WO2013183777A1 - ヒトes細胞用培養容器 - Google Patents
ヒトes細胞用培養容器 Download PDFInfo
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- WO2013183777A1 WO2013183777A1 PCT/JP2013/065891 JP2013065891W WO2013183777A1 WO 2013183777 A1 WO2013183777 A1 WO 2013183777A1 JP 2013065891 W JP2013065891 W JP 2013065891W WO 2013183777 A1 WO2013183777 A1 WO 2013183777A1
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/06—Animal cells or tissues; Human cells or tissues
- C12N5/0602—Vertebrate cells
- C12N5/0603—Embryonic cells ; Embryoid bodies
- C12N5/0606—Pluripotent embryonic cells, e.g. embryonic stem cells [ES]
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/06—Bioreactors or fermenters specially adapted for specific uses for in vitro fertilization
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/02—Form or structure of the vessel
- C12M23/12—Well or multiwell plates
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/20—Material Coatings
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M25/00—Means for supporting, enclosing or fixing the microorganisms, e.g. immunocoatings
- C12M25/06—Plates; Walls; Drawers; Multilayer plates
Definitions
- the present disclosure relates to a method for culturing a culture vessel for human ES cells.
- Embryonic stem cells have multipotency to differentiate into various tissue cells. For this reason, various studies have been conducted for application in the field of so-called regenerative medicine, in which cells lost due to illness or accidents are repaired and tissues are repaired (for example, Patent Document 1).
- ES cells have a variety that can be differentiated into various cells. It involves the interrelationship between cells, one of which is the formation of a cell mass called an embryonic body (EB).
- EB embryonic body
- This cell mass is formed by suspension culture of ES cells, iPS cells, and the like, and when cultured for about 2 weeks in a state where the cell mass is formed, differentiation into various cell types is observed. For this reason, embryoid bodies are used as one of the general methods for examining the pluripotency of cells.
- the hanging drop culture is a method of culturing cells in a culture solution suspended in a water droplet shape.
- this method has problems such as a low success rate of embryoid body formation, inability to observe with a microscope, and complicated operation.
- a culture container in which a water-insoluble cured film obtained by curing a water-soluble resin film on the inner surface of the container has been proposed (for example, Patent Document 2).
- Patent Document 1 Japanese Patent Laid-Open No. 2008-99662
- Patent Document 2 Japanese Patent Laid-Open No. 2008-178367
- mouse ES cells are often used in ES cell research. From the perspective of clinical application, research and development using human ES cells is required, but human ES cells are more susceptible to cell death than mouse ES cells, and it is difficult to obtain embryoid bodies. There is. Therefore, there is a need for a culture vessel that can form embryoid bodies more efficiently from human ES cells.
- the present disclosure provides a culture container capable of efficiently forming an embryoid body from human ES cells.
- the present disclosure relates to a container for culturing human ES cells in one or a plurality of embodiments.
- the human ES cell culture vessel has two or more wells.
- the well has a cylindrical body and a funnel-shaped bottom provided at one end of the body, the center of the bottom is a concave curved surface, and the opening angle of the bottom is 60 to 100 degrees.
- the culture container according to the present disclosure can efficiently form embryoid bodies from human ES cells.
- FIG. 1 is a cross-sectional view of a well in a culture container according to Embodiment 1.
- FIG. FIG. 2 is a perspective view of the culture vessel in the first embodiment.
- FIG. 3 is a photomicrograph of the shape of cell aggregates during human ES cell culture in Example 1.
- FIG. 4 is a photomicrograph of the shape of cell aggregates during human ES cell culture in Comparative Example 1.
- the shape of the well bottom is formed into a funnel shape having an opening angle of 60 to 100 degrees, and the central portion thereof has a concave round shape, whereby an embryoid body can be efficiently obtained from human ES cells. Based on the knowledge that it can be formed.
