WO2015147047A1 - 多能性幹細胞培養用培地 - Google Patents
多能性幹細胞培養用培地 Download PDFInfo
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Definitions
- the present invention relates to a pluripotent stem cell culture medium that can maintain the undifferentiated state of pluripotent stem cells without containing serum or differentiation-suppressing proteins.
- Pluripotent stem cells such as iPS cells and ES cells are expected to be used for cell transplantation therapy, drug discovery, etc. and as a research tool for diseases because of their pluripotency and proliferation ability.
- pluripotent stem cells can self-replicate while maintaining an undifferentiated state almost indefinitely in the presence of serum or factors appropriate for the cells.
- differentiation-suppressing proteins such as bFGF and TGF ⁇ have been reported as factors suitable for human pluripotent stem cells.
- these differentiation-suppressing proteins are generally very expensive and the amount required to maintain an undifferentiated state is very large, so the use of pluripotent stem cells is greatly hindered from the cost aspect. .
- pluripotent stem cells with uniform properties are required, so it is desirable not to use proteins that are likely to have different properties from lot to lot as medium components.
- An object of the present invention is to provide a medium that has fewer protein components and can maintain the undifferentiated state of pluripotent stem cells. It is another object of the present invention to provide a medium that can be prepared at a lower cost. Furthermore, it aims at providing the culture medium which can proliferate a pluripotent stem cell more efficiently.
- the present inventors have found that the above problems can be solved by using a combination of a GSK3 ⁇ inhibitor and a DYRK inhibitor as medium components. It was also found that pluripotent stem cells can be proliferated more efficiently by further using NFAT inhibitors in combination. As a result of further studies based on these findings, the present invention has been completed.
- Item 1 A culture medium for pluripotent stem cell culture containing (A) GSK3 ⁇ inhibitor and (B) DYRK inhibitor.
- Item 2. Item 4. The medium according to Item 1, which does not contain serum.
- Item 3. Item 3.
- Item 4. Item 4. The medium according to any one of Items 1 to 3, wherein the protein component contained is only insulin and transferrin.
- Item 5. The medium according to any one of Items 1 to 4, wherein the component (A) is at least one selected from the group consisting of 1-AzaKenpaullone, Kenpaullone, and CHIR99021.
- Item 6. Item 6.
- Item 7. Item 7. The medium according to any one of Items 1 to 6, wherein the component (B) is at least one selected from the group consisting of ID-8, Harmine, and Indirubin analogues.
- Item 8. Item 8. The medium according to any one of Items 1 to 7, wherein the component (B) is ID-8.
- Item 9. The medium according to any one of Items 1 to 8, further comprising (C) an NFAT inhibitor.
- Item 11. Item 11. The medium according to any one of Items 1 to 10, which is used for culture in the absence of feeder cells.
- Item 12. The medium according to any one of Items 1 to 11, wherein the pluripotent stem cell is a primate-derived cell. Item 13. Item 13. A method for culturing pluripotent stem cells using the medium according to any one of Items 1 to 12. Item 14. A pluripotent stem cell differentiation inhibitor containing (A) a GSK3 ⁇ inhibitor and (B) a DYRK inhibitor.
- this culture medium can be prepared very cheaply compared with the existing culture medium which contains serum and a differentiation inhibitory protein as an essential component.
- proteins are likely to have different properties from lot to lot, according to the present invention, these protein components can be further reduced, and therefore a medium with less variation in performance between lots can be provided. Can do. Therefore, it is suitable for use in cell transplantation and the like that require pluripotent stem cells with uniform properties.
- This medium can proliferate pluripotent stem cells with the same or higher efficiency as the existing medium. Therefore, a certain number of pluripotent stem cells can be prepared at a lower cost.
- This medium can maintain an undifferentiated state as much as the presence of feeder cells and can proliferate cells even in the absence of feeder cells. Moreover, it can be used not only for adhesion culture but also for suspension culture.
- Example 1 The cell image observed in Example 1 is shown.
- the cell image observed in Example 1 is shown.
- A Cell images observed in Example 2 are shown.
- B The number of cell doublings measured in Example 2 is shown.
- A The cell image observed when the culture medium 1 of Example 3 was used is shown.
- B Cell images observed when using the medium 2 of Example 3.
- A The results of immunostaining in Example 4 are shown.
- B shows the results of flow cytometry in Example 4.
- C shows the results of karyotype analysis of Example 4.
- A The average division ratio of each passage measured in Example 5 is shown.
- B shows the results of flow cytometry in Example 5.
- C shows the results of quantitative PCR of Example 6.
- Example 7 The cell image observed in Example 7 are shown.
- B The cell image observed in the examination experiment of the cell peeling solution of Example 6 is shown.
- A Cell images observed in Example 7 are shown.
- B The number of cell doublings measured in Example 7 is shown.
- C shows the results of quantitative PCR of Example 7.
- A The iPS cell preparation scheme of Example 8 is shown.
- B ALP stained image observed in Example 8.
- C The iPS production efficiency measured in Example 8 is shown.
- D The cell image of the iPS cell produced in Example 8 is shown.
- E shows the result of immunostaining in Example 8.
- (A) GSK3 ⁇ inhibitor hereinafter also referred to as “(A) component” and (B) DYRK inhibitor (hereinafter also referred to as “(B) component”).
- Pluripotent stem cell culture medium hereinafter sometimes abbreviated as “medium of the present invention” and a pluripotent stem cell culture method using the same (hereinafter abbreviated as “culture method of the present invention”) ).
- GSK3 (beta) inhibitor will not be specifically limited if it is a compound which has the effect
- “inhibition” includes not only inhibiting the function of GSK3 ⁇ as an enzyme but also decreasing the expression level of GSK3 ⁇ in the cell, but preferably inhibiting the function of GSK3 ⁇ as an enzyme. Means.
- GSK3 ⁇ inhibitors include 1-AzaKenpaullone, Kenpaullone, CHIR99021, BIO, CID 5706819, 9-Cyanopaullone, ML320, AR A014418, SB216763, SB415286, A 1070722, Lithium chloride, Staurosporine, GSK-3 ⁇ Inhibitor VI , GSK-3 ⁇ Inhibitor X, GSK-3 ⁇ Inhibitor XV, Aloisine A, MeBIO, Alsterpaullone, 5-Iodo-Indirubin-3'-monoxime, 10Z-Hymenialdisine, TWS 119 ditrifluoroacetate, Indirubin-5-sulfonic acid sodium salt, Ro- 31-8220, Manzamine A, IM-12, CESI, 3F8, TC-G 24, TCS 2002, L803 and the like.
- GSK3 ⁇ inhibitors that are nM or less, preferably 50 nM or less, more preferably 30 nM or less, even more preferably 25 nM or less, and even more preferably 5 to 25 nM.
