WO2011102363A1 - 化学修飾水溶性エラスチン、化学修飾水溶性エラスチンとコラーゲンとの混合ゲル及びそれらの製造方法 - Google Patents
化学修飾水溶性エラスチン、化学修飾水溶性エラスチンとコラーゲンとの混合ゲル及びそれらの製造方法 Download PDFInfo
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- WO2011102363A1 WO2011102363A1 PCT/JP2011/053228 JP2011053228W WO2011102363A1 WO 2011102363 A1 WO2011102363 A1 WO 2011102363A1 JP 2011053228 W JP2011053228 W JP 2011053228W WO 2011102363 A1 WO2011102363 A1 WO 2011102363A1
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- Prior art keywords
- soluble elastin
- chemically modified
- collagen
- modified water
- water
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/14—Macromolecular materials
- A61L27/22—Polypeptides or derivatives thereof, e.g. degradation products
- A61L27/227—Other specific proteins or polypeptides not covered by A61L27/222, A61L27/225 or A61L27/24
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/14—Macromolecular materials
- A61L27/22—Polypeptides or derivatives thereof, e.g. degradation products
- A61L27/24—Collagen
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L27/507—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials for artificial blood vessels
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L27/52—Hydrogels or hydrocolloids
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/78—Connective tissue peptides, e.g. collagen, elastin, laminin, fibronectin, vitronectin or cold insoluble globulin [CIG]
Definitions
- the present invention relates to chemically modified water-soluble elastin, a mixed gel of chemically modified water-soluble elastin and collagen, and methods for producing them, which may be used for applications such as artificial blood vessel materials.
- Artificial blood vessels are mainly used as substitutes for blood vessels in the body in the case of cardiovascular diseases and injuries.
- An example of an artificial blood vessel that is currently attracting attention is a hybrid artificial blood vessel in which collagen, gelatin, elastin, fibronectin or the like is introduced into a synthetic polymer material and cells are seeded.
- This hybrid type artificial blood vessel has a problem that cells are peeled off by being influenced by intense blood flow.
- the base material is a synthetic polymer, there is also a problem in terms of biocompatibility.
- an anticoagulant is used so that the blood vessel lumen is not narrowed by a thrombus There is a problem that you have to continue drinking. Furthermore, when this artificial blood vessel is transplanted in the growth phase, there is a problem that the artificial blood vessel must be transplanted again by surgery along with the growth.
- e-PTFE expanded porous polytetrafluoroethylene
- this polymer is excellent in non-adhesiveness and flexibility.
- e-PTFE expanded porous polytetrafluoroethylene
- biopolymers are attracting attention as materials that can replace synthetic polymers.
- collagen is present in large amounts in the living body (occupies about 1/3 of proteins in the living body) and has biocompatibility and cell adhesiveness, and attempts have been made to produce artificial blood vessels using this.
- 100% collagen has a problem in strength.
- Elastin is a protein that is present together with collagen in connective tissues such as the dermis, ligaments, tendons and blood vessel walls of the skin of animals, particularly mammals. Elastin usually exists as an insoluble protein having a three-dimensional network structure in vivo. It is widely known that the above-mentioned water-soluble elastin can be obtained by hydrolyzing such elastin with an acid or an alkali or treating it with an enzyme. Water-soluble elastin has the ability to retain abundant moisture, so it is used as a cosmetic product, especially as a moisturizer, and as a health food with collagen, etc. Has been.
- the water-soluble elastin is mixed with a solubilized cogen to obtain a molding composition (Patent Document 1), or a collagen layer is provided on the inner wall surface of the artificial blood vessel base material.
- a molding composition Patent Document 1
- a collagen layer is provided on the inner wall surface of the artificial blood vessel base material.
- Cross-linking with a cross-linking agent Patent Document 2
- the present inventors have proposed a method for obtaining water-soluble elastin (Patent Document 4).
- An object of the present invention is to provide a medical material such as an artificial blood vessel that is excellent in biocompatibility and has sufficient strength, elasticity, and extensibility by utilizing water-soluble elastin and collagen.
- One aspect of the present invention is to N-acylate part or all of the primary amine and secondary amine contained in the high molecular weight water-soluble elastin molecule, and to form one of the carboxyl groups contained in the molecule.
- a chemically modified water-soluble elastin obtained by coupling a part or all of the amino group with an amino group of an alkyl ester of an amino acid.
- N-acylation includes N-formylation, N-acetylation, N-benzoylation, etc., and N-acetylation is preferred.
- a urethane type or an alkyl type may be used.
- the amino acid used for acid amidation with the amino acid alkyl ester of the carboxyl group of elastin is selected from about 20 types such as glycine, valine, and phenylalanine constituting the protein.
- “high molecular weight water-soluble elastin” means that having a molecular weight of about 10,000 or more, preferably about 30,000 to 300,000.
- Another aspect of the present invention is to N-acylate part or all of a primary amine and a secondary amine contained in a molecule of high molecular weight water-soluble elastin and a part of a carboxyl group contained in the molecule.
- a chemically modified water-soluble elastin / collagen mixed gel obtained by mixing a chemically modified water-soluble elastin obtained by coupling all with the amino group of an amino acid alkyl ester and collagen.
- a chemically modified water-soluble elastin / collagen mixed gel obtained by mixing substantially the same weight of collagen with the chemically modified water-soluble elastin is preferable.
- a chemically modified water-soluble elastin / collagen mixed gel obtained by mixing a chemically modified water-soluble elastin and a smaller or larger amount of collagen. “Substantially the same weight” means that the weight ratio of chemically modified water-soluble elastin to collagen is within 95 to 105% by weight.
- Still another embodiment of the present invention is a method for producing the chemically modified water-soluble elastin / collagen mixed gel, wherein (1) part of the primary amine and the secondary amine contained in the molecule of the high molecular weight water-soluble elastin. Or (2) coupling part or all of the carboxyl groups contained in the molecule of the high molecular weight water-soluble elastin with the amino group of a lower alkyl ester of an amino acid; and 3) A chemically modified water-soluble elastin / collagen mixed gel comprising a step of preparing a mixed gel by mixing the chemically modified water-soluble elastin obtained through the steps (1) and (2) with collagen in a solution state. It is a manufacturing method. Also in this embodiment, a method of mixing chemically modified water-soluble elastin and collagen of approximately the same weight is preferable. Also preferred is a method of mixing chemically modified water-soluble elastin and a smaller or larger amount of collagen.
