WO2012165682A1

WO2012165682A1 - Bone forming peptide 4 for promoting osteogenesis or vascularization and use thereof

Info

Publication number: WO2012165682A1
Application number: PCT/KR2011/004104
Authority: WO
Inventors: Taek Rim Yoon; Hyung Keun Kim; Ji Hyun Kim
Original assignee: Industry Foundation Of Chonnam National University
Priority date: 2011-05-27
Filing date: 2011-06-03
Publication date: 2012-12-06

Abstract

A peptide for promoting osteogenesis and vascularization, and the use of the peptide. The peptide has a low molecular weight so that it can be produced economically. In addition, it promotes osteoblastic differentiation, thus inducing osteogenesis. Further, the peptide can promote the expression of VEGF, resulting in vascularization.

Description

BONE FORMING PEPTIDE 4 FOR PROMOTING OSTEOGENESIS OR VASCULARIZATION AND USE THEREOF

The present invention relates to a peptide useful for promoting osteogenesis or vascularization and the use thereof.

Bones constitute part of the endoskeleton which physically support the body, and play an important role in the maintenance of the blood calcium level. In a normal state, bones show a dynamic homeostasis in which both bone resorption and formation actively proceed in metabolic balance. The disruption of the balance between bone resorption and formation with a shift towards bone resorption cause a decrease in bone mineral density or bone mass and bone strength, leading to osteoporosis.

Osteoporosis is a disease of bone characterized by a high risk of fracture upon receiving just a slight impact as a result of weakened bones. Other representatives of bone diseases are osteoarthritis and bone defects. Osteoarthritis, also known as degenerative arthritis, is characterized by a local degenerative change in the joint as a result of the breakdown and loss of cartilage. Bone defects may form in many sites of the body, predominantly because of acute trauma accompanied by bone matrix loss, acute trauma accompanied by surgical bone loss, chronic infection accompanied by bone resection, and chronic nonunion accompanied by segmental defect.

The market relating to bone diseases around the world amounts to approximately 130 billion dollars, and its size is expected to continuously expand. Thus, research institutes and pharmaceutical companies have made a tremendous investment in the development of medicines for bone diseases.

Medicines currently used for osteoporosis include bisphosphonates (allendronate, etidronate, etc.), hormonal agents (raloxifene), vitamin D agents, calcitonin agents and calcium agents. Recently, the parathyroid hormone agent Forteo^TM has been commercially available and has an ability to form new bones.

However, bisphosphonates have a problem associated with the uptake thereof in that because they are absorbed at a very low rate and cause erosions of the esophagus, the patients must take them together with a sufficient amount of water and sit upright for a time after the uptake of the medication. Hormonal agents are required to be taken for the life of the patients and the administration thereof over the long term may cause side effects such as breast cancer, uterine cancer, and thrombosis. Vitamin D agents are very expensive, but their pharmaceutical efficacy is not reliable. Calcitonin agents are also expensive and have a problem associated with the administration thereof. Calcium agents do not cause significant side effects, but are limited to prophylactic effects rather than therapeutic effects.

Forteo^TM, a recently commercialized parathyroid hormone agent, can induce bone formation and thus has an advantage over conventional drugs that work for the prevention of bone resorption. However, it suffers from the disadvantages of being administered by daily injection over a long period of time and being very expensive. There is therefore a need for a novel medication and method that can increase bone mass and improve bone quality to substantially reduce the risk of fracture, thus being applicable to the treatment of osteoporosis.

Ischemic diseases are caused by a local restriction in blood supply due to various pathological abnormalities in the blood vessels, with resultant damage or dysfunction of tissues. Blood supply through vessels is essential for wound healing or tissue regeneration. Vascular diseases, such as arteriosclerosis, myocardial infarction, and angina pectoris are caused by restricted blood supply.

Vascular therapy is used to treat diseases by generating vessels. VEGF, a vascularization factor, is already used as a therapeutic for severe ischemia. Other vasculogenic or angiogenic factors such as FGF (fibroblast growth factor), epidermal growth factor (EGF) and platelet-derived endothelial growth factor (PDEGF) have also been studied for clinical use. However, these factors are proteins and are thus difficult to separate and purify. In addition, they are too expensive for clinical application.