- an IC50 for an enzyme other than GSK3 ⁇ is 5 nM or more, preferably 10 nM or more, more preferably 25 nM or more
- the GSK3 ⁇ -specific inhibitor is preferably 50 nM or more, more preferably 100 nM or more, and even more preferably 1 ⁇ M or more.
- the IC50 for each enzyme is publicly known information.
- GSK3 ⁇ inhibitor commercially available websites (http://www.selleckchem.com/GSK-3.html, http://www.scbt.com/ chemicals-table-gsk-3_beta_inhibitors.html etc.)
- 1-AzaKenpaullone, Kenpaullone, CHIR99021, BIO, etc. preferably 1-AzaKenpaullone, Kenpaullone, CHIR99021, etc., more preferably 1-AzaKenpaullone, Kenpaullone, etc., more preferably 1-AzaKenpaullone, etc.
- These may be commercially available or may be synthesized according to known information.
- the component (A) may be used alone or in combination of two or more.
- the DYRK inhibitor is not particularly limited as long as it is a compound having an action of inhibiting DYRK (dual-specificity tyrosine-phosphorylation-regulated kinase) or a compound known to be used for the purpose of inhibiting DYRK.
- “inhibition” includes not only inhibiting the function of DYRK as an enzyme but also decreasing the expression level of DYRK in cells, but preferably inhibiting the function of DYRK as an enzyme.
- DYRK includes multiple enzymes, for example, five enzymes with similar kinase domains DYRK1A, DYRK1B, DYRK2, DYRK3, and DYRK4 in humans.
- the DYRK inhibitor is preferably an inhibitor of DYRK1A and / or DYRK1B, more preferably a specific inhibitor of DYRK1A and / or DYRK1B.
- DYRK inhibitors include ID-8, Harmine, Indirubin analog, TG003, INDY, L41, PROINDY, SB 216763, Chronogen quinolinus, Leucettine, Cyclacell limited pyrimidines, Quinazoline, Compound 35, 7BIO, 6BI0, Indirubin Az191, ML315, ML320-Compound 35, 36d, SEL141, and the like.
- ID-8, Harmine, Indirubine analog, INDY, etc. more preferably ID, more preferably from the viewpoint of being able to maintain an undifferentiated state more stably or more efficiently proliferating cells.
- ID-8, Harmine and the like more preferably ID-8 and the like.
- the component (B) may be used alone or in combination of two or more.
- the undifferentiated state of pluripotent stem cells can be maintained over a long period of time by using a combination of component (A) and component (B) without using serum or differentiation-suppressing proteins. Can do.
- component (A) component and component (B) component exhibits a differentiation inhibitory effect. Therefore, the combination of the component (A) and the component (B) can be used as a differentiation inhibitor for pluripotent stem cells.
- the medium of the present invention contains a combination of component (A) and component (B).
- the concentration of the component (A) in the medium varies depending on the type of the component (A), but is, for example, 10 to 3000 nM, preferably 50 to 2000 nM, more preferably 200 to 1500 nM, and further preferably 350 to 1000 nM. More preferably, it can be 450 to 850 nM. More specifically, for example, the following ranges are exemplified as the concentration of 1-AzaKenpaullone, Kenpaullone, or CHIR99021 in the medium.
- 1-AzaKenpaullone for example 10 to 3000 nM, preferably 100 to 2500 nM, more preferably 250 to 2000 nM, even more preferably 400 to 1500 nM, even more preferably 500 to 1000 nM; Kenpaullone: for example 10 to 3000 nM, preferably 50 to 2000 nM, more preferably 100 to 1500 nM, even more preferably 200 to 1000 nM, even more preferably 250 to 750 nM; CHIR99021: For example, 10 to 3000 nM, preferably 50 to 2000 nM, more preferably 100 to 1500 nM, still more preferably 200 to 1000 nM, still more preferably 250 to 750 nM.
- the concentration of the component (B) in the medium varies depending on the type of the component (B), but can be, for example, 10 to 4000 nM, preferably 200 to 3000 nM. More specifically, for example, the following ranges are exemplified as concentrations of ID-8, Harmine, and Indirubin analogs in the medium.
- ID-8 for example, 10 to 3000 nM, preferably 50 to 2000 nM, more preferably 100 to 1500 nM, still more preferably 200 to 1000 nM, still more preferably 250 to 750 nM; Harmine: for example 300 to 6000 nM, preferably 600 to 5000 nM, more preferably 1000 to 3000 nM, still more preferably 1500 to 2500 nM; Indirubin analogues: for example 10-3000 nM, preferably 50-2000 nM, more preferably 100-1500 nM, even more preferably 200-1000 nM, even more preferably 250-750 nM.
- the medium of the present invention is usually prepared by mixing a basic medium with the component (A) and the component (B).
- the basic medium is not particularly limited as long as it can be used as a basic medium used for culturing pluripotent stem cells, and is usually a standard inorganic salt such as magnesium, calcium, potassium, zinc, iron, buffer, glucose, Contains vitamins and essential amino acids.
- a standard inorganic salt such as magnesium, calcium, potassium, zinc, iron, buffer, glucose, Contains vitamins and essential amino acids.
- DMEM / F12 is preferable.
- Non-essential amino acids include, for example, L-glutamine, L-alanine, L-asparagine, L-aspartic acid, L-glutamic acid, glycine, L-proline, L-serine, and preferably L-glutamine.
- antioxidants include ascorbic acid, 2-mercaptoethanol, dithiothreitol and the like, preferably ascorbic acid and the like.
- the medium of the present invention further contains (C) an NFAT inhibitor (hereinafter sometimes abbreviated as “component (C)”). It is preferable.
- the NFAT inhibitor is not particularly limited as long as it is a compound having an action of inhibiting NFAT (Nuclear factor of activated T-cells) or calcineurin, or a compound known to be used for the purpose of inhibiting NFAT or calcineurin.
- “inhibition” includes not only inhibiting the function of NFAT or calcineurin as an enzyme, but also reducing the expression level of NFAT or calcineurin in cells, but preferably as an enzyme of NFAT or calcineurin. It means inhibiting the function of.
- NFAT inhibitors include Tacrolimus (FK506), Cyclosporin A, AM404, UR-1505, CN585, Sirolimus (Rapamycin), Endothall, FMPP, Tyrphostins, VIVIT 480402, INCA (1, 2, 6), Lie120 Roc-1, NCI3, Thiopental, ST1959 (DL111-IT), Quercetin, Tropisetron, Trifluoperazine, PD144795, Norcantharidin, Ascomycin (FKBP12) and the like.
- Tacrolimus and the like can be preferably mentioned from the viewpoint that the undifferentiated state can be more stably maintained or the cells can be more efficiently proliferated.
- These may be commercially available or may be synthesized according to known information.
- the component (C) may be used alone or in combination of two or more.