- a further aspect of the present invention is as follows: (1) N-acylation of part or all of the primary amine and secondary amine contained in the high molecular weight water-soluble elastin molecule; (2) the high molecular weight water soluble A step of coupling a part or all of the carboxyl group contained in the molecule of elastin with an amino group of a lower alkyl ester of an amino acid, (3) a chemically modified aqueous solution obtained through the steps (1) and (2) Chemically modified water-soluble elastin / collagen mixture comprising the steps of: mixing elastin with collagen in solution to prepare a mixed gel; and (4) irradiating the mixed gel obtained in (3) with radiation. It is a manufacturing method of a gel.
- a method of mixing chemically modified water-soluble elastin and collagen of approximately the same weight is preferable. Also preferred is a method of mixing chemically modified water-soluble elastin and a smaller or larger amount of collagen.
- Yet another aspect of the present invention is the use of the above chemically modified water-soluble elastin as a medical material. Still another aspect of the present invention is the use of the above chemically modified water-soluble elastin / collagen mixed gel or the chemically modified water-soluble elastin / collagen mixed gel produced by the above production method as a medical material. is there.
- the medical material includes an artificial blood vessel material and the like.
- the material obtained from the chemically modified water-soluble elastin / collagen mixed gel of the present invention is greatly improved in strength, elasticity and extensibility compared to elastin or collagen alone or a mixture thereof, medical treatment such as artificial blood vessels There is a high possibility that it can be used as a material.
- amino acids with high hydrophobicity are used as amino acids for chemical modification, or when peptides with high hydrophobicity are used for chemical modification, the strength, elasticity and An extensible artificial blood vessel material or the like can be produced.
- a curve showing the relationship between temperature and turbidity of unmodified water-soluble elastin (Ela) at pH 5.0, 7.4 and 9.0.
- N-acetyl-OG-methyl ester water-soluble elastin produced by coupling N-acetyl water-soluble elastin (N-Ac-Ela) and glycine (G) methyl ester using WSCI (100 eq) (Cm ( Turbidity curves of G) -Ela) at pH 5.0, 7.4 and 9.0.
- PH of N-acetyl-OG-methyl ester water-soluble elastin (Cm (G) -Ela) prepared by coupling N-Ac-Ela and glycine (G) methyl ester using WSCI (10 eq). Turbidity curves at 0, 7.4 and 9.0.
- PH of N-acetyl-OG-methyl ester water-soluble elastin (Cm (G) -Ela) prepared by coupling N-Ac-Ela and glycine (G) methyl ester using WSCI (50 eq). Turbidity curves at 0, 7.4 and 9.0.
- Col single gel (1.5mg / ml), Ela-Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml), Cm (G) -Ela-Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml) ml) Stress-strain curve.
- Cm (G) -Ela / Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml) and Cm (G) -Ela / Col mixed gel (Cm (G) -Ela / Col mixed gel) Stress-strain curve with a mixing ratio of 4.5 mg / ml: 1.5 mg / ml.
- Cm (G) -Ela ⁇ Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml)
- Cm (V) -Ela ⁇ Col mixed gel (mixing ratio 1.5mg / ml: A stress-strain curve comparing the stress and strain up to 60% strain of 1.5 mg / ml)
- Cm (F) -Ela / Col mixed gel (mixing ratio 1.5 mg / ml: 1.5 mg / ml) and porcine aorta.
- Ela / Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml), ⁇ -irradiated Ela / Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml), Cm (G) -Ela / Col mixed Gel (mixing ratio 1.5mg / ml: 1.5mg / ml), ⁇ -irradiated Cm (G) -Ela / Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml) and porcine aorta stress and strain Stress-strain curve compared.
- Ela / Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml), ⁇ -irradiated Ela / Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml), Cm (G) -Ela / Col mixed Gel (mixing ratio 1.5mg / ml: 1.5mg / ml), ⁇ -irradiated Cm (G) -Ela / Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml) and up to 50% strain of porcine aorta Stress-strain curve comparing the stress and strain.
- water-soluble elastin of the present invention is derived from mammals and birds
- about 78 to 85% of amino acids constituting elastin are composed of proline, glycine, alanine and valine, and about 2 to 4% are aspartic acid and glutamic acid.
- about 1-2% consisting of lysine, histidine, arginine, about 0.1-0.4% consisting of desmosine and isodesmosine, having a molecular weight of about 10,000-300,000, preferably about 30,000-300,000 High molecular weight water-soluble elastin.
- water-soluble elastin of the present invention when the water-soluble elastin of the present invention is derived from fish, about 67 to 77% of the amino acids constituting elastin are composed of proline, glycine, alanine and valine, and about 4 to 6% are composed of aspartic acid and glutamic acid. About 2 to 4% consisting of lysine, histidine and arginine, about 0.1 to 0.4% consisting of desmosine and isodesmosine, and having a molecular weight of about 10,000 to 300,000, preferably about 30,000 to 300,000 It is water-soluble elastin.
- the chemically modified water-soluble elastin of the present invention N-acylates part or all of the primary amine and the secondary amine contained in the molecule of the high molecular weight water-soluble elastin and the carboxyl group contained in the molecule. It is a chemically modified water-soluble elastin obtained by coupling a part or all of it with the amino group of an alkyl ester of an amino acid.
- N-acylation includes N-formylation, N-acetylation, N-benzoylation and the like, and N-acetylation is preferred.
- a urethane type or an alkyl type may be used.
- the amino acid used for the acid amidation with the amino acid alkyl ester of the carboxyl group of elastin may be any of about 20 types such as glycine, valine, and phenylalanine constituting the protein.
- the chemically modified water-soluble elastin / collagen mixed gel first N-acylates part or all of the primary amine and the secondary amine contained in the molecule of the high molecular weight water-soluble elastin. Step (first step), and then chemically modifying a part or all of the carboxyl groups contained in the resulting N-acylated water-soluble elastin molecule with the amino group of the lower alkyl ester of amino acid (first step). 2 steps), and then the resulting chemically modified water-soluble elastin is mixed in a solution state with almost the same weight, or a small amount or a large amount of collagen in a solution state to produce a mixed gel (third step). Is done.