- the culture container according to the present disclosure is suitable for culturing human ES cells, and the reason why an embryoid body can be efficiently formed from human ES cells by using the culture container according to the present disclosure is not necessarily clear, but is as follows. Is estimated. Since the bottom of the well has an inclined surface with an opening angle of 60 to 100 degrees, when the cells in a single cell dispersed state are dispensed into the well, the area of the cell assembly observed from the top is reduced. It is considered that the cell density at the end of the gathering part is high, which makes it easy to form a single cell aggregate. In addition, it is considered that the central portion of the well bottom is a concave curved surface, so that cells near the bottom of the well are easily incorporated into the aggregate and a single cell aggregate is easily formed. However, the present disclosure is not limited to these mechanisms.
- a container for culturing human embryonic stem cells (human ES cells), Have two or more wells, The well has a cylindrical barrel, and a funnel-shaped bottom provided at one end of the barrel, The center of the bottom is a concave curved surface, A culture vessel for human ES cells, wherein the opening angle of the bottom is 60 to 100 degrees; [2] The culture vessel according to [1], wherein a radius of curvature of the inner surface of the central portion of the bottom is 0.5 to 1.5 mm; [3] The inner surface of at least the bottom of the well is formed with a coating layer formed using a water-soluble resin represented by the following formula (Ia) or (Ib): [1] or [2] The described culture vessel, (In the formula (Ia), R represents an alkyl group having a carbonyl and an amine, r1 represents 1 to 1000, r2 represents 40 to 4995, r3 represents 0 to 4000,
- the cross-sectional shape passing through the center line of the body portion is such that the body portion is rectangular, the bottom portion is substantially V-shaped, and the center portion of the bottom portion is arcuate.
- the culture vessel according to any one of [5]; [7] The culture container according to any one of [1] to [6], which is a 96-well plate; [8] A method of culturing human embryonic stem cells using a culture vessel,
- the culture vessel has two or more wells;
- the well has a cylindrical body and a funnel-shaped bottom provided at one end of the body, The center of the bottom is a concave curved surface, A culture method in which the opening angle of the bottom is 60 to 100 degrees;
- the present disclosure relates to a container for culturing human ES cells.
- the human ES cell culture vessel has two or more wells. According to the culture container concerning this indication, an embryoid body can be efficiently formed from a human ES cell. Further, the culture container according to the present disclosure is suitable for culturing human ES cells among ES cells because it can efficiently form embryoid bodies. For example, it is suitable for culturing human ES cells compared to mouse ES cells. ing.
- the well has a cylindrical body part and a funnel-shaped bottom part provided at one end of the body part, and the center part of the bottom part is a curved surface. That is, the bottom portion can be said to be an inverted conical shape having a partially spherical vertex.
- the body portion may be substantially cylindrical.
- the cross-sectional shape passing through the center line of the well is a substantially V shape in which the body is rectangular and the bottom is arc-shaped in the center.
- the connecting portion between the body portion and the bottom portion is preferably a curved surface.
- the well includes a side wall surface in which the side wall inner surface is substantially parallel, an inclined surface in which the side wall inner surface formed at one end of the side wall surface is reduced in diameter toward the bottom surface, and one end of the inclined surface.
- the shape which has the partial spherical center part formed in this may be sufficient.
- the opening angle of the bottom is 60 to 100 degrees, and is preferably greater than 60 degrees and less than or equal to 100 degrees, and more preferably 70 to 100 degrees, because the area of the cell assembly site observed from the upper part at the time of cell seeding is narrowed. More preferably, it is 80 to 90 degrees.
- the “open angle” in the present disclosure refers to an angle formed by the inclined surfaces facing each other at the bottom of the well, for example, an angle indicated by ⁇ in FIG.
- the radius of curvature at the inner surface of the central portion of the bottom is preferably 0.5 to 1.5 mm because cells near the bottom of the well are easily incorporated into the aggregate. Ease of observation of the cell aggregate by observation with an optical microscope is preferable. Therefore, 0.7 to 1.2 mm is more preferable, and 0.9 to 1.1 mm is more preferable.
- the “curvature radius of the inner surface of the central portion” in the present disclosure refers to a curved surface at the tip of the well bottom, for example, a curvature indicated by R in FIG.