- the concentration of the component (C) in the medium varies depending on the type of the component (C), but is, for example, 10 to 3000 ⁇ M, preferably 50 to 2000 ⁇ M, more preferably 100 to 1500 ⁇ M, and more preferably 200 to 1000 ⁇ M. More preferably, it can be 250 to 750 pM.
- the culture medium of the present invention may contain a differentiation-suppressing protein, serum, or serum substitute component as necessary.
- the differentiation inhibitor protein is not particularly limited as long as it is a factor having an action of maintaining the undifferentiated state of pluripotent stem cells or a factor known to be used for the purpose of maintaining the undifferentiated state of pluripotent stem cells.
- Examples include bFGF, TGF ⁇ superfamily (activin, Nodal, etc.), LIF, Wnt and the like.
- concentration of the differentiation inhibiting protein a known concentration employed in the culture of pluripotent stem cells can be employed. Differentiation-inhibiting proteins may be used alone or in combination of two or more.
- the differentiation-inhibiting proteins are very expensive and have a large variation in performance between lots compared to compounds.
- the medium of the present invention contains a combination of the component (A) and the component (B), the pluripotent stem cells can be efficiently differentiated without using these differentiation-suppressing proteins. Can be maintained. Therefore, from the viewpoint that the medium preparation cost can be further reduced, or that the variation in performance among the lots of the medium can be further reduced, the culture medium of the present invention preferably does not contain the differentiation inhibiting protein or is added with the differentiation inhibiting protein. Without culturing.
- Serum is not particularly limited as long as it can be used for culturing pluripotent stem cells.
- An example is fetal bovine serum (FBS).
- FBS fetal bovine serum
- As the serum concentration a known concentration employed in the culture of pluripotent stem cells can be employed.
- One type of serum may be used alone, or two or more types of combinations may be used.
- the medium of the present invention can efficiently maintain the undifferentiated state of pluripotent stem cells and further proliferate cells without using serum. Therefore, from the viewpoint that the medium preparation cost can be further reduced or that the variation in performance among the lots of the medium can be further reduced, the culture medium of the present invention preferably does not contain serum or is cultured without adding serum. Used for.
- Serum replacement component means a component that can support proliferation of pluripotent stem cells by adding it to a serum-free medium.
- albumin eg, bovine serum albumin
- albumin substitute additive eg, bovine pituitary extract, rice hydrolyzate, fetal bovine albumin, egg albumin, human serum albumin, bovine embryo extract, AlbuMAXbuI (Registered trademark)
- transferrin insulin and the like.
- concentration of the serum replacement component a known concentration employed in the culture of pluripotent stem cells can be employed. Serum replacement components may be used alone or in combination of two or more.
- the medium of the present invention can efficiently maintain the undifferentiated state of pluripotent stem cells and proliferate cells even if the serum replacement component (or protein component) is only insulin and transferrin. it can. Therefore, from the viewpoint that the variation in performance between lots of the medium can be further reduced, the serum substitute component (or protein component) contained in the medium of the present invention (or added during culture) is preferably only insulin and transferrin. It is.
- the medium of the present invention may contain known components that can be added to the medium for pluripotent stem cells.
- these components selenium, ethanolamine and the like, preferably selenium, and the like are mentioned from the viewpoint that the cells can be more efficiently grown.
- concentrations of these components known concentrations employed in the culture of pluripotent stem cells can be employed.
- the medium of the present invention can be prepared in a solution form or a dry form, respectively.
- a solution form it may be provided as a concentrated composition (for example, 1 ⁇ to 1000 ⁇ ) and may be appropriately diluted upon use.
- the type of liquid used to dilute or dissolve the composition or medium in solution form or dry form includes water, aqueous buffer solution, physiological saline solution and the like, and can be easily selected as necessary.
- the pH is usually adjusted to 7.0 to 8.2, preferably 7.1 to 7.8, more preferably 7.2 to 7.5 with a pH adjusting agent such as bicarbonate. It is adjusted to 310-340mOsm with salts such as sodium.
- the medium of the present invention is preferably sterilized to prevent contamination.
- Sterilization methods include ultraviolet irradiation, heat sterilization, radiation irradiation, filtration, and the like.
- the medium of the present invention can be used as it is or after adding the above-described components as necessary to culture pluripotent stem cells (for example, maintenance of pluripotent stem cells, passage of pluripotent stem cells, induced pluripotent stem cells (iPS cells) and the like.
- pluripotent stem cells for example, maintenance of pluripotent stem cells, passage of pluripotent stem cells, induced pluripotent stem cells (iPS cells) and the like.
- the pluripotent stem cell to be cultured is not particularly limited as long as it has the ability to differentiate into any of the three germ layers (endoderm, mesoderm, and ectoderm).
- the organism of origin is not particularly limited. For example, humans, monkeys, mice, rats, hamsters, rabbits, guinea pigs, cattle, pigs, dogs, horses, cats, goats, sheep, and other mammals, birds, reptiles and other various animals. Derived ones can be used. Of these, those derived from mammals, more preferably those derived from primates, more preferably those derived from humans, monkeys, etc., and still more preferably those derived from humans.
- Specific examples of pluripotent stem cells include iPS cells, ES cells, EG cells, EC cells and the like. As pluripotent stem cells, various commercially available or distributed ones may be used, or those prepared according to a known method may be used.
- pluripotent stem cells When pluripotent stem cells are cultured using the medium of the present invention, they can be cultured according to a conventional method.
- the typical subculture operations and culture conditions are as follows. First, the grown colonies of pluripotent stem cells are rinsed once or twice with PBS, and then a sufficient amount of cell detachment solution is added so as to cover the cell layer and left for several minutes. Add basal medium containing PBS or serum and separate the cell mass by pipetting. From this cell suspension, cells are usually precipitated by centrifugation. After removing the supernatant, the precipitated cells are resuspended in a medium, and a part thereof is seeded on a dish or a coated dish in which feeder cells are spread and cultured at 37 ° C. under 5% CO 2 .
- colonies of induced pluripotent stem cells can be obtained much more efficiently than when a conventional culture medium for pluripotent stem cells is used.
- “used to produce induced pluripotent stem cells” means that a reprogramming factor is introduced into a somatic cell and then used as a culture medium for the cell.
- a solution containing EDTA for example, a solution containing EDTA, a solution containing dispase as an enzyme, or the like can be used. From the viewpoint of higher survival rate of pluripotent stem cells, a solution containing EDTA is preferable. In addition, from the viewpoint that passage can be simplified, a solution containing dispase as an enzyme is preferable.
- the concentration of EDTA and dispase in the cell detachment solution can be determined according to a known concentration employed in cell culture.
- Examples of the coating component of the coding dish include vitronectin and laminin. Among these, Preferably, vitronectin can be mentioned.
- the medium of the present invention is excellent in that it can maintain the undifferentiated state of pluripotent stem cells, whether it is adhesion culture or suspension culture.
