WO2011155565A1 - 可逆的な性質を示す温度応答性シートとそれを用いた細胞シートの製造方法 - Google Patents
可逆的な性質を示す温度応答性シートとそれを用いた細胞シートの製造方法 Download PDFInfo
- Publication number
- WO2011155565A1 WO2011155565A1 PCT/JP2011/063265 JP2011063265W WO2011155565A1 WO 2011155565 A1 WO2011155565 A1 WO 2011155565A1 JP 2011063265 W JP2011063265 W JP 2011063265W WO 2011155565 A1 WO2011155565 A1 WO 2011155565A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- water
- sheet
- elastin
- soluble elastin
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/0068—General culture methods using substrates
-
- 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
-
- 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, cold insoluble globulin [CIG]
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/20—Material Coatings
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M33/00—Means for introduction, transport, positioning, extraction, harvesting, peeling or sampling of biological material in or from the apparatus
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M25/00—Means for supporting, enclosing or fixing the microorganisms, e.g. immunocoatings
- C12M25/14—Scaffolds; Matrices
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2533/00—Supports or coatings for cell culture, characterised by material
- C12N2533/50—Proteins
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2539/00—Supports and/or coatings for cell culture characterised by properties
- C12N2539/10—Coating allowing for selective detachment of cells, e.g. thermoreactive coating
Definitions
- the present invention relates to a temperature-responsive sheet exhibiting reversible properties and a method for producing a cell sheet including cultured cells using the same.
- the cell sheet can be used for transplanting a single layer sheet, transplanting a uniform tissue by stacking the same cell sheet, transplanting a tissue exhibiting a layered structure by stacking several different cell sheets, etc. Is done.
- 20 to 30 types of cell sheets have been produced, and clinical applications using epithelial cell systems such as cornea, retina, skin, bladder epithelium, periodontal ligament are being promoted.
- An object of the present invention is to produce a temperature-responsive sheet that is derived from a living body, has extremely low toxicity, and exhibits reversible properties, and uses the properties to recover the sheet-like cultured cells in their original form. Is to provide.
- the present inventors focused on water-soluble elastin, which is a biologically-derived material with extremely low toxicity instead of PIPAAm, and reduced the charge of water-soluble elastin by utilizing the coacervation forming ability of water-soluble elastin.
- An attempt was made to produce a reversible temperature-responsive sheet containing chemically modified water-soluble elastin having a high molecular assembly ability and to use it for the production of cell sheets.
- an attempt was made to produce a polypeptide having a peptide sequence in elastin that has extremely low toxicity, coacervation, and high molecular assembly ability in a reversible temperature-responsive sheet.
- the present inventors have found that the above-described problems are specifically achieved by the following aspects of the present invention.
- At least a part of a primary amine and a secondary amine contained in a molecule of water-soluble elastin is N-acylated, and at least a part of a carboxyl group contained in the molecule is converted to an amino acid. It is a temperature-responsive sheet containing chemically modified water-soluble elastin obtained by coupling with an alkyl ester.
- the temperature-responsive sheet of the present invention Preferred embodiments of the temperature-responsive sheet of the present invention are listed below.
- the temperature-responsive sheet it is preferable that at least a part of the primary amine and the secondary amine is N-acetylated and at least a part of the carboxyl group is coupled with a methyl ester of glycine.
- the modification rate defined by the formula (1) is preferably 80 mol% or more.
- Modification rate (mol%) (1 ⁇ B / A) ⁇ 100 (1)
- 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 the average of the absorbance (wavelength of 345 nm) of the N-acetylated water-soluble elastin. It represents a value obtained by subtracting the average value of the absorbance of the blank from the value.
- the protection of the carboxyl group it is preferable that 90 mol% or more of the carboxyl group is protected by methyl ester of glycine.
- the chemically modified water-soluble elastin forms a coacervate at a pH of 7.4 and a temperature of 37 ° C., and the temperature is 20 ° C. or less, preferably 1 to 20 ° C., more preferably 1 to 15 ° C.
- the coacervate dissolves.
- the water-soluble elastin is preferably a high-molecular weight water-soluble elastin obtained by removing a low molecular weight fraction by dialysis.
- the temperature-responsive sheet of the present invention is preferably used for preparing a cell sheet. More preferred is a combination of the above preferred embodiments.
- Another aspect of the present invention includes a step of culturing specific cells on a temperature-responsive sheet containing the chemically modified water-soluble elastin to produce a cell sheet, and then under conditions below the cell culture temperature.
- a method for producing a cell sheet comprising a step of separating the temperature-responsive sheet and the cell sheet.
- the manufacturing method includes a step of forming a gel film serving as a cell scaffold on the temperature-responsive sheet following the step of forming the temperature-responsive sheet.
- the membrane serving as a scaffold is preferably a gel membrane selected from the group consisting of so-called extracellular matrix.
- the membrane that serves as a scaffold is preferably a gel membrane selected from the group consisting of collagen, fibronectin, laminin, polylysine, and gelatin, and a gel selected from the group consisting of collagen, polylysine, and gelatin.
- a membrane is more preferred, and a collagen gel membrane is particularly preferred.
- the above-mentioned “gel membrane that serves as a cell scaffold” is composed of fibronectin, laminin, vitronectin, tenascin, thrombospondin, entactin, osteopontin, von Fon, which promotes cell adhesion and cell proliferation as a main component of extracellular matrix such as collagen.
- a small amount of a different extracellular matrix such as Billbrand factor, fibrinogen, chondroitin-6 sulfate, dermatan sulfate, keratan sulfate, heparan sulfate, heparin, and hyaluronic acid may be contained as an optional component.
- Still another aspect of the present invention is to chemically synthesize a polypeptide having a peptide sequence in elastin that exhibits coacervation in the same manner as the above chemically modified water-soluble elastin, and a sheet containing this polypeptide as a main component Is used for a reversible temperature-responsive sheet.
- Constaining as a main component means 90% by weight or more, and is preferably a sheet made of only a polypeptide. This polypeptide will be described in detail later.
- the present invention by utilizing the reversible temperature responsiveness of chemically modified water-soluble elastin, it can be produced as it is without damaging the cell sheet.
- a conventional temperature-responsive culture dish using PIPAAm there is a risk that toxic acrylamide monomer remains, but in the present invention, a safe protein or polypeptide derived from a living body is used, The cultured cells can be recovered in a sheet form simply by lowering the value.
- the figure which shows the coacervation of chemically modified water-soluble elastin and polypeptide The figure which showed typically the coacervation of chemically modified water-soluble elastin and polypeptide.
- the figure which shows gelatinization of collagen The figure which showed the gelatinization of collagen typically.
- a collagen gel was prepared on a coacervate of chemically modified water-soluble elastin N-Ac-Ela-O-Gly-OMe, and immediately after seeding fibroblasts on the gel (0 hour) Optical micrograph.
- a collagen gel was prepared on a coacervate of chemically modified water-soluble elastin N-Ac-Ela-O-Gly-OMe, fibroblasts were seeded on the gel, and the spindle state of fibroblasts after 24 hours of culture Optical micrograph.
- VPGVG polypeptide poly
- FIG. 1 is a diagram showing coacervation of chemically modified water-soluble elastin and the above polypeptide.
- the chemically modified water-soluble elastin or polypeptide is a transparent homogeneous solution at 15 ° C. or lower.
- B when heated to 20 ° C.
- FIG. 2 is a diagram schematically showing coacervation of chemically modified water-soluble elastin or polypeptide.
- the coacervate in the lower layer of C dissolves when cooled, and returns to the original transparent homogeneous solution. Therefore, the coacervate is used as a temperature-responsive material for recovering cells and cell sheets without damaging them.
- an aqueous solution of chemically modified water-soluble elastin or polypeptide is a transparent homogeneous solution at low temperature, but becomes cloudy when heated, and when left as it is, a transparent equilibrium solution (upper layer) and a pale yellow highly viscous coacervate (lower layer) ).
- This process is reversible and returns to the original homogeneous solution again upon cooling.
- the present invention utilizes this reversible property to produce and recover a cell sheet without damaging cells and extracellular matrix.