Leading to the present invention, intensive and thorough research into the treatment of bone diseases and ischemic diseases, conducted by the present inventors under the above described background, resulted in the finding that a low-molecular weight peptide derived from BMP-7, named BFP 4 (bone forming peptide 4), can be economically synthesized and has the activity of promoting osteogenesis and vascularization.

It is an object of the present invention to provide an isolated peptide for the promotion of osteogenesis or vascularization, comprising an amino acid sequence as set forth in SEQ ID NO: 1.

It is another object of the present invention to provide an isolated polynucleotide encoding the peptide.

It is a further object of the present invention to provide a recombinant vector comprising the polynucleotide.

It is still a further object of the present invention to provide a pharmaceutical composition for the prevention or treatment of a bone disease or an ischemic disease, comprising the peptide, a polynucleotide encoding the peptide, or a recombinant vector comprising the polynucleotide as an active ingredient.

It is still another object of the present invention to provide a method for the prevention or treatment of a bone disease or an ischemic disease, comprising administering the pharmaceutical composition to a subject which has been afflicted with or is likely to be afflicted with a bone disease or an ischemic disease.

It is yet another object of the present invention to provide a method for the promotion of osteogenesis or vascularization, comprising administering to a subject in need thereof a therapeutically effective amount of the pharmaceutical composition.

It is yet a further object of the present invention to provide the use of the peptide, a polynucleotide encoding the peptide, or a recombinant vector comprising the polynucleotide in the preparation of a medication for a bone disease or an ischemic disease.

The peptide for promoting osteogenesis in accordance with the present invention has a low molecular weight so that it can be economically synthesized. In addition, the peptide of the present invention can promote osteoblastic differentiation, thus inducing osteogenesis. Hence, the peptide of the present invention is useful in the prevention or treatment of bone diseases.

Also, the peptide for promoting vascularization in accordance with the present invention can induce the expression of VEGF, resulting in vascularization. Therefore, the peptide of the present invention is applicable to the prevention or treatment of ischemic diseases.

FIG. 1 is a diagram showing the properties of BFP 4, amino acid sequence, structure and net charge of BFP 4.

FIG. 2 is photographs showing the ability of BFP 4 to promote osteoblastic differentiation, as analyzed by Alizarin red S staining.

FIG. 3 is a graph showing the non-cytotoxicity of BFP 4 to calls.

FIG. 4 is graphs showing BFP 4-induced increases in both ALP activity and calcium level.

FIG. 5 is a photograph showing the BFP 4-induced expression of runx2, osteocalcin and ALP genes.

FIG. 6 is graphs showing the BFP 4-induced expression of CD44 and CD51 associated with osteoblastic differentiation, as analyzed by FACS.

FIG. 7 is fluorescence microphotographs showing the BFP 4-induced expression of CD44 and CD51.

FIG. 8 is X-ray photographs showing the BFP 4-induced osteogenesis in transplanted regions of mice.

FIG. 9 is a photograph showing the BFP 4-induced expression of VEGF.

FIG. 10 is a photograph showing the BFP 4-induced vascularization in Matrigel transplanted into an animal.

In accordance with one aspect thereof, the present invention provides an isolate peptide for promoting osteogenesis or vascularization, comprising an amino acid sequence as set forth in SEQ ID NO: 1.

SEQ ID NO: 1:

Phe-Phe-Lys-Ala-Thr-Glu-Val-His-Phe-Arg-Ser-Ile-Arg-Ser-Thr

As used herein, the term “osteogenesis” is intended to refer to the process of laying down new bone materials, including the formation of bone matrix by osteoblasts and the mineralization thereof.

The term “vascularization,” as used herein, is intended to refer to the physical process of blood vessel formation, that is, the generation of new blood vessels into cells, tissues or organs, including both the de novo production of endothelial cells (vasculogenesis) and the growth of new blood vessels from pre-existing ones (angiogenesis).