- the radius of curvature of the inner surface of the central portion can be measured by a laser distance meter or actual measurement of a cut section of a molded product.
- the inner surface of the bottom of the well is subjected to a low cell adhesion treatment.
- the “cell low adhesion treatment” in the present disclosure refers to a treatment for reducing the adhesion of the well inner surface to cells.
- the reduction in adhesion includes, for example, that it becomes difficult for the inner surface of the well and the cell to adhere, and that the inner surface of the well and the cell do not adhere.
- Examples of the cell low adhesion treatment include hydrophilic treatment on the inner surface of the well.
- Examples of the hydrophilization treatment include formation of a coating layer using a water-soluble resin and formation of a coating layer using a hydrophilic resin.
- the “water-soluble resin” in the present disclosure is one that is hydrated by an ionic bond or hydrogen bond with a water molecule and dissolved in water, and can be dissolved in 1.0 g or more in 100 g of water at 25 ° C. Say.
- Examples of the water-soluble resin include those having a necessary and sufficient amount of ionic or polar side chains with respect to the main chain in the molecule in order to dissolve in water.
- water-soluble resins examples include saponified polyvinyl acetate, polyvinyl pyrrolidone, polyethylene glycol, polyacrylamide, polymethacrylamide, polyhydroxyethyl methacrylate, polypentaerythritol triacrylate, polypentaerythritol tetraacrylate, polydiethylene glycol diacrylate. And a copolymer of monomers constituting them, a copolymer of 2-methacryloyloxyethyl phosphorylcholine and another monomer (such as butyl methacrylate), and the like.
- a structure comprising at least one selected from saponified products of polyvinyl acetate, polyvinyl pyrrolidone, and polyethylene glycol and a functional group described later is preferable.
- stimulation with respect to various cells can be suppressed, and the formation speed of a cell aggregate, a formation rate, and the quality of the formed cell aggregate can be improved.
- Examples of the saponified product of polyvinyl acetate include polyvinyl alcohol or a copolymer of vinyl alcohol and other compounds, hydrophilic group modification, hydrophobic group modification, anion modification, cation modification, amide group modification or acetoacetyl group. Examples thereof include a saponified product of a modified vinyl acetate modified with a reactive group and vinyl alcohol.
- the average degree of polymerization of the polymer is not particularly limited, but is preferably from 100 to 10,000, more preferably from 200 to 5,000, from the viewpoint that a uniform film is easily formed on the inner surface of the culture vessel and the workability is good. More preferred.
- the saponification degree of the saponified product of polyvinyl acetate is not particularly limited, but is preferably 20 to 100 mol%, more preferably 50 to 95 mol% of the whole polyvinyl acetate.
- the water-soluble resin is preferably a water-soluble resin having a functional group for curing in the side chain.
- the functional group for curing include radiation-reactive, photosensitive, and heat-reactive functional groups.
- the photosensitive functional group include a diazo group, an azide group, and a simmonyl group.
- thermally reactive and radiation reactive functional groups include vinyl groups and epoxy groups.
- a water-soluble resin having a photosensitive functional group is preferable from the viewpoint that curing treatment can be performed quickly and curing can be performed with simple equipment.
- the water-soluble resin is preferably a water-soluble resin having an azide group, because a uniform coating layer can be formed at a wavelength of 300 to 500 nm, and the amount of cell adhesion can be reduced to improve the formation efficiency of cell aggregates.
- it is a water-soluble resin represented by the following formula (Ia) or (Ib).
- R represents an alkyl group having a carbonyl and an amine, and a group represented by the following formula (II) is preferable from the viewpoint of easy synthesis of a polar side chain.
- r1 is 1 to 1000, r2 is 40 to 4995, r3 is 0 to 4000, and n is 1, 2 or 3.
- r1 is 1 to 1000, r2 is 40 to 4995, and r3 is 0 to 4000.
