WO2016027850A1 - 間葉系幹細胞用培地 - Google Patents
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Definitions
- the present invention relates to a mesenchymal stem cell culture medium, a mesenchymal stem cell culture method, and the like.
- a mesenchymal stem cell is a type of somatic stem cell that exists in adult bone marrow, etc., and is defined as an adherent cell having the ability to differentiate into bone, cartilage, and adipocyte.
- embryonic stem cells such as embryonic stem (ES) cells and induced pluripotent stem (iPS) cells
- ES embryonic stem
- iPS induced pluripotent stem
- Non-Patent Document 1 reports that the senescence of human mesenchymal stem cells (hMSC) can be suppressed by culturing under low oxygen partial pressure, but the amino acid composition of the medium is senescent of human mesenchymal stem cells. It is completely unknown what kind of effect it has on growth.
- Patent Documents 1 and 2 disclose examples of stem cell culture techniques by removing specific amino acids from the medium. These are technologies related to pluripotent stem cells such as ES cells and iPS cells, which selectively kill and remove undifferentiated cells remaining at the time of differentiation induction, and increase the purity of those differentiated in the cell composition. is there. To date, in any stem cell, regardless of whether it is a somatic stem cell or a pluripotent stem cell, there are known examples in which the removal of a specific amino acid from the medium suppresses aging of the cell or promotes its proliferation. Not.
- an object of the present invention is to provide a means for proliferating mesenchymal stem cells, particularly human mesenchymal stem cells, for a longer period of time than before without using a special device or equipment.
- the present inventors have found that glycine, alanine, serine, proline, asparagine, aspartic acid, and glutamic acid are reduced between humans in a culture solution in which the amount of seven non-essential amino acids such as glutamic acid is reduced. It has been found that when cultivating mesenchymal stem cells, it becomes possible to proliferate and culture for a longer period of time than when cultured in a normal culture solution in which the amount of the non-essential amino acids is not reduced, and more mesenchymal stem cells can be obtained. It was.
- the present invention has been completed based on the above findings. That is, the present invention is as follows.
- [1] Mesenchymal stem cells in which the concentration of at least one amino acid is less than 5 ⁇ M glycine, less than 5 ⁇ M alanine, less than 3 ⁇ M serine, less than 5 ⁇ M proline, less than 1 ⁇ M aspartate, less than 2 ⁇ M aspartate, and / or less than 3 ⁇ M glutamate Medium.
- [3] The medium according to [1] above, wherein glycine is less than 1 ⁇ M.
- Glycine is less than 1 ⁇ M
- alanine is less than 1 ⁇ M
- serine is less than 0.7 ⁇ M
- proline is less than 1 ⁇ M
- asparagine is less than 0.1 ⁇ M
- aspartic acid is less than 0.5 ⁇ M
- glutamic acid is less than 0.7 ⁇ M.
- the culture method according to [24], wherein the step of culturing mesenchymal stem cells is a step of growing mesenchymal stem cells over 70 days or more.
- the cell composition according to [26] which is positive for at least one marker selected from the group consisting of CD73, CD90, and CD105.
- the above [26] which is positive for at least one marker selected from the group consisting of CD73, CD90 and CD105, and is negative for CD45, CD34, CD14, CD11b, CD79, CD19 and HLA-DR The cell composition described.
- arginine, cysteine, glutamine, and tyrosine are further added.
- the present invention it is possible to proliferate and culture mesenchymal stem cells over a long period of time, which has been difficult until now. Therefore, more mesenchymal stem cells can be easily obtained, and a large amount of mesenchymal stem cells can be supplied for use in research, medical treatment, and the like.
- FIG. 1 is a graph showing the effect of promoting cell proliferation in a 7-day culture of human mesenchymal stem cells (lot number: OF3825) using the medium of the present invention.
- FIG. 2 is a graph showing the effect of promoting cell proliferation in culture of human mesenchymal stem cells (lot number: OF3825) for about 70 days by the medium of the present invention.
- FIG. 3 is a diagram showing the cell proliferation promoting effect of human mesenchymal stem cells (lot numbers: OF3853 and OF4266) in about 30 days by the medium of the present invention.
- FIG. 4 is a graph showing the effect of promoting cell proliferation in 109 days from the first passage of human mesenchymal stem cells (lot number: BM103) by the medium of the present invention.
- FIG. 5 is a graph showing the differentiation-promoting effect of human mesenchymal stem cells (lot numbers: BM103PN2 (FIG. 5A) and BM105PN2 (FIG. 5B)) cultured in the medium of the present invention into adipocytes.
- the present invention relates to a mesenchymal stem cell medium (hereinafter referred to as “the present invention”) in which the amount of at least one amino acid selected from the group consisting of glycine, alanine, serine, proline, asparagine, aspartic acid and glutamic acid is reduced. May be abbreviated as “medium”. More specifically, the concentration of at least one amino acid is less than 5 ⁇ M glycine, less than 5 ⁇ M alanine, less than 3 ⁇ M serine, less than 5 ⁇ M proline, less than 1 ⁇ M asparagine, less than 2 ⁇ M aspartate, and / or less than 3 ⁇ M glutamate.
- a medium for leaf stem cells is provided.
- the amino acid described in this specification means any of L-form, D-form and DL-form, and means not only a free form of each amino acid but also a salt form.
- salt forms include acid addition salts and salts with bases, and are preferably salts that do not exhibit cytotoxicity and are acceptable as pharmaceuticals.
- acids that form such salts include inorganic acids such as hydrogen chloride, hydrogen bromide, sulfuric acid, and phosphoric acid, and organic acids such as acetic acid, lactic acid, citric acid, tartaric acid, maleic acid, fumaric acid, and monomethyl sulfuric acid.
