WO2017170343A1 - 細胞シートを含有する積層体、心疾患治療剤および細胞シート積層用フィルム - Google Patents
細胞シートを含有する積層体、心疾患治療剤および細胞シート積層用フィルム Download PDFInfo
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- A61K35/12—Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
- A61K35/34—Muscles; Smooth muscle cells; Heart; Cardiac stem cells; Myoblasts; Myocytes; Cardiomyocytes
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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- A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
- A61K47/42—Proteins; Polypeptides; Degradation products thereof; Derivatives thereof, e.g. albumin, gelatin or zein
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- 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
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- 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
- A61L27/222—Gelatin
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- 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
- A61L27/36—Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix
- A61L27/3641—Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix characterised by the site of application in the body
- A61L27/367—Muscle tissue, e.g. sphincter
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- 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
- A61L27/36—Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix
- A61L27/38—Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix containing added animal cells
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- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/40—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material
- A61L27/44—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having a macromolecular matrix
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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]
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L89/00—Compositions of proteins; Compositions of derivatives thereof
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- 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
- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/60—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a special physical form
- A61L2300/64—Animal cells
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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
- A61L2430/00—Materials or treatment for tissue regeneration
- A61L2430/20—Materials or treatment for tissue regeneration for reconstruction of the heart, e.g. heart valves
Definitions
- the present invention relates to a laminate composed of a cell sheet and a polymer film.
- the present invention also relates to a therapeutic agent for heart disease comprising the above laminate.
- the invention further relates to films for cell sheet lamination.
- Patent Document 1 forms a cell sheet substantially without proliferation for the purpose of providing a production method using a cell culture solution that does not contain a production process-derived impurity component that interferes with clinical application.
- a method of producing a cell sheet has been described which comprises culturing cells at a high density in a cell culture medium free of an effective amount of growth factor.
- Patent Document 2 describes genetically modified gelatin that is particularly useful for several applications involving cell attachment, such as cell culture operations and applications involving cell culture of anchorage-dependent cells, as well as a variety of medical applications. It is done.
- An object of the present invention is to provide a laminate containing a cell sheet which is strong and easy to handle at the time of transplantation or transportation.
- An object of the present invention is to provide a therapeutic agent for heart disease and a film for cell sheet lamination using the above laminate.
- the inventors of the present invention laminated the biocompatibility polymer film of 500 ⁇ g / cm 2 to 10 mg / cm 2 on the cell sheet to obtain strength and handling performance of the cell sheet. It has been found that it can be enhanced, and the present invention has been completed. According to the present invention, the following inventions are provided.
- a laminate comprising a biocompatibility polymer film of 500 ⁇ g / cm 2 to 10 mg / cm 2 and a cell sheet disposed on at least one surface of the biocompatibility polymer film.
- the biocompatible polymer film satisfies the following formula 1.
- Formula 1 (film thickness upon swelling / film thickness upon drying) ⁇ 100 ⁇ ⁇ 27.5 ⁇ film thickness upon drying + 880 However, the unit of film thickness at the time of swelling and film thickness at the time of drying is ⁇ m.
- Formula 2 (film thickness upon swelling / film thickness upon drying) ⁇ 100 ⁇ ⁇ 27.5 ⁇ film thickness upon drying + 962.5 However, the unit of film thickness at the time of swelling and film thickness at the time of drying is ⁇ m.
- Formula 3 (film thickness when swollen / film thickness when dried) ⁇ 100 However, the unit of film thickness at the time of swelling and film thickness at the time of drying is ⁇ m.
- [5] The laminate according to any one of [1] to [4], wherein the dry film thickness of the biocompatible polymer film is 5 to 200 ⁇ m.
- Formula 4 A-[(Gly-X-Y) n ] m- B
- A represents any amino acid or amino acid sequence
- B represents any amino acid or amino acid sequence
- n pieces of X each independently represent any of amino acids
- n pieces of Y each independently represent amino acids
- n represents an integer of 3 to 100
- m represents an integer of 2 to 10.
- the n pieces of Gly-X-Y may be the same or different.
- Formula 5 Gly-Ala-Pro-[(Gly-X-Y) 63 ] 3 -Gly
- 63 Xs each independently represent any of amino acids
- 63 Ys each independently represent any of amino acids.
- the 63 Gly-X-Y groups may be the same or different.
- the laminate according to any one of [8] to [11], wherein the recombinant gelatin has the amino acid sequence set forth in SEQ ID NO: 1.
- a therapeutic agent for heart disease comprising the laminate according to any one of [1] to [12].
- a film for laminating a cell sheet comprising a biocompatibility polymer film of 500 ⁇ g / cm 2 to 10 mg / cm 2 .
- the strength and handling performance of the cell sheet can be enhanced.
- the agent for treating heart disease of the present invention can treat heart disease.
- the film for cell sheet lamination of the present invention is useful in the production of the laminate of the present invention.
- FIG. 1 shows the result of the handling performance evaluation of the polymer film.
- FIG. 2 shows a schematic view of a test system and test results for a protein permeation test of a polymer film.
- FIG. 3 shows the results of the protein permeation test of the polymer film.
- FIG. 4 shows the results of plotting the protein permeability of the polymer film on a graph of the swelling ratio and the film thickness at the time of drying.
- FIG. 5 shows changes in left ventricular space area change rate (FAC) after transplantation into an infarct model.
- FIG. 6 shows the results of skeletal myoblasts confirmed by immunostaining of myosin heavy chain (MHC).
- MHC myosin heavy chain
- the laminate of the present invention is a laminate comprising a biocompatibility polymer film of 500 ⁇ g / cm 2 to 10 mg / cm 2 and a cell sheet disposed on at least one surface of the biocompatibility polymer film. is there.
- the biocompatible polymer film is also referred to as a polymer film.
- a laminate containing one bioaffinity polymer film and one cell sheet ie, a cell sheet is formed only on one surface of the bioaffinity polymer film
- Laminates present, as well as laminates in which one biocompatibility polymer film is present between two cell sheets ie, lamination in which cell sheets are present on both surfaces of the biocompatibility polymer film) Body
- one biocompatibility polymer film is present between two cell sheets
- the density of the biocompatible polymer film used in the present invention is 500 ⁇ g / cm 2 to 10 mg / cm 2 . By setting the density within the above range, it is possible to manufacture a laminate having sufficient strength.
- the density of the biocompatible polymer film is preferably 500 ⁇ g / cm 2 to 5.0 mg / cm 2 , more preferably 500 ⁇ g / cm 2 to 2.0 mg / cm 2 .
- the density of the biocompatible polymer film is calculated by "coating mass / coating area" at the time of preparation.
- the applied mass means the mass of the applied biocompatible polymer.
- the biocompatible polymer film used in the present invention preferably satisfies the following formula 1.
- Formula 1 (film thickness upon swelling / film thickness upon drying) ⁇ 100 ⁇ ⁇ 27.5 ⁇ film thickness upon drying + 880
- the unit of film thickness at the time of swelling and film thickness at the time of drying is ⁇ m.
- the handling performance of the biocompatible polymer film is further improved, which is preferable.
- a biocompatible polymer film satisfying the above formula 1 And the handling performance is further improved.
- a biocompatible polymer film is produced by drying at room temperature (25 ° C.), a biocompatible polymer film not satisfying the above-mentioned formula 1 is obtained.
- the biocompatible polymer film used in the present invention more preferably satisfies the following formula 2.
- Formula 2 (film thickness upon swelling / film thickness upon drying) ⁇ 100 ⁇ ⁇ 27.5 ⁇ film thickness upon drying + 962.5
- the unit of film thickness at the time of swelling and film thickness at the time of drying is ⁇ m.
- the dry film thickness is obtained by measuring the thickness of the dried biocompatible polymer film with a micrometer (such as Mitutoyo Soft Touch Micro CLM).
- the film thickness upon swelling is obtained by measuring the thickness of the biocompatible polymer film sufficiently moistened with water for injection using a micrometer.
- the swelling ratio represented by the following formula 3 of the biocompatible polymer film used in the present invention is preferably 230% or more.
- Formula 3 (film thickness when swollen / film thickness when dried) ⁇ 100
- the unit of film thickness at the time of swelling and film thickness at the time of drying is ⁇ m.
- the swelling ratio represented by the formula 3 By setting the swelling ratio represented by the formula 3 to 230% or more, the permeability of a protein (a protein of 66 kDa in the example) can be improved. That is, it is preferable because coexistence of prevention of cell infiltration and permeation of protein (nutrient component etc.) can be achieved.
- the swelling ratio represented by the formula 3 is more preferably 250% or more, still more preferably 270% or more, and particularly preferably 300% or more. Although the upper limit of the swelling ratio shown by Formula 3 is not specifically limited, Generally it is 1000% or less.