- the chemically modified water-soluble elastin in the present invention N-acylates at least a part of the primary amine and the secondary amine contained in the molecule of the water-soluble elastin and at least a part of the carboxyl group contained in the molecule. Is obtained by coupling with 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 the coupling is selected from about 20 types such as glycine, valine, and phenylalanine constituting the protein.
- high molecular weight water-soluble elastin refers to a product obtained by removing a relatively low-molecular component (about 5,000 or less) from water-soluble elastin.
- the low molecular weight component is preferably removed by dialysis using a dialysis membrane having a compartment molecular weight of 6,000 to 8,000.
- the main molecular weight of the high molecular weight water-soluble elastin is preferably about 10,000 or more, more preferably about 30,000 to 300,000.
- water-soluble elastin is obtained by partially hydrolyzing water-insoluble elastin. Specifically, animal biological tissues such as animal aorta, ligament ligament and fish arterial sphere are treated with acid. It is obtained by treatment with a solubilizing solution or an alkaline solubilizing solution. Typical water-soluble elastin is ⁇ -elastin or ⁇ -elastin obtained by heat oxalic acid treatment, and ⁇ -elastin obtained by treating elastin with alkaline ethanol. In addition, elastin digests that have been enzymatically treated with elastase and the like, and tropoelastin that is a precursor in the elastin biosynthesis pathway are included.
- the solubility of water-soluble elastin in water means that it is about 0.001 mg / ml or more and about 600 mg / ml or less at 5 ° C., and preferably 1 mg / ml or more and 600 mg / ml or less.
- the body tissue containing elastin Prior to the partial hydrolysis of water-insoluble elastin, the body tissue containing elastin is shredded, treated with hot water, a hot dilute alkaline aqueous solution, degreased by acetone extraction, and extracted with sodium chloride-soluble unwanted protein. It is preferable.
- a chemically modified water-soluble elastin is obtained by coupling a carboxyl group of an amino acid residue side chain such as glutamic acid and the amino group of an amino acid alkyl ester.
- a method for producing water-soluble elastin a method for chemically modifying water-soluble elastin, a method for producing a temperature-responsive sheet containing the chemically-modified water-soluble elastin of the present invention, and the obtained temperature-responsive sheet, A specific cell is cultured on the sheet to produce a cell sheet, and then the temperature-responsive sheet and the cell sheet are separated under a condition below the cell culture temperature, and the cell sheet is recovered intact.
- the method of performing will be described in detail.
- the first method obtains insoluble elastin by removing collagen and other unwanted proteins from animal living tissue, and then contains the insoluble elastin in an acidic solubilizing solution containing oxalic acid or the like, or sodium hydroxide or the like. It is immersed and dissolved in an alkaline solubilizing solution to produce 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.
- an alkaline solution in which the total amount of potassium hydroxide, calcium hydroxide and barium hydroxide is 0.03 to 0.5 mol, preferably 0.05 to 0.3 mol per liter, 90 to It is preferable to immerse at 105 ° C. for 5 to 60 minutes.
- animal biological tissue is added to a salt solution containing any one of sodium chloride, potassium chloride, calcium chloride, or barium chloride. It is also preferable to perform an immersion treatment (pretreatment) for immersing the material.
- 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. Also, arterial spheres of fish with a high elastin content may be used.
- Animal biological tissue is preferably homogenized first using a homogenizer. For homogenization, 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 treatment of unnecessary parts of animal biological tissue, degreasing treatment of animal biological tissue, and shredding treatment of animal biological tissue; Repeat the alkaline extraction process of immersing animal biological tissue in an alkaline solution and filtering off collagen and other unwanted proteins, and the alkaline dissolution process of dissolving the residue after the alkaline extraction process with alkali, and filter the solution to make it water-soluble.
- This is a method for producing water-soluble elastin by sequentially performing a filtrate recovery step for obtaining a filtrate containing 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 biological tissue that has been degreased, shredded, and salt-treated in an alkaline solution of 0.03 to 0.5 mol, preferably 0.05 to 0.3 mol, and 90 to 105 ° C., for 5 to 60 minutes. Immerse and obtain a treated tissue from which collagen and unnecessary proteins other than elastin have been removed.
- this treated tissue is 0.05 to 5 mol per liter, preferably 0.05 to 2 mol (the concentration of the alkaline solution is higher).
- water-soluble elastin is obtained by immersing in an alkaline solution at 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 is then subjected to, for example, dialysis treatment to remove a low molecular weight fraction, so that the high molecular weight water soluble preferably used in the present invention is used. Elastin is obtained. By removing the low molecular weight fraction, the advantage of water-soluble elastin with higher coacervation ability is obtained.
- the primary amine and the secondary amine contained in the molecule of the water-soluble elastin is N-acylated, preferably N-acetylated to form N -Acylated water-soluble elastin is obtained.
- amino acids having a reactive primary amine or secondary amine include lysine, arginine and histidine, but are included in the molecule of water-soluble elastin.
- the primary amine include a terminal amino group.
- the primary amine and the secondary amine contained in the high molecular weight water-soluble elastin molecule is N-acetylated.
- it is N-acetylated by an acetylating reagent such as acetic anhydride.
- the degree of N-acetylation is preferably 80 mol% or more in terms of the modification rate represented by the following formula (1). 90 mol% is more preferable, and 95 mol% or more is particularly preferable.
- Modification rate (mol%) (1 ⁇ B / A) ⁇ 100 (1)
- 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.
- N-acylation other than N-acetylation can be optically quantified under the same conditions.
- the primary amine and the secondary amine contained in the water-soluble elastin are N-acetylated by 90 mol% or more, it is preferable to use 0.5 to 5 mmol of acetic anhydride per 1 g of the water-soluble elastin.
- a chemically modified water-soluble compound obtained by coupling at least a part of a carboxyl group contained in the obtained N-acylated, preferably N-acetylated water-soluble elastin molecule, with an alkyl ester of an amino acid. Elastin is obtained.
- 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 water-soluble elastin molecule also includes a terminal carboxyl group. It is.
- N-acylated, preferably N-acetylated water-soluble elastin molecules, in which almost all of the carboxyl groups are modified by coupling with an amino acid alkyl ester are preferred.
- substantially all means that the reaction rate is 90 mol% or more.
- the reaction rate is preferably 95 mol% or more.
- a reaction rate of 90 mol% or more can be obtained.
- a coupling agent such as carbodiimide per 1 g of the raw water-soluble elastin.
- the amino group may be N-acylated after esterifying the carboxy group of water-soluble elastin.
- the composition containing chemically modified water-soluble elastin is used as a temperature-responsive sheet.
- the chemically modified water-soluble elastin other components can be used in combination as long as the function of temperature responsiveness is not inhibited.
- the temperature-responsive sheet has only a chemically modified water-soluble elastin or a polypeptide having a peptide sequence in elastin. It is preferable to use only.
- FIG. 3 is a diagram showing the gelation of collagen in a test tube.
- the collagen solution is in a sol state at 10 ° C. or lower.
- FIG. 3B when heated to 15 ° C. or higher, the collagen solution becomes cloudy and gels to become a collagen gel. This collagen gel does not return to its original sol state even when cooled.
- FIG. 4 is a diagram schematically showing the gelation of collagen. Collagen gel is used as a cell scaffold for cell sheet production. The scaffold is used to retain the shape of the cell sheet.
- Cell scaffold refers to the extracellular matrix necessary for normal animal cells (epithelial cells, endothelial cells, fibroblasts, smooth muscle cells, etc.) to live, as is well known to those skilled in the art. .
- the types of extracellular matrix are roughly classified into a collagen group, a non-collagenous glycoprotein group, an elastin group, and a proteoglycan group, and collagen, fibronectin, laminin, polylysine, and gelatin are exemplified as preferred specific examples.
- 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. Furthermore, 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.
- the collagen solution is in a sol state at a low temperature, but when heated, it gels and becomes a collagen gel. As shown in FIGS. 10 and 13, since this collagen gel does not return to its original sol state even when cooled, it can be used as a scaffold for cells in the production of a cell sheet.