- bases that form such salts include metal hydroxides or carbonates such as sodium, potassium, and calcium, inorganic bases such as ammonia, ethylenediamine, propylenediamine, ethanolamine, Examples include organic bases such as monoalkylethanolamine, dialkylethanolamine, diethanolamine, and triethanolamine.
- the salt may be a hydrate (hydrated salt).
- At least one amino acid selected from the group consisting of glycine, alanine, serine, proline, asparagine, aspartic acid and glutamic acid are collectively referred to as “the present invention.
- the amount of amino acids to be reduced may be reduced.
- “reduced” means less than the amount used in a general medium, and to the extent that long-term growth culture of mesenchymal stem cells is possible. It means that the content is kept low.
- Examples of the amount used in a general medium include 133 to 667 ⁇ M for glycine, 50 to 400 ⁇ M for alanine, 238 to 400 ⁇ M for serine, 150 to 400 ⁇ M for proline, and asparagine. 50 to 400 ⁇ M, 50 to 400 ⁇ M for aspartic acid, and 50 to 510 ⁇ M for glutamic acid.
- the basal medium used in preparing the medium of the present invention and the additives added thereto do not contain the reduced amino acids of the present invention or are reduced according to the present invention. It is preferable that an operation for removing low molecules such as amino acids is performed.
- the medium of the present invention is substantially free of at least one of the amino acids to be reduced of the present invention, more preferably all seven.
- “Substantially free” means using a basal medium and an additive thereof that do not contain the amino acid to be reduced of the present invention or have been subjected to an operation for removing small molecules such as the amino acid to be reduced of the present invention.
- This means that the final concentration of the reduced amino acid of the present invention in the medium of the present invention is kept as low as possible, and preferably the concentration in the medium of the present invention is the detection limit.
- concentrations are:
- the amino acid can be detected by an amino acid analysis method based on the ninhydrin method (see, for example, Clinical Chemistry (1997), Vol. 43, No.
- the “concentration below the detection limit” means a concentration that cannot be detected by the amino acid analysis method based on the ninhydrin method.
- concentration of each amino acid in the reduced amino acids of the present invention include glycine less than 5 ⁇ M, preferably less than 1 ⁇ M, more preferably less than 0.8 ⁇ M, alanine less than 5 ⁇ M, preferably less than 1 ⁇ M, more preferably Is less than 0.8 ⁇ M, serine is less than 3 ⁇ M, preferably less than 0.7 ⁇ M, more preferably less than 0.4 ⁇ M, proline is less than 5 ⁇ M, preferably less than 1 ⁇ M, more preferably less than 0.7 ⁇ M, and asparagine is less than 1 ⁇ M, preferably Is less than 0.1 ⁇ M, more preferably less than 0.06 ⁇ M, aspartic acid is less than 2 ⁇ M, preferably less than
- the amount thereof is reduced for 1, 2, 3, 4, 5, 6 or 7 of the 7 amino acids to be reduced of the present invention. Any combination of amino acids may be used when the amount of amino acids is reduced. In a preferred embodiment, the amount of all seven amino acids is reduced in the medium of the present invention.
- the content of amino acids other than the amino acid to be reduced in the present invention in the medium of the present invention is not particularly limited as long as it does not inhibit the growth of mesenchymal stem cells, and the concentration used for normal cell culture is appropriately adopted. obtain.
- the medium of the present invention may be a basal medium known per se and is not particularly limited as long as it does not inhibit the growth of mesenchymal stem cells.
- DMEM fetal calf serum
- EMEM fetal calf serum
- IMDM Scove's Modified Dulbecco's Medium
- GMEM Glasgow's MEM
- RPMI-1640 ⁇ -MEM
- a medium modified for mesenchymal stem cell culture a mixture of the above basal medium and another medium, or the like may be used. If desired, the medium may be subjected to an operation for removing low molecules such as the reduced amino acids of the present invention.
- the medium of the present invention can contain additives known per se.
- the additive is not particularly limited as long as it does not inhibit the proliferation of mesenchymal stem cells.
- a growth factor such as insulin
- an iron source such as transferrin
- a polyamine such as putrescine
- a mineral For example, sodium selenate, etc.
- sugars eg, glucose, etc.
- organic acids eg, pyruvic acid, lactic acid, etc.
- amino acids other than the amino acids to be reduced eg, L-glutamine, etc.
- reducing agents eg, 2-mercapto) Ethanol, etc.
- vitamins eg ascorbic acid, d-biotin etc.
- steroids eg ⁇ -estradiol, progesterone etc.
- antibiotics eg streptomycin, penicillin, gentamicin etc.
- buffers eg HEPES etc.
- additives known per se that have been conventionally used for culturing mesenchymal stem cells can also be included as appropriate. Each additive is preferably contained within a concentration range known per se.
- the medium of the present invention may contain serum.
- the serum is not particularly limited as long as it is an animal-derived serum, as long as it does not inhibit the growth of mesenchymal stem cells, but is preferably a mammal-derived serum (eg, fetal bovine serum, human serum, etc.), and more Human serum is preferable.
- the serum concentration may be within a concentration range known per se.
- mesenchymal stem cells after culture are used for medical purposes, other animal-derived components may become infection sources of blood-borne pathogens and heterologous antigens, so a medium that does not contain serum is also preferably used. obtain.
- serum In the case where serum is not included, an alternative additive of serum (for example, Knockout Serum Replacement (KSR) (Invitrogen), Chemically-defined Lipid concentrated (Gibco), etc.) may be used. It is preferable that the serum and the serum replacement additive are those that do not contain the amino acid to be reduced of the present invention or that have been subjected to an operation for removing low molecules such as the amino acid to be reduced of the present invention.