- the radiation-modified chemically modified water-soluble elastin / collagen mixed gel which is a further embodiment of the present invention is a method in which a part or all of the primary amine and the secondary amine contained in the molecule of the high molecular weight water-soluble elastin are first N-acyl. Next, a part or all of the carboxyl groups contained in the obtained N-acylated water-soluble elastin molecule are coupled with amino groups of lower alkyl esters of amino acids and chemically modified (second step). ) Further, chemically modified water-soluble elastin obtained through the first step and the second step is mixed with collagen in a solution state to prepare a mixed gel (third step), and then the obtained mixed gel is used.
- Obtained by irradiation with radiation (fourth step). Also in this embodiment, it is produced by a step of preparing a mixed gel by mixing chemically modified water-soluble elastin in a solution state with almost the same weight, or a smaller amount or a larger amount of collagen.
- the weight ratio of chemically modified water-soluble elastin to collagen is preferably 1/200 to 200/1, more preferably 1/100 to 50/1, and still more preferably 1/50 to 5/1, particularly preferably 1/3 to 3/1.
- the weight ratio is 1/50 to 5/1 is preferable, and when an artificial fiber, an artificial anti-adhesion membrane, an artificial suture or an artificial membrane is produced instead of a substitute for living tissue, it is better that the range of elastin weight / collagen weight is wide.
- the weight ratio is preferably 1/100 to 50/1, and when applied to other than living organisms such as synthetic fibers and synthetic membranes, the range of elastin weight / collagen weight is wider.
- the weight ratio is preferably 1/200 to 200/1.
- the N-terminus of water-soluble elastin and the amino group of the side chain of amino acid residues such as lysine and arginine are acylated, and the carboxyl group of the side chain of amino acid residue such as aspartic acid and glutamic acid, etc.
- amino group of amino acid alkyl ester are coupled to obtain chemically modified water-soluble elastin.
- the charge of elastin disappears.
- hydrophobic interaction between elastin molecules increases, and the resulting chemically modified water-soluble elastin is unmodified. It is considered that it has higher self-assembling properties than elastin.
- insoluble elastin is obtained by removing collagen and other unnecessary proteins from animal biological tissue, and then this insoluble elastin is immersed and dissolved in a solubilizing solution such as oxalic acid or sodium hydroxide. Produces water-soluble elastin.
- Collagen and other unwanted protein removal treatment is an alkaline solution containing at least one of sodium hydroxide, potassium hydroxide, calcium hydroxide, and barium hydroxide, and sodium hydroxide added to the alkaline solution.
- the total amount of potassium hydroxide, calcium hydroxide and barium hydroxide is 0.05 to 0.5 mol, preferably 0.05 to 0.3 mol, and 90 to 105 ° C.
- tissue per liter, It is preferable to immerse the tissue for 5 to 60 minutes, preferably 10 to 20 minutes.
- animal biological tissue is placed in a salt solution containing at least one of sodium chloride, potassium chloride, calcium chloride, and barium chloride. It is also preferable to perform an immersion treatment (pretreatment) for immersion.
- the animal living tissue is not particularly limited, but it is preferable to use a ligament or aortic blood vessel obtained from mammals such as pigs, horses, cows, sheep, etc. in view of a high content of elastin.
- aortic blood vessels of birds and arterial spheres (hearts) of fish with high elastin content may be used.
- Animal biological tissue is preferably homogenized first using a homogenizer.
- any animal tissue such as a mixer or meat chopper can be shredded, and preferably a tool capable of shredding into 3 mm square or less, more preferably paste-like. It is preferable that the size of the shredded animal biological tissue is smaller because the efficiency of removing collagen and other unnecessary proteins can be increased.
- the homogenized animal biological tissue may be degreased by boiling it with hot water or a hot dilute alkaline aqueous solution, or treating it with an organic solvent, for example.
- solubilized solution examples include oxalic acid, formic acid, acetic acid, succinic acid, malic acid, tartaric acid, citric acid, benzoic acid, betaine, difluoroacetic acid, trifluoroacetic acid, phosphoric acid, sulfamic acid, perchloric acid, and trichloroacetic acid.
- An acidic solution containing at least one of them is used.
- the total amount of acid in this acidic solution is 0.05 to 5 mol, preferably 0.1 to 2 mol per liter, and the liquid temperature is preferably 90 to 105 ° C.
- the solubilizing solution may be an alkaline solution containing at least one of sodium hydroxide, potassium hydroxide, calcium hydroxide, and barium hydroxide.
- the total amount of sodium hydroxide, potassium hydroxide, calcium hydroxide and barium hydroxide added to this alkaline solution is 0.05 to 5 mol, preferably 0.05 to 2 mol per liter, and the liquid temperature is 90 to An alkaline solution at 105 ° C. is preferred.
- the second method includes a pretreatment step including at least one of removal processing of unnecessary parts of animal biological tissue, shredding treatment of animal biological tissue, degreasing treatment of animal biological tissue, and salt treatment; Filtration is performed by repeating the alkali extraction step of immersing the treated animal living tissue in an alkaline solution and filtering off collagen and other unwanted proteins, and the alkali dissolution step of dissolving the residue after the alkali extraction step with alkali a predetermined number of times.
- a method for producing water-soluble elastin by sequentially performing a filtrate recovery step for obtaining a filtrate containing water-soluble elastin and a water-soluble elastin production step for producing water-soluble elastin from the filtrate.
- the alkali used in the alkali dissolution step is preferably any one of sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, or a mixture.
- This operation is different from the first method in which collagen and other unwanted proteins are removed from the tissue to obtain insoluble elastin, and then the insoluble elastin is solubilized to obtain water-soluble elastin.
- This is a method for directly obtaining water-soluble elastin without obtaining insoluble elastin. That is, animal living tissue that has been shredded, degreased and salt-treated in an alkaline solution of 0.05 to 0.5 mol per liter, preferably 0.05 to 0.3 mol and 90 to 105 ° C., for 5 to 60 minutes.
- this treated tissue is immersed for 10 to 20 minutes to obtain a treated tissue from which collagen other than elastin and unwanted proteins have been removed, and then this treated tissue is 0.05 to 5 mol per liter, preferably 0.05 to 2 mol (of alkaline solution).
- This is a method of obtaining water-soluble elastin by immersing and dissolving in an alkaline solution at a higher concentration of 90 to 105 ° C. for 5 to 420 minutes, preferably 10 to 240 minutes (longer time).
- the water-soluble elastin obtained by the first or second method as described above neutralizes the aqueous solution containing the water-soluble elastin, and then the neutralized solution is subjected to, for example, dialysis treatment or nanofiltration (NF ) Desalination by membrane treatment using a membrane or the like, and removal of low molecular weight one yields the high molecular weight water-soluble elastin used in the present invention.