- the dry film thickness of the biocompatible polymer film is not particularly limited, but is preferably 5 to 200 ⁇ m, more preferably 10 to 100 ⁇ m, still more preferably 20 to 50 ⁇ m, and particularly preferably 20 to 40 ⁇ m It is.
- the wet film thickness of the biocompatible polymer film is not particularly limited, but preferably 50 to 500 ⁇ m. By setting it as said range, the curvature of a bioaffinity polymer film can be prevented.
- the wet film thickness of the biocompatible polymer film is more preferably 50 to 300 ⁇ m, and still more preferably 100 to 300 ⁇ m.
- Biocompatible polymer Biocompatibility means that when it comes into contact with a living body, it does not cause significant adverse reactions such as long-term and chronic inflammatory reactions.
- the biocompatible polymer used in the present invention is not particularly limited as long as it is degraded in the living body as long as it has an affinity to the living body, but is preferably a biodegradable polymer.
- Specific examples of non-biodegradable polymers include polytetrafluoroethylene (PTFE), polyurethane, polypropylene, polyester, vinyl chloride, polycarbonate, acrylic, silicone, and MPC (2-methacryloyloxyethyl phosphorylcholine).
- biodegradable polymers include naturally occurring peptides, recombinant peptides, and polypeptides such as chemically synthesized peptides (eg, gelatin described below), polylactic acid, polyglycolic acid, lactic acid / glycolic acid Copolymers (PLGA), hyaluronic acid, glycosaminoglycans, proteoglycans, chondroitin, cellulose, agarose, carboxymethylcellulose, chitin, chitosan and the like.
- recombinant peptides are particularly preferred.
- These biocompatibility polymers may be designed to improve cell adhesion.
- a cell adhesion substrate (fibronectin, vitronectin, laminin) to a substrate surface or a cell adhesion sequence (represented by a single amino acid code, RGD sequence, LDV sequence, REDV sequence, YIGSR sequence, PDSGR sequence, RYVVLPR sequence) , Coating with LGTIPG sequence, RNIAEIIKDI sequence, IKVAV sequence, LRE sequence, DGEA sequence, and HAV sequence) peptide, "amination of substrate surface, cationization", or "plasma treatment of substrate surface, hydrophilicity by corona discharge” Methods such as sex processing can be used.
- polypeptide containing recombinant peptide or chemically synthesized peptide is not particularly limited as long as it has biocompatibility, but, for example, gelatin, collagen, atelocollagen, elastin, fibronectin, pronectin, laminin, tenascin, fibrin, fibroin, entactin , Thrombospondin and retronectin are preferred, and most preferred are gelatin, collagen and atelocollagen.
- the gelatin for use in the present invention is preferably natural gelatin, recombinant gelatin or chemically synthesized gelatin, and more preferably recombinant gelatin.
- natural gelatin means gelatin made from collagen of natural origin.
- chemically synthesized peptide or chemically synthesized gelatin is meant an artificially synthesized peptide or gelatin.
- the synthesis of the peptide such as gelatin may be solid phase synthesis or liquid phase synthesis, but is preferably solid phase synthesis.
- Solid phase synthesis of peptides is known to the person skilled in the art, for example Fmoc group synthesis using Fmoc group (Fluorenyl-Methoxy-Carbonyl group) as protection of amino group, as well as Boc group (tert-Butyl as protection of amino group A Boc group synthesis method using an Oxy Carbonyl group) and the like can be mentioned.
- the preferred embodiments of chemically synthesized gelatin can be applied to the contents described in recombinant gelatin described later in this specification.
- the hydrophilicity value "1 / IOB" value of the biocompatible polymer used in the present invention is preferably 0 to 1.0. More preferably, it is 0 to 0.6, and more preferably 0 to 0.4.
- the IOB is an indicator of hydrophilicity / hydrophobicity based on an organic conceptual diagram representing the polarity / non-polarity of the organic compound proposed by Atsushi Fujita, and the details are described in, for example, "Pharmaceutical Bulletin", vol. 2, 2, pp .163-173 (1954), "Domain of Chemistry” vol. 11, 10, pp. 719-725 (1957), “Fragrance Journal", vol. 50, pp. 79-82 (1981), etc. There is.
- the source of all organic compounds is methane (CH 4 ), and all the other compounds are regarded as derivatives of methane, and their carbon numbers, substituents, modified parts, rings, etc. are set to certain numerical values.
- the scores are added to obtain the organic value (OV) and the inorganic value (IV), and this value is plotted on the diagram with the organic value on the X axis and the inorganic value on the Y axis. It is something.
- the IOB in the organic conceptual diagram means the ratio of the inorganic value (IV) to the organic value (OV) in the organic conceptual diagram, that is, "inorganic value (IV) / organic value (OV)".
- hydrophilicity is expressed by "1 / IOB” value which is the reciprocal of IOB. The smaller the “1 / IOB” value (closer to 0), the more hydrophilic the expression.
- the hydrophilicity index represented by Grand average of hydropathicity (GRAVY) value is 0.3 or less, minus 9.0 or more, More preferably, it is 0.0 or less and -7.0 or more.
- Grand average of hydropathicity (GRAVY) values can be obtained from Gasteiger E., Hoogland C., Gattiker A., Duvaud S., Wilkins MR, Appel RD, Bairoch A .; Protein Identification and Analysis Tools on the ExPASy Server; John M. Walker (ed): The Proteomics Protocols Handbook, Humana Press (2005). Pp.
- the biocompatible polymer is preferably a recombinant gelatin.
- the recombinant gelatin is a polypeptide or protein-like substance having a gelatin-like amino acid sequence produced by genetic engineering technology, and is preferably a recombinant of an amino acid sequence derived from a partial amino acid sequence of collagen.
- the recombinant gelatin is preferably one having a repeat of the sequence represented by Gly-XY characteristic of collagen (X and Y each independently represent any amino acid).
- the plurality of Gly-X-Y may be the same or different.
- the recombinant gelatin those described, for example, in EP 1014176, US Pat. No. 6,992,172, International Publication WO 2004/85473, International Publication WO 2008/103041, etc. can be used, but the present invention is not limited thereto.
- Preferred as the recombinant gelatin used in the present invention is a recombinant gelatin of the following aspect.
- the recombinant gelatin is excellent in biocompatibility due to the natural performance of natural gelatin, and is not of natural origin, so there is no concern such as bovine spongiform encephalopathy (BSE) and is excellent in noninfectiousness.
- BSE bovine spongiform encephalopathy
- the recombinant gelatin is more uniform than the natural gelatin and the sequence is determined, it is possible to design the blur less precisely by the cross-linking and the like also in the strength and the degradability.
- the molecular weight of the recombinant gelatin is not particularly limited, but is preferably 2000 or more and 100000 or less (2 kDa (kilodalton) or more and 100 kDa or less), more preferably 2500 or more and 95000 or less (2.5 kDa or more and 95 kDa or less) Is 5000 or more and 90000 or less (5 kDa or more and 90 kDa or less), and most preferably 10000 or more and 90000 or less (10 kDa or more and 90 kDa or less).
- the recombinant gelatin preferably has a repeat of the sequence shown by Gly-XY characteristic of collagen.
- the plurality of Gly-X-Y may be the same or different.
- Gly-XY Gly represents glycine
- X and Y represent any amino acids (preferably, any amino acids other than glycine).
- the sequence represented by Gly-XY, which is characteristic of collagen, is a highly specific partial structure in the amino acid composition and sequence of gelatin-collagen as compared with other proteins. In this part, glycine accounts for about one third of the whole, and in the amino acid sequence, one out of every three repeats.
- Glycine is the simplest amino acid, has less restriction on the arrangement of molecular chains, and greatly contributes to regeneration of the helical structure upon gelation.
- the amino acids represented by X and Y contain a large amount of imino acids (proline and oxyproline), and preferably account for 10% to 45% of the total.
- at least 80%, more preferably at least 95%, most preferably at least 99% of the amino acids of the recombinant gelatin sequence are the repeated structure of Gly-XY.
- common polar amino acids are charged and uncharged at 1: 1.
- polar amino acids specifically refer to cysteine, aspartic acid, glutamic acid, histidine, lysine, asparagine, glutamine, serine, threonine, tyrosine and arginine
- polar uncharged amino acids among these include cysteine, asparagine, glutamine, serine , Threonine and tyrosine.
- the proportion of polar amino acids is 10 to 40%, preferably 20 to 30%, of the total amino acids constituting the composition.
- the ratio of the uncharged amino acid in the polar amino acid is preferably 5% or more and less than 20%, more preferably 5% or more and less than 10%. Furthermore, it is preferable not to include any one amino acid, preferably two or more amino acids of serine, threonine, asparagine, tyrosine and cysteine on the sequence.
- polypeptides the minimum amino acid sequence that works as a cell adhesion signal is known (eg, “Pathophysiology” Vol. 9, No. 7 (1990) page 527) published by Nagai Publishing Co., Ltd.