- KSR Knockout Serum Replacement
- Sibco Chemically-defined Lipid concentrated
- “medium mesenchymal stem cell culture medium containing serum or serum substitute that has been subjected to low-molecular removal treatment without adding the reduced amino acid of the present invention” can be mentioned.
- An amino acid other than the amino acid to be reduced of the present invention specifically, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine may be optionally added to the medium. It is preferable that Further, arginine, cysteine, glutamine and tyrosine may be added if desired, and it is preferable to add them.
- the medium of the present invention is not suitable because it may cause infection with pathogenic bacteria or become a heterologous antigen. More preferably, no human animal-derived component is contained.
- the above “operation for removing low molecules such as reduced amino acids of the present invention” can be performed as long as the reduced amino acids of the present invention can be removed while maintaining the desired effect of the sample subjected to the operations.
- Any method such as dialysis and gel filtration may be used.
- a reagent used for medium preparation that contains medium components other than amino acids (salts, vitamins, etc.), and an amino acid other than the amino acid to be reduced according to the present invention is necessary for the growth of mesenchymal stem cells.
- Stem cell means an immature cell having self-renewal ability and differentiation / proliferation ability.
- Stem cells include subpopulations such as pluripotent stem cells, multipotent stem cells, unipotent stem cells, and the like, depending on differentiation ability.
- a pluripotent stem cell means a cell having an ability to differentiate into all tissues and cells constituting a living body.
- a multipotent stem cell means a cell having the ability to differentiate into multiple types of tissues and cells, although not all types.
- a unipotent stem cell means a cell having the ability to differentiate into a specific tissue or cell.
- the mesenchymal stem cells targeted in the present invention are a kind of multipotent stem cells that can differentiate into adipocytes, bone cells, chondrocytes, muscle cells, hepatocytes, nerve cells, and the like, such as ES cells and iPS cells. Unlike pluripotent stem cells, it is known as a cell having a low possibility of forming a tumor when transplanted into a living body.
- the mesenchymal stem cell in the present invention may be a mesenchymal stem cell collected from bone marrow, and may preferably be positive for one or more mesenchymal stem cell markers (eg, CD73, CD90, CD105, etc.), more preferably.
- molecules that are positive for the marker and that are not expressed in mesenchymal stem cells May be negative for the expression of molecules that are positive for the marker and that are not expressed in mesenchymal stem cells.
- molecules that are not expressed in mesenchymal stem cells include CD45, CD34, CD14, CD11b, CD79, CD19, HLA-DR, and the like.
- the medium of the present invention can be suitably used for the growth of mesenchymal stem cells derived from any animal.
- Mesenchymal stem cells that can be cultured using the medium of the present invention include, for example, rodents such as mice, rats, hamsters, and guinea pigs, rabbits such as rabbits, pigs, cows, goats, horses, sheep, and the like. It is a mesenchymal stem cell derived from a primate such as a hoofed eye, a dog or a cat, a human, a monkey, a rhesus monkey, a marmoset, an orangutan, or a chimpanzee, and preferably a mesenchymal stem cell derived from a human.
- the medium of the present invention is preferably a medium for growth culture of mesenchymal stem cells.
- the “medium for growth culture” is a medium that enables the cells to replicate (ie, proliferate) while maintaining the self-renewal ability and differentiation multipotency of mesenchymal stem cells. Therefore, the mesenchymal stem cells cultured in the medium of the present invention are characterized by maintaining their proliferation ability.
- proliferative ability means that the ability to divide cells is not lost due to cell senescence or the like.
- the majority of cells in culture (for example, 60% in the cell composition) , Preferably 70%, more preferably 80%, even more preferably 90%, most preferably 100% of cells) are negative for cell senescence markers (eg increased senescence-related ⁇ -galactosidase activity, etc.)
- the majority of the cells in it (eg, 60%, preferably 70%, more preferably 80%, even more preferably 90%, most preferably 100% of the cells in the cell composition) are G1, S, When it belongs to either G2 or M phase, it can be said that the cell maintains the proliferative ability.
- mesenchymal stem cells can be efficiently cultured in the long term while maintaining the proliferation ability.
- the culture medium of the present invention enables mesenchymal stem cells to be cultured while maintaining the proliferation ability for 50 days or more, preferably 70 days or more, more preferably 87 days or more, and even more preferably 118 days or more.
- the proliferation ability of mesenchymal stem cells is not lost, a large amount of mesenchymal stem cells can be obtained by culturing.
- the culture medium of the present invention it is possible to obtain a larger amount of mesenchymal stem cells than in the past, and for example, it is possible to obtain mesenchymal stem cells that are 1230 times the number of cells at the start of culture.
- the mesenchymal stem cells cultured in the medium of the present invention have the same degree of differentiation into bone cells as compared to mesenchymal stem cells cultured in the conventional medium.
- Differentiation into bone cells is performed, for example, in a bone differentiation induction medium (for example, DMEM medium supplemented with 10 (v / v)% FBS, 100 nM dexamethasone, 50 ⁇ M L-ascorbic acid-2-phosphate, 10 mM ⁇ -glycerophosphate). It can be performed by culturing mesenchymal stem cells. Whether or not they have differentiated into bone cells can be confirmed by detecting the deposition of calcium ions in the bone tissue by Arizalin Red staining.
- mesenchymal stem cells cultured in the medium of the present invention have the same level of differentiation ability into chondrocytes as compared to mesenchymal stem cells cultured in conventional media.
- Differentiation into chondrocytes can be performed, for example, by adding 10 ng / mL TGF- ⁇ 3 to a cartilage differentiation kit (Lonza: PT-3003). Whether or not they have differentiated into chondrocytes can be confirmed, for example, by detecting the production of glucosaminoglycan using a commercially available glucosaminoglycan measurement kit or the like.
- the mesenchymal stem cells cultured in the medium of the present invention can have an increased ability to differentiate into adipocytes compared to mesenchymal stem cells cultured in conventional media.