- adhesion culture an undifferentiated state can be maintained as stably as in the presence of feeder cells even in the absence of feeder cells. Therefore, culture in the absence of feeder cells is preferable from the viewpoint of easier culturing.
- Example 1 Subculture of pluripotent stem cells using medium containing GSK3 ⁇ inhibitor and DYRK inhibitor ⁇ Preparation of basic medium> Powder DMEM / F-12 medium (D0547 from Sigama-Aldrich) diluted twice with water 25 mL, 6% sodium bicarbonate solution 1.4 mL, 1M HEPES solution 0.75 mL, 0.23M ascorbic acid solution 0.045 mL, ITS (Insulin-Transferrin-Selenium: 1 mg / ml-0.55 mg / ml-0.7 ⁇ g / ml) Solution (ITS-G 41400-045 manufactured by Life Technologies) 0.9 mL and 16.905 mL of water are mixed, and 45 mL of basic medium (340 mOsm, pH 7.2-7.5) was obtained.
- Powder DMEM / F-12 medium D0547 from Sigama-Aldrich
- ITS Insulin-Transferrin-Selenium: 1 mg
- GSK3 ⁇ inhibitor (1-AzaKenpaullone (Sigma-Aldrich A3734), Kenpaullone (Bio Vision 1094-1), CHIR99021 (Axon Medchem 1386), or BIO (Sigam-Aldrich B1686)
- ID-8 I1786 from Sigma-Aldrich
- Harmine 10010324 from Cayman Chemical
- Indirubin analog 716 (6i) (American Chemical Society, Lett, 2014, 4, 22-26)
- INDY Merck Millipore 405273
- L41 AdipoGen MR-C0023
- TG003 R & D Systems 4336
- the final concentrations in the medium are 750 nM for 1-AzaKenpaullone, 500 nM for Kenpaullone, 500 nM for CHIR99021, 1 ⁇ M for Bio, 500 nM for ID-8, 2 ⁇ M for Harmine Indirubin analog 716 was 500 nM, INDY was 1 ⁇ M, L41 was 500 nM, and TG003 was 500 nM.
- the obtained medium (hereinafter sometimes simply referred to as “medium”) was used in this example and the following examples.
- ⁇ Subculture of pluripotent stem cells Human ES cell line KhES-1 (provided by RIKEN BioResource Center) was subcultured in the above medium. Specifically, it was performed as follows. The following culture was performed on a dish (Vitronectin-N coated dish) that had been coated overnight with 1 ⁇ g of Vitoronectin-N (Life Technologies A14700) per 1 cm 2 of the culture dish in the absence of feeder cells. went.
- General human ES cell culture medium (20% knockout Serum Replacement (Life Technology 10828-028), 4ng / ml FGF2 (Peprotech 100-18B) / DMEM / F-12 medium (Life Technology 11330-
- Dispace solution (10 mg / ml Dispase (Life Technologies 17105041) / DMEM / F-12) was added so as to cover the cells and left for 5 minutes.
- the above general medium for human ES cells was added, and the cell mass was separated by pipetting. The obtained cell suspension was centrifuged (500 cfg, 1 minute) to precipitate the cells.
- the precipitated cells were resuspended in the above medium, and about 1/3 of this was seeded on a Vitrononectin-N coated dish, and cultured in the above medium at 37 ° C. under 5% CO 2 .
- This passage operation was designated as “P1”.
- the medium was changed every 1 or 2 days, and subcultured (P2, P3, P4,%) As described above every 3 or 4 days.
- Fig. 1 shows a cell image (top row) when subcultured using a medium containing a DYRK inhibitor (ID-8), and a GSK3 ⁇ inhibitor (1-AzaKenpaullone, Kenpaullone, CHIR99021, or Bio) and a DYRK inhibitor Cell images (2nd to bottom) from subculture using a medium containing (ID-8), and subculture using a medium containing GSK3 ⁇ inhibitor (1-AzaKenpaullone) in Fig. 2.
- ID-8 DYRK inhibitor
- GSK3 ⁇ inhibitor 1-AzaKenpaullone, Kenpaullone, CHIR99021, or Bio
- ES cells can be maintained in an undifferentiated state by using a combination of a GSK3 ⁇ inhibitor and a DYRK inhibitor.
- GSK3 ⁇ inhibitors Kenpaullone and 1-AzaKenpaullone (especially 1-AzaKenpaullone) were able to maintain ES cells most stably.
- ID-8 was the most stable in maintaining ES cells.
- Example 2 Role of NFAT inhibitor in subculture of pluripotent stem cells
- GSK3 ⁇ inhibitor (1-AzaKenpaullone or Kenpaullone) and DYRK inhibitor (ID-8)
- NFAT inhibitor Tacrolimus (FK- 506) (Cayman Chemical Co., Ltd. 1007965)
- FK- 506 Ciscomycin C
- FIG. 3A shows that ES cells can be maintained in an undifferentiated state even when an NFAT inhibitor (Tacrolimus) is added in addition to a GSK3 ⁇ inhibitor (AzaKenpaullone) and a DYRK inhibitor (ID-8).
- FIG. 3B also shows that cell proliferation is significantly promoted by adding an NFAT inhibitor (Tacrolimus) in addition to the GSK3 ⁇ inhibitor (AzaKenpaullone) and DYRK inhibitor (ID-8). It was also shown that 1-AzaKenpaullone can promote cell proliferation more than Kenpaullone.
- Example 3 Long-term culture of ES cells Human ES cell line KhES-1, human ES cell line H9 (W09 provided by WiCell), human iPS cell line 253G1 (HPS0002 provided by RIKEN BioResource Center), human iPS cell line 201B7 (RIKEN) HPS0063 provided by BioResource Center), human ES cell line H1 (provided by WiCell W01), medium containing GSK3 ⁇ inhibitor (1-AzaKenpaullone) and DYRK inhibitor (ID-8) (medium 1), and GSK3 ⁇ inhibitor (1 -AzaKenpaullone) and a DYRK inhibitor (ID-8) and a medium (medium 2) further containing an NFAT inhibitor (Tacrolimus) were prepared in the same manner as in Example 1, and these were used as in Example 1. Subculture and cell observation were performed.
- FIG. 4A shows a cell image when medium 1 is used
- FIG. 4B shows a cell image when medium 2 is used.
- the human ES cell line H1 is derived from males, but the culture media 1 and 2 are cells derived from other females (human ES cells) even if they are cells derived from such males. Similar to the cell line KhES-1, human ES cell line H9, human iPS cell line 253G1, and human iPS cell line 201B7), the undifferentiated state could be maintained over a long period of time.
- Example 4 Confirmation of undifferentiated state after long-term culture Expression of an undifferentiated marker in cells after long-term culture in Example 3 was examined. Specifically, it was performed as follows.