- the recombinant gelatin used in the present invention may have two or more of these cell adhesion signals in one molecule.
- Specific sequences include RGD sequence, LDV sequence, REDV sequence, YIGSR sequence, PDSGR sequence, RYVVLPR sequence, LGTIPG sequence, RNIAEIIKDI sequence, which is expressed by single-letter amino acid notation in that there are many types of cells to adhere.
- the sequences of IKVAV, LRE, DGEA and HAV are preferred.
- RGD sequences More preferred are RGD sequences, YIGSR sequences, PDSGR sequences, LGTIPG sequences, IKVAV sequences and HAV sequences, and particularly preferred are RGD sequences.
- RGD sequences preferred are ERGD sequences.
- the number of amino acids between RGDs is not uniform between 0 and 100, preferably between 25 and 60.
- the content of the minimum amino acid sequence is preferably 3 to 50, more preferably 4 to 30, and particularly preferably 5 to 20 in one molecule of protein. Most preferably, it is twelve.
- the ratio of the RGD motif to the total number of amino acids is preferably at least 0.4%. Where the recombinant gelatin comprises more than 350 amino acids, it is preferred that each stretch of 350 amino acids comprises at least one RGD motif.
- the ratio of RGD motif to the total number of amino acids is more preferably at least 0.6%, still more preferably at least 0.8%, still more preferably at least 1.0%, particularly preferably at least 1.2. %, Most preferably at least 1.5%.
- the number of RGD motifs in the recombinant peptide is preferably at least 4, more preferably 6, more preferably 8, particularly preferably 12 to 16, per 250 amino acids.
- a percentage of 0.4% of the RGD motif corresponds to at least one RGD sequence per 250 amino acids. Because the number of RGD motifs is an integer, gelatin consisting of 251 amino acids must contain at least two RGD sequences in order to meet the 0.4% feature.
- the recombinant gelatin of the present invention comprises at least 2 RGD sequences per 250 amino acids, more preferably at least 3 RGD sequences per 250 amino acids, more preferably at least 4 per 250 amino acids. Contains RGD sequence.
- a further embodiment of the recombinant gelatin of the present invention comprises at least 4 RGD motifs, preferably 6, more preferably 8 and even more preferably 12 or more and 16 or less.
- the recombinant gelatin may be partially hydrolyzed.
- the recombinant gelatin used in the present invention is represented by the following formula 4.
- Formula 4 A-[(Gly-X-Y) n ] m- B
- A represents any amino acid or amino acid sequence
- B represents any amino acid or amino acid sequence
- n pieces of X each independently represent any of amino acids
- n pieces of Y each independently represent amino acids Indicates one.
- n is preferably an integer of 3 to 100, more preferably an integer of 15 to 70, and most preferably an integer of 50 to 65.
- m preferably represents an integer of 2 to 10, more preferably an integer of 3 to 5.
- the n pieces of Gly-X-Y may be the same or different.
- the recombinant gelatin used in the present invention is represented by the following formula 5.
- Formula 5 Gly-Ala-Pro-[(Gly-X-Y) 63 ] 3 -Gly
- 63 Xs each independently represent any of amino acids
- 63 Ys each independently represent any of amino acids.
- the 63 Gly-X-Y groups may be the same or different.
- the naturally occurring collagen referred to here may be any naturally occurring collagen, but is preferably type I, II, III, IV or V collagen. More preferably, it is type I, type II or type III collagen. According to another form, the collagen is preferably human, bovine, porcine, murine or rat, more preferably human.
- the isoelectric point of the recombinant gelatin used in the present invention is preferably 5 to 10, more preferably 6 to 10, and still more preferably 7 to 9.5.
- the measurement of the isoelectric point of recombinant gelatin was described in Isoelectric focusing (Maxey, CR (1976; Phitogr. Gelatin 2, Editor Cox, P. J. Academic, London, Engl.). Thus, it can be carried out by measuring the pH after passing a 1% by mass gelatin solution through a mixed crystal column of cation and anion exchange resin.
- the recombinant gelatin is not deaminated.
- the recombinant gelatin does not have telopentide.
- the recombinant gelatin is a substantially pure polypeptide prepared by a nucleic acid encoding an amino acid sequence.
- recombinant gelatin is (1) the amino acid sequence of SEQ ID NO: 1; or (2) the amino acid sequence of SEQ ID NO: 1 and 80% or more (preferably 90% or more, more preferably 95% or more, particularly preferably 98% or more) Amino acid sequences with sequence identity and biocompatibility: Have.
- the recombinant gelatin most preferably has the amino acid sequence as set forth in SEQ ID NO: 1.
- the recombinant gelatin may consist of an amino acid sequence in which one or several amino acids have been deleted, substituted or added in the amino acid sequence shown in SEQ ID NO: 1, and may have a bioaffinity amino acid sequence.
- the "one or several" in the "amino acid sequence in which one or several amino acids are deleted, substituted or added” is preferably 1 to 20, more preferably 1 to 10, still more preferably 1 to 5 It means one, particularly preferably 1 to 3.
- the recombinant gelatin can be produced by gene recombination technology known to those skilled in the art, and for example, according to the method described in EP1014176A2, U.S. Pat. No. 6,992,172, WO 2004/85473, WO 2008/103041, etc. It can manufacture according to the same. Specifically, a gene encoding an amino acid sequence of a predetermined recombinant gelatin is obtained and incorporated into an expression vector to prepare a recombinant expression vector, which is introduced into an appropriate host to prepare a transformant. . Since the recombinant gelatin is produced by culturing the obtained transformant in an appropriate medium, the recombinant gelatin used in the present invention can be prepared by recovering the recombinant gelatin produced from the culture. .
- the method for producing the biocompatible polymer film is not particularly limited, and the biocompatible polymer film can be produced by a conventional method.
- a biocompatible polymer film can be produced by pouring an aqueous solution of a biocompatible polymer into a plastic tray and drying at a low temperature (eg, in a refrigerator at 4 ° C.) or at room temperature.
- the aqueous solution of the biocompatible polymer is dried at low temperature (eg, in a refrigerator at 4 ° C., etc.).
- the biocompatible polymer in the biocompatible polymer film can be crosslinked.
- Common crosslinking methods include thermal crosslinking, crosslinking with aldehydes (eg, formaldehyde, glutaraldehyde, etc.), crosslinking with condensing agents (carbodiimide, cyanamide, etc.), enzymatic crosslinking, photocrosslinking, ultraviolet crosslinking, hydrophobic interaction, Hydrogen bonds, ionic interactions and the like are known, and the above crosslinking method can be used in the present invention as well.
- the crosslinking method used in the present invention is more preferably thermal crosslinking, ultraviolet crosslinking or enzyme crosslinking, and particularly preferably thermal crosslinking.
- the enzyme When performing crosslinking by an enzyme, the enzyme is not particularly limited as long as it has a crosslinking action between polymer materials, but preferably, crosslinking can be performed using transglutaminase and laccase, most preferably transglutaminase .
- a specific example of the protein which is enzymatically crosslinked by transglutaminase is not particularly limited as long as it is a protein having a lysine residue and a glutamine residue.
- the transglutaminase may be of mammalian origin or of microbial origin.
- Ajinomoto's Activa series mammalian transglutaminase released as a reagent, for example, Human-derived blood coagulation factors (Factor XIIIa, Haematologic Technologies, Inc., such as guinea pig liver-derived transglutaminase such as Oriental Yeast Co., Ltd., Upstate USA Inc., Biodesign International, goat-derived transglutaminase, rabbit-derived transglutaminase, etc. Company) and the like.
- Human-derived blood coagulation factors Factor XIIIa, Haematologic Technologies, Inc., such as guinea pig liver-derived transglutaminase such as Oriental Yeast Co., Ltd., Upstate USA Inc., Biodesign International, goat-derived transglutaminase, rabbit-derived transglutaminase, etc. Company
- the reaction temperature at the time of crosslinking is not particularly limited as long as crosslinking is possible, but is preferably ⁇ 100 ° C. to 500 ° C., more preferably 0 ° C. to 300 ° C., further preferably C. to 300.degree. C., still more preferably 100.degree. C. to 250.degree. C., particularly preferably 120.degree. C. to 200.degree.
- reaction time for crosslinking is not particularly limited, it is generally 1 hour to 72 hours, preferably 2 hours to 48 hours, and more preferably 4 hours to 36 hours. is there.
- the cell sheet in the present invention means a sheet containing cells as a main component.
- the cell sheet is a sheet in which cells are linked to each other and has a sheet-like shape, and the configuration thereof is not particularly limited, and a monolayer cell sheet, a sheet formed of two or more layers of cells, or It may be any sheet formed of cells cultured in three dimensions.
- the cells may be linked to each other directly and / or via an mediator.