- the method for producing a cell sheet according to the present invention includes a step of forming a temperature-responsive sheet containing chemically modified water-soluble elastin on a support, and culturing specific cells on the temperature-responsive sheet to produce a cell sheet. And a step of separating the temperature-responsive sheet and the cell sheet under conditions of 1 to 20 ° C., preferably 5 to 15 ° C., which are not higher than the cell culture temperature.
- a step of providing a layer such as a collagen gel as a scaffold that is an extracellular matrix on the temperature-responsive sheet is added, and specific cells are cultured on the layer such as the collagen gel. It is preferable to do.
- the above steps will be described below.
- the support as a base material for producing the temperature-responsive sheet is not particularly limited, and an inert support that does not adversely affect cell culture is used.
- a resin such as glass or polystyrene (PS) constituting a normal culture vessel can be exemplified.
- the temperature-responsive sheet containing chemically modified water-soluble elastin preferably contains chemically modified water-soluble elastin as a main component (90% by weight or more), and more preferably comprises only chemically modified water-soluble elastin.
- the thickness of the sheet is preferably on the order of nm to ⁇ m, and more preferably 50 nm to 500 ⁇ m. In other words, a dry coating amount of 0.01 to 100 g / m 2 is preferable.
- the incubation temperature for forming the coacervate is preferably 40 ° C. to 80 ° C., and more preferably 50 ° C. to 70 ° C. Drying is preferably performed at 35 ° C. to 40 ° C. for 5 to 20 minutes.
- the process of providing a collagen gel layer on a temperature responsive sheet will be described.
- the thickness of the collagen gel layer is preferably about 1 to 1,000 ⁇ m, and more preferably about 10 to 500 ⁇ m.
- the incubation temperature for film formation is preferably 30 ° C. to 40 ° C., more preferably around 37 ° C.
- the concentration of the solution is preferably from 0.1 mg / ml to 10 mg / ml, more preferably from 0.5 mg / ml to 2 mg / ml.
- a process for producing a cell sheet by culturing specific cells on the temperature-responsive sheet will be described.
- Specific cells include epithelial cells, endothelial cells, fibroblasts, smooth muscle cells and the like.
- Cell culture methods follow standard methods.
- the cell sheet may be a single layer or multiple layers. In the case of multiple layers, the same cells or different cells may be used.
- Growth factors such as vascular endothelial growth factor, fibroblast growth factor, epidermal growth factor, insulin-like growth factor, transforming growth factor, platelet-derived growth factor, etc. that promote cell culture to facilitate the production of cell sheets Can be added to the medium and cultured.
- This step is a step of separating the temperature-responsive sheet and the cell sheet under the condition below the cell culture temperature.
- “Culturing temperature or lower” means that when the culture temperature is 37 ° C., it is preferably 1 to 20 ° C., more preferably 10 to 15 ° C.
- FIG. 10 is a diagram schematically showing a state of a collagen gel in which fibroblasts are seeded on a coacervate of chemically modified water-soluble elastin N-Ac-Ela-O-Gly-OMe.
- 1 represents a collagen gel
- 2 represents a coacervate (temperature-responsive sheet) of N-Ac-Ela-O-Gly-OMe
- 3 represents a fibroblast.
- the temperature responsive sheet 2 comprising the chemically modified water-soluble elastin and the cell sheet 3 are lowered to a temperature below the culture temperature of the fibroblasts.
- separating is implemented.
- FIG. 11 is an optical micrograph showing an example of the spherical state of fibroblasts immediately after seeding on a collagen gel (0 hour), and 3 represents fibroblasts.
- FIG. 12 is an optical micrograph showing a spindle-like state of fibroblasts cultured for 24 hours after seeding on a collagen gel, and 3 represents fibroblasts.
- FIG. 13 is a diagram schematically illustrating a state in which a coacervate of chemically modified water-soluble elastin N-Ac-Ela-O-Gly-OMe is dissolved and a cell sheet made of collagen gel and fibroblasts is detached. is there. 1 is a collagen gel, 3 is a fibroblast, 4 is a detached cell sheet, and 5 is a state in which N-Ac-Ela-O-Gly-OMe coacervate (temperature-responsive sheet) is dissolved.
- a polypeptide obtained by chemically synthesizing the peptide sequence in elastin can be used instead of using chemically modified water-soluble elastin.
- peptide sequences in elastin include poly (VPGVG) and poly (VPGG). These polypeptides are peptides that are commonly present in elastin of mammals such as humans, pigs, and cows, and are very few problems in terms of toxicity and immunology.
- poly (PGVGV), poly (GVGVP), poly (GVPGV), poly (PGVV), poly (PGGGV), poly (VPGG) permutation polypeptides poly (PGVGV) GGVP) and poly (GVPG) are also included in the elastin-derived polypeptide.
- Poly (X 2 X 3 X 4 X 1 P), poly (X 3 X 4 X 1 PX 2 ) which is a substitution of poly (VGVPG), poly (X 4 X which is a substitution of poly (GVPGV) 1 PX 2 X 3 ), poly (VPGG) substitution poly (X 1 PX 2 X 3 ), poly (PGGV) substitution poly (PX 2 X 3 X 1 ), poly (GGVP) Poly (X 2 X 3 X 1 P) which is a substitute and poly (X 3 X 1 PX 2 ) which is a substitute of poly (GVPG) are also included in the polypeptide of the present invention.
- a polypeptide means one having a molecular weight of about 3,000 or more, preferably 5,000 to 100,000.
- X 1 , X 2 , X 3 , and X 4 may be any of about 20 types of amino acids constituting the protein.
- FIG. 14 is a flowchart showing four types of production (polymerization) methods of poly (VPGVG).
- ONp is p-nitrophenyl ester
- TFA is trifluoroacetic acid
- DMSO is dimethyl sulfoxide
- NMM is N-methylmorpholine
- WSCI is water-soluble carbodiimide
- HOBt ⁇ H 2 O is 1-hydroxybenzotriazole monohydrate
- Sulfo -NHS represents sulfosuccinimide
- DW represents distilled water
- Bis-PNPC represents bis (4-nitrophenol) carbonate.
- N-Ac-Ela N-acetylated water-soluble elastin
- Modification rate (mol%) (1 ⁇ B / A) ⁇ 100
- A represents the average value of the absorbance (wavelength 345 nm) of the elastin aqueous solution minus the average value of the absorbance of the blank
- B represents the average value of the absorbance (wavelength 345 nm) of the N-Ac-Ela aqueous solution. The average value of the absorbance of the blank is subtracted.
- -Turbidity measurement Chemically modified water-soluble elastin, elastin-derived polypeptide, and type I collagen are each dissolved in phosphate buffered saline (PBS solution) at 5 ° C. in consideration of physiological conditions.
- PBS solution phosphate buffered saline
- the turbidity was measured under the conditions of a wavelength of 400 nm, a temperature change of 0.5 ° C./min, and a nitrogen stream.
- the measuring instrument was a spectrophotometer with a Peltier temperature controller (JASCO: Ubest-50).
- porcine aortic tissue living tissue
- remove the unnecessary part by scraping off the low elastin content such as fat and muscle attached as pretreatment with a blade etc.
- the shredding process was performed 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 unnecessary protein. This operation was repeated 5 times, then washed with distilled water and drained by centrifugation (3,000 rpm, 5 minutes).
- porcine-derived high molecular weight water-soluble elastin To porcine-derived insoluble elastin was added 0.5N NaOH of 10 times its dry weight and stirred in an oil bath at 100 ° C. for 30 minutes. After the reaction, the solution was quickly cooled with ice and neutralized with acetic acid, hydrochloric acid or citric acid. Thereafter, dialysis is performed for 1 week using a dialysis membrane having a molecular weight cut off of 6,000 to 8,000, and the solution in the dialysis membrane is lyophilized to obtain a high molecular weight water solution derived from pigs having a main molecular weight of about 30,000 to 300,000. Sex elastin was obtained.
- N-Ac-Ela-O-Gly-OMe The N-acetyl water-soluble elastin (N-Ac-Ela) obtained above was dissolved in a small amount of dimethylformamide and dissolved in water. Sex carbodiimide (100 equivalents) was added and stirred at room temperature for 15 minutes. Thereafter, a small amount of dimethylformamide in which H-Gly-OMe ⁇ HCl (100 equivalents) and triethylamine (100 equivalents) were dissolved was added, and the mixture was stirred overnight at room temperature.
