -PTH conjugate preparation method. 6. The method of claim 5 wherein the biocompatible polymer is activated with a functional group capable of reacting with carboxylic acid and reactive carbonyl groups. 6. The biocompatible polymer of claim 5 wherein the biocompatible polymer is polyethylene glycol, polypropylene glycol, polyoxyethylene, polytrimethylene glycol, polylactic acid and derivatives thereof, polyacrylic acid and derivatives thereof, poly (amino acids), polyurethanes, polyphosphazines. , Non-immunogenic polymers selected from the group consisting of poly (L-lysine), polyalkylene oxides, polysaccharides, dextran, polyvinyl pyrrolidone, polyvinyl alcohol and polyacrylamide and two or more copolymers thereof How to be. 6. The method of claim 5, wherein the PTH is recombinant human PTH (1-84 aa). The biocompatible polymer-PTH conjugate obtained by the method of claim 5, wherein the biocompatible polymer is bound to PTH in a ratio of 1: 1 through the carboxyl moiety of PTH. Biocompatible polymer-PTH conjugate, characterized in that the biocompatible polymer is bonded to the PTH in a ratio of 1: 1 through the C-terminal portion of the PTH. 11. The biocompatible polymer of claim 10 wherein the biocompatible polymer is polyethylene glycol, polypropylene glycol, polyoxyethylene, polytrimethylene glycol, polylactic acid and derivatives thereof, polyacrylic acid and derivatives thereof, poly (amino acids), polyurethanes, polyphosphazines. , Non-immunogenic polymers selected from the group consisting of poly (L-lysine), polyalkylene oxides, polysaccharides, dextran, polyvinyl pyrrolidone, polyvinyl alcohol and polyacrylamide and two or more copolymers thereof Phosphorus conjugate. The conjugate of claim 10, wherein the PTH is recombinant human PTH (1-84 aa). A pharmaceutical composition comprising a therapeutically effective amount of the biocompatible polymer-PTH conjugate according to claim 10 and a pharmaceutically acceptable carrier. PTH, activated biocompatible polymer and carboxyl coupling agent, the molar ratio of PTH to activated biocompatible polymer is 1: 1 to 20, the pH of the reactants is 2-3, the molar ratio of PTH to coupling agent is 1: 1. The biocompatible polymer is bound to the PTH at a ratio of 1: 1 with the PTH through the C-terminal portion of the PTH. Method for preparing a conformable polymer-PTH conjugate. 15. The method of claim 14, wherein the biocompatible polymer is activated with a functional group capable of reacting with carboxylic acid and reactive carbonyl groups. The method of claim 14, wherein the biocompatible polymer is polyethylene glycol, polypropylene glycol, polyoxyethylene, polytrimethylene glycol, polylactic acid and derivatives thereof, polyacrylic acid and derivatives thereof, poly (amino acid), polyurethane, polyphosphazine , Non-immunogenic polymers selected from the group consisting of poly (L-lysine), polyalkylene oxides, polysaccharides, dextran, polyvinyl pyrrolidone, polyvinyl alcohol and polyacrylamide and two or more copolymers thereof How to be. The method of claim 14, wherein the PTH is recombinant human PTH (1-84 aa). The biocompatible polymer-PTH conjugate obtained by the method of claim 14, wherein the biocompatible polymer is bound to PTH in a ratio of 1: 1 through the C-terminal portion of PTH.