- Differentiation into adipocytes can be achieved, for example, by adding a fat differentiation induction medium (for example, 10 (v / v)% FBS, 0.01 mg / mL insulin, 1 ⁇ M dexamethasone, 0.2 mM indomethacin, 0.5 mM isobutylmethylxanthine. It can be achieved by culturing mesenchymal stem cells in a glucose-containing DMEM medium). Whether or not they have differentiated into adipocytes can be confirmed, for example, by detecting the production of triglyceride using a commercially available triglyceride measurement kit or the like.
- the present invention provides a method for culturing mesenchymal stem cells (hereinafter sometimes referred to as “the culture method of the present invention”), which comprises the step of culturing mesenchymal stem cells in the medium of the present invention. To do.
- the incubator used for culturing mesenchymal stem cells is not particularly limited as long as it can cultivate mesenchymal stem cells. Flask, tissue culture flask, dish, petri dish, tissue culture dish, multi-dish , Microplates, microwell plates, multiplates, multiwell plates, microslides, chamber slides, petri dishes, tubes, trays, culture bags, and roller bottles.
- the incubator may be cell-adhesive or non-cell-adhesive and is appropriately selected according to the purpose.
- the cell-adhesive incubator can be coated with any cell-supporting substrate such as an extracellular matrix (ECM) for the purpose of improving adhesion with cells on the surface of the incubator.
- ECM extracellular matrix
- the substrate for cell support can be any substance intended for adhesion of mesenchymal stem cells, such as Matrigel using ECM, collagen, gelatin, poly-L-lysine, poly-D-lysine, laminin, fibronectin, etc. Is mentioned.
- the culture temperature is not particularly limited, but may be about 30-40 ° C., preferably about 37 ° C.
- the CO 2 concentration can be about 1-10%, preferably about 2-5%.
- the oxygen concentration can be 1-20%, preferably 1-10%.
- the culture method of the present invention may further comprise a step of growing mesenchymal stem cells over 50 days, preferably 70 days or more, more preferably 87 days or more, and even more preferably 118 days or more.
- a large amount of mesenchymal stem cells can be obtained by performing the long-term culture. For example, cells at the start of culture It is possible to obtain mesenchymal stem cells that are 1230 times the number of cells.
- the present invention also provides a cell composition obtained by the culture method of the present invention (hereinafter also referred to as “cell composition of the present invention”).
- cell composition of the present invention Most of the cell composition of the present invention (for example, 60%, preferably 70%, more preferably 80%, still more preferably 90%, most preferably 100% of cells in the cell composition) is undifferentiated. It is preferably a mesenchymal stem cell. Examples of known markers for mesenchymal stem cells include CD73, CD90 and CD105. Therefore, the cell composition of the present invention is mostly composed of 60%, preferably 70%, more preferably 80%, more preferably 90%, most preferably 100% of cells in the cell composition. , CD73, CD90 and CD105, preferably any two combinations, more preferably positive for all three markers.
- the cell composition of the present invention does not express a molecule that is not expressed in mesenchymal stem cells.
- Molecules that are not expressed in mesenchymal stem cells include, for example, CD45 (expressed in hematopoietic stem cells), CD34 (expressed in hematopoietic stem cells), CD14 (expressed in monocytes, macrophages), CD11b (monocytes, Expressed in macrophages, NK cells, granulocytes), CD79 (expressed in B cells), CD19 (expressed in B cells) and HLA-DR (expressed in dendritic cells, B cells, monocytes, macrophages), etc. Is mentioned.
- the cell composition of the present invention comprises a majority (eg, 60%, preferably 70%, more preferably 80%, more preferably 90%, most preferably 100% of the cell composition).
- Cells are negative for the expression of molecules that are not expressed in mesenchymal stem cells.
- the cells obtained by the culture method of the present invention can be suitably used for medical purposes such as cell medicine.
- the cells can be used in an undifferentiated state or after being differentiated into bone cells, chondrocytes, fat cells or the like depending on the target disease.
- target diseases include lunar bone non-rotating necrosis, femoral head non-rotating necrosis, intractable osteochondritis, lumbar disc herniation, ischemic heart disease, epidermolysis bullosa and the like.
- the cells can also be used for cosmetic surgery after being differentiated into fat cells.
- animals that are subject to cell therapy include laboratory animals such as rodents such as mice, rats, hamsters, guinea pigs, and rabbits, domestic animals such as pigs, cows, goats, horses, sheep, minks, dogs, cats, etc. Primates such as pets, humans, monkeys, rhesus monkeys, marmosets, orangutans, chimpanzees, etc., preferably humans.
- the dose and administration method of the cells in the cell therapy are not particularly limited as long as a desired effect can be obtained, and should be appropriately set according to the disease or symptom to be treated, the animal to be administered, etc. Can do.
- a medium composed of components (salts, vitamins, etc.) constituting DMEM (Dulbecco's modified Eagle medium, GIBCO) other than amino acids.
- DMEM Dulbecco's modified Eagle medium
- Medium in which 20 kinds of amino acids are added hereinafter sometimes referred to as “Full medium”
- Full medium or glycine, alanine, serine, proline, asparagine, aspartic acid and glutamic acid.
- Medium supplemented with 13 types of amino acids hereinafter sometimes referred to as “ ⁇ 7 medium”
- FBS fetal bovine serum, Life Technologies, Inc.
- Table 1 shows the concentrations of the above seven amino acids after dialysis in the serum used for the culture, the final concentrations of these amino acids when used when added to the -7 medium, and the concentrations of these amino acids in a general medium. Indicates.
- Mesenchymal stem cells were cultured in an incubator at 37 ° C. in a 5% CO 2 atmosphere.