The term “promoting osteogenesis or vascularization” or grammatical variations thereof, as used herein, means bringing about osteogenesis or vascularization within a short time, including the induction of osteogenesis and vascularization.

The term “peptide,” as used herein, means a polymer of amino acids linked by peptide bonds. Each of the amino acids may have an L- or D-configuration. The peptide of the present invention comprises an amino acid sequence of SEQ ID NO: 1. A variation of the peptides including fusion with other amino acids or peptides is within the scope of the present invention so long as it has the activity of promoting osteogenesis or vascularization.

The amino acid useful in the present invention may include a naturally occurring amino acid, a synthetic amino acid, and an amino acid analog and an amino acid mimic, which act like naturally occurring amino acids. The term “naturally occurring amino acid” means an amino acid encoded by genetic code. The amino acid analog is a compound which has hydrogen atoms, a carboxyl group, an amino group and an α carbon atom linked to an R group, with a modification given to the R group (e.g., norleucine) or the peptide backbone. The term “amino acid mimic”means a chemical compound which differs from amino acids in chemical structure, but acts like a naturally occurring amino acid.

The broad scope of the present invention encompasses an analog of the peptide of the present invention. the analog means a functional equivalent and is a peptide that presents effectively homogeneous biologically activity. The homogeneous biologically activity means a peptide having at least about 60% homology, preferably at least about 70% homology, more preferably at least about 90% homology with amino acid having a sequence set forth in SEQ ID NO: 1.

The amino acid sequence of SEQ ID NO: 1 may be derived from BMP7, and preferably from the prodomain of BMP-7. BMPs are known as factors capable of inducing ossification, but exist in a trace amount in nature. BMPs have high-molecular weights and the recombinant preparation thereof is very expensive. In contrast, the peptide of the present invention is a low-molecular weight compound comprising 15 amino acids and can be produced economically. Also in light of function, the peptide of the present invention exhibits an osteogenic effect identical to or higher than that of BMP-7.

Preferably, the peptide of the present invention may promote osteoblast differentiation or VEGF expression.

Preferably, the peptide of the present invention may be a peptide having the activity of promoting osteogenesis and vascularization.

In an experiment in which the differentiation of osteoblasts was examined, the peptide of the present invention was found to promote osteoblastic differentiation at higher levels than BMP-7, as measured by Alizarin Red staining (FIG. 2). Also, an animal test with mice showed that bone formation was achieved to an even greater extent in the site treated with the peptide of the present invention than with BMP-7 (FIG. 8). Therefore, the peptide of the present invention can be useful for the prevention and treatment of bone diseases.

The expression of VEGF, known as a potent factor involved in vasculogenesis and angiogenesis, stimulates the formation of new blood vessels. In an example of the present invention, a higher level of VEGF was expressed by the peptide of the present invention than by BMP-7 (FIG. 9). An animal test of mice showed that the peptide of the present invention induced the formation of new blood vessels in matrigel (FIG. 10). Therefore, the peptide of the present invention can be useful for the prevention and treatment of ischemic diseases.

The peptide of the present invention may be prepared using a well-known chemical synthesis method or a genetically engineering method. In the latter case, typically, a polynucleotide encoding the peptide is introduced into an expression vector which is then transformed into a host cell, and the tansformant is cultured to produce the peptide. For culturing the transformant, any appropriate method known in the art may be used.

In accordance with another aspect thereof, the present invention provides a polynucleotide encoding the peptide of the present invention, and a recombinant vector comprising the same.

The term “polynucleotide”refers to a polymer composed of many nucleotide monomers covalently bonded in a chain, which is exemplified by DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). The polynucleotide of the present invention comprises a polynucleotide encoding the peptide of the present invention.

In the polynucleotide of the present invention, various modifications may be made in the encoding region within the range in which they do not change the amino acid sequence of the polypeptide expressed from the coding region, due to codon degeneracy, or in consideration of the codons preferred by the organism in which they are to be expressed, and various modifications or alterations may be introduced even in regions other than the coding region so long as they have no influence on the expression of the gene. That is to say, the polynucleotide of the present invention may be modified at one or more nucleic acid bases by substitution, deletion, insertion or a combination thereof, as long as the resulting polynucleotides encode functionally equivalent polypeptides, and they are also within the scope of the present invention.