- N-Ac-Ela-O-Gly-OMe shows that the turbidity curve of N-Ac-Ela-O-Gly-OMe is reversible because the turbidity curve with increasing temperature and the turbidity curve with decreasing temperature almost coincide. From the results of FIG. 6 and FIGS. 1 and 2, N-Ac-Ela-O-Gly-OMe becomes cloudy when heated by coacervation and forms coacervate at 37 ° C. and pH 7.4 under cell culture conditions. It was suggested that it returned to the original transparent solution state at 20 ° C. or lower.
- the hardness of the coacervate was expressed as a load against indentation (MPa).
- MPa load against indentation
- a 1 mg / ml PBS solution of type I collagen was prepared (sterilized), 100 ⁇ l each was added onto the coacervate, and incubated for 1 hour (37 ° C. in 5% carbon dioxide gas) to prepare a collagen gel membrane. .
- 100 ⁇ l of human skin fibroblasts (2.0 ⁇ 10 4 cells / ml) suspended in DMEM medium supplemented with 10.0% fetal bovine serum were seeded on the collagen gel membrane of each well, and 5% carbon dioxide incubator. The culture was performed at 37 ° C. for 24 hours. The results of observing the state of the cells with an optical microscope are shown in FIGS.
- FIG. 10 schematically shows a state in which a collagen gel was prepared on N-Ac-Ela-O-Gly-OMe coacervate and fibroblasts were seeded on the gel. In this state, the cells are attached on the gel before adhering.
- 1 is a collagen gel
- 2 is a coacervate of N-Ac-Ela-O-Gly-OMe
- 3 is a fibroblast before adhesion.
- FIG. 11 is an optical micrograph showing that cells immediately after seeding (0 hour) are present on the collagen gel in an attached state (spherical) before adhesion.
- FIG. 11, 3 is a fibroblast before adhering.
- FIG. 12 is an optical micrograph showing that the fibroblasts cultured for 24 hours are present in a spindle-like state on the collagen gel and are adhered, stretched and proliferated.
- reference numeral 3 denotes fibroblasts that are adhered, spread and proliferate.
- a collagen gel is prepared on a coacervate of N-Ac-Ela-O-Gly-OMe, fibroblasts are seeded thereon, cultured for 24 hours to prepare a cell sheet, then cooled to 15 ° C. and 30
- the N-Ac-Ela-O-Gly-OMe coacervate was dissolved by incubating for 5 minutes, and the cell sheet composed of fibroblasts and collagen gel was peeled off. The state in which the cell sheet adhered, stretched and proliferated on the collagen gel peeled off was observed with the naked eye.
- FIG. 13 is a diagram schematically showing a state in which the N-Ac-Ela-O-Gly-OMe coacervate is dissolved and the cell sheet composed of collagen gel and fibroblasts is peeled off.
- 1 is a collagen gel
- 3 is a fibroblast that is adhered, stretched and proliferated
- 4 is a cell sheet
- 5 is a coacervate of N-Ac-Ela-O-Gly-OMe dissolved and disappeared. It represents the state.
- the coacervate of N-Ac-Ela-O-Gly-OMe was dissolved, and a cell sheet composed of fibroblasts and collagen gel was easily produced and collected in an intact state.
- N-Ac-Ela-O-Gly-OMe is dissolved in PBS solution (pH 7.4) to prepare 10 ml of a 30 mg / ml solution, sterilized through a filter-unit 0.22 ⁇ m sterilizing filter; 6 ml each was dispensed into a 6 cm diameter culture dish (coating amount was 38 g / m 2 ), incubated for 24 hours (in 60 ° C., 5% carbon dioxide gas), and separated into two layers. Thereafter, the upper equilibrium solution was removed, and the surface of the lower coacervate film (100 to 200 ⁇ m thick) was dried at 37 ° C. for about 10 minutes.
- VPGVG poly(VPGVG)
- VPGVG Poly (VPGVG) (1) by the active ester method- H-VPGVG-ONp.TFA (0.23 mmol) was dissolved in DMSO (0.5 ml), the pH was adjusted to 9 with NMM, and the mixture was stirred for 7 days to polymerize. Dialyzed using a dialysis membrane with a molecular weight cut off of 3,500, and lyophilized. The yield was 37% and the average molecular weight was about 17,000. In addition, the average molecular weight was calculated
- VPGVG poly (VPGVG) coacervate- Poly (VPGVG)
- PBS solution pH 7.4
- 30 mg / ml sterilized through a filter for sterilization with 0.22 ⁇ m Filter-Unit, and 96 ⁇ l each. It was dispensed into a well culture dish and incubated for 24 hours (60 ° C. in 5% carbon dioxide) to separate into two layers. Thereafter, the upper equilibrium solution was removed, and the surface of the lower coacervate was dried at 37 ° C. for about 10 minutes.
- a 1 mg / ml PBS solution of type I collagen was prepared (sterilized), 100 ⁇ l each was added onto the coacervate, and incubated for 1 hour (37 ° C. in 5% carbon dioxide gas) to prepare a collagen gel membrane.
- Human skin fibroblasts (2.0 ⁇ 10 4 cells / ml) suspended in DMEM medium supplemented with 10.0% fetal bovine serum were seeded on the collagen gel membrane of each well in an amount of 100 ⁇ l, and a 5% carbon dioxide incubator. -Cultivation was carried out at 37 ° C for 24 hours.
- FIG. 16 is an optical micrograph showing that the fibroblasts after 24 hours of culture are present in a spindle-like state on the collagen gel and are adhered, stretched and proliferated.
- reference numeral 3 denotes fibroblasts that are adhered, spread and proliferate.
- Any of the above polypeptides can be used as a temperature-responsive sheet.
- a living tissue or organ basically has a structure made of sheet-like cells, and is folded into various shapes to form three-dimensional tissues such as blood vessels and organs.
- a technique in which such a cell sheet can be produced by cell culture using an extracellular matrix as a scaffold, peeled off from a culture dish, and stacked is called cell sheet engineering.
- cell sheet engineering A technique in which such a cell sheet can be produced by cell culture using an extracellular matrix as a scaffold, peeled off from a culture dish, and stacked is called cell sheet engineering.
- a proteolytic enzyme for detachment, which damages the cells and the extracellular matrix.
- Chemical modification of water-soluble elastin, derivatives thereof Water-soluble elastin, or coacervates of elastin-derived polypeptides have been found to be useful for recovering intact cell sheets. Polypeptides can be used to recover cells in sheet form, which can be used in cell sheet engineering.