- the mediator is not particularly limited as long as it is a substance capable of at least mechanically connecting the cells, and examples thereof include extracellular matrix.
- the mediator is preferably of cell origin, in particular of the cells constituting the cell sheet.
- the cells are at least mechanically linked, but may be further functionally, eg chemically, electrically linked.
- the cell sheet in the present invention includes any cell capable of forming a cell sheet.
- Examples of cells include, but are not limited to, cardiomyocytes, myoblasts (eg, skeletal myoblasts), fibroblasts, synoviocytes, epithelial cells, and endothelial cells. Among the above, cardiomyocytes and skeletal myoblasts are preferred.
- cells cells derived from any organism that can be treated by a cell sheet can be used. The organism is not particularly limited, and examples thereof include humans, non-human primates (such as monkeys), dogs, cats, pigs, horses, goats, sheep, mice, rats and hamsters. In addition, although only one type of cells may be used, two or more types of cells can also be used. When there are two or more types of cells forming the cell sheet, the ratio (purity) of the largest number of cells is preferably 25% or more, more preferably 50% or more, at the end of cell sheet production, and more preferably 60% or more.
- the cell sheet can be produced by a known method for producing a cell sheet or a method analogous thereto.
- the cells may be cultured in a culture dish, and the sheets may be collected from the culture dish when the cells are sheeted.
- the method for producing the cell sheet is not particularly limited, but as an example, the cell sheet can be produced by the method described in JP-A-2010-81829.
- the cell sheet may be produced by culturing cells in a density that can form a cell sheet substantially without proliferation, in a cell culture medium free of an effective amount of growth factor.
- the "density capable of forming a cell sheet substantially without proliferation” means a cell density capable of forming a cell sheet when cultured in a growth factor-free medium.
- a cell density capable of forming a cell sheet when cultured in a growth factor-free medium.
- cells were seeded with a density of about 6,500 cells / cm 2 in order to form a cell sheet, Even if the cells at the above density are cultured in a growth factor-free medium, no cell sheet can be formed.
- "the density at which cell sheets can be formed substantially without proliferation” is typically 300,000 cells / cm 2 or more.
- the upper limit of the cell density is not particularly limited as long as the cell sheet formation is not impaired and the cells go into differentiation, and for skeletal myoblasts, it is, for example, 1,100,000 cells / cm 2 .
- the cells may or may not proliferate, but even if they do, they do not proliferate to the point of changing the cell properties.
- skeletal myoblasts begin to differentiate when confluent. Skeletal myoblasts are preferably seeded at a density that forms a cell sheet but does not go into differentiation. Preferably, the cells do not grow beyond the range of measurement error.
- Whether or not the cells have proliferated can be evaluated, for example, by comparing the number of cells at the time of seeding with the number of cells after formation of the cell sheet.
- the number of cells after cell sheet formation is typically 300% or less, preferably 200% or less, more preferably 150% or less, still more preferably 125% or less, particularly preferably the number of cells at the time of seeding. It is 100% or less.
- the culture of the cells is performed within a predetermined period, preferably, a period during which the cells do not go into differentiation.
- the cells are maintained in an undifferentiated state during the culture period.
- the transition to cell differentiation can be assessed by any method known to one skilled in the art.
- expression of myosin heavy chain (MHC) and multinucleation of cells can be used as an indicator of differentiation.
- the culture time is preferably within 48 hours, more preferably within 40 hours, and still more preferably within 24 hours.
- growth factor any substance that promotes cell proliferation relative to its absence, eg, epidermal growth factor (EGF), vascular endothelial growth factor (VEGF), or fibroblast growth factor ( FGF) and the like.
- EGF epidermal growth factor
- VEGF vascular endothelial growth factor
- FGF fibroblast growth factor
- an effective amount of growth factor is the amount of growth factor that promotes cell proliferation significantly, as compared to in the absence of growth factor, or conveniently added for the purpose of cell proliferation in the art Means quantity.
- the significance of cell growth promotion can be appropriately evaluated, for example, by any statistical method known in the art, such as t-test, etc., and the usual addition amount can be varied according to various technical fields. It can be known from known literature.
- the effective amount of EGF in the culture of skeletal myoblasts is, for example, 0.005 ⁇ g / mL or more.
- the concentration of growth factor in the culture medium is less than such effective amount.
- the concentration of EGF in the culture medium in the culture of skeletal myoblasts is preferably less than 0.005 ⁇ g / mL, more preferably less than 0.001 ⁇ g / mL.
- the concentration of growth factor in the culture medium is less than the normal concentration in the organism.
- the concentration of EGF in the culture medium in the culture of skeletal myoblasts is preferably less than 5.5 ng / mL, more preferably less than 1.3 ng / mL, still more preferably 0.5 ng / mL. It is less than mL.
- the culture medium in the present invention is substantially free of growth factors.
- the term “substantially free” means that the growth factor content in the culture solution is such that the cell sheet is not adversely affected when applied to a living body, and preferably, the growth factor in the culture solution is positively Means not added to
- the culture medium does not contain other components therein, such as growth factors at concentrations above that contained in serum or the like.
- the cell culture solution (sometimes referred to simply as “culture solution”) is not particularly limited as long as it can maintain cell survival, but typically contains amino acids, vitamins, and electrolytes as main components. Available.
- the culture medium is based on a basal medium for cell culture.
- the basal medium is not limited to, for example, DMEM (Dulbecco's modified Eagle's medium), MEM (Eagle minimal essential medium), F12, Ham, RPMI 1640, MCDB (MCDB 102, 104, 107, 131, 153, 199 etc.), L15, SkBM (registered trademark), RITC80-7 and the like. Many of these basal media are commercially available, and their compositions are also known.
- the basal medium may be used as a standard composition (for example, as it is marketed), or its composition may be changed as appropriate depending on the cell type and cell conditions.
- the basal medium is not limited to those of known composition, and may be one in which one or more components are added, removed, increased or decreased.
- the amino acids contained in the basal medium are not particularly limited, and examples thereof include L-arginine, L-cystine, L-glutamine, glycine, L-histidine, L-isoleucine, L-leucine, L-lysine, L-methionine, and the like. Examples include L-phenylalanine, L-serine, L-threonine, L-tryptophan, L-tyrosine, L-valine and the like.
- the vitamins contained in the basal medium are not particularly limited.
- calcium D-pantothenate, choline chloride, folic acid, i-inositol, niacinamide, riboflavin, thiamine, pyridoxine, biotin, lipoic acid, vitamin B 12 , Adenine, thymidine and the like can be mentioned.
- the electrolyte contained in the basal medium is not particularly limited.
- CaCl 2 , KCl, MgSO 4 , NaCl, NaH 2 PO 4 , NaHCO 3 , Fe (NO 3 ) 3 , FeSO 4 , CuSO 4 , MnSO 4 , Na 2 SiO 3 , (NH 4 ) 6Mo 7 O 24 , NaVO 3 , NiCl 2 , ZnSO 4 and the like can be mentioned.
- the basal medium may contain, in addition to these components, saccharides such as D-glucose, sodium pyruvate, pH indicators such as phenol red, putrescine, and the like.
- the cell culture medium is substantially free of the steroid component.
- the "steroid agent component” refers to a compound having a steroid nucleus that can exert adverse effects such as adrenocortical dysfunction, Cushing's syndrome and the like on a living body.
- the compound is not particularly limited, and examples thereof include cortisol, prednisolone, triamcinolone, dexamethasone, betamethasone and the like. Therefore, the phrase "substantially free of steroid component” means that the content of the above-mentioned compound in the culture solution is not adversely affected when the cell sheet is applied to a living body, and preferably in the culture solution. In other words, the culture solution does not contain the steroid component at a higher concentration than that contained in other components such as serum.
- the cell culture medium is substantially free of heterologous serum components.
- heterologous serum component means a serum component derived from an organism of a species different from that of the recipient.
- serum derived from bovine or horse such as fetal bovine serum (FBS, FCS), calf serum (CS), equine serum (HS), etc. corresponds to different serum components.
- substantially free of heterologous serum components means that the content of these sera in the culture solution is not adversely affected when the cell sheet is applied to the living body (for example, the serum albumin content in the cell sheet) Is preferably less than 50 ng, which preferably means that these substances are not actively added to the culture solution.
- the cell culture medium comprises allogeneic serum components.
- homologous serum component means a serum component derived from an organism of the same species as the recipient.
- human serum corresponds to the homologous serum component.
- the allogeneic serum component is an autologous serum component, ie a serum component derived from the recipient.
- the content of the allogeneic serum component is not particularly limited as long as it allows formation of a cell sheet, but preferably 5 to 40 v / v (volume / volume)%, more preferably 10 to 20 v / v (volume / volume) ) Is%.
- the cell culture medium is substantially free of selenium components.