The recombinant vector of the present invention is a means for expressing the peptide of the present invention within a host cell. Any expression vector such as a plasmid vector, a cosmid vector, a bacteriophage vector, and so on may be used so long as it is well known in the art. The vector may be readily constructed by the artisan of ordinary skill using a well-known DNA recombination technique.

In accordance with a further aspect thereof, the present invention provides a pharmaceutical composition for the prevention or treatment of a bone disease or an ischemic disease, comprising as an active ingredient the peptide of the present invention, a polynucleotide encoding the peptide, or a recombinant vector comprising the polynucleotide.

In accordance with still a further aspect thereof, the present invention provides a method for the prevention or treatment of a bone disease or an ischemic disease, comprising administering the pharmaceutical composition to a subject which has been afflicted with or is likely to be afflicted with the bone disease or the ischemic disease.

In accordance with still another aspect thereof, the present invention provides a method for promoting osteogenesis or vascularization, comprising administering to a subject in need thereof a therapeutically effective amount of the pharmaceutical composition.

As used herein, the term “prevention” refers to any measure taken in order to suppress or delay the onset of bone diseases or ischemic diseases by administering the pharmaceutical composition of the present invention. The term “treatment,” as used herein, refers to any measure taken in order to improve or beneficially alter symptoms of bone diseases or ischemic diseases by administering the pharmaceutical composition of the present invention.

The term “subject,”as used herein, refers to any animal including humans, which has been afflicted with or is likely to be afflicted with the bone disease or ischemic disease. The bone disease may be selected from the group consisting of osteoporosis, osteoarthritis, bone fracture, osteogenesis imperfecta and a combination thereof. The ischemic disease may be one selected from the group consisting of ischemic necrosis, ischemic cerebrovascular diseases, ischemic renal diseases, ischemic lung diseases, ischemic diseases of the limbs, ischemic heart diseases, apoplexy, cerebral infarction, myocardial infarction, ischemic heart failure, angina pectoris, arteriosclerosis obstructive and a combination thereof.

So long as it allows the pharmaceutical composition of the present invention to reach tissues or cells of interest (e.g. bone-defected site), any administration route may be taken. Depending on the purposes of administration, the pharmaceutical composition of the present invention may be administered directly or indirectly via intraperitoneal, intravenous, intramuscular, subcutaneous, interdermal, oral, intrapulmonary, intrarectal, or intracellular routes. In this regard, the pharmaceutical composition of the present invention may be administered by means of any device capable of transporting an active ingredient into target cells.

The pharmaceutical composition of the present invention may further comprise a pharmaceutically acceptable vehicle. When containing a pharmaceutically acceptable vehicle, the pharmaceutical composition of the present invention may be in various oral or non-oral dosage forms. In this regard, the pharmaceutical composition of the present invention may be formulated in combination with a diluents or excipient such as a filler, a thickener, a binder, a wetting agent, a disintegrant, a surfactant, etc. Solid preparations intended for oral administration may take the form of tablets, pills, powders, granules, capsules, and the like. In regards to these solid agents, the peptide of the present invention is formulated in combination with at least one excipient such as starch, calcium carbonate, sucrose, lactose, or gelatin. Liquid preparations intended for oral administration include suspensions, internal use solutions, emulsion, syrups, and the like. In addition to a simple diluent such as water or liquid paraffin, various excipients, such as wetting agents, sweetening agents, aromatics, preservatives, and the like may be contained in the liquid preparations. Also, the pharmaceutical composition of the present invention may be administered via a non-oral route. For this, sterile aqueous solutions, non-aqueous solvents, suspensions, emulsions, lyophilizates, suppositories, and the like may be used. Injectable propylene glycol, polyethylene glycol, vegetable oils such as olive oil, and esters such as ethyl oleate may be suitable for non-aqueous solvents and suspensions. The basic materials of suppositories include Witepsol, macrogol, Tween 61, cacao butter, laurin butter, and glycerogelatin.