- Human ES cell line KhES-1 maintained until passage P50 using a medium (Example 3) containing a GSK3 ⁇ inhibitor (1-AzaKenpaullone), a DYRK inhibitor (ID-8), and an NFAT inhibitor (Tacrolimus) (Example 3), human iPS cell line 201B7 maintained until passage P20 (Example 3), human ES cell line H9 maintained until passage P30 (Example 3), and human iPS cells maintained until passage P20 Expression of undifferentiated markers (OCT4, SOX2, NANOG, alkaline phosphatase (ALP), SSEA-3, SSEA-4, TRA1-81, TRA1-60) in the strain 253G1 (Example 3) was performed according to a conventional method.
- Detection was performed by immunostaining (primary antibodies used were OCT4 (Scanta Cruz Biotechnology, Sc-5279, diluted 200-fold), SOX2 (Santa Cruz Biotechnology, Sc-17320, diluted 100-fold), NANOG (Cell Signaling Technology 4903, 100-fold dilution), SSEA-3 (Santa Cruz Biotechnology, Sc-21703, 50-fold dilution), SSEA-4 (Santa Cruz Biotechnology, Sc-59368, 50-fold dilution), TRA-1-81 (Santa Cruz Biotechnology Sc-21705, diluted 50-fold), TRA-1-60 (Santa Cruz Biotechnology Sc-21706, diluted 50-fold), alkaline phosphatase (ALP) (VECTOR Blue Alkaline Phosphatase Substrate Kit, VECTOR Laboratories SK-5300), secondary antibodies are AlexaFluor 488 or 594 antibodies from Life Technologies corresponding to each primary antibody, diluted 400 times).
- primary antibodies used were OCT4
- the karyotype in (Example 3), human ES cell line H9 (Example 3) maintained until passage P33, and human iPS cell line 253G1 (Example 3) maintained until passage P25 was determined according to the standard method. Analysis was performed by the band method.
- FIG. 5A shows the result of immunostaining
- FIG. 5B shows the result of flow cytometry
- FIG. 5C shows the result of karyotype analysis.
- the left peak in the two-dimensional plot of FIG. 5B shows the negative control peak without the primary antibody, and the right peak shows the peak when the primary antibody is used.
- Example 5 Comparison with an existing medium A medium containing a GSK3 ⁇ inhibitor (1-AzaKenpaullone), a DYRK inhibitor (ID-8), and an NFAT inhibitor (Tacrolimus) (Example 3), and an existing medium, The proliferation rate of pluripotent stem cells and the expression level of undifferentiated markers were compared. Specifically, it was performed as follows.
- nt3A and ID-8-containing medium As existing pluripotent stem cell culture media, mTeSR1 medium (Stem Cell Technology 05850), E8 medium (Stem Cell Technology 05940), and Wnt3A and ID-8-containing medium were prepared.
- Wnt3A and ID-8-containing medium Wnt3A (Peprotech 315-20) was added to the basic medium prepared in Example 1 to a final concentration of 10 ng / mL, and ID-8 was further added to a final concentration of 500. It was added to make nM.
- FIG. 6A shows the measurement result of the proliferation rate
- FIG. 6B shows the detection result of the undifferentiated marker by flow cytometry
- FIG. 6C shows the detection result of the undifferentiated marker by quantitative PCR.
- a medium containing a GSK3 ⁇ inhibitor (1-AzaKenpaullone), a DYRK inhibitor (ID-8), and an NFAT inhibitor (Tacrolimus) grows at the same speed as or faster than an existing medium. It was shown that. From FIGS. 6B and 6C, the medium containing GSK3 ⁇ inhibitor (1-AzaKenpaullone), DYRK inhibitor (ID-8), and NFAT inhibitor (Tacrolimus) is more similar to the existing medium on feeder cells. It was shown that the undifferentiated state can be stably maintained as in the case of culturing with the above.
- Example 6 Examination of conditions for subculture ⁇ Experimental experiment on coating components of dish> On Vitronectin-N coated dish, on dish (Synthemax coated dish) coated overnight with 5 ⁇ g Synthemax (Corning Synthemax (registered trademark) II-SC Substrate A14700) per 1 cm 2 of culture dish or on culture dish On a dish (Laminin511 E8 coated dish) coated overnight with 1 ⁇ g of Laminin511 E8 (Nippi iMatrix-511 892001) per cm 2 , the human ES cell line KhES-1 or human as in Example 1 The ES cell line H9 was subcultured.
- Synthemax Corning Synthemax (registered trademark) II-SC Substrate A14700
- FIG. 7A shows a cell image after the examination experiment of the coating component
- FIG. 7B shows a cell image after the examination experiment of the cell peeling solution.
- FIG. 7A shows that ES cells can be maintained in an undifferentiated state even when Synthemax or Laminin511 E8 is used as a coating component. Among them, Vitronectin-N was able to maintain ES cells most stably.
- FIG. 7B shows that ES cells can be maintained in an undifferentiated state using either an EDTA solution or a Dispase solution as a cell detachment solution.
- EDTA solution was used, the survival rate of ES cells was high, but it was slightly difficult to pass, but when using Dispase solution, the passage was easy but the cell viability tended to be low. .
- Example 7 Application to suspension culture GSK3 ⁇ inhibitor (1-AzaKenpaullone), DYRK inhibitor (ID-8), and medium containing NFAT inhibitor (Tacrolimus) (Example 3), mTeSR1 medium, or E8 medium
- GSK3 ⁇ inhibitor (1-AzaKenpaullone
- ID-8 DYRK inhibitor
- Tacrolimus medium containing NFAT inhibitor
- mTeSR1 medium mTeSR1 medium
- E8 medium The human ES cell line KhES-1 was cultured in suspension according to a conventional method. The cell image after P3 passage is shown in FIG. 8A.
- FIG. 8A shows that the medium containing GSK3 ⁇ inhibitor (1-AzaKenpaullone), DYRK inhibitor (ID-8), and NFAT inhibitor (Tacrolimus) undifferentiated ES cells by suspension culture as well as the existing medium. It was shown that it can be maintained in a stable state.
- the growth rate in the case of suspension culture in a medium containing a GSK3 ⁇ inhibitor (1-AzaKenpaullone), a DYRK inhibitor (ID-8), and an NFAT inhibitor (Tacrolimus) is obtained when an existing medium is used. It was shown to be comparable to the growth rate.
- FIG. 8C shows the expression level of each undifferentiated marker as a relative value with respect to the expression level when mTeSR1 medium is used.
- Example 8 Production of iPS cells iPS cells using a medium containing GSK3 ⁇ inhibitor (1-AzaKenpaullone), DYRK inhibitor (ID-8), and NFAT inhibitor (Tacrolimus) (Example 3), or E8 medium
- GSK3 ⁇ inhibitor (1-AzaKenpaullone
- ID-8 DYRK inhibitor
- NFAT inhibitor Tacrolimus
- E8 medium Were prepared and analyzed for production efficiency, colony morphology, and expression of undifferentiated markers. Specifically, it was performed as follows.