- the hydrophilic resin is not particularly limited, and examples thereof include poly-2-hydroxyethyl methacrylate (poly-HEMA), a phosphorylcholine group-containing polymer compound, and a polyethylene glycol chain-containing polymer compound.
- the thickness of the coating layer is not particularly limited, but the amount of protein taken into the coating layer is reduced to reduce the physical stimulation that the cell receives from the substrate (well), and the cell is passed through the protein.
- the thickness is preferably from 100 to 5,000 nm, more preferably from 150 to 1,000 nm, from the point that the adhesion to the well can be suppressed and the cell aggregate formation efficiency can be further improved.
- the material of the culture vessel according to the present disclosure is not particularly limited, but a resin is preferable from the viewpoint that the culture vessel can be a disposable type and can be easily molded.
- the resin include polyolefin resins such as polypropylene resin, polyethylene resin, and ethylene-propylene copolymer or cyclic polyolefin resins, polystyrene resins such as polystyrene and acrylonitrile-butadiene-styrene resins, polycarbonate resins, and polyethylene terephthalate resins.
- Methacrylic resins such as polymethyl methacrylate resin, vinyl chloride resin, polybutylene terephthalate resin, polyarylate resin, polysulfone resin, polyethersulfone resin, polyetheretherketone resin, polyetherimide resin, polytetrafluoroethylene, etc.
- acrylic resins such as fluorine resins, polymethylpentene resins and polyacrylonitrile, and fibrous resins such as propionate resins.
- polystyrene resin is preferable from the viewpoints of moldability and sterility required for the culture container.
- Examples of the culture container according to the present disclosure include containers such as a multiwell plate, a petri dish (dish), and a flask. Any other form may be used as long as it can be installed and used in an environment where cells can be cultured. For example, a sheet-like molded article may be used.
- multi-well plates and petri dishes used in bioreactor generation or medicinal and toxicological evaluations, artificial organ development research, etc. can improve the accuracy of evaluation and research using cell aggregates. preferable.
- the number of wells in the multi-well plate is not particularly limited, and is, for example, 6, 12, 24, 48, 96, or 384.
- the culture container according to the present disclosure can be manufactured as follows.
- the use of the culture vessel is for measuring a labeling substance using luminescence or fluorescence
- the method for example, a method of molding with a colored resin, a method of molding with a transparent resin, and then coating a container with an impermeable paint, a method of forming a metal film by plating or vapor deposition, etc. From the viewpoint of easy operation, a method of molding with a colored resin is preferable.
- the pigment may be kneaded and molded by adding a pigment to the transparent resin, or may be molded using a molded resin material in which the transparent resin and the pigment are kneaded.
- the transparent resin and the pigment It is preferable to mold using a molded resin material kneaded with.
- the pigment is not particularly limited, and can be appropriately determined according to the color to be colored, and examples thereof include white pigments, black pigments, etc., and better measurement sensitivity can be obtained, and the state of cell aggregates can be confirmed.
- white pigments are preferred from the viewpoint of easy confirmation of the presence or absence of the culture medium.
- white pigments include titanium oxide.
- the black pigment include carbon black.
- the amount of the pigment is preferably 7 to 15% by weight in the case of titanium oxide and 3 to 10% by weight in the case of carbon black from the viewpoint of obtaining a resin molded product exhibiting sufficient light shielding properties and sufficient strength.
- the degree of light shielding is preferably small if the light transmittance to adjacent wells is small, for example, 1% or less, preferably 0.1%, more preferably 0.01% or less.
- the above-mentioned water-soluble resin is brought into contact with the inner surface of the well.
- the contact method include spin coating, dipping, and dispensing a water-soluble resin solution to the well surface.
- the water-soluble resin is preferably brought into contact with the water-soluble resin dissolved in a solvent.
- the solvent include water, a mixture of water and an organic solvent, and the like.
- the concentration of the water-soluble resin to be contacted is not particularly limited, but a uniform coating layer can be obtained, a sufficient cell low adhesion effect can be obtained, and a good cell aggregate can be formed. 0.01 to 30 wt% is preferable, and 0.1 to 10 wt% is more preferable.