The pharmaceutical composition of the present invention may take a dosage form selected from the group consisting of a tablet, a pill, a powder, a granule, a suspension, an internal use solution, an emulsion, a syrup, a sterile aqueous solution, a non-aqueous solution, a lyophilizate, and a suppository.

The pharmaceutical composition of the present invention is administered in a therapeutically or pharmaceutically effective amount. The term “therapeutically or pharmaceutically effective amount,” as used herein, is intended to refer to a sufficient amount of the pharmaceutical composition to treat a disease, at a reasonable benefit/risk ratio applicable to any medical treatment. The effective amount may vary depending on various factors including the severity of the disease being treated, the patient’s age and sex, drug activity, sensitivity to drugs, the time of administration, the route of administration, the rate of excretion, the period of time of treatment, the co-administration of drugs, and other parameters well known in the art.

For treating bone diseases or ischemic diseases, the pharmaceutical composition of the present invention may be used in combination with surgery, hormones, drugs, and/or biological reaction regulators.

In accordance with yet another object thereof, the present invention provides the use of the peptide of the present invention, a polynucleotide encoding the peptide, or a recombinant vector comprising the polynucleotide in preparation of a medication for a bone disease or an ischemic disease.

As described hitherto, the peptide of the present invention has a low molecular weight so that it can be economically produced. In addition it is superior to BMP-7 in terms of osteogenesis and vascularization. Hence, the peptide of the present invention can be used as an active ingredient of medications for bone diseases or ischemic diseases.

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 limiting the present invention.

EXAMPLE 1: Synthesis of BFP 4

The peptide having the amino acid sequence of SEQ ID NO: 1 can be artificially synthesized using a well-known method. The synthesis of the peptide was entrusted to Peptron (Korea). The peptide having the amino acid sequence of SEQ ID NO: 1 was named BFP 4 (bone forming peptide 4).

SEQ ID NO: 1

Phe-Phe-Lys-Ala-Thr-Glu-Val-His-Phe-Arg-Ser-Ile-Arg-Ser-Thr

Analysis with a commercial program showed that BFP 4 is composed of 15 amino acid residues with a molecular weight of 1826.1 and has an alpha-helix structure as illustrated in FIG. 1.

EXAMPLE 2: Preparation of Osteoblasts and Osteogenic Differentiation Medium

For use as osteoblasts in this example, mesenchymal stem cells isolated from Balb/c mouse bone marrow stromal cells were seeded at a density of 1x10⁴ cells in a DMEM medium supplemented with 10% FBS and incubated at 37℃ for about 3 days in a 5% CO₂ atmosphere.

An osteogenic differentiation medium (ODM) was prepared by supplementing DMEM with 50 μg/mL ascorbic acid, 10^-8 M dexamethasone and 10 mM beta-glycrophosphate.

EXAMPLE 3: Assay of BFP 4 for Ability to Promote Osteoblastic Differentiation

Because calcium is deposited when the mesenchymal stem cells differentiate into osteoblasts, the degree of osteoblastic differentiation was analyzed by measuring mineralization with Alizarin red staining. That is, a greater advance in osteoblastic differentiation produced a wider region positive to Alizarin red. After the cells in the osteogenic differentiation medium were treated with BFP 4 in the presence of Alizarin Red, the staining of Alizarin red was monitored to determine the degree of osteoblastic differentiation. In this regard, the mesenchymal cells were transferred into an osteogenic differentiation medium and incubated for three days. Thereafter, BFP 4 or BMP-7 was added at concentrations of 0.001 μg/mL, 0.01 μg/mL, 0.05 μg/mL, and 0.1 μg/mL to the medium, followed by incubation for an additional 2 days. Subsequently, the mesenchymal stem cells were fixed for one hour with ice-cooled 70% ethanol and stained for about 10 min with Alizarin red-S to analyze the degree of deposition of calcium. The results are shown in FIG. 2.