Abstract
Description
本発明者らは、上記課題は、具体的には、下記のような本発明の各態様によって達成されることを見いだした。
温度応答性シートは、第1アミン及び第2アミンの少なくとも一部をN-アセチル化すると共に、カルボキシル基の少なくとも一部をグリシンのメチルエステルとカップリングさせることが好ましい。
上記のN-アセチル化は、式(1)により規定される修飾率が80モル%以上であることが好ましい。
修飾率(モル%)=(1-B/A)×100 (1)
ここで、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し、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。
カルボキシル基の保護は、カルボキシル基の90モル%以上がグリシンのメチルエステルにより保護されることが好ましい。
本発明の温度応答性シートは、化学修飾した水溶性エラスチンが、pH7.4、温度37℃でコアセルベートを形成し、温度を20℃以下、好ましくは1~20℃、より好ましくは1~15℃に低下させると、該コアセルベートが溶解する性質を持つ。
また、水溶性エラスチンが低分子量フラクションを透析により除去した高分子量水溶性エラスチンであることが好ましい。
本発明の温度応答性シートは、細胞シート作製用に好ましく使用される。
上記の好ましい実施態様の組み合わせはさらに好ましい。
上記の製造方法は、温度応答性シートを形成する工程に引き続いて、前記温度応答性シート上に、細胞の足場となるゲル膜を形成する工程、を含むことが好ましい。足場となる膜は、いわゆる細胞外マトリックスよりなる群から選ばれたゲル膜であることが好ましい。足場となる膜は、具体的には、コラーゲン、フィブロネクチン、ラミニン、ポリリシン、及び、ゼラチン群から選ばれたゲル膜であることが好ましく、コラーゲン、ポリリシン、及び、ゼラチンよりなる群から選ばれたゲル膜がより好ましく、コラーゲンのゲル膜であることが特に好ましい。
上記の「細胞の足場となるゲル膜」は、コラーゲン等の細胞外マトリックスの主成分に、細胞接着・細胞増殖を促進する、フィブロネクチン、ラミニン、ビトロネクチン、テネイシン、トロンボスポンジン、エンタクチン、オステオポンチン、フォンビルブランド因子、フィブリノーゲン、コンドロイチン-6硫酸、デルマタン硫酸、ケラタン硫酸、ヘパラン硫酸、ヘパリン、ヒアルロン酸等の異種の細胞外マトリックスを任意成分として少量含有していてもよい。
図1及び図2を参照しながら、水溶性エラスチン、その誘導体である本発明の化学修飾した水溶性エラスチン(本発明において「化学修飾水溶性エラスチン」ともいう。)、又はエラスチン中のペプチド配列を有するポリペプチドのコアセルベーションについて説明する。
図1は、化学修飾水溶性エラスチン及び上記ポリペプチドのコアセルベーションを示す図である。図1中、Aに示すように、化学修飾水溶性エラスチン又はポリペプチドは15℃以下では透明な均一溶液である。同じく、Bに示すように、20℃以上に加熱すると、相転移を起こして平衡溶液とコアセルベート液滴からなる白濁状態になる。この白濁状態は冷却すると元の透明な均一溶液に戻る。Cに示すように、20℃以上でそのまま放置すると、コアセルベート液滴は互いに融合して大きな液滴になり、淡黄色の高粘性のコアセルベートとして沈層して、平衡溶液とコアセルベートの2層に分離する。この2層分離状態を冷却すると、コアセルベートは溶解して元の透明な均一溶液に戻る。
本発明において高分子量の水溶性エラスチンを使用することが好ましい、「高分子量」とは、水溶性エラスチンから比較的低分子(約5,000以下)の成分を除去したものを言う。区画分子量が、6,000~8,000の透析膜を用いた透析により、低分子量成分を除去することが好ましい。高分子量の水溶性エラスチンの主たる分子量は約1万以上であることが好ましく、約3~30万であることがより好ましい。
水不溶性エラスチンの部分加水分解に先立って、エラスチンを含む生体組織の細断処理、熱水、熱稀アルカリ水溶液処理、アセトン抽出等による脱脂処理、塩化ナトリウム可溶の不要タンパク質の抽出除去等を行うことが好ましい。
修飾率(モル%)=(1-B/A)×100 (1)
式中、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。
N-アセチル化以外のN-アシル化も同様の条件で光学的に定量することができる。
水溶性エラスチン中に含まれる第1アミン及び第2アミンが、90モル%以上N-アセチル化されるためには、水溶性エラスチン1g当たり無水酢酸を0.5~5mmol使用することが好ましい。
水溶性エラスチン中に含まれるカルボキシ基を、90モル%以上エステル化するためには、原料水溶性エラスチン1g当たり、カルボジイミド等のカップリング剤を0.3~1mmol使用することが好ましい。
図5に示すように、pHを5~9の範囲において変化させても濁度曲線が変化しないことから、カルボキシル基のほぼ全部が修飾されていると解釈される。
水溶性エラスチンのアミノ基をN-アシル化した後にカルボキシ基をエステル化する代わりに、水溶性エラスチンのカルボキシ基をエステル化した後にアミノ基をN-アシル化してもよい。
図4は、コラーゲンのゲル化を模式的に示した図である。コラーゲンゲルは細胞シート作製のための細胞の足場に用いられる。足場は、細胞シートの形状を保持するために使用される。細胞の足場は、当業者によく知られているように、正常な動物細胞(上皮細胞、内皮細胞、線維芽細胞、平滑筋細胞など)が生きて行くために必要な細胞外マトリックスを意味する。細胞外マトリックスの種類は、コラーゲン群、非コラーゲン性糖タンパク質群、エラスチン群、及び、プロテオグリカン群に大別され、コラーゲン、フィブロネクチン、ラミニン、ポリリシン、及び、ゼラチンが好ましい具体例として例示される。
以下に上記の各工程を説明する。
温度応答性シートを作製するための基材である支持体は、特に限定されず、細胞培養に悪影響のない、不活性な支持体が使用される。このような支持体として、通常の培養容器を構成するガラス、ポリスチレン(PS)等の樹脂が例示できる。
化学修飾水溶性エラスチンを含む温度応答性シートは、化学修飾水溶性エラスチンを主成分(90重量%以上)として含むことが好ましく、化学修飾水溶性エラスチンのみからなることがより好ましい。このシートの厚さは、nm~μmのオーダーであることが好ましく、50nm~500μmであることがより好ましい。言い換えると、0.01~100g/m2の乾燥塗設量とすることが好ましい。コアセルベートを形成させるためのインキュベート温度は40℃~80℃であることが好ましく、50℃~70℃であることがより好ましい。乾燥条件は35℃~40℃で5分~20分間乾燥させるのが好ましい。
コラーゲンゲル層の厚さは、約1~1,000μmであることが好ましく、約10~500μmであることがより好ましい。膜形成のためのインキュベート温度は30℃~40℃であることが好ましく、37℃付近であることがより好ましい。溶液の濃度は0.1mg/ml~10mg/mlであることが好ましく、0.5mg/ml~2mg/mlであることがより好ましい。
細胞シートは単層でも複層にしてもよい。複層の場合には、同一細胞でも、異種の細胞であってもよい。
この工程は、前記細胞の培養温度以下の条件で、前記温度応答性シートと前記細胞シートとを分離する工程である。「培養温度以下」とは、培養温度が37℃の場合、好ましくは、1~20℃、より好ましくは、10~15℃をいう。
エラスチン中のペプチド配列にはpoly(VPGVG)及びpoly(VPGG)が例示できる。これらのポリペプチドはヒト、ブタ、ウシ等の哺乳動物のエラスチンに共通して存在するペプチドであり、毒性や免疫学的等の面で極めて問題が少ないポリペプチドである。またpoly(VPGVG)の順列入れ替えポリペプチドであるpoly(PGVGV)、poly(GVGVP)、poly(VGVPG)及びpoly(GVPGV)、poly(VPGG)の順列入れ替えポリペプチドであるpoly(PGGV)、poly(GGVP)及びpoly(GVPG)もエラスチン由来ポリペプチドに含まれる。さらにpoly(VPGVG)の置換体であるpoly(X1PX2X3X4)、poly(PGVGV)の置換体であるpoly(PX2X3X4X1)、poly(GVGVP)の置換体であるpoly(X2X3X4X1P)、poly(VGVPG)の置換体であるpoly(X3X4X1PX2)、poly(GVPGV)の置換体であるpoly(X4X1PX2X3)、poly(VPGG)の置換体であるpoly(X1PX2X3)、poly(PGGV)の置換体であるpoly(PX2X3X1)、poly(GGVP)の置換体であるpoly(X2X3X1P)、poly(GVPG)の置換体であるpoly(X3X1PX2)も本発明のポリペプチドに含まれる。本発明においてポリペプチドとは、分子量が約3,000以上、好ましくは5,000~100,000のものを意味する。またX1、X2、X3、X4はタンパク質を構成する約20種類のアミノ酸のいずれでもよい。
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%SDS(ドデシル硫酸ナトリウム)1ml、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。
式中、Aは、エラスチン水溶液の吸光度(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ものを表し、Bは、N-Ac-Ela水溶液の吸光度(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ものを表す。
化学修飾水溶性エラスチン、エラスチン由来のポリペプチド、及びI型コラーゲンをそれぞれ生理的条件下を考慮してリン酸緩衝液生理食塩水(phosphate buffered saline;PBS溶液)に5℃において溶解し、その溶液を、波長400nm、温度変化0.5℃/分、窒素気流下の条件で濁度測定を行った。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(JASCO: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可溶なエラスチン以外の不要タンパク質やコラーゲンを抽出により除去した。