- iPS cells were prepared. The scheme is shown in FIG. 9A.
- Human fetal fibroblasts were transfected according to standard methods.
- ALP alkaline phosphatase
- FIG. 9B shows the ALP-stained image
- FIG. 9C shows the iPS cell production efficiency
- FIG. 9D shows the observation result of the colony morphology
- FIG. 9E shows the result of immunostaining.
- # 1 and # 2 show the results of separate wells, respectively.
- 9B and C show that iPS cells can be produced by using the medium of the present invention much more efficiently (about 40 times) than the existing medium.
- 9D and E confirmed that iPS cells prepared using the medium of the present invention were normal in morphology and also expressed undifferentiated markers.
Abstract
Description
項1. (A)GSK3β阻害剤、及び(B)DYRK阻害剤を含有する多能性幹細胞培養用培地。
項2. 血清を含まない、項1に記載の培地。
項3. 分化抑制タンパク質を含まない、項1又は2に記載の培地。
項4. 含有されるタンパク質成分がインスリン及びトランスフェリンのみである、項1~3のいずれかに記載の培地。
項5. (A)成分が1-AzaKenpaullone、Kenpaullone、及びCHIR99021からなる群より選択される少なくとも1種である、項1~4のいずれかに記載の培地。
項6. (A)成分が1-AzaKenpaulloneである、項1~5のいずれかに記載の培地。
項7. (B)成分がID-8、Harmine、及びIndirubin類似体からなる群より選択される少なくとも1種である、項1~6のいずれかに記載の培地。
項8. (B)成分がID-8である、項1~7のいずれかに記載の培地。
項9. 更に、(C)NFAT阻害剤を含有する、項1~8のいずれかに記載の培地。
項10. (C)成分がTacrolimusである、項9に記載の培地。
項11. フィーダー細胞非存在下での培養用である、項1~10のいずれかに記載の培地。
項12. 多能性幹細胞が霊長類由来細胞である、項1~11のいずれかに記載の培地。
項13. 項1~12のいずれかに記載の培地を用いる、多能性幹細胞の培養方法。
項14. (A)GSK3β阻害剤、及び(B)DYRK阻害剤を含有する、多能性幹細胞の分化抑制剤。
GSK3β阻害剤は、GSK3β(グリコーゲン合成酵素キナーゼ3β)を阻害する作用を有する化合物、又はGSK3βを阻害する目的で用いられることが公知の化合物であれば特に限定されない。ここで、「阻害」は、GSK3βの酵素としての機能を阻害することのみならず、細胞内のGSK3βの発現量を減少させることも包含するが、好ましくはGSK3βの酵素としての機能を阻害することを意味する。GSK3β阻害剤として、具体的には、例えば1-AzaKenpaullone、Kenpaullone、CHIR99021、BIO、CID 5706819、9-Cyanopaullone、ML320、AR A014418、SB216763、SB415286、A 1070722、Lithium chloride、Staurosporine、GSK-3β Inhibitor VI、GSK-3β Inhibitor X、GSK-3β Inhibitor XV、Aloisine A、MeBIO、Alsterpaullone、5-Iodo-Indirubin-3'-monoxime、10Z-Hymenialdisine、TWS 119 ditrifluoroacetate、Indirubin-5-sulfonic acid sodium salt、Ro-31-8220、Manzamine A、IM-12、CESI、3F8、TC-G 24、TCS 2002、L803等を挙げることができる。
本発明の培地は、(A)成分と(B)成分とを組み合わせて含有する。
1-AzaKenpaullone:例えば10~3000 nM、好ましくは100~2500 nM、より好ましくは250~2000 nM、さらに好ましくは400~1500 nM、よりさらに好ましくは500~1000 nM;
Kenpaullone:例えば10~3000 nM、好ましくは50~2000 nM、より好ましくは100~1500 nM、さらに好ましくは200~1000 nM、よりさらに好ましくは250~750 nM;
CHIR99021:例えば10~3000 nM、好ましくは50~2000 nM、より好ましくは100~1500 nM、さらに好ましくは200~1000 nM、よりさらに好ましくは250~750 nM。
ID-8:例えば10~3000 nM、好ましくは50~2000 nM、より好ましくは100~1500 nM、さらに好ましくは200~1000 nM、よりさらに好ましくは250~750 nM;
Harmine:例えば300~6000 nM、好ましくは600~5000 nM、より好ましくは1000~3000 nM、さらに好ましくは1500~2500 nM;
Indirubin類似体:例えば10~3000 nM、好ましくは50~2000 nM、より好ましくは100~1500 nM、さらに好ましくは200~1000 nM、よりさらに好ましくは250~750 nM。
<基本培地の調製>
粉末DMEM/F-12培地(Sigama-Aldrich社製D0547)を水で2倍希釈した溶液 25 mL、6%炭酸水素ナトリウム溶液 1.4 mL、1M HEPES溶液 0.75 mL、0.23M アスコルビン酸溶液 0.045 mL、ITS(Insulin-Transferrin-Selenium: 1 mg/ml-0.55 mg/ml-0.7 μg/ml)溶液(Life Technologies社製ITS-G 41400-045) 0.9 mL、水 16.905 mLを混合し、45 mLの基本培地(340mOsm, pH 7.2-7.5)を得た。
基本培地に、GSK3β阻害剤(1-AzaKenpaullone(Sigma-Aldrich社製A3734)、Kenpaullone(Bio Vision社製1094-1)、CHIR99021(Axon Medchem社製1386)、又はBIO(Sigam-Aldrich社製B1686))、及びDYRK阻害剤(ID-8(Sigma-Aldrich社製I1786)、Harmine(Cayman Chemical社製10010324)、Indirubin類似体716 (6i)(American Chemical Society, Lett, 2014, 4, 22-26)、INDY(Merck Millipore社製405273)、L41(AdipoGen社製 MR-C0023)、又はTG003(R&D Systems社製4336))を、単独或いは組み合わせて添加し、培地を得た。培地中の最終濃度は、1-AzaKenpaulloneが750 nMであり、Kenpaulloneが500 nMであり、CHIR99021が500 nMであり、Bioが1μMであり、ID-8が500 nMであり、Harmineが2μMであり、Indirubin類似体716が500 nMであり、INDYが1μMであり、L41が500 nMであり、TG003が500 nMであった。得られた培地(以下、単に「培地」と表記することもある)を、本実施例、及び以下の実施例で用いた。