- NF nanofiltration
- any collagen known for medical use can be used as the collagen used in the present invention.
- Collagen suitable for medical use is usually extracted from an animal, which is a raw material, with an enzyme or the like under conditions of acid, alkali, neutrality, etc., and is a viscous collagen solution or a solid state obtained by drying this solution. The method of obtaining is generally used.
- the antigenic expression site can be removed by pepsin treatment, and collagen (atelocollagen) more suitable for a medical base material that is not antigenic when transplanted into the body or body surface can be obtained.
- Representative collagens used in the present invention include solubilized collagens such as acid-solubilized collagen, alkali-solubilized collagen, enzyme-solubilized collagen and neutral-solubilized collagen.
- Atelocollagen which has been subjected to removal of telopeptides that are antigenic determinants, is preferred.
- first, part or all of the primary amine and the secondary amine contained in the molecule of the high molecular weight water-soluble elastin are N-acylated, preferably , N-acetylation to obtain N-acetylated water-soluble elastin.
- amino acid residues constituting elastin examples of amino acids having a reactive primary amine or secondary amine (basic amino acids) include lysine, arginine and histidine.
- the primary amine contained in includes a terminal amino group.
- some or all of the primary amine and secondary amine contained in the high molecular weight water-soluble elastin molecule are preferably N-acetylated by an acetylating reagent such as acetic anhydride.
- the degree of acetylation is preferably 95% or more in terms of the modification rate represented by the following formula.
- Modification rate (%) (1 ⁇ B / A) ⁇ 100
- A represents a value obtained by subtracting the average value of the absorbance of the blank from the average value of the absorbance (wavelength of 345 nm) of the water-soluble elastin.
- B represents a value obtained by subtracting the average value of the absorbance of the blank from the average value of the absorbance (wavelength of 345 nm) of the N-acetylated water-soluble elastin.
- a part or all of the carboxyl groups contained in the obtained N-acylated, preferably N-acetylated water-soluble elastin molecule are then coupled with the amino group of the alkyl ester of the amino acid for chemical reaction.
- a lower alkyl ester having 1 to 4 carbon atoms is preferable, and a methyl ester is particularly preferable.
- a benzyl ester or the like may be used.
- amino acids having a carboxyl group include aspartic acid and glutamic acid, but the carboxyl group contained in the molecule of high molecular weight water-soluble elastin includes a terminal carboxyl group. Is also included.
- N-acylated, preferably N-acetylated water-soluble elastin molecules, in which almost all of the carboxyl groups are coupled to the amino group of an amino acid alkyl ester are preferred.
- a coupling agent such as carbodiimide or a condensing agent.
- the chemically modified water-soluble elastin obtained as described above and the above-described aqueous solution of collagen are prepared, respectively, in an aqueous solution containing almost the same weight, or chemically modified water-soluble elastin for collagen.
- the chemically modified water-soluble elastin / collagen mixed gel of the present invention is obtained.
- the obtained mixed gel can be used as a base for medical materials such as artificial blood vessels as it is or after undergoing appropriate processing.
- the chemically modified water-soluble elastin / collagen mixed gel obtained as described above is irradiated with radiation such as electron beams or ⁇ rays in a swollen state or in a dry state. Irradiation chemically modified water-soluble elastin / collagen mixed gel is obtained.
- radiation ⁇ rays are preferable, and a dose necessary for increasing the Young's modulus of the mixed gel is preferably doubled or more.
- the mixed gel is sterilized and cross-linked, and the strength of the material is further enhanced. Irradiation conditions are not particularly limited.
- irradiation at 20 to 50 ° C., preferably 30 to 40 ° C., about 0.5 to 50 kGy, preferably about 5 to 40 kGy is appropriate. It is.
- Modification rate of N-acetylation The modification rate of N-acetylation is measured and calculated as follows by the TNBS (2,4,6-trinitrobenzenesulfonic acid) method.
- N-Ac-Ela N-acetylated water-soluble elastin
- Each of water-soluble elastin (Ela), three types of chemically modified water-soluble elastin (Cm-Ela), type I collagen (Col) is PBS (phosphate buffered saline, pH 7.4) or pH 5.0, 7.4, Dissolved in 9.0 solution.
- PBS phosphate buffered saline, pH 7.4
- pH 5.0, 7.4 Dissolved in 9.0 solution.
- Each of these solutions is Ela alone, 3 Cm-Ela alone, Col alone, Ela and Col coexistence state, 3 Cm-Ela and Col coexistence state, wavelength 400 nm, temperature range 5 ° C to 65 ° C, temperature rise 0.5 Turbidity measurement was performed under the conditions of ° C / min and a nitrogen stream.
- the solvent used was ultrapure water or PBS in consideration of physiological conditions, and the measuring instrument was a spectrophotometer with a Peltier temperature controller (manufactured by JASCO Corporation: Ubest-50).
- porcine-derived water-soluble elastin 1) Isolation of porcine-derived insoluble elastin According to the following procedure, unnecessary protein and collagen other than NaCl-soluble and NaOH-soluble elastin were extracted and removed from porcine aortic defatted tissue.
- porcine aortic defatted tissue living tissue
- remove the unnecessary part by scraping off the low elastin content parts such as fat and muscle attached as pretreatment with a blade etc., and then living tissue was shredded by homogenizing using a homogenizer.
- the homogenized biological tissue was treated with hot water, a hot dilute aqueous alkali solution or an organic solvent such as acetone, degreased, and then dried.
- 1M sodium chloride of about 10 times the weight of the defatted dry tissue was added and stirred for 1 hour at room temperature to extract and remove NaCl-soluble unwanted protein. This operation was repeated 5 times, then washed with distilled water and drained by centrifugation (3,000 rpm, 5 minutes).
- water-soluble elastin derived from high molecular weight pig was chemically modified by N-acetylation and coupling of O-amino acid methyl ester.
- this solution was dialyzed for 1 week to remove the solvent and unreacted reagent, and lyophilized to obtain N-acetyl water-soluble elastin.
- the number of mole equivalents (eq) of the reagent is displayed based on the number of moles of the raw material used (1 mole equivalent) determined from the average molecular weight of N-acetyl water-soluble elastin. The same applies to the brief description of the drawings.