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-NaOHを加え、100℃の油浴中で30分撹拌した。反応後、溶液を速やかに氷冷し、酢酸、塩酸又はクエン酸で中和した。その後、分画分子量6,000~8,000の透析膜を用いて1週間透析し、透析膜内の溶液を凍結乾燥して、主たる分子量が約3~30万であるブタ由来の高分子量水溶性エラスチンを得た。
下記の手順に従って、ブタ由来の高分子量水溶性エラスチンのN-アセチル化を行い、次いで、アミノ酸(グリシン)メチルエステルを用いてカップリングを行い、化学修飾したブタ由来の高分子量水溶性エラスチン(N-Ac-Ela-O-Gly-OMe)を作製した。
前記で得られたブタ由来高分子量水溶性エラスチンを少量のトリフルオロエタノールに溶解したものに、ピリジン(100当量)と無水酢酸(100当量)を加え、室温で撹拌した。ニンヒドリン試験でアセチル化が定量的に進行したことを確認した後、ロータリーエバポレーターで減圧濃縮した。このN-アセチル化は、TNBS法よりアミノ基等の修飾率が95モル%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等を除去し、凍結乾燥してN-アセチル水溶性エラスチンを得た。TNBS法による修飾率は97モル%であった。
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に溶解し、水溶性カルボジイミド(100当量)を加えて室温で15分間撹拌した。その後、H-Gly-OMe・HCl(100当量)及びトリエチルアミン(100当量)を溶かした少量のジメチルホルムアミドを加え、一昼夜室温で撹拌した。次いで真空ポンプで減圧濃縮し、1週間透析して溶媒や未反応試薬等を除去し、凍結乾燥して、化学修飾水溶性エラスチン(N-Ac-Ela-O-Gly-OMe )を得た。
前記で得られたN-Ac-Ela-O-Gly-OMe の1.0mgをpH5.0、pH7.4、pH9.0のPBS溶液にそれぞれに5℃下で溶解して、5~60℃の温度範囲、0.5℃/分の温度上昇で、波長400nmでの濁度を測定した。その結果を図5に示した。図5より、N-Ac-Ela-O-Gly-OMe(1.0mg/ml)のpH5.0、pH7.4、pH9.0での濁度曲線は、酸性、中性、アルカリ性のどの条件でもほとんど同じ曲線を与える結果であった。この結果から、N-アセチル化によるアミノ基の保護に加えて、H-Gly-OMeとのカップリングによるカルボキシル基の修飾によって、水溶性エラスチンの荷電がなくなったことがわかり、ほぼ定量的にN-Ac-Ela-O-Gly-OMeが合成できたことが確認された。
N-Ac-Ela-O-Gly-OMeを、5℃下でPBS溶液(pH7.4)に溶解して30mg/mlの溶液を作製し、5~25℃の温度範囲、窒素気流下で0.5℃/分の温度変化で、温度上昇及び温度下降における濁度測定を行った。その結果を図6に示した。図6よりN-Ac-Ela-O-Gly-OMeの濁度曲線は、温度上昇に伴う濁度曲線と温度下降に伴う濁度曲線がほぼ一致し、可逆的であることがわかった。この図6の結果と図1及び2より、N-Ac-Ela-O-Gly-OMeはコアセルベーションにより、加熱すると白濁し、細胞培養条件下の37℃、pH7.4でコアセルベートを形成し、20℃以下で元の透明な溶液状態に戻ることが示唆された。
N-Ac-Ela-O-Gly-OMeを5℃においてPBS溶液(pH7.4)に溶解させて、バイアル瓶の中で200mg/mlに調製した。次いで、50℃に加熱すると白濁し、その温度で24時間静置すると2層に分離した。上層の平衡溶液を取り除き、下層のコアセルベートの表面を約10分間乾燥させた後、25℃と37℃に温度を保持したままRHEONER-II-CREEP-METER- RE2-3305B-YAMADENを用いて押し込み試験を行った。コアセルベートの硬さは押し込みに対する荷重(MPa)で表した。その結果を図7に示した。図7より、N-Ac-Ela-O-Gly-OMeのコアセルベートは、25℃に比べて高い温度の37℃では硬くなることが確認された。即ち、コアセルベートは、細胞培養条件下の37℃では硬い状態を保持しているが、25℃にすると柔らかくなり、溶けやすい状態になることが分かった。また15℃ではコアセルベートが溶解し、測定できなかった。
I型コラーゲンの1mg/mlのPBS溶液(pH7.4)を5℃下で作製し、5℃~40℃の温度範囲において、窒素気流下で0.5℃/分の温度変化で温度上昇及び温度下降における濁度測定を行った。その結果を図8に示した。図8より、I型コラーゲンの濁度曲線は、温度上昇に伴う濁度曲線と温度下降に伴う濁度曲線が一致しないで、不可逆的であることが分かった。この図8の結果と図3及び4より、I型コラーゲンは、温度上昇に伴ってゾルからゲルに変化し、細胞培養条件下の37℃、pH7.4ではゲルを形成し、冷却しても元のゾル状態に戻らないで、ゲル化したままであることが示された。
I型コラーゲンの0.5mg/ml、1.0mg/ml、1.5mg/ml、2.0mg/mlのPBS溶液(pH7.4)の50μlずつを、96ウェル培養皿に加え、1時間インキュベート(37℃、5%炭酸ガス中)して作製したコラーゲンゲル上に、0.5%ウシ胎児血清を添加したDulbecco's-Modified-Eagle-Medium(DMEM)培地に懸濁した、ヒト皮膚線維芽細胞2.0×104cells/mlの100μlを各々のウェルに播種した。2日間培養(37℃、5%炭酸ガス中)した後、培地交換を行い、さらに2日間培養を続けて細胞数をカウントした(×400、3視野)。その結果を図9に示した。図9より、コラーゲンゲル量が多くなるにつれて、細胞数が増加することが分かった。
N-Ac-Ela-O-Gly-OMeをPBS溶液(pH7.4)に溶解させ30mg/mlに調製し、Filter-Unit 0.22μmの滅菌用フィルターを通して滅菌し、100μlずつ96ウェル培養皿に分注し、24時間インキュベート(60℃、5%炭酸ガス中)して2層に分離させた。その後、上層の平衡溶液を取り除き、下層のコアセルベートの表面を約10分間、37℃で乾燥させた。次いで、I型コラーゲンの1mg/mlのPBS溶液を作製し(滅菌済み)、100μlずつコアセルベート上に加え、1時間インキュベート(37℃、5%炭酸ガス中)することでコラーゲンゲルの膜を作製した。10.0%ウシ胎児血清を添加したDMEM培地で懸濁した、ヒト皮膚線維芽細胞2.0×104cells/mlを各ウェルのコラーゲンゲル膜上に100μlずつ播種し、5%炭酸ガスインキュベーター中で37℃、24時間培養を行った。そのときの細胞の状態を光学顕微鏡で観察した結果を図11~図12に示した。
N-Ac-Ela-O-Gly-OMeのコアセルベート上にコラーゲンゲルを作製し、その上に線維芽細胞を播種し、24時間培養して細胞シートを作製した後に、15℃に冷却して30分間インキュベートすることでN-Ac-Ela-O-Gly-OMeのコアセルベートが溶解し、線維芽細胞・コラーゲンゲルからなる細胞シートを剥離した。コラゲーンゲル上で接着、伸展、増殖した細胞シートが剥離している状態は肉眼で観察できた。図13は、N-Ac-Ela-O-Gly-OMeのコアセルベートが溶解し、コラーゲンゲル及び線維芽細胞からなる細胞シートが剥離している状態を模式的に示した図である。図13において、1はコラーゲンゲル、3は接着、伸展、増殖している線維芽細胞、4は細胞シート、5はN-Ac-Ela-O-Gly-OMeのコアセルベートが溶解して消失している状態を表している。このように温度を下げることにより、N-Ac-Ela-O-Gly-OMeのコアセルベートが溶解し、線維芽細胞・コラーゲンゲルからなる細胞シートが、無傷の状態で容易に製造・回収された。
化学修飾水溶性エラスチンと同様に温度応答性シートに用いることができるエラスチン由来のポリペプチドの製造について、ポリペプチドの一つであるpoly(VPGVG)の製造(ポリマー化)例を説明する(図14参照)。
H-VPGVG-ONp・TFA(0.23mmol)をDMSO(0.5ml)に溶解し、NMMでpHを9にし、7日間撹拌してポリマー化した。分画分子量3,500の透析膜を用いて透析し、凍結乾燥した。収率は37%、平均分子量は約17,000であった。なお、平均分子量は、定法により電気泳動法を用いて、分子量マーカーに基づく標準曲線から求めた。
H-VPGVG-OH・TFA(0.37mmol)をDMSO(0.5ml)に溶解し、HOBt・H2O(0.37mmol)を加え、10分後に水溶性カルボジイミド(0.74mmol)を加え、NMMでpHを9にし、7日間撹拌してポリマー化した。分画分子量3,500の透析膜を用いて透析し、凍結乾燥した。収率は61%、平均分子量は約20,000であった。
H-VPGVG-OH・TFA(0.37mmol)を蒸留水(0.5ml)に溶解し、Sulfo-NHS(0.37mmol)を加え、ついで水溶性カルボジイミド(0.37mmol)を加え、NMMでpHを9にし、7日間撹拌してポリマー化した。分画分子量3,500の透析膜を用いて透析し、凍結乾燥した。収率は6.3%、平均分子量は約22,000であった。
H-VPGVG-OH・TFA(0.37mmol)をピリジン(0.5ml)に溶解し、Bis-PNPC(0.11mmol)を加え、NMMでpHを9にし、7日間撹拌してポリマー化した。分画分子量3,500の透析膜を用いて透析し、凍結乾燥した。収率は16%、平均分子量は約14,000であった。
前記の活性エステル法によって製造したpoly(VPGVG)(1)を、5℃下でPBS溶液(pH7.4)に溶解して30mg/mlの溶液を作製し、5~65℃の温度範囲、窒素気流下で0.5℃/分の温度変化で、温度上昇及び温度下降における濁度測定を行った。その結果を図15に示した。図15よりpoly(VPGVG)の濁度曲線は、温度上昇に伴う濁度曲線と温度下降に伴う濁度曲線がほぼ一致し、可逆的であることがわかった。この図15の結果と図1及び2より、poly(VPGVG)はコアセルベーションにより、加熱すると白濁し、細胞培養条件下の37℃、pH7.4でコアセルベートを形成し、20℃以下で元の透明な溶液状態に戻ることが示唆された。