- a fat maintenance medium (10 (v / v)% FBS (Life Technologies: 26400-044), 0.01 mg / mL insulin (Nacalai Tesque: 19251-95) was added. High glucose-containing DMEM medium (GIBCO)) was used. Differentiation culture from mesenchymal stem cells to adipocytes and maintenance culture after differentiation were performed in an incubator at 37 ° C. in a 5% CO 2 atmosphere.
- Adipocyte differentiation induction and differentiation efficiency measurement Mesenchymal stem cells were seeded at 2 ⁇ 10 5 cells per well of a 6-well plate and cultured until 100% confluent in a mesenchymal stem cell medium. Subsequently, the medium was changed to a fat differentiation induction medium and cultured for 3 days, and then the medium was changed to a fat maintenance medium and further cultured for 3 days. The culture for a total of 6 days with this fat differentiation induction medium and fat maintenance medium was carried out for a total of 18 days for 3 cycles. The cultured cells were fixed with 10% formalin and then subjected to oil red O staining.
- Thesit registered trademark
- Thesit (registered trademark) (Lauromacrogol)
- the triglyceride amount was quantified with a serum triglyceride measurement kit (Sigma: TR0100-1KT).
- Proteins were quantified using a BCA (bicinchoninic acid) reagent, and the differentiation efficiency for each cell was examined by comparing the amount of triglyceride per amount of protein.
- Example 1 Effect of promoting cell proliferation of mesenchymal stem cells by short-term culture in -7 medium (FIG. 1)
- Human mesenchymal stem cells (lot number: OF3825) were cultured in Zero medium, Full medium, or -7 medium for 7 days, and the number of cells was evaluated. The number of cells was measured by CCK assay. A commercially available kit, Cell counting kit-8 (Dojindo), was used, and the operation was performed according to the instruction manual attached to the kit. In the CCK assay, the number of cells is proportional to OD450 nm (vertical axis).
- Each medium was evaluated in 3 wells. The value of each well was represented by ⁇ , and the average value of 3 wells was represented by ⁇ . It was found that the growth of mesenchymal stem cells was remarkably promoted in the -7 medium as compared with the culture in the Full medium.
- Example 2 Effect of promoting cell proliferation of mesenchymal stem cells by long-term culture in -7 medium (FIG. 2)
- Human mesenchymal stem cells (lot number: OF3825) were cultured in -7 medium or Full medium for 70 days, and the cumulative number of cells when cultured in each medium was counted.
- the cells were detached from the culture vessel by trypsin treatment, mixed with trypan blue, and then the cell suspension was subjected to a hemocytometer to count the number of cells.
- the number of cells was measured in the same manner in the following examples. Compared with the culture in the Full medium, the number of accumulated cells was significantly increased in the culture in the -7 medium. Therefore, it was shown that the -7 medium is a medium suitable for long-term growth culture of mesenchymal stem cells.
- Example 3 Effect of promoting cell growth by culturing mesenchymal stem cells of different lots in -7 medium (FIG. 3) Human mesenchymal stem cells of lot number: OF3853 and lot number: OF4266 were cultured in -7 medium or full medium for 30 days, and the cumulative number of cells was counted. For both lots of human mesenchymal stem cells, a significant growth promoting effect was observed with the -7 medium.
- Example 4 Examination of proliferative culture period in the culture of mesenchymal stem cells in Full medium (FIG. 4) Human mesenchymal stem cells (lot number: BM103) were cultured for 109 days using ⁇ 7 medium or Full medium, and the cumulative number of cells was counted. In the culture with -7 medium, the cumulative number of cells continued to grow without reaching a peak, whereas when cultured in the Full medium, the cumulative number of cells reached a peak after 70 days from the start of the culture. became. In the culture in the Full medium, the final cumulative number of cells was 1230 times the number of cells at the start of the culture by the culture until reaching the peak. Therefore, it was found that the period during which mesenchymal stem cells can be grown and cultured in the Full medium is about 70 days, and the cumulative number of cells in that case is about 1230 times the number of cells at the start of culture.
- Reference Example 1 Promotion of differentiation of mesenchymal stem cells cultured in -7 medium into adipocytes (FIG. 5) Differentiation into adipocytes, bone cells or chondrocytes using human mesenchymal stem cells (lot numbers: BM103PN2 (FIG. 5A) and BM105PN2 (FIG. 5B)) cultured for 20 to 24 days in ⁇ 7 medium or Full medium Guidance was performed. Regarding differentiation into bone cells and chondrocytes, mesenchymal stem cells cultured in -7 medium showed similar differentiation efficiency compared to those cultured in Full medium.
- the mesenchymal stem cells cultured in -7 medium had significantly higher differentiation efficiency than those cultured in Full medium (FIG. 5). Therefore, the ⁇ 7 medium enables differentiation into mesenchymal stem cells into bone cells and chondrocytes, while maintaining the same differentiation potential as that of the conventional medium, and enables more efficient differentiation into adipocytes. It was shown to be a culture medium.
- mesenchymal stem cells can be proliferated and cultured for a long time without aging, and are particularly useful when a large amount of mesenchymal stem cells are required.
- the mesenchymal stem cells cultured according to the present invention can be suitably used for applications such as cell medicine.