- this solution is dialyzed for 1 week to remove the solvent and unreacted reagents and freeze-dried, and three kinds of chemically modified water-soluble elastins, that is, N-acetyl-OG-methyl ester water-soluble elastin (Cm (G) -Ela), N-acetyl-OV-methyl ester water-soluble elastin (Cm (V) -Ela), N-acetyl-OF-methyl ester water-soluble elastin (Cm (F)- Ela).
- N-acetyl-OG-methyl ester water-soluble elastin Cm (G) -Ela
- N-acetyl-OV-methyl ester water-soluble elastin Cm (V) -Ela
- N-acetyl-OF-methyl ester water-soluble elastin Cm (F)- Ela
- FIG. 1 is a curve (turbidity curve) showing the relationship between temperature and turbidity of unmodified Ela at pH 5.0, 7.4 and 9.0
- FIG. 2 is a graph showing N-Ac-Ela and glycine (G) methyl ester with WSCI ( It is a turbidity curve in pH5.0, 7.4, and 9.0 of Cm (G) -Ela produced by coupling using 100 eq). From FIG. 1, Ela does not self-assemble at physiological conditions of 37 ° C. and pH 7.4.
- the reason for not self-assembling is that Ela has an isoelectric point on the acidic side (around pH 5.5). Therefore, in order to bring the isoelectric point near pH 7.4, in the present invention, the amino group is N-acetylated and the carboxyl group is chemically modified by coupling amino acid methyl ester.
- the self-assembly start temperature of the chemically modified water-soluble elastin (Cm-Ela) obtained was shifted to the low temperature side with respect to the self-assembly start temperature of Ela, and physiological conditions (pH 7 It can be seen that the turbidity intensity is sufficiently high at around 4). In addition, since the turbidity intensity is increased, and almost the same turbidity curve was obtained even at different pHs, the modification rate of carboxyl groups and the like by coupling of amino acid methyl ester should be almost complete. I understand.
- FIG. 3 and FIG. 4 are diagrams showing the relationship between the addition amount of the coupling agent (WSCI) and the turbidity curve in the coupling reaction of N-Ac-Ela and amino acid methyl ester.
- FIG. 3 shows a case where WSCI is 10 eq
- FIG. 4 shows a case where WSCI is 50 eq. It can be seen that the amount of WSCI added greatly affects the modification rate, but considering that the WSCI in FIG. 2 is 100 eq, it can be seen that the coupling reaction proceeds almost completely with the use of 100 eq. .
- FIG. 5 shows turbidity curves of three different chemically modified water-soluble elastins, Cm (G) -Ela, Cm (V) -Ela, and Cm (F) -Ela. It can be seen that as the hydrophobicity of the used amino acids glycine (G), valine (V), and phenylalanine (F) increases, the self-assembly start temperature increases and the turbidity intensity also increases. This suggests that Ela's self-assembly is promoted the higher the hydrophobicity of the molecule.
- FIG. 6 shows the turbidity curve of Col alone solution.
- FIG. 7 shows turbidity curves of a mixed solution of Col and Ela and a mixed solution of Col and three types of Cm-Ela.
- the turbidity curve was the same as that of Col alone, and the turbidity intensity was lower than that of Col alone. From this, it is considered that in the case of unmodified Ela, Ela molecules are incorporated into Col in a state where they do not self-assemble due to the gelation property of Col that incorporates surrounding molecules at the start of self-assembly.
- the decrease in turbidity intensity is thought to be due to the incorporation of Ela molecules that are not self-assembled, rather than gelation with Col alone.
- the self-assembly start temperature showed the same self-assembly start temperature as that of each of the 3 types of Cm-Ela, but the turbidity intensity increased. This is because the self-assembly start temperature of the Cm-Ela and Col mixed solution was earlier than the self-assembly start temperature (gelation temperature) of Col alone. This is thought to be due to the influence.
- FIG. 8 shows stress-strain curves of the Col single gel, Ela and Col mixed gel, and Cm (G) -Ela and Col mixed gel.
- the breaking stress of the Col single gel was 89 kPa, and the maximum strain was 84%.
- the Ela-Col mixed gel had a breaking stress of 87 kPa and a maximum strain of 101%, which was the same as that of the Col single gel, and the maximum strain increased in the Col single gel.
- the Cm (G) -Ela / Col mixed gel had a breaking stress of 106 kPa and a maximum strain of 109%. Both the breaking stress and the maximum strain increased compared to the Ela / Col mixed gel. These results are thought to be due to the addition of elasticity to the gel by adding Ela to the Col, and the addition of Cm (G) -Ela, which has a higher self-assembly ability, to add rigidity and greater elasticity.
- FIG. 9 shows stress-strain curves of Cm (G) -Ela and Col mixed gels having different mixing ratios of Cm (G) -Ela to Col.
- Figure 9 shows that Cm (G) -Ela / Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml) has a breaking stress of 106kPa and a maximum strain of 109%.
- the breaking stress of the mixture ratio (4.5 mg / ml: 1.5 mg / ml) was 114 kPa, the maximum strain was 130%, and both the breaking stress and the maximum strain increased. This is thought to be because greater elasticity and rigidity were added by increasing the amount of Cm (G) -Ela added.
- the increase rate of the maximum strain (20%) was larger than the increase rate of the breaking stress (8%), it can be considered that the contribution to the elastic improvement is larger than the stiffness of Ela.
- FIG. 10 shows stress-strain curves of Cm (G) -Ela and Col mixed gel, Cm (V) -Ela and Col mixed gel, Cm (F) -Ela and Col mixed gel, and porcine aorta.
- the stress for 60% strain is 43 kPa for Cm (G) -Ela / Col mixed gel (mixing ratio 1.5 mg / ml: 1.5 mg / ml), Cm (V) -Ela / Col mixed gel (mixing ratio 1.5).
- Table 1 shows three chemically modified water-soluble elastin / collagen mixed gels of the present invention, Cm (G) -Ela / Col mixed gel (mixing ratio 1.5 mg / ml: 1.5 mg / ml), Cm (V) -Ela-Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml), Cm (F) -Ela-Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml) and Cm (G) -Ela ⁇ Col mixed gel 15kGy, 30kGy ⁇ -irradiated 15kGy ⁇ -irradiated Cm (G) -Ela ⁇ Col mixed gel (mixing ratio 1.5mg / ml: 1.5mg / ml), 30kGy ⁇ -irradiated Cm (G) -Ela The values obtained by comparing the stress of 50% strain of Col mixed gel (mixing ratio 1.5mg / ml: 1.5m
- Col had a molecular weight of about 300,000, but when gelled, it formed Col fibers with a three-dimensional network structure. Then, Cm-Ela having a molecular weight of about 200,000 entered between the Col fibers and self-assembled, so that the collagen fibers were entangled and a more durable structure was formed.