前記の活性エステル法によって製造したpoly(VPGVG)(1)をPBS溶液(pH7.4)に溶解させ30mg/mlに調製し、Filter-Unit 0.22μmの滅菌用フィルターを通して滅菌し、100μlずつ96ウェル培養皿に分注し、24時間インキュベート(60℃、5%炭酸ガス中)して2層に分離させた。その後、上層の平衡溶液を取り除き、下層のコアセルベートの表面を約10分間、37℃で乾燥させた。次いで、I型コラーゲンの1mg/mlのPBS溶液を作製し(滅菌済み)、100μlずつコアセルベート上に加え、1時間インキュベート(37℃、5%炭酸ガス中)することでコラーゲンゲル膜を作製した。10.0%ウシ胎児血清を添加したDMEM培地で懸濁した、ヒト皮膚線維芽細胞2.0×104cells/mlを各ウェルのコラーゲンゲル膜上に100μlずつ播種し、5%炭酸ガスインキュベータ―中で37℃、24時間培養を行った。図16は24時間培養後の線維芽細胞が、コラーゲンゲル上に紡錘状の状態で存在し、接着、伸展、増殖していることを示す光学顕微鏡写真である。図16において、3は接着、伸展、増殖している線維芽細胞である。
前記に示すように細胞シートを作製した後に、15℃に冷却して30分間インキュベートすることでpoly(VPGVG)のコアセルベートが溶解し、線維芽細胞・コラーゲンゲルからなる細胞シートを剥離した。コラゲーンゲル上で接着、伸展、増殖した細胞シートが剥離している状態は肉眼で観察できた。その結果は図13に示した結果と同様の結果であった。このように温度を下げることにより、poly(VPGVG)のコアセルベートが溶解し、線維芽細胞・コラーゲンゲルからなる細胞シートが、無傷の状態で容易に製造・回収された。
2 N-Ac-Ela-O-Gly-OMeのコアセルベート
3 線維芽細胞
4 細胞シート
5 N-Ac-Ela-O-Gly-OMeのコアセルベートが溶解して消失している状態
Claims (12)
- 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アミンの少なくとも一部を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少なくとも一部をアミノ酸のアルキルエステルとカップリングさせて得られる化学修飾した水溶性エラスチンを含むことを特徴とする温度応答性シート。
- 第1アミン及び第2アミンの少なくとも一部をN-アセチル化すると共に、カルボキシル基の少なくとも一部をグリシンのメチルエステルとカップリングさせて得られる、請求項1に記載の温度応答性シート。
- 式(1)により規定される修飾率が80モル%以上となるようにN-アセチル化された、請求項2に記載の温度応答性シート。
修飾率(モル%)=(1-B/A)×100 (1)
ここで、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し、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。 - カルボキシル基の90モル%以上がグリシンのメチルエステルとカップリングした、請求項2又は3に記載の温度応答性シート。
- 化学修飾した水溶性エラスチンが、pH7.4、温度37℃でコアセルベートを形成し、温度を15℃に低下させると、該コアセルベートが溶解する性質を持つ、請求項1~4いずれか1つに記載の温度応答性シート。
- 水溶性エラスチンが低分子量フラクションを透析により除去した高分子量水溶性エラスチンである、請求項1~5いずれか1つに記載の温度応答性シート。
- 細胞培養用である、請求項1~6いずれか1つに記載の温度応答性シート。
- 請求項1~7いずれか1つに記載の温度応答性シートを支持体上に形成する工程、前記温度応答性シート上に細胞の足場となる膜を作製する工程、前記足場となる膜上で特定の細胞を培養して細胞シートを作製する工程、次いで、該細胞の培養温度以下の1~20℃において、前記温度応答性シートと前記細胞シートとを分離する工程を含むことを特徴とする細胞シートの製造方法。
- 前記足場となる膜が、細胞外マトリックスよりなる群から選ばれたゲル膜である、請求項8に記載の細胞シートの製造方法。
- 前記足場となる膜が、コラーゲン、フィブロネクチン、ラミニン、ポリリシン、及び、ゼラチンよりなる群から選ばれたゲル膜である請求項8又は9に記載の細胞シートの製造方法。
- エラスチン中のペプチド配列を化学合成したポリペプチド。
- 請求項11に記載のポリペプチドを主成分として含む温度応答性シート。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/703,318 US9090869B2 (en) | 2010-06-10 | 2011-06-09 | Temperature responsive sheet that displays reversible properties and cell sheet production method using same |
JP2012519427A JP5870408B2 (ja) | 2010-06-10 | 2011-06-09 | 可逆的な性質を示す温度応答性シートとそれを用いた細胞シートの製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-132976 | 2010-06-10 | ||
JP2010132976 | 2010-06-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011155565A1 true WO2011155565A1 (ja) | 2011-12-15 |
Family
ID=45098169
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/063265 WO2011155565A1 (ja) | 2010-06-10 | 2011-06-09 | 可逆的な性質を示す温度応答性シートとそれを用いた細胞シートの製造方法 |
Country Status (3)
Country | Link |
---|---|
US (1) | US9090869B2 (ja) |
JP (1) | JP5870408B2 (ja) |
WO (1) | WO2011155565A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015007034A (ja) * | 2013-05-29 | 2015-01-15 | Jsr株式会社 | アミド化合物の合成方法、および該方法で得られるアミド化合物 |
JP2015013850A (ja) * | 2013-04-30 | 2015-01-22 | 国立大学法人九州工業大学 | ペプチドおよびその自己集合方法、その集合体、これらを用いた細胞培養基材、並びに、細胞シートの製造方法 |
WO2018029762A1 (ja) * | 2016-08-08 | 2018-02-15 | 国立大学法人 九州工業大学 | 経皮吸収素材、並びに、経皮吸収式化粧品、及び、経皮吸収式薬剤 |
WO2019189786A1 (ja) * | 2018-03-29 | 2019-10-03 | 凸版印刷株式会社 | 細胞培養用シート並びに三次元組織体及びその製造方法 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MX2018001511A (es) | 2015-08-04 | 2018-08-01 | Univ Duke | Polimeros furtivos desordenados de forma intrinseca codificados geneticamente para suministro y metodos para usar los mismos. |
US11752213B2 (en) | 2015-12-21 | 2023-09-12 | Duke University | Surfaces having reduced non-specific binding and antigenicity |
WO2017210476A1 (en) | 2016-06-01 | 2017-12-07 | Duke University | Nonfouling biosensors |
CN109890833A (zh) * | 2016-09-14 | 2019-06-14 | 杜克大学 | 用于递送亲水性药物的基于三嵌段多肽的纳米粒子 |
US11155584B2 (en) | 2016-09-23 | 2021-10-26 | Duke University | Unstructured non-repetitive polypeptides having LCST behavior |
US11648200B2 (en) | 2017-01-12 | 2023-05-16 | Duke University | Genetically encoded lipid-polypeptide hybrid biomaterials that exhibit temperature triggered hierarchical self-assembly |
US11554097B2 (en) | 2017-05-15 | 2023-01-17 | Duke University | Recombinant production of hybrid lipid-biopolymer materials that self-assemble and encapsulate agents |
US11680083B2 (en) | 2017-06-30 | 2023-06-20 | Duke University | Order and disorder as a design principle for stimuli-responsive biopolymer networks |
US20210115377A1 (en) | 2018-04-27 | 2021-04-22 | Toppan Printing Co., Ltd. | Extracellular-matrix-containing composition, temporary scaffold for three-dimensional tissue formation, three-dimensional tissue formation agent, and method for recovering cells from three-dimensional tissue |
WO2020028806A1 (en) | 2018-08-02 | 2020-02-06 | Duke University | Dual agonist fusion proteins |