- the "selenium component” includes a selenium molecule and a selenium-containing compound, in particular, a selenium-containing compound capable of releasing a selenium molecule in vivo, such as selenium acid and the like. Therefore, the phrase "substantially free of selenium component” means that the content of these substances in the culture solution is not adversely affected when the cell sheet is applied to a living body, and preferably in the culture solution. In other words, the culture solution does not contain the selenium component at a concentration higher than that contained in other components such as serum etc.
- the selenium concentration in the culture solution is the normal value (for example, 10.6 to 17.4 ⁇ g / dL) in human serum, and the proportion of human serum contained in the medium is It is lower than the multiplied value (ie, if the content of human serum is 10%, the selenium concentration is, for example, less than 1.0 to 1.7 ⁇ g / dL).
- Cell sheets are typically manufactured by seeding the cells in culture medium and culturing the cells to form a cell sheet.
- Culturing of the cells can be performed under conditions commonly used in the art.
- typical culture conditions include culture at 37 ° C., 5% CO 2 .
- the culture period is preferably within 48 hours, more preferably within 40 hours, still more preferably within 24 hours, from the viewpoint of sufficient formation of the cell sheet and prevention of cell differentiation.
- Culturing can be performed in vessels of any size and shape.
- ⁇ Method of manufacturing laminate> It will not be limited especially if it is a method which can make a cell sheet and a biocompatibility polymer film laminate as a manufacturing method of a layered product of the present invention.
- the biocompatibility polymer film may be laminated on the surface of the cell sheet, or the cell sheet on the surface of the biocompatibility polymer film May be laminated.
- the laminate may be prepared by forming a cell sheet by seeding and culturing cells on the surface of the biocompatible polymer film.
- the laminate of the present invention can be used to treat a subject's disease or illness.
- a cell sheet of skeletal myoblasts can be used as a therapeutic agent for heart disease.
- Heart diseases include, for example, myocardial infarction, ischemic cardiomyopathy, dilated cardiomyopathy, angina pectoris and the like.
- Examples of the administration method of the therapeutic agent for heart disease containing the laminate of the present invention include a method for directly sticking the therapeutic agent for heart disease on the injured site of the damaged myocardial tissue.
- the administration target of the agent for treating heart disease containing the laminate of the present invention is not particularly limited, but preferably human, non-human primate (such as monkey), dog, cat, pig, horse, goat, sheep, rat, mouse and hamster And the like, and more preferably human.
- the biocompatibility polymer film of 500 ⁇ g / cm 2 to 10 mg / cm 2 can be produced by laminating the cell sheet on the laminate of the present invention. Therefore, according to the present invention, there is provided a film for cell sheet lamination comprising a biocompatible polymer film of 500 ⁇ g / cm 2 to 10 mg / cm 2 . Details and preferred embodiments of the biocompatible polymer film are as described hereinabove.
- CBE3 Recombinant gelatin
- CBE3 Molecular weight: 51.6 kD Structure: GAP [(GXY) 63 ] 3 G Amino acid number: 571 RGD sequence: 12 imino acid content: 33% Almost 100% of the amino acids are GXY repeating structures.
- the amino acid sequence of CBE3 does not include serine, threonine, asparagine, tyrosine and cysteine.
- CBE3 has the ERGD sequence. Isoelectric point: 9.34 GRAVY value: -0.682 1 / IOB value: 0.
- a recombinant gelatin film was prepared using CBE3 of Example 1 as a representative example of a polymer film.
- a 1% by weight, 2% by weight, 3% by weight or 4% by weight CBE3 aqueous solution was prepared, and 4 mL of this CBE3 aqueous solution was poured into a plastic tray provided with a silicone frame (8 cm ⁇ 10 cm). The plastic tray was dried at 4 ° C. or room temperature until the water was gone to obtain a recombinant gelatin film.
- the above-mentioned recombinant gelatin film was taken out from the plastic tray / silicone frame, and thermally crosslinked at 160 ° C. under reduced pressure (crosslinking time was 6 hours, 12 hours, 24 hours) to obtain an insoluble recombinant gelatin film sample.
- the swelling ratio was evaluated as a physical property value for each of the recombinant gelatin films produced in the above (2).
- a recombinant gelatin film was cut out with a biopsy tray with a diameter of 8 mm to prepare a disc-like film with a diameter of 8 mm.
- the thickness at the time of drying was measured and it was set as the film thickness at the time of drying.
- the disk-like film was sufficiently wetted with water for injection, and then the wet thickness was measured to obtain a wet film thickness.
- the film thickness was measured using a micrometer (Mitsutoyo manufactured soft touch micro CLM).
- the swelling ratio ((Swelling film thickness [ ⁇ m] / drying film thickness [ ⁇ m]) ⁇ 100) was calculated from the wet film thickness and the dry film thickness.
- the polymer film has a swelling ratio ((film thickness when swollen [ ⁇ m] / film thickness when dried [ ⁇ m]) ⁇ 100) ⁇ ⁇ 27.5 ⁇ film thickness when dried [ ⁇ m] +880 Is preferably Swelling ratio ((film thickness when swollen [ ⁇ m] / film thickness when dried [ ⁇ m]) x 100) -2 -27.5 ⁇ film thickness when dried [ ⁇ m] + 962.5 It was found to be more preferable.
- Fig. 2 shows a schematic diagram of the test system and the results.
- an albumin solution in which albumin was dissolved in PBS (phosphate buffered saline) at 41 mg / mL was placed.
- PBS phosphate buffered saline
- various polymer films were placed, and the amount of albumin permeating to the lower solution (PBS) was measured over time.
- Bio-Rad Protein Assay BIO-RAD
- the permeated albumin maintains the same molecular weight of 66 kDa as the upper solution. I understood. Moreover, it was also confirmed that there is a large difference in the amount of albumin permeated between the film group having high protein permeability and the film group having low protein permeability.
- a recombinant gelatin film swollen with the same medium is placed on the bottom of a 6 mm diameter silicone frame, and rat skeletal myoblasts are seeded at 1.3 ⁇ 10 6 cells in the same manner as above, 37 ° C., 5% CO 2
- a laminate of a recombinant gelatin film and a cell sheet was obtained.
- the left ventricular short axis image is drawn at the papillary muscle level with an echocardiography device (HD11XE, Philips Electronics Japan Co., Ltd.), and the left ventricular end diastolic cross section (hereinafter referred to as LVEDA) and the left ventricular end systolic cross section
- LVEDA left ventricular end diastolic cross section
- FAC left ventricular cavity area change rate
- LVESA left ventricular cavity area change rate
- the group to which the laminate of the polymer film and the cell sheet was transplanted was found to maintain the value of FAC until 12 weeks after transplantation and maintain cardiac function.
- 3 out of 4 mice died of heart failure by 12 weeks after transplantation, and FAC of individuals who survived 12 weeks after transplantation was also significantly reduced.
- transplantation of a laminate of a polymer film and a cell sheet maintains cardiac function and has an effect of improving the survival rate. Furthermore, since there was no significant difference in FAC value between the group in which the laminate of the polymer film and the cell sheet was transplanted and the group in which the cell sheet was transplanted, the polymer film and the cell sheet were laminated. Even when the body was transplanted, it was considered that the therapeutic effect of the cell transplantation was not inhibited compared to the case where the cell sheet was transplanted.
- Myosin Heavy Chain positive skeletal myoblasts remained in layers in an individual to which a laminate of a polymer film and a cell sheet was transplanted.
- These Myosin Heavy Chain positive cells had a sarcomere structure characteristic of skeletal muscle cells, and it was considered that skeletal myoblasts engrafted and matured into skeletal muscle cells.
- the survival of such transplanted cells could not be confirmed in individuals transplanted with the cell sheet, by transplanting the laminate of the polymer film and the cell sheet, the condition of the cells after transplantation can be improved. It was thought that the engraftment of transplanted cells could be promoted by maintaining and improving blood flow from the heart including angiogenesis.