- Cm (G) -Ela ⁇ Col mixed solution (mixing ratio 1.5 mg / ml: 1.5 mg / ml) prepared using PBS (pH 7.4) under low temperature was injected into a tube with a diameter of 8 mm, and then the diameter A mixed solution was formed into a tubular shape between a diameter of 8 mm and a diameter of 5 mm by inserting a 5 mm middle rod. Then, the mixed solution was allowed to stand at 37 ° C. for about 1 hour to gel, and further dried at 37 ° C., then PBS was added and left to stand for 48 hours to swell, and the intermediate rod was removed to produce an artificial blood vessel ( FIG. 11).
- the stress-strain curves of the Ela / Col mixed gel and the ⁇ -irradiated Ela / Col mixed gel are shown in FIG.
- the ⁇ -irradiated Ela / Col mixed gel showed a higher breaking strength than the non-irradiated Ela / Col mixed gel.
- the stress-strain curves of the Cm (G) -Ela / Col mixed gel and the ⁇ -irradiated Cm (G) -Ela / Col mixed gel are shown in FIG.
- the breaking strength of the ⁇ -irradiated Cm (G) -Ela / Col mixed gel is larger than that of the non-irradiated Cm (G) -Ela / Col mixed gel, and also from the ⁇ -irradiated Ela / Col mixed gel (see FIG. 12). Was also big.
- FIG. 14 shows the stress-strain curves of Ela-Col mixed gel, ⁇ -irradiated Ela-Col mixed gel, Cm (G) -Ela-Col mixed gel, ⁇ -irradiated Cm (G) -Ela-Col mixed gel, and porcine aorta.
- FIG. 15 shows a stress-strain curve up to a strain of 50%.
- the maximum stress of the ⁇ -irradiated Ela / Col mixed gel was about 1.5 times and the maximum strain was about 0.5 times that of the Ela / Col mixed gel (FIG. 12).
- the maximum stress of the ⁇ -irradiated Cm (G) -Ela / Col mixed gel was higher than the limit value of the measuring instrument compared to the Cm (G) -Ela / Col mixed gel (FIG. 13). This is presumably because the mixed gel was crosslinked by ⁇ -ray irradiation.
- ⁇ -irradiated Ela / Col mixed gel results in a smaller maximum strain, but the strength is increased, so even the strain of ⁇ -irradiated Ela / Col gel is sufficient as a material. Further, in the ⁇ -irradiated Cm (G) -Ela / Col mixed gel, the limit value of the measuring instrument was reached, so that the strength increased so that the maximum stress and the maximum strain could not be measured. This suggests that ⁇ -ray irradiation is a useful means for preparing a material for an artificial blood vessel, and that a ⁇ -ray irradiation mixed gel can be used as a material for an artificial blood vessel.
- the chemically modified water-soluble elastin / collagen mixed gel of the present invention can be used as an artificial blood vessel as a substitute for a human blood vessel, and can be used for the treatment of circulatory diseases such as arteriosclerosis and aneurysm. It can also be applied to artificial ligaments, artificial tendons, artificial skin, artificial alveoli, artificial uterus, and the like. Furthermore, it can be applied to cosmetic surgery to be embedded in the skin for wrinkle removal.
- the chemically modified water-soluble elastin / collagen mixed gel of the present invention is also useful as an artificial tissue in which epithelial cells, endothelial cells, fibroblasts, smooth muscle cells, chondrocytes, etc. are seeded and grown in the mixed gel. is there.