ヒトES細胞株KhES-1(理研バイオリソースセンター提供)を上記培地で継代培養した。具体的には次のように行った。なお、以下の培養は、培養ディッシュ1 cm2当たり1μgのVitronectin-N(Life Technologies社製A14700)で一晩コーティング処理を行ったディッシュ(Vitronectin-Nコートディッシュ)上で、フィーダー細胞非存在下で行った。
図1にDYRK阻害剤(ID-8)を含む培地を用いて継代培養した場合の細胞像(最上段)、及びGSK3β阻害剤(1-AzaKenpaullone、Kenpaullone、CHIR99021、又はBio)及びDYRK阻害剤(ID-8)を含む培地を用いて継代培養した場合の細胞像(上から2段目から最下段)を、図2にGSK3β阻害剤(1-AzaKenpaullone)を含む培地を用いて継代培養した場合の細胞像(最上段)、及びGSK3β阻害剤(1-AzaKenpaullone)及びDYRK阻害剤(ID-8、Harmine、Indirubin類似体716、INDY、L41、又はTG003)を含む培地を用いて継代培養した場合の細胞像(上から2段目から最下段)を示す。各図中、P1は、P1の継代から3日後の細胞像を示す。P2、P3等も同様である。
GSK3β阻害剤(1-AzaKenpaullone又はKenpaullone)及びDYRK阻害剤(ID-8)に加えて、更にNFAT阻害剤(Tacrolimus(FK-506)(Cayman Chemical社製1007965))を加えた培地を実施例1と同様に調製し、これを用いて、実施例1と同様に継代培養及び細胞の観察を行った。また、これとは別に、この培地を用いて実施例1と同様にP1継代を行った後、継代せずに6日間培養した後の細胞数を定法に従って計測し、この計測細胞数に基づいて6日間の間に細胞が何倍に増加したのかを算出した。
細胞像を図3Aに、細胞の倍化数(Fold increase)を図3Bに示す。
ヒトES細胞株KhES-1、ヒトES細胞株H9(WiCell社提供W09)、ヒトiPS細胞株253G1(理研バイオリソースセンター提供HPS0002)、ヒトiPS細胞株201B7(理研バイオリソースセンター提供HPS0063)、及びヒトES細胞株H1(WiCell提供W01)を、GSK3β阻害剤(1-AzaKenpaullone)及びDYRK阻害剤(ID-8)を含む培地(培地1)、並びにGSK3β阻害剤(1-AzaKenpaullone)及びDYRK阻害剤(ID-8)に加えて、更にNFAT阻害剤(Tacrolimus)を含む培地(培地2)を実施例1と同様に調製し、これらを用いて、実施例1と同様に継代培養及び細胞の観察を行った。
培地1を用いた場合の細胞像を図4Aに、培地2を用いた場合の細胞像を図4Bに示す。
実施例3の長期間培養後の細胞における、未分化マーカーの発現を調べた。具体的には次のように行った。
GSK3β阻害剤(1-AzaKenpaullone)、DYRK阻害剤(ID-8)、及びNFAT阻害剤(Tacrolimus)を含む培地(実施例3)を用いて、P50継代まで維持したヒトES細胞株KhES-1(実施例3)、P20継代まで維持したヒトiPS細胞株201B7(実施例3)、P30継代まで維持したヒトES細胞株H9(実施例3)、及びP20継代まで維持したヒトiPS細胞株253G1(実施例3)における、未分化マーカー(OCT4、SOX2、NANOG、アルカリフェスファターゼ(ALP)、SSEA-3、SSEA-4、TRA1-81、TRA1-60)の発現を、定法に従った免疫染色によって検出した(使用した1次抗体は、OCT4 (Santa Cruz Biotechnology社製Sc-5279、200倍希釈)、SOX2(Santa Cruz Biotechnology社製Sc-17320、100倍希釈)、NANOG(Cell Signaling Technology社製4903、100倍希釈)、SSEA-3(Santa Cruz Biotechnology社製Sc-21703、50倍希釈)、SSEA-4(Santa Cruz Biotechnology社製Sc-59368、50倍希釈)、TRA-1-81(Santa Cruz Biotechnology社製Sc-21705、50倍希釈)、TRA-1-60(Santa Cruz Biotechnology社製Sc-21706、50倍希釈)、アルカリフェスファターゼ(ALP)(VECTOR Blue Alkaline Phosphatase Substrate Kit, VECTOR Laboratories社製SK-5300)、二次抗体は、各一次抗体に対応したLife Technologies社製AlexaFluor 488もしくは594抗体、400倍希釈)。
GSK3β阻害剤(1-AzaKenpaullone)、DYRK阻害剤(ID-8)、及びNFAT阻害剤(Tacrolimus)を含む培地(実施例3)を用いて、P26継代まで維持したヒトES細胞株KhES-1(実施例3)、及びP17継代まで維持したヒトES細胞株H9(実施例3)における、未分化マーカー(OCT4、SSEA-4)の発現を、定法に従ってフローサイトメトリー(Becton Dickinson社製BD FACS CANT II)によって検出した(使用一次抗体は、OCT4 (Santa Cruz Biotechnology社製Sc-5279、100倍希釈)、SSEA-4(Santa Cruz Biotechnology社製Sc-59368、100倍希釈) 二次抗体は、各一次抗体に対応したLife Technologies社製AlexaFluor 488抗体、1000倍希釈)。
GSK3β阻害剤(1-AzaKenpaullone)、DYRK阻害剤(ID-8)、及びNFAT阻害剤(Tacrolimus)を含む培地(実施例3)を用いて、P49継代まで維持したヒトES細胞株KhES-1(実施例3)、P33継代まで維持したヒトES細胞株H9(実施例3)、及びP25継代まで維持したヒトiPS細胞株253G1(実施例3)における核型を、定法に従ったGバンド法によって解析した。
免疫染色の結果を図5Aに、フローサイトメトリーの結果を図5Bに、核型解析の結果を図5Cに示す。なお、図5Bの二次元プロットおける左側のピークは1次抗体を用いないネガティブコントロールのピークを示し、右側のピークは1次抗体を用いた場合のピークを示す。
GSK3β阻害剤(1-AzaKenpaullone)、DYRK阻害剤(ID-8)、及びNFAT阻害剤(Tacrolimus)を含む培地(実施例3)と、既存の培地とで、多能性幹細胞の増殖速度、及び未分化マーカーの発現量を比較した。具体的には次のように行った。
既存の多能性幹細胞培養用培地として、mTeSR1培地(Stem Cell Technology社製05850)、E8培地(Stem Cell Technology社製05940)、並びにWnt3A及びID-8含有培地を準備した。Wnt3A及びID-8含有培地は、実施例1で作成した基本培地に、Wnt3A(Peprotech社製315-20)を終濃度10 ng/mLになるように添加し、さらにID-8を終濃度500 nMになるように添加して作成した。