As can be seen in FIG. 2, the most intensive staining was detected in the cells treated with BFP 4 at a concentration of 0.01 μg/mL. Particularly, BFP 4 according to the present invention was found to produce more intensive colors than did BMP-7 (FIG. 2). These data indicate that BFP 4 has a more potent activity of osteoblastic differentiation compared to BMP-7.

EXAMPLE 4: Assay for Cytotoxicity of BFP 4

At the concentrations effective for calcium deposition, BFP 4 was analyzed for cytotoxicity. The result is shown in FIG. 3. In this context, MTT assay was performed using an MTT Cell Proliferation Assay Kit (Cayman Chemical) according to the instructions of the manufacturer.

As seen in FIG. 3, cytotoxicity was not detected at the concentration of BFP 4 which is effective for promoting osteogenic differentiation.

EXAMPLE 5: Assay of BFP 4 for Ability to Increase ALP Activity and Calcium Level

During osteoblastic differentiation, alkaline phosphatase (ALP), a marker enzyme characteristic of osteoblasts, and calcium were quantitatively analyzed using a DALP-250 QuantiChrom Alkaline Phosphatase Assay Kit (Gentaur) and a DICA-500 QuantiChrom Calcium Assay Kit (Gentaur), respectively. The results are depicted in FIG. 4.

As can be seen in FIG. 4, both the activity of ALP and the concentration of calcium were significantly increased at BFP 4 concentrations of 0.01 μg/mL and 0.1 μg/mL.

EXAMPLE 6: Assay for BFP 4-Induced Osteoblast-Specific Gene Expression

BFP 4 was assayed for ability to induce the expression of runx2, osteocalcin and alkaline phosphatase genes, which are marker genes characteristic of osteoblasts. The results are shown in FIG. 5. In this regard, RNA was isolated from the cells treated with the peptide and reverse transcribed into DNA which was then used as a template for PCR. Electrophoresis of the PCR products determined the expression levels of the marker genes.

As shown in FIG. 5, BFP 4 induced the osteoblast-specific genes to be expressed.

EXAMPLE 7: Assay of BFP 4-Induced Cell Surface Marker Expression During Osteoblastic Differentiation

The effect of BFP 4 on the expression of CD44 and CD51, surface proteins characteristically emerging during differentiation from mesenchymal stem cells into osteoblasts, was measured using FACS. The results are shown in FIG. 6.

As seen in FIG. 6, when BFP 4 was added to the osteogenic differentiation medium, the cell surface marker CD44 was expressed at a high level in the mesenchymal cells which were undergoing osteoblastic differentiation. Particularly, a peak in the expression level of CD44 was detected at a BFP 4 concentration of 0.1 μg/mL. Also, CD51 was expressed at higher levels in the presence of BFP 4 during the osteoblastic differentiation (FIG. 6).

EXAMPLE 8: Assay for BFP 4-Induced Expression of Cell Surface Markers CD44 and CD51

The BFP 4-induced expression of the cell surface markers CD44 and CD51 was observed using a fluorescence microscope, and the results are given in FIG. 7. In this regard, DAPI staining was performed to ascertain the viability of the cells during osteoblastic differentiation, and anti-CD44 or CD51 antibodies, which appear red in color when they bind to the antigens, were used for fluorescence analysis.

As can be seen in FIG. 7, both CD44 and CD51 were expressed in the cells. Higher expression levels of CD44 and CD51 were observed in the osteogenic differentiation medium in the presence of BFP 4.

EXAMPLE 9: In vivo Assay of BFP 4 for Ability to Promote Osteogenesis

An animal test with mice (n=6) was performed to examine the ability of BFP 4 to promote osteogenesis in vivo. First, mesenchymal stem cells were treated twice with ODM over three days to induce osteoblastic differentiation. Upon the second treatment with ODM, BMP-7 or BFP 4 was added to the cells, followed by incubation for 24 hours. Cells were harvested and transplanted in the same number into the back of the mice, with collagen serving as a scaffold. Using X-rays, bone formation was examined 4 and 8 weeks after the transplantation. The results are given in FIG. 8.