- the water-soluble resin After drying the water-soluble resin, the water-soluble resin is cured. Thereby, the resin coating layer which has a high density ionic or polar side chain is formed.
- the ionic or polar side chain constructed on this surface hydrates with water molecules by electrostatic interaction or hydrogen bonding when in contact with the culture solution, and the surface of the culture vessel is substantially dense with water molecules. This becomes a hydrated layer, and this hydrated layer suppresses the stimulation from the surface of the substrate to the cells, and a qualitatively good cell aggregate is rapidly formed. By doing so, it is possible to prevent the water-soluble resin coating layer from being dissolved and released when the culture solution is brought into contact, and to obtain water resistance necessary for the culture vessel.
- a poly-HEMA layer when forming a coating layer using a hydrophilic resin, for example, a poly-HEMA layer can be formed by dispensing 100 ⁇ L of a 2% ethanol solution of poly-HEMA into a well and evaporating ethanol. . After evaporation, excess poly-HEMA molecules not adsorbed on the container surface can be removed by washing with ultrapure water or a buffer solution.
- Sterilization includes, for example, ethylene oxide gas sterilization, dry heat sterilization, steam sterilization, radiation sterilization, etc., and radiation sterilization using ⁇ rays or electron beams is preferable. And ⁇ -ray sterilization is more preferable.
- the present disclosure relates to a method of culturing human ES cells using a culture container.
- a culture vessel used in the culture method according to the present disclosure has two or more wells, and the well has a cylindrical body and a funnel-shaped bottom provided at one end of the body, and the bottom The center part of this is a concave curved surface, and the opening angle of the bottom part is 60 to 100 degrees.
- this indication is related with the method of culture
- embryoid bodies can be efficiently formed from human ES cells.
- the radius of curvature of the inner surface of the center of the bottom is 0.5 to 1.5 mm.
- FIG. 1 is a cross-sectional view of the well of the culture container according to the first embodiment
- FIG. 2 is a perspective view of the culture container (96-well multiwell plate) according to the first embodiment.
- the well 1 of the culture container according to the first embodiment has a substantially cylindrical body portion 2 and a bottom portion 3 having a funnel shape, and a central portion 4 of the bottom portion 3 is hemispherical.
- the bottom 3 has an inclined surface with an opening angle ( ⁇ ) of 85 degrees, and the radius of curvature of the inner surface of the bottom center is 1.0 mm.
- the opening angle ( ⁇ ) can be obtained by measuring the angle formed by the opposed inclined surfaces of the bottom 3.
- the diameter of the well opening is preferably, for example, 4.0 mm or more from the viewpoint of excellent operability when using a multi-dispenser, and is preferably 11.0 mm or less from the viewpoint of increasing the number of wells per culture vessel. preferable.
- the volume per well is not particularly limited, but is preferably 80 to 500 ⁇ L from the viewpoint that a sufficient amount of medium can be added to form embryoid bodies. 80 to 200 ⁇ L is more preferable from the viewpoint of reducing the amount.
- Example 1 [Manufacture of culture vessels] A 96-well multiwell plate (width: 127.6 mm, length: 85.8 mm, height: 14.0 mm) was molded by injection molding using polystyrene resin (manufactured by PS Japan, trade name: HF77). The shape of each well was the shape shown in FIG. 1, the opening angle of the bottom ( ⁇ in FIG. 1) was 85 degrees, and the radius of curvature of the inner surface at the center of the bottom was 1.0 mm.
- the obtained plate was subjected to plasma treatment (oxygen plasma for 10 minutes) using a plasma treatment apparatus (SERIES7000, manufactured by BRANSON / IPC). This imparted wettability to the plate surface.
- the culture solution was D-MEM / F12 (Sigma D6421) with a final concentration of 20% KSR (Invitrogen / Gibco-BRL), 1 ⁇ NEAA (non-essential amino acid; Invitrogen / Gibco BRL), 2 mM L-glutamic acid, 0.1 mM. What added 2-mercaptoethanol and 5 ng / ml bFGF (Upstate) was used. Planting was carried out every 3-4 days.