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Abstract
Description
[2] 生体親和性高分子フィルムが、下記式1を満たす、[1]に記載の積層体。
式1:(膨潤時膜厚/乾燥時膜厚)×100≧-27.5×乾燥時膜厚+880
但し、膨潤時膜厚および乾燥時膜厚の単位はμmである。
[3] 生体親和性高分子フィルムが、下記式2を満たす、[1]または[2]に記載の積層体。
式2:(膨潤時膜厚/乾燥時膜厚)×100≧-27.5×乾燥時膜厚+962.5
但し、膨潤時膜厚および乾燥時膜厚の単位はμmである。
[4] 生体親和性高分子フィルムの下記式3で示される膨潤率が230%以上である、[1]~[3]の何れか一に記載の積層体。
式3:(膨潤時膜厚/乾燥時膜厚)×100
但し、膨潤時膜厚および乾燥時膜厚の単位はμmである。
[5] 生体親和性高分子フィルムの乾燥時膜厚が、5~200μmである、[1]~[4]のいずれか一に記載の積層体。
[6] 生体親和性高分子フィルムの湿潤時膜厚が、50~500μmである、[1]~[5]のいずれか一に記載の積層体。
[7] 細胞が、心筋細胞または骨格筋芽細胞である、[1]~[6]のいずれか一に記載の積層体。
[8] 生体親和性高分子が、リコンビナントゼラチンである、[1]~[7]のいずれか一に記載の積層体。
[9] リコンビナントゼラチンが、下記式4で示される、[8]に記載の積層体。
式4: A-[(Gly-X-Y)n]m-B
式中、Aは任意のアミノ酸またはアミノ酸配列を示し、Bは任意のアミノ酸またはアミノ酸配列を示し、n個のXはそれぞれ独立にアミノ酸のいずれかを示し、n個のYはそれぞれ独立にアミノ酸のいずれかを示し、nは3~100の整数を示し、mは2~10の整数を示す。なお、n個のGly-X-Yはそれぞれ同一でも異なっていてもよい。
[10] リコンビナントゼラチンが、下記式5で示される、[8]または[9]に記載の積層体。
式5: Gly-Ala-Pro-[(Gly-X-Y)63]3-Gly
式中、63個のXはそれぞれ独立にアミノ酸の何れかを示し、63個のYはそれぞれ独立にアミノ酸の何れかを示す。なお、63個のGly-X-Yはそれぞれ同一でも異なっていてもよい。
[11] リコンビナントゼラチンが、(1)配列番号1に記載のアミノ酸配列、または(2)配列番号1に記載のアミノ酸配列と80%以上の配列同一性を有し、生体親和性を有するアミノ酸配列を有する、[8]~[10]のいずれか一に記載の積層体。
[12] リコンビナントゼラチンが、配列番号1に記載のアミノ酸配列を有する、[8]~[11]のいずれか一に記載の積層体。
[13] [1]~[12]のいずれか一に記載の積層体を含む、心疾患治療剤。
[14] 500μg/cm2~10mg/cm2の生体親和性高分子フィルムからなる、細胞シート積層用フィルム。
[16] 心疾患治療剤の製造のための、[1]~[12]のいずれか一に記載の積層体の使用。
[17] [1]~[12]のいずれか一に記載の積層体を、心疾患治療を必要とする対象に移植することを含む、心疾患の治療方法。
<積層体>
本発明の積層体は、500μg/cm2~10mg/cm2の生体親和性高分子フィルムと、上記生体親和性高分子フィルムの少なくとも一方の表面上に配置された細胞シートとを含む積層体である。本明細書において、生体親和性高分子フィルムは高分子フィルムとも言う。
(生体親和性高分子フィルムの特性)
本発明で用いる生体親和性高分子フィルムの密度は、500μg/cm2~10mg/cm2である。密度を上記の範囲内とすることにより、十分な強度を有する積層体を製造することが可能になる。生体親和性高分子フィルムの密度は、好ましくは500μg/cm2~5.0mg/cm2であり、より好ましくは500μg/cm2~2.0mg/cm2である。
生体親和性高分子フィルムの密度は、作製時の「塗布質量÷塗布面積」で算出する。なお、塗布質量とは塗布された生体親和性高分子の質量を意味する。
式1:(膨潤時膜厚/乾燥時膜厚)×100≧-27.5×乾燥時膜厚+880
但し、膨潤時膜厚および乾燥時膜厚の単位はμmである。
式1を満たすことにより、生体親和性高分子フィルムのハンドリング性能がより向上するので好ましい。なお、生体親和性高分子溶液を乾燥させてフィルムを作製する際に、4℃でゲル化させた状態のまま乾燥させてフィルムを作製する場合には上記式1を満たす生体親和性高分子フィルムが得られ、ハンドリング性能がより向上する。一方、室温(25℃)で乾燥させることによって生体親和性高分子フィルムを作製すると、上記式1を満たさない生体親和性高分子フィルムが得られる。
式2:(膨潤時膜厚/乾燥時膜厚)×100≧-27.5×乾燥時膜厚+962.5
但し、膨潤時膜厚および乾燥時膜厚の単位はμmである。
式2を満たすことにより、生体親和性高分子フィルムのハンドリング性能は、式1を満たす場合と比較して、さらに向上する。
式3:(膨潤時膜厚/乾燥時膜厚)×100
但し、膨潤時膜厚および乾燥時膜厚の単位はμmである。
生体親和性高分子フィルムの湿潤時膜厚は、特に限定されないが、好ましくは50~500μmである。上記の範囲とすることにより、生体親和性高分子フィルムの反りを防止することができる。生体親和性高分子フィルムの湿潤時膜厚は、より好ましくは50~300μmであり、さらに好ましくは100~300μmである。
生体親和性とは、生体に接触した際に、長期的かつ慢性的な炎症反応などのような顕著な有害反応を惹起しないことを意味する。本発明で用いる生体親和性高分子は、生体に親和性を有するものであれば、生体内で分解されるか否かは特に限定されないが、生分解性高分子であることが好ましい。非生分解性高分子として具体的には、ポリテトラフルオロエチレン(PTFE)、ポリウレタン、ポリプロピレン、ポリエステル、塩化ビニル、ポリカーボネート、アクリル、シリコーン、およびMPC(2-メタクリロイルオキシエチルホスホリルコリン)などが挙げられる。生分解性高分子としては、具体的には、天然由来のペプチド、リコンビナントペプチドまたは化学合成ペプチドなどのポリペプチド(例えば、以下に説明するゼラチン等)、ポリ乳酸、ポリグリコール酸、乳酸・グリコール酸コポリマー(PLGA)、ヒアルロン酸、グリコサミノグリカン、プロテオグリカン、コンドロイチン、セルロース、アガロース、カルボキシメチルセルロース、キチン、およびキトサンなどが挙げられる。上記の中でも、リコンビナントペプチドが特に好ましい。これら生体親和性高分子には細胞接着性を高める工夫がなされていてもよい。具体的には、「基材表面に対する細胞接着基質(フィブロネクチン、ビトロネクチン、ラミニン)や細胞接着配列(アミノ酸一文字表記で表される、RGD配列、LDV配列、REDV配列、YIGSR配列、PDSGR配列、RYVVLPR配列、LGTIPG配列、RNIAEIIKDI配列、IKVAV配列、LRE配列、DGEA配列、およびHAV配列)ペプチドによるコーティング」、「基材表面のアミノ化、カチオン化」、または「基材表面のプラズマ処理、コロナ放電による親水性処理」といった方法を使用できる。
本発明で用いる高分子のGRAVY値を上記範囲とすることにより、親水性が高く、かつ、吸水性が高くなる。
生体親和性高分子は、好ましくは、リコンビナントゼラチンである。
リコンビナントゼラチンとは、遺伝子組み換え技術により作られたゼラチン類似のアミノ酸配列を有するポリペプチドもしくは蛋白様物質であり、好ましくはコラーゲンの部分アミノ酸配列に由来するアミノ酸配列の遺伝子組み換え体である。
リコンビナントゼラチンとしては、例えばEP1014176、米国特許6992172号、国際公開WO2004/85473、国際公開WO2008/103041等に記載のものを用いることができるが、これらに限定されるものではない。本発明で用いるリコンビナントゼラチンとして好ましいものは、以下の態様のリコンビナントゼラチンである。
この最小アミノ酸配列の含有量は、タンパク質1分子中3~50個が好ましく、さらに好ましくは4~30個、特に好ましくは5~20個である。最も好ましくは12個である。
式4: A-[(Gly-X-Y)n]m-B
式中、Aは任意のアミノ酸またはアミノ酸配列を示し、Bは任意のアミノ酸またはアミノ酸配列を示し、n個のXはそれぞれ独立にアミノ酸のいずれかを示し、n個のYはそれぞれ独立にアミノ酸のいずれかを示す。nは3~100の整数が好ましく、15~70の整数がさらに好ましく、50~65の整数が最も好ましい。mは好ましくは2~10の整数を示し、より好ましくは3~5の整数を示す。なお、n個のGly-X-Yはそれぞれ同一でも異なっていてもよい。
式5: Gly-Ala-Pro-[(Gly-X-Y)63]3-Gly
式中、63個のXはそれぞれ独立にアミノ酸の何れかを示し、63個のYはそれぞれ独立にアミノ酸の何れかを示す。なお、63個のGly-X-Yはそれぞれ同一でも異なっていてもよい。
好ましくは、リコンビナントゼラチンはテロペプタイドを有さない。
好ましくは、リコンビナントゼラチンは、アミノ酸配列をコードする核酸により調製された実質的に純粋なポリペプチドである。
(1)配列番号1に記載のアミノ酸配列;または