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Abstract
Description
[1]少なくとも1種のアミノ酸の濃度が、グリシン5μM未満、アラニン5μM未満、セリン3μM未満、プロリン5μM未満、アスパラギン1μM未満、アスパラギン酸2μM未満、および/またはグルタミン酸3μM未満である、間葉系幹細胞用培地。
[2]グリシンが5μM未満である、上記[1]に記載の培地。
[3]グリシンが1μM未満である、上記[1]に記載の培地。
[4]アラニンが5μM未満である、上記[1]~[3]のいずれかに記載の培地。
[5]アラニンが1μM未満である、上記[1]~[3]のいずれかに記載の培地。
[6]セリンが3μM未満である、上記[1]~[5]のいずれかに記載の培地。
[7]セリンが0.7μM未満である、上記[1]~[5]のいずれかに記載の培地。
[8]プロリンが5μM未満である、上記[1]~[7]のいずれかに記載の培地。
[9]プロリンが1μM未満である、上記[1]~[7]のいずれかに記載の培地。
[10]アスパラギンが1μM未満である、上記[1]~[9]のいずれかに記載の培地。
[11]アスパラギンが0.1μM未満である、上記[1]~[9]のいずれかに記載の培地。
[12]アスパラギン酸が2μM未満である、上記[1]~[11]のいずれかに記載の培地。
[13]アスパラギン酸が0.5μM未満である、上記[1]~[11]のいずれかに記載の培地。
[14]グルタミン酸が3μM未満である、上記[1]~[13]のいずれかに記載の培地。
[15]グルタミン酸が0.7μM未満である、上記[1]~[13]のいずれかに記載の培地。
[16]グリシンが5μM未満、アラニンが5μM未満、セリンが3μM未満、プロリンが5μM未満、アスパラギンが1μM未満、アスパラギン酸が2μM未満、およびグルタミン酸が3μM未満である、上記[1]に記載の培地。
[17]グリシンが1μM未満、アラニンが1μM未満、セリンが0.7μM未満、プロリンが1μM未満、アスパラギンが0.1μM未満、アスパラギン酸が0.5μM未満、およびグルタミン酸が0.7μM未満である、上記[1]に記載の培地。
[18]低分子除去処理が施された血清または血清代替物を含有する、上記[1]~[17]のいずれかに記載の培地。
[19]前記低分子除去処理が透析により行われる、上記[18]に記載の培地。
[20]血清がヒト血清である、上記[18]または[19]に記載の培地。
[21]非ヒト動物由来の成分を含まない、上記[1]~[20]のいずれかに記載の培地。
[22]間葉系幹細胞が、ヒト間葉系幹細胞である上記[1]~[21]のいずれかに記載の培地。
[23]間葉系幹細胞が、骨髄より採取されたものである上記[22]に記載の培地。
[24]上記[1]~[23]のいずれかに記載の培地で間葉系幹細胞を培養する工程を含む、間葉系幹細胞の培養方法。
[25]間葉系幹細胞を培養する工程が、間葉系幹細胞を70日以上に亘り増殖させる工程である、上記[24]に記載の培養方法。
[26]上記[24]または[25]に記載の培養方法により得られる、細胞組成物。
[27]CD73、CD90およびCD105からなる群から選択される少なくとも1つのマーカーに陽性である、上記[26]に記載の細胞組成物。
[28]CD73、CD90およびCD105からなる群から選択される少なくとも1つのマーカーに陽性であり、かつ、CD45、CD34、CD14、CD11b、CD79、CD19およびHLA-DR陰性である、上記[26]に記載の細胞組成物。
[29]上記[24]または[25]に記載の培養方法により得られる、細胞医療用の細胞。
[30]グリシン、アラニン、セリン、プロリン、アスパラギン、アスパラギン酸およびグルタミン酸を添加せず、低分子除去処理が施された血清または血清代替物を含有する間葉系幹細胞用培地。
[31]ヒスチジン、イソロイシン、ロイシン、リジン、メチオニン、フェニルアラニン、トレオニン、トリプトファン、およびバリンを添加する、上記[30]に記載の培地。
[32]アルギニン、システイン、グルタミン、およびチロシンをさらに添加する、上記[31]に記載の培地。
1.細胞
LONZA社より購入した、正常ヒトドナーから採取、調製されたヒト間葉系幹細胞(カタログ番号:PT-2501)、および本発明者らが自主採取したヒト間葉系幹細胞(ロット番号:BM103~104)を使用した。
間葉系幹細胞の培養においては、アミノ酸以外のDMEM(Dulbecco’s modified Eagle medium、GIBCO)を構成する成分(塩類、ビタミンなど)からなる培地(以下、「Zero培地」と表記される場合がある)、これに20種類のアミノ酸を添加した培地(以下、「Full培地」と表記される場合がある)、もしくは、グリシン、アラニン、セリン、プロリン、アスパラギン、アスパラギン酸およびグルタミン酸を除いた13種類のアミノ酸を添加した培地(以下、「-7培地」と表記される場合がある)、それぞれの培地に、透析により低分子を除去したFBS(fetal bovine serum、ライフテクノロジーズ社:26400-044)を10(v/v)%となるように添加し、使用した。
表1には、培養に使用した血清中における透析後の、上記7種アミノ酸の濃度、これらアミノ酸の、-7培地に添加した際の使用時の最終濃度、一般的な培地におけるこれらアミノ酸の濃度を示す。
間葉系幹細胞から脂肪細胞への分化は、脂肪分化誘導培地(10(v/v)% FBS(ライフテクノロジーズ社:26400-044)、0.01mg/mL インスリン(ナカライテスク社:19251-95)、1μM デキサメタゾン(シグマ社:D2915)、0.2mM インドメタシン(シグマ社:I7378)、0.5mM イソブチルメチルキサンチン(シグマ社:I7018)を添加した高グルコース含有DMEM培地(GIBCO))を使用して行った。脂肪細胞への分化後の培養は、脂肪維持培地(10(v/v)% FBS(ライフテクノロジーズ社:26400-044)、0.01mg/mL インスリン(ナカライテスク社:19251-95)を添加した高グルコース含有DMEM培地(GIBCO))を使用して行った。
間葉系幹細胞から脂肪細胞への分化培養および分化後の維持培養は、37℃、5% CO2雰囲気下のインキュベーター内で行った。