- Human ES cells were dissociated from the feeder layer, dispersed into small cell masses (about 10-20 cells) by pipetting, and then seeded on the feeder layer formed by seeding MEF the day before.
- Human embryonic stem cells are human blastocyst-derived embryonic stem cells (KhES-1, KhES-2 and KhES-3) established in the Institute of Regenerative Medicine, Kyoto University. Were used according to the government guidelines regarding (mainly KhES-1).
- ROCK inhibitor Y-27632 was added at a concentration of 10 ⁇ M to the human ES cells cultured as described above, and then the human ES cells were dissociated from the feeder cells as small cell clusters. .
- the dissociated small cell mass was placed on a cell-adhesive culture plate (0.1% gelatin coated), and cultured in a maintenance culture solution at 37 ° C. for 1 hour. The contaminating feeder cells were adsorbed to the culture plate.
- Human ES cell mass from which feeder cells have been removed is dispersed into single cells by TrypLE Express containing 0.05 mg / ml DnaseI (Roche) and ROCK inhibitor Y-27632 at 10 ⁇ M, and 9 ⁇ 10 3 cells per well are dispersed.
- the culture vessel was subjected to surface treatment in a state of being suspended in 100 ⁇ l of differentiation medium so that an aggregate was rapidly formed, and then incubated at 37 ° C. and 5% CO 2 for 6 days to reaggregate. The state of the cell mass was evaluated.
- the differentiation medium was G-MEM (Invitrogen) with a final concentration of 20% KSR, 20 ⁇ M Y-27632, 1 ⁇ NEAA, 1 mM pyruvic acid, 0.1 mM 2-mercaptoethanol, 100 U / ml penicillin, 100 ⁇ g / ml streptomycin. The added one was used.
- Example 2 A multiwell plate was obtained in the same manner as in Example 1 except that a commercially available multiwell plate (MS-9096M, manufactured by Sumitomo Bakelite Co., Ltd., U bottom, opening angle: 19 degrees, bottom radius of curvature: 2.0 mm) was used. Using it, cell aggregate formation and evaluation were performed. The results are shown in Table 1 below.
- MS-9096M manufactured by Sumitomo Bakelite Co., Ltd., U bottom, opening angle: 19 degrees, bottom radius of curvature: 2.0 mm
- Example 1 As shown in FIG. 3, in Example 1, a single aggregate was observed from 18 hours after the start of culture, and finally a single aggregate was formed in the well. On the other hand, in Comparative Example 1, as shown in FIG. 4, a plurality of small-sized aggregates were observed around the large aggregate. Although the figure of the comparative example 2 is not presented, a small agglomerate equivalent to that in FIG. 4 was observed.
- the present disclosure is useful in medical fields such as human ES cell research and regenerative medicine.