- the chemically modified water-soluble elastin / collagen mixed gel of the present invention comprises an epithelial growth factor, fibroblast growth factor, insulin-like growth factor, vascular endothelial growth factor, transforming growth factor, platelet-derived growth factor.
- Growth factor (growth factor), chondroitin sulfate, dermatan sulfate, heparan sulfate, keratan sulfate, heparin, hyaluronic acid and other glycosaminoglycans, fibronectin, laminin, vitronectin, tenascin, thrombospondin, entactin, osteopontin, vonville It is also useful as an artificial tissue to which cell adhesion proteins such as brand factor and fibrinogen are added.
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Abstract
Description
本発明の更に他の態様は、上記の化学修飾水溶性エラスチンの医療用材料としての使用である。また、本発明の更に他の態様は、上記の化学修飾水溶性エラスチン・コラーゲン混合ゲル、又は、上記の製造方法により製造された化学修飾水溶性エラスチン・コラーゲン混合ゲルの医療用材料としての使用である。ここで、医療用材料には人工血管材料等が含まれる。
例えば、本発明の化学修飾水溶性エラスチン・コラーゲン混合ゲルを使用して生体組織の代替としての人工靭帯、人工皮膚、人工腱、人工血管等を作製する場合は、前記重量比が1/50~5/1であることが好ましく、生体組織の代替ではなく人工の線維、人工癒着防止膜、人工縫合糸あるいは人工膜等を作製する場合には、エラスチン重量/コラーゲン重量の範囲が広い方がよく、前記重量比が1/100~50/1であることが好ましく、また、生体以外の例えば合成繊維や合成膜等に応用していく場合は、エラスチン重量/コラーゲン重量の範囲がさらに広い方がよく、前記重量比が1/200~200/1であることが好ましい。
修飾率(%)=(1-B/A)×100
Aは、水溶性エラスチンの吸光度(波長345nm)の平均値からブランクの吸光度の平均値を引いた値を表す。Bは、N-アセチル化水溶性エラスチンの吸光度(波長345nm)の平均値からブランクの吸光度の平均値を引いた値を表す。
γ線等で照射することによって、混合ゲルは滅菌架橋され、更に材料の強度の増強が図られる。照射条件は特に限定されるものではないが、例えば、Co-60γ線の場合、20~50℃、好ましくは30~40℃で0.5~50kGy程度、好ましくは5~40kGy程度の照射が適当である。
N-アセチル化の修飾率は、TNBS(2,4,6-トリニトロベンゼンスルホン酸)法より以下のようにして測定し計算される。1mg/mlのN-アセチル化水溶性エラスチン(N-Ac-Ela)水溶液に、4%の炭酸水素ナトリウム溶液、0.1%のTNBS水溶液を、それぞれ1ml加えた。4%の炭酸水素ナトリウム溶液、0.1%のTNBS水溶液をそれぞれ1ml加えただけのものを、ブランクとした(n=3)。作製した溶液をアルミホイルで遮光し、40℃で2時間反応させた。反応終了後、作製した溶液0.17mlに10%SDS1ml、1N・HClを0.5ml加え、345nmにおける吸光度をそれぞれ測定した。また、修飾率は以下の式より求めた。
水溶性エラスチン(Ela)、3種類の化学修飾水溶性エラスチン(Cm-Ela)、I型コラーゲン(Col)の各々をPBS(リン酸緩衝生理食塩水、pH7.4)又はpH5.0、7.4、9.0の溶液に溶解した。これらの各溶液をEla単独、3種Cm-Ela単独、Col単独、ElaとCol共存状態、3種Cm-ElaとCol共存状態で波長400nm、温度範囲5℃から65℃、温度上昇0.5℃/min、窒素気流下の条件で濁度測定を行った。溶媒は超純水又は生理的条件下を考慮してPBSを用い、測定機器はペルチェ式温度コントローラー付分光光度計(日本分光(株)製:Ubest-50)を用いた。
1)ブタ由来不溶性エラスチンの単離
以下の手順に従ってブタ大動脈脱脂組織からNaCl可溶及びNaOH可溶のエラスチン以外の不要タンパク質やコラーゲンを抽出、除去した。
ブタ由来不溶性エラスチンにその乾燥重量の10倍容量の0.5Nの水酸化ナトリウムを加え、100℃で30分撹拌した。反応後、溶液を速やかに氷冷し酢酸又は塩酸で中和した。その後、分子量6,000~8,000以上を分画する透析膜を用いて1週間透析した。その後、凍結乾燥し高分子量ブタ由来水溶性エラスチンを得た。
下記のとおり、高分子量ブタ由来水溶性エラスチンをN-アセチル化及びO-アミノ酸メチルエステルのカップリングによる化学修飾を行った。
前記で得られたブタ由来水溶性エラスチンを、少量のトリフルオロエタノール(TFE)に溶解したものに、ピリジン(100eq)と無水酢酸(100eq)を加え、1晩撹拌した。ニンヒドリン試験によってアセチル化が定量的に進行したことを確認した後、反応液をエバポレーターにより減圧濃縮した。このN-アセチル化は、TNBS法よりアミノ基等の修飾率が95%以上になるまで、数回繰り返し行った。その後、この溶液を1週間透析して溶媒や未反応試薬を除去し、凍結乾燥してN-アセチル水溶性エラスチンを得た。
なお、本発明において、N-アセチル水溶性エラスチンの平均分子量から求めた使用原料のモル数(1モル当量)を基準にして、試薬のモル当量数(eq)を表示した。図面の簡単な説明においても同様である。
前記で得られたN-アセチル水溶性エラスチン(N-Ac-Ela)を、少量のジメチルホルムアミド(DMF)に溶解したものに、水溶性カルボジイミド(WSCI)を加えた。15分撹拌後、3種類のアミノ酸メチルエステル、即ち、グリシン(G)のメチルエステル(H-G-OMe)、バリン(V)のメチルエステル(H-V-OMe)、フェニルアラニン(F)のメチルエステル(H-F-OMe)の各々と、トリエチルアミンを溶かした少量のDMF溶液を加えた。一昼夜撹拌後、この溶液を1週間透析し、溶媒や未反応試薬等を除去し、凍結乾燥して3種類の化学修飾水溶性エラスチン、即ち、N-アセチル-O-G-メチルエステル水溶性エラスチン(Cm(G)-Ela)、N-アセチル-O-V-メチルエステル水溶性エラスチン(Cm(V)-Ela)、N-アセチル-O-F-メチルエステル水溶性エラスチン(Cm(F)-Ela)を得た。
コラーゲンと水溶性エラスチン、又は、コラーゲンと化学修飾水溶性エラスチンが各々1.5mg/ml:1.5mg/mlとなるように、またコラーゲンと化学修飾水溶性エラスチンが1.5mg/ml:4.5mg/mlとなるように、総量2mlの溶液を調製した。溶媒はPBS(pH7.4)を用いた。これを37℃で1時間静置しゲル化させた。その後、乾燥させてガラス化し、ついでPBS(pH7.4)を2ml加えて48時間静置することで膨潤させて本発明の化学修飾水溶性エラスチン・コラーゲン混合ゲルを得た。