As can be seen in the X-ray photographs of FIG. 8, 4 weeks after transplantation, new bones were formed in the region treated with BFP 4. In addition, as seen in the photographs taken 8 weeks after transplantation, a significantly higher extent of bone formation was achieved in the region treated with BFP 4 than that treated with BMP-7. These experimental results imply that BFP 4 has higher activity of promoting osteoblastic differentiation compared to the conventional factor BMP-7, and can be useful for the prevention and treatment of bone diseases.

EXAMPLE 10: Assay for BFP 4-Induced VEGF Expression

To examine the effect of BFP 4 on vascularization, BFP 4 was assayed for ability to induce VEGF expression. In this regard, proteins were isolated from the cells treated with the peptide and subjected to electrophoresis before measurement using an anti-VEGF antibody.

As seen in FIG. 9, the expression of VEGF was induced by BFP 4 and to a higher level than by BMP-7.

EXAMPLE 11: In vivo Assay for Vacularization of BFP 4

To examine the ability of BFP 4 to form new blood vessels in vivo, mouse animal test was performed using Matrigel. In this context, cells were treated with the peptide and mixed well with Matrigel before transplantation into the back of the mice. Eight weeks after the transplantation, the Matrigel was detached from the mouse back which was then observed with regard to the formation of new blood vessels.

As shown in FIG. 10, the formation of blood vessels was induced by BFP 4 in the Matrigel 8 weeks after the transplantation and to a higher level than by BMP-7.

Claims

An isolated peptide for promoting osteogenesis or vascularization, comprising the amino acid sequence as set forth in SEQ ID NO: 1.
The isolated peptide of claim 1, wherein the amino acid sequence of SEQ ID NO: 1 is derived from BMP-7.
The isolated peptide of claim 1, having an activity of promoting osteoblastic differentiation or VEGF expression.
The isolated peptide of claim 1, having an activity of promoting osteogenesis and vascularization.
An isolated polynucleotide, encoding the peptide of claim 1.
A recombinant vector, comprising the polynucleotide of claim 5.
A pharmaceutical composition for prevention or treatment of a bone disease or an ischemic disease, comprising as an active ingredient the peptide as in one of claims 1-4, a polynucleotide encoding the peptide, or a recombinant vector comprising the polynucleotide.
The pharmaceutical composition of claim 7, wherein the bone disease is selected from the group consisting of osteoporosis, osteoarthritis, bone fracture, osteogenesis imperfecta, and combinations thereof.
The pharmaceutical composition of claim 7, wherein the ischemic disease is selected from the group consisting of ischemic necrosis, ischemic cerebrovascular disease, ischemic renal diseases, ischemic lung diseases, ischemic diseases of limbs, ischemic heart diseases, apoplexy, cerebral infarction, myocardial infarction, ischemic heart failure, arteriosclerosis obstructive, and combinations thereof.
A method for prevention or treatment of a bone disease or an ischemic disease, comprising administering the pharmaceutical composition of claim 7 to a subject which has been afflicted with or is likely to be afflicted with a bone disease or an ischemic disease.
The method of claim 10, wherein the bone disease is selected from the group consisting of osteoporosis, osteoarthritis, bone fracture, osteogenesis imperfecta, and combinations thereof.
The method of claim 10, wherein the ischemic disease is selected from the group consisting of ischemic necrosis, ischemic cerebrovascular disease, ischemic renal diseases, ischemic lung diseases, ischemic diseases of limbs, ischemic heart diseases, apoplexy, cerebral infarction, myocardial infarction, ischemic heart failure, arteriosclerosis obstructive, and combinations thereof.
A method for promoting osteogenesis or vascularization, comprising administering to a subject in need thereof a therapeutically effective amount of the pharmaceutical composition according to claim 7.
The method of claim 13, wherein the subject is a patient with a bone disease or an ischemic disease.
Use of the peptide as in one of claims 1-4, a polynucleotide encoding the peptide, or a recombinant vector comprising the polynucleotide in preparation of a medication for a bone disease or an ischemic disease.