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Abstract
Description
[1] ヒト胚性幹細胞(ヒトES細胞)を培養するための容器であって、
2個以上のウェルを有し、
前記ウェルは、筒状の胴部と、前記胴部の一端に設けられた漏斗形状の底部とを有し、
前記底部の中心部は、凹曲面であり、
前記底部の開き角度は、60~100度である、ヒトES細胞用培養容器;
[2] 前記底部の中心部内面の曲率半径は、0.5~1.5mmである[1]記載の培養容器;
[3] 前記ウェルの少なくとも底部の内面は、下記式(Ia)又は(Ib)で表される水溶性樹脂を用いて形成された被覆層が形成されている、[1]又は[2]に記載の培養容器、
[4] 前記ウェルは、側壁内面が略平行となる側壁面と、前記側壁面の一端に形成された側壁内面が底面に向かって縮径する傾斜面と、前記傾斜面の一端に形成された部分球状の中心部とを有する、[1]から[3]のいずれかに記載の培養容器;
[5] 前記筒部は、略円筒状である、[1]から[4]のいずれかに記載の培養容器;
[6] 前記ウェルにおいて、前記胴部の中心線を通る断面形状は、前記胴部が矩形であり、前記底部が略V字形状であって前記底部の中心部が弧状である、[1]から[5]のいずれかに記載の培養容器;
[7] 96ウェルプレートである、[1]から[6]のいずれかに記載の培養容器;
[8] 培養容器を用いて、ヒト胚性幹細胞を培養する方法であって、
前記培養容器は、2個以上のウェルを有し、
前記ウェルは、筒状の胴部と前記胴部の一端に設けられた漏斗状の底部とを有し、
前記底部の中心部は、凹曲面であり、
前記底部の開き角度は、60~100度である、培養方法;
[9] 前記底部の中心部内面の曲率半径は、0.5~1.5mmである、[8]記載の培養方法;
[10] [1]から[7]のいずれかに記載の培養容器を用いてヒト胚性幹細胞を培養する方法。
本開示は、一又は複数の実施形態において、ヒトES細胞を培養するための容器に関する。前記ヒトES細胞用培養容器は、2個以上のウェルを有する。本開示にかかる培養容器によれば、ヒトES細胞から効率よく胚様体を形成することができる。また、本開示にかかる培養容器は、効率よく胚様体を形成できる点から、ES細胞の中でもヒトES細胞の培養に適しており、例えばマウスES細胞と比較してヒトES細胞の培養に適している。
本開示は、一又は複数の実施形態において、培養容器を用いたヒトES細胞を培養する方法に関する。本開示にかかる培養方法に用いる培養容器は、2個以上のウェルを有し、ウェルは、筒状の胴部と前記胴部の一端に設けられた漏斗状の底部とを有し、前記底部の中心部は、凹曲面であり、底部の開き角度は、60~100度である。また、本開示は、一又は複数の実施形態において、本開示にかかる培養容器を用いてヒト胚性幹細胞を培養する方法に関する。本開示にかかる培養方法によれば、上記の培養容器を用いるため、ヒトES細胞から胚様体を効率よく形成することができる。
図1は、実施形態1にかかる培養容器のウェルの断面図であり、図2は実施形態1にかかる培養容器(96ウェルマルチウェルプレート)の斜視図である。図1に示すように、実施形態1にかかる培養容器のウェル1は、略円筒状の胴部2と、漏斗形状である底部3とを有し、底部3の中心部4は半球状である。底部3は開き角度(θ)は85度である傾斜面を有し、底部中心部内面の曲率半径は1.0mmである。開き角度(θ)は、図1に示すように、底部3の対向する傾斜面がなす角を測定することにより得ることができる。
[培養容器の製造]
ポリスチレン樹脂(PSジャパン社製、商品名:HF77)を用いて、射出成形により96ウェルマルチウェルプレート(横:127.6mm、縦:85.8mm、高さ:14.0mm)を成形した。各ウェルの形状は図1に示す形状とし、底部の開き角度(図1におけるθ)は85度、底部中心部における内面の曲率半径は1.0mmとした。
ウェルの表面処理を行うために、水溶性樹脂として側鎖にアジド基を有するポリビニルアルコール(東洋合成工業社製 AWP(Azide-unit pendant Water soluble Photopolymer、r1=1~1000、r2=4~4995、r3=0~4000、n=1,2、または3、Rはカルボニルとアミンを有するアルキル基):下記式(Ia)で表される化合物(水溶性樹脂の平均重合度1600、感光基の導入率0.65mol%))を着色樹脂にて遮光したポリプロプレン容器中で、25容量%エタノール水溶液に溶解し、0.3重量%の水溶性樹脂溶液を調製した。