(2)配列番号1に記載のアミノ酸配列と80%以上(好ましくは90%以上、より好ましくは95%以上、特に好ましくは98%以上)の配列同一性を有し、生体親和性を有するアミノ酸配列:
を有する。
リコンビナントゼラチンは、最も好ましくは、配列番号1に記載のアミノ酸配列を有する。
%配列同一性=[(同一残基数)/(アラインメント長)]×100
2つのアミノ酸配列における配列同一性は当業者に公知の任意の方法で決定することができ、BLAST((Basic Local Alignment Search Tool))プログラム(J.Mol.Biol.215:403-410,1990)等を使用して決定することができる。
「1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列」における「1若しくは数個」とは、好ましくは1~20個、より好ましくは1~10個、さらに好ましくは1~5個、特に好ましくは1~3個を意味する。
生体親和性高分子フィルムの製造方法は特に限定されず、生体親和性高分子フィルムは常法により製造することができる。例えば、生体親和性高分子の水溶液を、プラスチックトレーに流し込み、低温下(例えば、4℃の冷蔵庫中など)または室温において乾燥することにより生体親和性高分子フィルムを製造することができる。好ましくは、生体親和性高分子の水溶液は、低温下(例えば、4℃の冷蔵庫中など)において乾燥する。
一般的な架橋方法としては、熱架橋、アルデヒド類(例えば、ホルムアルデヒド、グルタルアルデヒドなど)による架橋、縮合剤(カルボジイミド、シアナミドなど)による架橋、酵素架橋、光架橋、紫外線架橋、疎水性相互作用、水素結合、イオン性相互作用などが知られており、本発明においても上記の架橋方法を使用することができる。本発明で使用する架橋方法としては、さらに好ましくは熱架橋、紫外線架橋、または酵素架橋であり、特に好ましくは熱架橋である。
本発明における細胞シートとは、細胞を主成分とするシートを意味する。細胞シートは、細胞が互いに連結してシート状になったものであり、シート形状である限り、その構成は特に限定されず、単層細胞シート、二層以上の細胞で形成されたシート、または三次元培養された細胞で形成されたシートの何れでもよい。
基礎培地に含まれるビタミン類としては、特に限定されず、例えば、D-パントテン酸カルシウム、塩化コリン、葉酸、i-イノシトール、ナイアシンアミド、リボフラビン、チアミン、ピリドキシン、ビオチン、リポ酸、ビタミンB12、アデニン、チミジンなどが挙げられる。
基礎培地には、これらの成分のほか、D-グルコースなどの糖類、ピルビン酸ナトリウム、フェノールレッドなどのpH指示薬、プトレシンなどを含んでもよい。
本発明の積層体の製造方法としては、細胞シートと生体親和性高分子フィルムとを積層させることができる方法であれば、特に限定されない。例えば、細胞シートと生体親和性高分子フィルムとを別々に作製した後に、細胞シートの表面に生体親和性高分子フィルムを積層化してもよいし、あるいは生体親和性高分子フィルムの表面に細胞シートを積層化してもよい。あるいは、生体親和性高分子フィルムを予め作製した後に、生体親和性高分子フィルムの表面上に細胞を播種して培養することによって細胞シートを形成することによって積層体を調製してもよい。
本発明の積層体は、対象の疾病、傷病の治療に用いることができる。例えば、骨格筋芽細胞による細胞シートは、心疾患治療剤として使用することができる。心疾患としては、例えば、心筋梗塞、虚血性心筋症、拡張型心筋症、狭心症などが挙げられる。
本発明の積層体を含む心疾患治療剤の投与対象は特に限定されないが、好ましくはヒト、非ヒト霊長類(サルなど)、イヌ、ネコ、ブタ、ウマ、ヤギ、ヒツジ、ラット、マウスおよびハムスターなどが挙げられ、より好ましくはヒトである。
上記した通り、500μg/cm2~10mg/cm2の生体親和性高分子フィルムは、細胞シートに積層することによって、本発明の積層体を製造することができる。従って、本発明によれば、500μg/cm2~10mg/cm2の生体親和性高分子フィルムからなる細胞シート積層用フィルムが提供される。生体親和性高分子フィルムの詳細および好ましい態様は本明細書中上記した通りである。
リコンビナントゼラチンとして以下のCBE3を用意した(国際公開WO2008/103041号公報に記載)。
CBE3:
分子量:51.6kD
構造: GAP[(GXY)63]3G
アミノ酸数:571個
RGD配列:12個
イミノ酸含量:33%
ほぼ100%のアミノ酸がGXYの繰り返し構造である。CBE3のアミノ酸配列には、セリン、スレオニン、アスパラギン、チロシンおよびシステインは含まれていない。CBE3はERGD配列を有している。
等電点:9.34
GRAVY値:-0.682
1/IOB値:0.323
アミノ酸配列(配列表の配列番号1)(国際公開WO2008/103041号公報の配列番号3と同じ。但し末尾のXは「P」に修正)
GAP(GAPGLQGAPGLQGMPGERGAAGLPGPKGERGDAGPKGADGAPGAPGLQGMPGERGAAGLPGPKGERGDAGPKGADGAPGKDGVRGLAGPIGPPGERGAAGLPGPKGERGDAGPKGADGAPGKDGVRGLAGPIGPPGPAGAPGAPGLQGMPGERGAAGLPGPKGERGDAGPKGADGAPGKDGVRGLAGPP)3G
高分子フィルムの代表例として、実施例1のCBE3を用いてリコンビナントゼラチンフィルムを作製した。1質量%、2質量%、3質量%または4質量%のCBE3水溶液を調製し、このCBE3水溶液4mLを、シリコーン枠(8cm×10cm)を設置したプラスチックトレーに流し込んだ。このプラスチックトレーを4℃または室温にて、水分が無くなるまで乾燥させることによって、リコンビナントゼラチンフィルムを得た。
上記(2)で作製した各々のリコンビナントゼラチンフィルムについて、物性値として膨潤率の評価を行った。評価にあたっては、リコンビナントゼラチンフィルムを直径8mmの生検トレパンでくり貫き、直径8mmの円盤状フィルムを用意した。この際、乾燥時の厚さを測定し乾燥時膜厚とした。この円盤状フィルムを注射用水で十分に湿潤させた後に、湿潤時の厚さを測定し湿潤時膜厚とした。なお、膜厚の測定は、マイクロメータ(ミツトヨ製ソフトタッチマイクロCLM)を用いて行った。
この湿潤時膜厚と乾燥時膜厚から、膨潤率((膨潤時膜厚[μm]/乾燥時膜厚[μm])×100)を算出した。
上記(3)のようにして得た湿潤状態の円盤状フィルムを用いてハンドリング性能の評価を実施した。この湿潤状態の円盤状フィルムの片側をピンセットでつまみ水平に持ち上げた場合、フィルムが水平を維持している場合をA、フィルムの先(ピンセットから遠い側)が下に垂れ30度以上曲がる場合をB、半分に折りたたまれる場合をCとしてハンドリング性能を評価した。なお、ハンドリング性能の評価がCであるフィルムも、所望により使用方法を工夫することにより(例えば、フィルムに枠をつけて使用するなど)、実用上は問題なく使用することができる。
また、高分子フィルムを細胞シートに積層した場合のハンドリング性能は高分子フィルムのみの場合と同じ結果であった。
上記(3)および(4)で評価した全ての結果を、膨潤率と乾燥時膜厚を縦軸と横軸に採ったグラフにプロットし、まとめた(図1)。また、個々の高分子フィルムのハンドリング性能評価(A、B、C)をもとにプロットした点を群分けした(図1)。その結果、乾燥時膜厚と膨潤率のグラフにおいて、ハンドリング性能と相関する境界線を引くことが可能になる、ということが分かった。
膨潤率((膨潤時膜厚[μm]/乾燥時膜厚[μm])×100)=-27.5×乾燥時膜厚[μm]+962.5
という境界線(境界線2)が存在することを見出した。
膨潤率((膨潤時膜厚[μm]/乾燥時膜厚[μm])×100)=-27.5×乾燥時膜厚[μm]+880
という境界線(境界線1)が存在することを見出した。
高分子フィルムが、膨潤率((膨潤時膜厚[μm]/乾燥時膜厚[μm])×100)≧-27.5×乾燥時膜厚[μm]+880
であることが好ましく、
膨潤率((膨潤時膜厚[μm]/乾燥時膜厚[μm])×100)≧-27.5×乾燥時膜厚[μm]+962.5
であることがより好ましいことが分かった。
上記(2)で作製した高分子フィルムを用いて、蛋白質成分の透過試験を実施した。蛋白質成分としては代表的アルブミン(分子量66kDa)を選択した。この蛋白質成分がフィルムを透過すれば、フィルムを介して栄養分のやり取りが可能になることを示している。
上記(6)で行った蛋白質透過試験について、アルブミンが分解せず、同じ分子量のままに上液から下液へ高分子フィルムフィルムを透過しているのか解析するために、SDS-PAGEを行い透過したアルブミンの分子量を確認した。
上記(6)および(7)で確認された蛋白質の透過性を、高分子フィルムの物性で解析した。上記(3)で実施した膨潤率と乾燥時膜厚をそれぞれ縦軸と横軸に採用したグラフを作成し、そこに試験した高分子フィルムをプロットした。その上で、上記(6)および(7)のa群とb群を群分けした(図4)。結果、a群とb群の間には、境界線として膨潤率=230という境界が引けることが分かった。