間葉系幹細胞を、6ウェルプレートの1ウェルあたり2x105細胞を播種し、間葉系幹細胞用培地にて100%コンフルエントになるまで培養を行った。続いて脂肪分化誘導培地へ培地交換し、3日間培養した後に、脂肪維持培地へ培地交換し、更に3日間培養を行った。この脂肪分化誘導培地と脂肪維持培地による計6日間の培養を、3サイクル合計18日間実施した。
培養後の細胞を10% ホルマリンにて固定した後、オイルレッドO染色に供した。続いて細胞を0.1% Thesit(登録商標)(ラウロマクロゴール)に溶解し、血清トリグリセリド測定キット(シグマ社:TR0100-1KT)にてトリグリセリド量を定量した。BCA(ビシンコニン酸)試薬を用いてタンパク質を定量し、タンパク質量当たりのトリグリセリド量を比較することで、細胞ごとの分化効率を検討した。
実施例1:-7培地での短期間培養による、間葉系幹細胞の細胞増殖促進効果(図1)
Zero培地、Full培地または-7培地でヒト間葉系幹細胞(ロット番号:OF3825)を7日間培養し、細胞数を評価した。細胞数の計測はCCKアッセイにより行った。市販のキットであるCell counting kit-8 (Dojindo)を使用し、キット付属の使用説明書に順じて操作を行った。CCKアッセイでは、OD450nm(縦軸)に細胞数が比例する。各培地につき3ウェルで評価を行い、各ウェルの値を○で、3ウェルの平均値を●で表した。Full培地で培養した場合に比べ、-7培地では間葉系幹細胞の増殖が顕著に促進されていることを見出した。
-7培地またはFull培地でヒト間葉系幹細胞(ロット番号:OF3825)を70日間培養し、それぞれの培地で培養したときの累積細胞数を計測した。継代時に、細胞をトリプシン処理で培養容器から剥がし、トリパンブルーと混和した後、細胞懸濁液を血球計算盤に供し、細胞数を計測した。細胞数の計測は、以下の実施例においても同様の方法で行った。Full培地で培養した場合に比べ、-7培地で培養した場合は累積細胞数が顕著に増大した。従って、-7培地は、間葉系幹細胞の長期に渡る増殖培養に適した培地であることが示された。
ロット番号:OF3853およびロット番号:OF4266のヒト間葉系幹細胞を、-7培地またはFull培地において30日間培養し、累積細胞数を計測した。両ロットのヒト間葉系幹細胞について、-7培地による顕著な増殖促進効果が認められた。
-7培地またはFull培地を用いて、ヒト間葉系幹細胞(ロット番号:BM103)を109日間培養し、それぞれ累積細胞数を計測した。-7培地での培養では、累積細胞数が頭打ちとはならずに、増殖し続けたのに対し、Full培地で培養した場合は、培養開始から70日目以降は累積細胞数がほぼ頭打ちとなった。Full培地での培養において、頭打ちとなるまでの培養により、最終的な累積細胞数は培養開始時の細胞数の1230倍であった。よって、Full培地による間葉系幹細胞の増殖培養可能な期間は、およそ70日間で、その場合の累積細胞数は培養開始時の細胞数の1230倍程度であることが明らかとなった。
-7培地またはFull培地で20日~24日間培養したヒト間葉系幹細胞(ロット番号:BM103PN2(図5A)およびBM105PN2(図5B))を用いて、脂肪細胞、骨細胞または軟骨細胞への分化誘導を行った。骨細胞および軟骨細胞への分化に関しては、-7培地で培養した間葉系幹細胞は、Full培地で培養したものと比べ、同程度の分化効率を示した。脂肪細胞への分化に関しては、-7培地で培養した間葉系幹細胞は、Full培地で培養したものと比べ、分化効率が顕著に高かった(図5)。よって、-7培地は、間葉系幹細胞の骨細胞および軟骨細胞への分化に関しては従来の培地と同程度の分化能を維持しつつ、従来よりも効率のよい脂肪細胞への分化を可能とする培地であることが示された。
Claims (29)
- 少なくとも1種のアミノ酸の濃度が、グリシン5μM未満、アラニン5μM未満、セリン3μM未満、プロリン5μM未満、アスパラギン1μM未満、アスパラギン酸2μM未満、および/またはグルタミン酸3μM未満である、間葉系幹細胞用培地。
- グリシンが5μM未満である、請求項1に記載の培地。
- グリシンが1μM未満である、請求項1に記載の培地。
- アラニンが5μM未満である、請求項1に記載の培地。
- アラニンが1μM未満である、請求項1に記載の培地。
- セリンが3μM未満である、請求項1に記載の培地。
- セリンが0.7μM未満である、請求項1に記載の培地。
- プロリンが5μM未満である、請求項1に記載の培地。
- プロリンが1μM未満である、請求項1に記載の培地。
- アスパラギンが1μM未満である、請求項1に記載の培地。
- アスパラギンが0.1μM未満である、請求項1に記載の培地。
- アスパラギン酸が2μM未満である、請求項1に記載の培地。
- アスパラギン酸が0.5μM未満である、請求項1に記載の培地。
- グルタミン酸が3μM未満である、請求項1に記載の培地。
- グルタミン酸が0.7μM未満である、請求項1に記載の培地。
- グリシンが5μM未満、アラニンが5μM未満、セリンが3μM未満、プロリンが5μM未満、アスパラギンが1μM未満、アスパラギン酸が2μM未満、およびグルタミン酸が3μM未満である、請求項1に記載の培地。
- グリシンが1μM未満、アラニンが1μM未満、セリンが0.7μM未満、プロリンが1μM未満、アスパラギンが0.1μM未満、アスパラギン酸が0.5μM未満、およびグルタミン酸が0.7μM未満である、請求項1に記載の培地。
- 低分子除去処理が施された血清または血清代替物を含有する、請求項1~17のいずれか1項に記載の培地。
- 前記低分子除去処理が透析により行われる、請求項18に記載の培地。
- 血清がヒト血清である、請求項18または19に記載の培地。
- 非ヒト動物由来の成分を含まない、請求項1~20のいずれか1項に記載の培地。
- 間葉系幹細胞が、ヒト間葉系幹細胞である請求項1~21のいずれか1項に記載の培地。
- 間葉系幹細胞が、骨髄より採取されたものである請求項22に記載の培地。
- 請求項1~23のいずれか1項に記載の培地で間葉系幹細胞を培養する工程を含む、間葉系幹細胞の培養方法。
- 間葉系幹細胞を培養する工程が、間葉系幹細胞を70日以上に亘り増殖させる工程である、請求項24に記載の培養方法。
- 請求項24または25に記載の培養方法により得られる、細胞組成物。
- CD73、CD90およびCD105からなる群から選択される少なくとも1つのマーカーに陽性である、請求項26に記載の細胞組成物。