Suemoriら, Biochem Biophys Res Commun. 345, 926-32 (2006)に記載された方法に従い、細胞のフィーダー層としてマウス胎児線維芽細胞(マイトマイシン処理で不活化、MEF)を蒔いたプラスチック培養皿の上で未分化ヒト胚性幹細胞を37℃、2% CO2下で培養した。なお、Suemoriら, Biochem Biophys Res Commun. 345, 926-32 (2006)は、参照により本明細書に組み込まれる。培養液は、D-MEM/F12(Sigma D6421)に最終濃度20%のKSR(Invitrogen/Gibco-BRL)、1×NEAA(非必須アミノ酸;Invitrogen/Gibco BRL)、2mM L-グルタミン酸、0.1mM 2-メルカプトエタノール及び5ng/ml bFGF(Upstate)を添加したものを使用した。植え継ぎは3-4日毎に行った。解離液(リン酸バッファー緩衝生理学的食塩水に0.25%トリプシン、1mg/mlコラゲナーゼIV液、1mM CaCl2、最終濃度20%のKSRを添加したもの;全てInvtrogen/Gibco-BRL)を用いて、ヒトES細胞をフィーダー層から解離し、ピペッティングで小細胞塊(約10-20個)に分散した後、前日にMEFを播種し形成させたフィーダー層の上に蒔いた。なお、ヒト胚性幹細胞は、京都大学再生医科学研究所中辻憲夫研究室で樹立したヒト胚盤胞由来の胚性幹細胞(KhES-1、KhES-2及びKhES-3)を、ヒト胚性幹細胞に関する政府指針に従い分与を受け、使用した(主にKhES-1)。
A:ウェル内に単一の凝集塊が形成
B:凝集塊が形成するも周囲に小さな凝集塊が複数形成
C:凝集塊が形成されない
市販品のU底のマルチウェルプレートを使用した以外は、実施例1と同様にしてマルチウェルプレートを得て、それを用いて細胞凝集塊形成及び評価を行った。その結果を下記表1に示す。市販品のマルチウェルプレートは、住友ベークライト社製 MS-309URを使用した(横:127.6mm、縦:85.8mm、高さ:14.0mm、ウェルの開口部直径:7.0mm、ウェルの深さ:10.0mm、底部内面の曲率半径:3.2mm)。なお、評価は、n=5~10で行った。また、形成された細胞凝集塊を顕微鏡観察して得られた写真を図4に示す(培養時間:2日間)。
市販のマルチウェルプレート(住友ベークライト社製 MS-9096M、U底、開き角度:19度、底面曲率半径:2.0mm)を使用した以外は、実施例1と同様にしてマルチウェルプレートを得て、それを用いて細胞凝集塊形成及び評価を行った。その結果を下記表1に示す。
Claims (10)
- ヒト胚性幹細胞(ヒトES細胞)を培養するための容器であって、
2個以上のウェルを有し、
前記ウェルは、筒状の胴部と、前記胴部の一端に設けられた漏斗形状の底部とを有し、
前記底部の中心部は、凹曲面であり、
前記底部の開き角度は、60~100度である、ヒトES細胞用培養容器。 - 前記底部の中心部内面の曲率半径は、0.5~1.5mmである、請求項1記載の培養容器。
- 前記ウェルは、側壁内面が略平行となる側壁面と、前記側壁面の一端に形成された側壁内面が底面に向かって縮径する傾斜面と、前記傾斜面の一端に形成された部分球状の中心部とを有する、請求項1から3のいずれかに記載の培養容器。
- 前記胴部は、略円筒状である、請求項1から4のいずれかに記載の培養容器。
- 前記ウェルにおいて、前記胴部の中心線を通る断面形状は、前記胴部が矩形であり、前記底部が略V字形状であって前記底部の中心部が弧状である、請求項1から5のいずれかに記載の培養容器。
- 96ウェルプレートである、請求項1から6のいずれかに記載の培養容器。
- 培養容器を用いて、ヒト胚性幹細胞を培養する方法であって、
前記培養容器は、2個以上のウェルを有し、
前記ウェルは、筒状の胴部と前記胴部の一端に設けられた漏斗状の底部とを有し、
前記底部の中心部は、凹曲面であり、
前記底部の開き角度は、60~100度である、培養方法。 - 前記底部の中心部内面の曲率半径は、0.5~1.5mmである、請求項8記載の培養方法。
- 請求項1から7のいずれかに記載の培養容器を用いてヒトES細胞を培養する方法。
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