高分子フィルムと細胞シートとの積層体の代表例として、リコンビナントゼラチンフィルムと細胞シートとの積層体を作製した。DMEM low glucouse(Thermo Fisher Scientific社製)にウシ胎児血清(FBS)(Moregate社製)を20容量%加えた培地にラット骨格筋芽細胞を懸濁させ、48穴マルチウェル温度応答性培養皿(UpCell:セルシード社)に1.3×106cellsずつ播種し、37℃、5% CO2条件下にて一晩培養後、培養皿を室温下に置くことで細胞シートを得た。
生後8週齢の成体ラット(Lewis系、雄、日本チャールスリバー社製)に対してイソフルラン(アッヴィ社製)で吸入麻酔を行い、気管チューブを挿入して小動物用ベンチレータで強制呼吸させた状態で心臓を露出させ、冠動脈(LAD)を結紮し、閉胸した。1週間後心エコー装置(HD11XE、フィリップスエレクトロニクスジャパン社製)にて乳頭筋レベルで心臓左室短軸画像を描出し、左室拡張末期断面積(以下、LVEDAという)および左室収縮末期断面積(以下、LVESAという)から心機能(左室内腔面積変化率、以下FACという)を測定し(下式参照)、FACの値が60%を下回っていた個体について梗塞モデルが成立していると判断し、移植に供した。
梗塞モデル化した個体を、モデル作製処置と同様に麻酔処置を施した後、肋間を切開し心臓を露出させた。上記(9)で作製した高分子フィルムと細胞シートとの積層体、または細胞シートを心臓左室前壁部に移植した後、表面にフィブリン製剤(化学及血清療法研究所)を塗布した。フィブリン製剤が固まったことを確認した後、閉胸した(sham群(偽群)はフィブリン製剤の塗布のみ)。実施数は、高分子フィルムと細胞シートとの積層体を移植した群は6匹、細胞シートを移植した群は4匹、sham群4匹とした。
観察期間は、高分子フィルムと細胞シートとの積層体、または細胞シートを移植した後12週間までとした。梗塞モデル作製処置前、モデル判定・移植時、移植3週後、移植4週後、移植8週後および移植12週後に、心エコー検査を実施し、FACの変化から有効性を判断した。また、各群はTukey-Kramer法にて多重比較を行い、FAC変化の有意差を判定した。結果を図5に示す。
10質量%中性緩衝ホルマリンで移植後12週目の心臓を固定後、輪切りにしたものをパラフィン包埋し、3~4μmで薄切した。切片を脱パラフィンした後、0.3質量%過酸化水素加メタノールで処理し、1%ウシ血清アルブミン(BSA)を用いてブロッキングを行った。Monoclonal Anti-skeletal Myosin(FAST) Clone MY-32、Mouse Ascites Fluid(Sigma-Aldrich社製)を混合して、冷蔵で一晩反応させ、二次抗体としてEnvision +Dual Link System-HRP(Dako社製)を用いて、ジアミノベンジジン(DAB)で可視化し、ヘマトキシリンで対比染色した。結果を図6に示す。
Claims (14)
- 500μg/cm2~10mg/cm2の生体親和性高分子フィルムと、前記生体親和性高分子フィルムの少なくとも一方の表面上に配置された細胞シートとを含む、積層体。
- 生体親和性高分子フィルムが、下記式1を満たす、請求項1に記載の積層体。
式1:(膨潤時膜厚/乾燥時膜厚)×100≧-27.5×乾燥時膜厚+880
但し、膨潤時膜厚および乾燥時膜厚の単位はμmである。 - 生体親和性高分子フィルムが、下記式2を満たす、請求項1または2に記載の積層体。
式2:(膨潤時膜厚/乾燥時膜厚)×100≧-27.5×乾燥時膜厚+962.5
但し、膨潤時膜厚および乾燥時膜厚の単位はμmである。 - 生体親和性高分子フィルムの下記式3で示される膨潤率が230%以上である、請求項1~3の何れか一項に記載の積層体。
式3:(膨潤時膜厚/乾燥時膜厚)×100
但し、膨潤時膜厚および乾燥時膜厚の単位はμmである。 - 生体親和性高分子フィルムの乾燥時膜厚が、5~200μmである、請求項1~4のいずれか一項に記載の積層体。
- 生体親和性高分子フィルムの湿潤時膜厚が、50~500μmである、請求項1~5のいずれか一項に記載の積層体。
- 細胞が、心筋細胞または骨格筋芽細胞である、請求項1~6のいずれか一項に記載の積層体。
- 生体親和性高分子が、リコンビナントゼラチンである、請求項1~7のいずれか一項に記載の積層体。
- リコンビナントゼラチンが、下記式4で示される、請求項8に記載の積層体。
式4: A-[(Gly-X-Y)n]m-B
式中、Aは任意のアミノ酸またはアミノ酸配列を示し、Bは任意のアミノ酸またはアミノ酸配列を示し、n個のXはそれぞれ独立にアミノ酸のいずれかを示し、n個のYはそれぞれ独立にアミノ酸のいずれかを示し、nは3~100の整数を示し、mは2~10の整数を示す。なお、n個のGly-X-Yはそれぞれ同一でも異なっていてもよい。 - リコンビナントゼラチンが、下記式5で示される、請求項8または9に記載の積層体。
式5: Gly-Ala-Pro-[(Gly-X-Y)63]3-Gly
式中、63個のXはそれぞれ独立にアミノ酸の何れかを示し、63個のYはそれぞれ独立にアミノ酸の何れかを示す。なお、63個のGly-X-Yはそれぞれ同一でも異なっていてもよい。 - リコンビナントゼラチンが、(1)配列番号1に記載のアミノ酸配列、または(2)配列番号1に記載のアミノ酸配列と80%以上の配列同一性を有し、生体親和性を有するアミノ酸配列を有する、請求項8~10のいずれか一項に記載の積層体。
- リコンビナントゼラチンが、配列番号1に記載のアミノ酸配列を有する、請求項8~11のいずれか一項に記載の積層体。
- 請求項1~12のいずれか一項に記載の積層体を含む、心疾患治療剤。
- 500μg/cm2~10mg/cm2の生体親和性高分子フィルムからなる、細胞シート積層用フィルム。
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JP2018509315A JP6682620B2 (ja) | 2016-03-29 | 2017-03-27 | 細胞シートを含有する積層体、心疾患治療剤および細胞シート積層用フィルム |
EP17774880.3A EP3438246B1 (en) | 2016-03-29 | 2017-03-27 | Laminate containing cell sheet, agent for treating cardiac diseases, and film for being laminated on cell sheet |
CN201780019950.0A CN109089422B (zh) | 2016-03-29 | 2017-03-27 | 含有细胞片的层叠体、心脏疾病治疗剂及细胞片层叠用薄膜 |
US16/139,814 US20190008791A1 (en) | 2016-03-29 | 2018-09-24 | Laminate containing cell sheet, agent for treating cardiac diseases, and film for being laminated on cell sheet |
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JP2008538707A (ja) * | 2005-04-06 | 2008-11-06 | フジフィルム マニュファクチャリング ユーロプ ビー.ブイ. | 細胞培養用非孔質フィルム |
JP2010519251A (ja) * | 2007-02-21 | 2010-06-03 | フジフィルム・マニュファクチュアリング・ヨーロッパ・ベスローテン・フエンノートシャップ | 組換えゼラチン |
WO2014104366A1 (ja) * | 2012-12-27 | 2014-07-03 | 新田ゼラチン株式会社 | ヒト角膜内皮細胞シート |
WO2014192909A1 (ja) * | 2013-05-31 | 2014-12-04 | iHeart Japan株式会社 | ハイドロゲルを組み込んだ積層化細胞シート |
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US20120263681A1 (en) * | 2011-04-12 | 2012-10-18 | Fujifilm Corporation | Composition comprising cell and biocompatible polymer |
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WO2014104366A1 (ja) * | 2012-12-27 | 2014-07-03 | 新田ゼラチン株式会社 | ヒト角膜内皮細胞シート |
WO2014192909A1 (ja) * | 2013-05-31 | 2014-12-04 | iHeart Japan株式会社 | ハイドロゲルを組み込んだ積層化細胞シート |
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