- CD73、CD90およびCD105からなる群から選択される少なくとも1つのマーカーに陽性であり、かつ、CD45、CD34、CD14、CD11b、CD79、CD19およびHLA-DR陰性である、請求項26に記載の細胞組成物。
- 請求項24または25に記載の培養方法により得られる、細胞医療用の細胞。
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WO2017188403A1 (ja) * | 2016-04-27 | 2017-11-02 | ロート製薬株式会社 | Cd201、cd46、cd56、cd147及びcd165からなる群より選択される少なくとも1種の細胞表面マーカーを発現する間葉系幹細胞及びその調製方法、並びに上記間葉系幹細胞を含む医薬組成物及びその調製方法 |
WO2018181342A1 (ja) * | 2017-03-28 | 2018-10-04 | 味の素株式会社 | 未分化維持培地添加剤 |
JP2022035915A (ja) * | 2020-08-21 | 2022-03-04 | 遵義医科大学附属医院 | 抗ヒト間葉系幹細胞老化およびその幹細胞性特徴増強方法 |
WO2023127824A1 (ja) | 2021-12-27 | 2023-07-06 | 住友ファーマ株式会社 | 神経堤細胞の培養方法及び製造方法 |
WO2024158058A1 (ja) * | 2023-01-27 | 2024-08-02 | 株式会社Rainbow | 自動培養装置における細胞増殖制御方法 |
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CN112300985B (zh) * | 2020-11-03 | 2022-07-01 | 中国人民解放军陆军军医大学第一附属医院 | 一种快速提升哺乳类动物骨髓间充质干细胞增殖效率的增殖培养基及增殖培养方法 |
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WO2017188403A1 (ja) * | 2016-04-27 | 2017-11-02 | ロート製薬株式会社 | Cd201、cd46、cd56、cd147及びcd165からなる群より選択される少なくとも1種の細胞表面マーカーを発現する間葉系幹細胞及びその調製方法、並びに上記間葉系幹細胞を含む医薬組成物及びその調製方法 |
JPWO2017188403A1 (ja) * | 2016-04-27 | 2019-03-07 | ロート製薬株式会社 | Cd201、cd46、cd56、cd147及びcd165からなる群より選択される少なくとも1種の細胞表面マーカーを発現する間葉系幹細胞及びその調製方法、並びに上記間葉系幹細胞を含む医薬組成物及びその調製方法 |
US11179420B2 (en) | 2016-04-27 | 2021-11-23 | Rohto Pharmaceutical Co., Ltd. | Method for treating a disease, comprising administering mesenchymal stem cells or culture supernatant thereof to a subject |
JP7108537B2 (ja) | 2016-04-27 | 2022-07-28 | ロート製薬株式会社 | Cd201、cd46、cd56、cd147及びcd165からなる群より選択される少なくとも1種の細胞表面マーカーを発現する間葉系幹細胞及びその調製方法、並びに上記間葉系幹細胞を含む医薬組成物及びその調製方法 |
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JP7407864B2 (ja) | 2016-04-27 | 2024-01-04 | ロート製薬株式会社 | Cd201、cd46、cd56、cd147及びcd165からなる群より選択される少なくとも1種の細胞表面マーカーを発現する間葉系幹細胞及びその調製方法、並びに上記間葉系幹細胞を含む医薬組成物及びその調製方法 |
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JP7119044B2 (ja) | 2020-08-21 | 2022-08-16 | 遵義医科大学附属医院 | 抗ヒト間葉系幹細胞老化およびその幹細胞性特徴増強方法 |
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KR20240125943A (ko) | 2021-12-27 | 2024-08-20 | 스미토모 파마 가부시키가이샤 | 신경능 세포의 배양 방법 및 제조 방법 |
WO2024158058A1 (ja) * | 2023-01-27 | 2024-08-02 | 株式会社Rainbow | 自動培養装置における細胞増殖制御方法 |
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JP6940837B2 (ja) | 2021-09-29 |
CA2958533A1 (en) | 2016-02-25 |
US20170198258A1 (en) | 2017-07-13 |
JP2020124218A (ja) | 2020-08-20 |
JPWO2016027850A1 (ja) | 2017-06-01 |
KR20170042367A (ko) | 2017-04-18 |
JP6944165B2 (ja) | 2021-10-06 |
CA2958533C (en) | 2023-03-14 |
EP3184627A4 (en) | 2018-04-18 |
CN106715683A (zh) | 2017-05-24 |
US10947508B2 (en) | 2021-03-16 |
EP3184627B1 (en) | 2020-12-23 |
EP3184627A1 (en) | 2017-06-28 |
KR102415441B1 (ko) | 2022-07-01 |
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