各培地を用いて、実施例1と同様にヒトES細胞株KhES-1の継代培養を行った。各継代(3日毎)時に、各ウェルの底面(3.80 cm2)の約20%を細胞が占めるように細胞を播種し、この時の分割比を記録した。継代はP5継代まで行い、P1~5継代の平均分割比を算出した。
各培地を用いて、実施例1と同様にヒトES細胞株KhES-1の継代培養を行った。P30継代まで維持した細胞における、未分化マーカー(OCT4、SSEA-4)の発現を、実施例4と同様にフローサイトメトリーによって検出した。
各培地を用いて、実施例1と同様にヒトES細胞株KhES-1の継代培養を行った。P5継代まで維持した細胞における、未分化マーカー(OCT4、SSEA-4)の発現を、定法に従って定量的PCRによって検出した。これとは別に、コントロール細胞として、フィーダー細胞上で同様に培養した細胞についても、未分化マーカーを検出した。
増殖速度の測定結果を図6Aに、フローサイトメトリーによる未分化マーカーの検出結果を図6Bに、定量的PCRによる未分化マーカーの検出結果を図6Cに示す。
<ディッシュのコーティング成分の検討実験>
Vitronectin-Nコートディッシュ上、培養ディッシュ1 cm2当たり5μgのSynthemax(Corning社製Synthemax(登録商標)II-SC Substrate A14700)で一晩コーティング処理を行ったディッシュ(Synthemaxコートディッシュ)上、又は培養ディッシュ1 cm2当たり1μgのLaminin511 E8(Nippi社製iMatrix-511 892001)で一晩コーティング処理を行ったディッシュ(Laminin511 E8コートディッシュ)上で、実施例1と同様にヒトES細胞株KhES-1又はヒトES細胞株H9の継代培養を行った。
継代時に用いる細胞剥離液としてEDTA溶液(0.5 mM EDTA/PBS)又はDispase溶液(10 mg/mL Dispase/基本培地)を用いて、実施例1と同様にヒトES細胞株KhES-1又はヒトES細胞株H9の継代培養を行った。
コーティング成分の検討実験後の細胞像を図7Aに、細胞剥離液の検討実験後の細胞像を図7Bに示す。
GSK3β阻害剤(1-AzaKenpaullone)、DYRK阻害剤(ID-8)、及びNFAT阻害剤(Tacrolimus)を含む培地(実施例3)、mTeSR1培地、又はE8培地を用いて、ヒトES細胞株KhES-1を定法に従って浮遊培養した。P3継代後の細胞像を図8Aに示す。
GSK3β阻害剤(1-AzaKenpaullone)、DYRK阻害剤(ID-8)、及びNFAT阻害剤(Tacrolimus)を含む培地(実施例3)、又はE8培地を用いてiPS細胞を作製し、作製効率、コロニーの形態、未分化マーカーの発現について解析した。具体的には次のように行った。
iPS作製に関する文献(Nature Methods (2011) 8: 424-429、Nature Protocol (2012) 7: 2029-2040)に記載の方法に基づいて、ヒト胎仔線維芽細胞 (ScienCell社HDF-f、2300)からiPS細胞を作製した。そのスキームを図9Aに示す。Day 0において、リプログラミング因子(OCT4、SOX2、KLF4、c-MYC、LIN28、及びSV40LargeT)発現エピソーマルベクター(pEB-C5又はpEB-Tg(Cell Research (2011) 21:518-529))を、定法に従ってヒト胎仔線維芽細胞にトランスフェクションした。その後、Day 6-9まで、E8培地に酪酸ナトリウム(培地中の終濃度:100μM)及びヒドロコルチゾン(培地中の終濃度:100 nM)が添加された培地、又はGSK3β阻害剤(1-AzaKenpaullone)、DYRK阻害剤(ID-8)、及びNFAT阻害剤(Tacrolimus)を含む培地(実施例3)に酪酸ナトリウム(培地中の終濃度:100μM)及びヒドロコルチゾン(培地中の終濃度:100 nM)が添加された培地中で培養した。Day 6-9からは、ヒドロコルチゾンを除き、且つE8培地についてはTGFβを除いた培地を用いてDay 20-25まで培養した。培養ウェル上の細胞を、定法に従ってアルカリフェスファターゼ(ALP)染色し、ALP陽性コロニーの数を計測した。該計測数を、リプログラミング因子発現ベクターをトランスフェクションした細胞数で除した値を、iPS細胞作製効率とした。
iPS細胞作製後、コロニーをピックアップして、E8培地、又はGSK3β阻害剤(1-AzaKenpaullone)、DYRK阻害剤(ID-8)、及びNFAT阻害剤(Tacrolimus)を含む培地(実施例3)を用いて、定法に従って60日間培養した。培養後、細胞像を観察した。また、未分化マーカー(OCT4、SOX2、NANOG、ALP、SSEA-3、SSEA-4、TRA1-81、TRA1-60)の発現を、免疫染色で実施例4と同様の方法で検出した。
ALP染色像を図9Bに、iPS細胞作製効率を図9Cに、コロニーの形態の観察結果を図9Dに、免疫染色の結果を図9Eに示す。図9C中、#1及び#2は、それぞれ別々のウェルの結果を示す。
Claims (14)
- (A)GSK3β阻害剤、及び
(B)DYRK阻害剤
を含有する多能性幹細胞培養用培地。 - 血清を含まない、請求項1に記載の培地。
- 分化抑制タンパク質を含まない、請求項1又は2に記載の培地。
- 含有されるタンパク質成分がインスリン及びトランスフェリンのみである、請求項1~3のいずれかに記載の培地。
- (A)成分が1-AzaKenpaullone、Kenpaullone、及びCHIR99021からなる群より選択される少なくとも1種である、請求項1~4のいずれかに記載の培地。
- (A)成分が1-AzaKenpaulloneである、請求項1~5のいずれかに記載の培地。
- (B)成分がID-8、Harmine、及びIndirubin類似体からなる群より選択される少なくとも1種である、請求項1~6のいずれかに記載の培地。
- (B)成分がID-8である、請求項1~7のいずれかに記載の培地。
- 更に、(C)NFAT阻害剤を含有する、請求項1~8のいずれかに記載の培地。
- (C)成分がTacrolimusである、請求項9に記載の培地。
- フィーダー細胞非存在下での培養用である、請求項1~10のいずれかに記載の培地。
- 多能性幹細胞が霊長類由来細胞である、請求項1~11のいずれかに記載の培地。
- 請求項1~12のいずれかに記載の培地を用いる、多能性幹細胞の培養方法。
- (A)GSK3β阻害剤、及び
(B)DYRK阻害剤
を含有する、多能性幹細胞の分化抑制剤。
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WO2020116623A1 (ja) * | 2018-12-07 | 2020-06-11 | 関東化学株式会社 | 多能性幹細胞用未分化維持培地 |
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WO2022269007A1 (en) * | 2021-06-23 | 2022-12-29 | Università Degli Studi Di Milano - Bicocca | A molecule capable of inhibiting the integration of calcineurin with a substrate and uses thereof |
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