図6はCol単独溶液の濁度曲線を示す。図7には、ColとEla混合溶液及びColと3種Cm-Ela混合溶液の濁度曲線を示した。ElaとCol混合溶液において濁度曲線はCol単独と同型であり、濁度強度はCol単独時より低下した。このことから、未修飾Elaでは自己集合開始時には周囲の分子を取り込むColのゲル化の特性により、Ela分子は自己集合しない状態でColに取り込まれていると考えられる。濁度強度の低下については、Col単独でゲル化するよりも、自己集合していないEla分子の取り込みによるものと考えられる。3種Cm-ElaとCol混合溶液では、それらの自己集合開始温度は3種Cm-Elaの各々の単独の場合と同様な自己集合開始温度を示したが、濁度強度は上昇した。これは、Cm-ElaとCol混合溶液の自己集合開始温度が、Col単独時の自己集合開始温度(ゲル化温度)より早かったことから、その自己集合開始時に、Cm-Elaの自己集合が大きく影響を与えているためであると考えられる。
ElaとColの混合ゲル及びCm-ElaとColの混合ゲルの、各々の初期長が5mmになるように両端をネジ式材料試験機(オートグラフAG-S-J、(株)島津製作所)に固定した後、各ゲルの厚みと幅を測定し、それぞれ横断面積を求めた。ついで各ゲルを変位速度0.05mm/sで3mm(ひずみ60%)だけ伸展したときの応力とひずみの関係を測定した。さらに各ゲルを変位速度0.05mm/sで破断まで引張り、破断応力を測定し、破断まで引っ張ったときの応力とひずみの関係を測定した。
グリッド作製において、2%コロジオン処理したグリッドはSuper High Clean Vacuum Coater SVC-700 Turbo(サンユー電子(株)製)を用いて、カーボンを約200Åの厚さで蒸着され、試料を吸着させる前にQuick Coater SC-701(サンユー電子(株)製)を用いて、ベンジルアミンをカーボン膜状に薄く散布する処理を行った。試料は凍結乾燥したゲルを剃刀で薄く切り、その切片を作製したグリッドにそのまま置き、倍率×6400でTEMによる観察を行った。
低温下でPBS(pH7.4)を用いて調製したCm(G)-Ela・Col混合溶液(混合比1.5mg/ml:1.5mg/ml)を径8mmの管内に注入し、次いで径5mmの中棒を挿入することにより径8mmと径5mmの間に混合溶液を管状に形成させた。その後、混合溶液を37℃で約1時間静置してゲル化させ、さらに37℃で乾燥した後にPBSを加えて48時間静置して膨潤させ、中棒を抜いて人工血管を作製した(図11)。
Ela・Col混合溶液(混合比1.5mg/ml:1.5mg/ml)、Cm(G)-Ela・Col混合溶液(混合比1.5mg/ml:1.5mg/ml)を37℃、1時間でゲル化させて、凍結乾燥し、PBS 2mlを加えて48時間膨潤させた。その後、γ線照射を、照射量15kGy及び30kGy、照射温度は40~50℃で行った。そして、放射線照射された本発明の化学修飾水溶性エラスチン・コラーゲン混合ゲルを得た。
上記で得られた放射線照射混合ゲルを、初期長が5mmとなるようにネジ式材料試験機(オートグラフAG-S-J、(株)島津製作所製)に固定した。ゲルの厚みと幅を測定し、断面積を求めた。混合ゲルを0.05mm/sの変位速度で伸展したときの応力とひずみの関係を測定し、また2.5mm(ひずみ50%)だけ伸長したときの応力とひずみの関係を測定した。さらに各ゲルを変位速度0.05mm/sで破断まで引張り、破断応力を測定し、破断まで引っ張ったときの応力とひずみの関係を測定した。
Claims (14)
- 高分子量水溶性エラスチンの分子中に含まれる第1アミン及び第2アミンの一部又は全部をN-アシル化すると共に、該分子中に含まれるカルボキシル基の一部又は全部をアミノ酸のアルキルエステルのアミノ基とカップリングさせて得られる化学修飾水溶性エラスチン。
- 高分子量水溶性エラスチンの分子中に含まれる第1アミン及び第2アミンの一部又は全部をN-アシル化すると共に、該分子中に含まれるカルボキシル基の一部又は全部をアミノ酸のアルキルエステルのアミノ基とカップリングさせて得られる化学修飾水溶性エラスチンと、コラーゲンを混合して得られる化学修飾水溶性エラスチン・コラーゲン混合ゲル。
- 化学修飾水溶性エラスチンとコラーゲンとの重量比(化学修飾水溶性エラスチン/コラーゲン)が、1/200~200/1である請求項2記載の化学修飾水溶性エラスチン・コラーゲン混合ゲル。
- 化学修飾水溶性エラスチンと、ほぼ同重量のコラーゲンを混合して得られる請求項2又は3記載の化学修飾水溶性エラスチン・コラーゲン混合ゲル。
- 化学修飾水溶性エラスチンとコラーゲンを混合して得られる混合ゲルに、放射線を照射したことを特徴とする請求項2~4のいずれか1項記載の化学修飾水溶性エラスチン・コラーゲン混合ゲル。
- (1)高分子量水溶性エラスチンの分子中に含まれる第1アミン及び第2アミンの一部又は全部をN-アシル化する工程、(2)該高分子量水溶性エラスチンの分子中に含まれるカルボキシル基の一部又は全部をアミノ酸の低級アルキルエステルのアミノ基とカップリングさせる工程、及び、(3)前記(1)と(2)の工程を経て得られた化学修飾水溶性エラスチンを、コラーゲンと溶液状態で混合して混合ゲルを調製する工程からなる化学修飾水溶性エラスチン・コラーゲン混合ゲルの製造方法。
- 化学修飾水溶性エラスチンとコラーゲンとの重量比(化学修飾水溶性エラスチン/コラーゲン)が、1/200~200/1である請求項6記載の化学修飾水溶性エラスチン・コラーゲン混合ゲルの製造方法。
- 化学修飾水溶性エラスチンと、ほぼ同重量のコラーゲンを混合することからなる請求項6又は7記載の化学修飾水溶性エラスチン・コラーゲン混合ゲルの製造方法。
- (1)高分子量水溶性エラスチンの分子中に含まれる第1アミン及び第2アミンの一部又は全部をN-アシル化する工程、(2)該高分子量水溶性エラスチンの分子中に含まれるカルボキシル基の一部又は全部をアミノ酸の低級アルキルエステルのアミノ基とカップリングさせる工程、(3)前記(1)と(2)の工程を経て得られた化学修飾水溶性エラスチンを、コラーゲンと溶液状態で混合して混合ゲルを調製する工程、及び、(4)前記(3)で得られた混合ゲルに放射線を照射する工程からなる化学修飾水溶性エラスチン・コラーゲン混合ゲルの製造方法。
- 化学修飾水溶性エラスチンと、ほぼ同重量のコラーゲンを混合して放射線照射することからなる請求項9記載の化学修飾水溶性エラスチン・コラーゲン混合ゲルの製造方法。
- 化学修飾水溶性エラスチンをコラーゲンよりも少量又は多量に混合して放射線照射することからなる請求項9記載の化学修飾水溶性エラスチン・コラーゲン混合ゲルの製造方法。
- 請求項1に記載の化学修飾水溶性エラスチンの医療用材料としての使用。
- 請求項2~5のいずれか1つに記載の化学修飾水溶性エラスチン・コラーゲン混合ゲル又は請求項6~11のいずれか1つに記載の製造方法により製造された化学修飾水溶性エラスチン・コラーゲン混合ゲルの医療用材料としての使用。
- 医療用材料が人工血管材料である、請求項13に記載の使用。
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CN106381323A (zh) * | 2016-10-26 | 2017-02-08 | 无限极(中国)有限公司 | 一种弹性蛋白肽及其制备方法、应用 |
CN106519020B (zh) * | 2016-10-31 | 2019-10-18 | 华南理工大学 | 一种具有美容功效的功能性肽及其制备方法和用途 |
CN107998453B (zh) * | 2017-12-12 | 2020-09-25 | 中山大学附属第一医院 | 一种表面改性的脱细胞基质及其改性方法 |
JP6712014B2 (ja) * | 2017-12-25 | 2020-06-17 | 国立大学法人九州工業大学 | 水溶性エラスチン |
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