US11512314B2 (en) | 2019-07-12 | 2022-11-29 | Duke University | Amphiphilic polynucleotides |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006046626A1 (ja) * | 2004-10-29 | 2006-05-04 | Kyushu Institute Of Technology | 水溶性エラスチンとその製造方法及びそれを含む食品と医薬 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE524541T1 (de) | 2000-07-21 | 2011-09-15 | Cellseed Inc | Kultivierte epidermale zellschicht, laminierte kultivierte hautschicht und verfahren zu deren herstellung |
EP1748064B1 (en) | 2004-04-25 | 2019-04-17 | CellSeed Inc. | Cultured periodontal ligament cell sheet, process for producing the same and method of use thereof |
-
2011
- 2011-06-09 US US13/703,318 patent/US9090869B2/en not_active Expired - Fee Related
- 2011-06-09 WO PCT/JP2011/063265 patent/WO2011155565A1/ja active Application Filing
- 2011-06-09 JP JP2012519427A patent/JP5870408B2/ja not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006046626A1 (ja) * | 2004-10-29 | 2006-05-04 | Kyushu Institute Of Technology | 水溶性エラスチンとその製造方法及びそれを含む食品と医薬 |
Non-Patent Citations (3)
Title |
---|
MIE, M. ET AL.: "Novel extracellular matrix for cell sheet recovery using genetically engineered elastin-like protein", JOURNAL OF BIOMEDICAL MATERIALS RESEARCH. PART B. APPLIED BIOMATERIALS, vol. 86, no. 1, 2007, pages 283 - 290 * |
YASUNORI MIZUSHIMA ET AL.: "Kokino Saibo Sheet Kochiku no Tameno Jinko Tanpakushitsu Zairyo no Kaihatsu", THE CHEMICAL SOCIETY OF JAPAN DAI 86 SHUNKI NENKAI KOEN YOKOSHU II, 2006, pages 899, 4G4-11 * |
YOSUKE MAEKAWA ET AL.: "Kagaku Shushoku Suiyosei Elastin Oyobi I-gata Collagen Kyozon Jotai ni Okeru Jiko Shugo Tokusei", KITAKYUSHU IKO GAKUJUTSUSHA KYOKAISHI, vol. 20, April 2010 (2010-04-01), pages 25 - 28 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015013850A (ja) * | 2013-04-30 | 2015-01-22 | 国立大学法人九州工業大学 | ペプチドおよびその自己集合方法、その集合体、これらを用いた細胞培養基材、並びに、細胞シートの製造方法 |
JP2015007034A (ja) * | 2013-05-29 | 2015-01-15 | Jsr株式会社 | アミド化合物の合成方法、および該方法で得られるアミド化合物 |
WO2018029762A1 (ja) * | 2016-08-08 | 2018-02-15 | 国立大学法人 九州工業大学 | 経皮吸収素材、並びに、経皮吸収式化粧品、及び、経皮吸収式薬剤 |
WO2019189786A1 (ja) * | 2018-03-29 | 2019-10-03 | 凸版印刷株式会社 | 細胞培養用シート並びに三次元組織体及びその製造方法 |
JPWO2019189786A1 (ja) * | 2018-03-29 | 2021-03-25 | 凸版印刷株式会社 | 細胞培養用シート並びに三次元組織体及びその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
JP5870408B2 (ja) | 2016-03-01 |
JPWO2011155565A1 (ja) | 2013-08-01 |
US20130130384A1 (en) | 2013-05-23 |
US9090869B2 (en) | 2015-07-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5870408B2 (ja) | 可逆的な性質を示す温度応答性シートとそれを用いた細胞シートの製造方法 | |
JP4064435B2 (ja) | コラーゲンゲルおよびその製造方法 | |
Li et al. | Recruitment of multiple cell lines by collagen-synthetic copolymer matrices in corneal regeneration | |
Zuber et al. | Collagen based polyurethanes—A review of recent advances and perspective | |
EP1403304B1 (en) | Crosslinked elastin and processes for its production | |
AU670030B2 (en) | Water insoluble derivatives of polyanionic polysaccharides | |
JP4463702B2 (ja) | 伸縮性コラーゲン成形体、その製造方法および用途 | |
CA2928727C (en) | Cross-linked resilin-containing materials | |
JPH02191629A (ja) | グラフト化ペプチド共重合体 | |
US6235726B1 (en) | Water insoluble derivatives of polyanionic polysaccharides | |
WO2004085606A1 (ja) | 細胞培養基質および細胞接着蛋白質またはペプチドの固相化標品 | |
US20100190704A1 (en) | Structure comprising chitosan and collagen | |
JP5935094B2 (ja) | 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 | |
JP2002541070A (ja) | メルカプト官能基をグラフトすることで改変したコラーゲンペプチド、それを得る方法および生体材料としてのその使用 | |
Cabello et al. | Elastin-like materials for tissue regeneration and repair | |
JP5875761B2 (ja) | コラーゲン線維ゲルおよびその用途 | |
Rodríguez-Cabello et al. | Recombinamers: combining molecular complexity with diverse bioactivities for advanced biomedical and biotechnological applications | |
JP2001527451A (ja) | 細胞結合活性を有するコラーゲン様ポリマー | |
JP5497449B2 (ja) | 生体高分子およびポリペプチドの化学修飾方法 | |
AU2022332707A1 (en) | Collagen biomaterial derived from abalone | |
US8263135B2 (en) | Process for isolating biomaterial from tissue and an isolated biomaterial extract prepared therefrom | |
FR3035107A1 (fr) | Procede de preparation d'hydrogel a partir d'acide hyaluronique modifie et de collagene de type i | |
Li et al. | Effect of Polymer Topology and Residue Chirality on Biodegradability of Polypeptide Hydrogels | |
KR20170075723A (ko) | 글리코사미노글리칸 및 단백질을 함유하는 조성물 | |
US8389010B2 (en) | Stretchable collagen material and manufacturing method and use thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11792522 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012519427 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13703318 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 11792522 Country of ref document: EP Kind code of ref document: A1 |