WO2022196444A1 - 細胞培養用滅菌容器 - Google Patents
細胞培養用滅菌容器 Download PDFInfo
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- WO2022196444A1 WO2022196444A1 PCT/JP2022/010012 JP2022010012W WO2022196444A1 WO 2022196444 A1 WO2022196444 A1 WO 2022196444A1 JP 2022010012 W JP2022010012 W JP 2022010012W WO 2022196444 A1 WO2022196444 A1 WO 2022196444A1
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- Prior art keywords
- cell
- water
- cell culture
- container
- soluble resin
- Prior art date
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Images
Classifications
-
- 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
- C12M23/02—Form or structure of the vessel
- C12M23/12—Well or multiwell plates
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/20—Material Coatings
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M3/00—Tissue, human, animal or plant cell, or virus culture apparatus
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M37/00—Means for sterilizing, maintaining sterile conditions or avoiding chemical or biological contamination
Definitions
- the present invention relates to a sterile container for cell culture.
- Patent Literature 1 discloses a method in which a polystyrene member is placed in a reaction vessel, ozone gas is circulated, oxygen is introduced to the surface to make it hydrophilic, and adsorption of proteins and the like to the surface of the polystyrene member is reduced. disclosed. In addition to this, a method of coating the inner surface of the container with a hydrophilic polymer is also known.
- the present invention has been made in view of the above-mentioned problems, and aims to provide a sterilized container for cell culture that is sufficiently sterilized yet maintains its low cell adsorption property and facilitates the formation of cell aggregates during cell culture. aim.
- a sterilized container for cell culture according to the present invention is a sterilized container for cell culture with low cell adsorption, which is made of a resin material and is capable of containing cells and a liquid medium for cell culture.
- a coating layer composed of a water-soluble resin having a hydrophilic functional group on a side chain is formed on the inner surface of the cell-receiving part; It is characterized in that it is bridged with the inner surface of the housing part, and is subjected to radiation sterilization with an absorption dose of radiation of 20 kGy or more and 45 kGy or less.
- FIG. 1 is a schematic perspective view of a sterilized container for cell culture (multiwell plate) according to this embodiment.
- FIG. FIG. 3 is a schematic enlarged cross-sectional view of a cell-holding portion of the sterilized container for cell culture (multiwell plate) according to the present embodiment.
- Fig. 2 is a schematic enlarged cross-sectional view showing an enlarged vicinity of the inner surface of the cell storage portion of the sterilized container for cell culture according to the present embodiment.
- Fig. 3 is a schematic enlarged cross-sectional view showing a state in which cell aggregates are formed in the cell storage portion of the sterilized container for cell culture (multiwell plate) according to the present embodiment.
- FIG. 1 is a perspective view schematically showing the cell culture sterilization container 100 according to the present embodiment.
- the cell culture sterilization container 100 is a cell culture sterilization container 100 having a low cell adsorption property, and is made of a resin material and is capable of containing cells and a liquid medium for cell culture.
- a coating layer 21 made of a water-soluble resin having a hydrophilic functional group in a side chain is formed on the inner surface 11a of the cell-holding part 11, and between the water-soluble resins.
- the water-soluble resin and the inner surface 11a of the cell-receiving portion 11 are crosslinked, and the radiation sterilization treatment is performed with an absorption dose of radiation of 20 kGy or more and 45 kGy or less.
- low cell adsorption means that, under the same culture conditions, the ratio of cell adsorption is lower than that of a sterilized container for cell culture that is made of a resin material and is not surface-treated (including formation of a coating layer).
- the “inner surface 11a of the cell containing portion 11” is the surface of the internal space capable of containing a liquid medium or the like in the cell containing portion 11 (for example, a well) of the sterilized container for cell culture 100 according to the present embodiment. .
- the cell containing portion 11 should be made of a resin material.
- "made of a resin material” means that the resin material is included as a main material (the resin material is 70% by mass or more, more preferably 80% by mass or more, and further preferably 90% by mass or more of the total mass.
- materials other than the resin material, such as additives may be included within a range that does not affect the effects of the present invention.
- the cell culture sterilization container 100 according to the present embodiment may be entirely made of a resin material (all members provided), or at least a part of the members other than the cell-holding portion 11 may be made of a resin material.
- the sterilization container 100 for cell culture according to the present embodiment may be made of other materials (for example, glass), it is more preferable that the entire cell culture sterilization container 100 is made of a resin material (especially the same resin material). This is because the sterilized container 100 for cell culture according to the present embodiment can be easily manufactured (injection molding, etc.).
- the resin material examples include polyolefin resins such as polypropylene resin, polyethylene resin, polymethylpentene resin, ethylene-propylene copolymer, cyclic polyolefin resins, polystyrene resins such as polystyrene, acrylonitrile-butadiene-styrene resin, Polyacrylic resins such as polyethylene terephthalate resin and polybutylene terephthalate resin; methacrylic resins such as polymethyl methacrylate resin; fluorine resins such as polytetrafluoroethylene; acrylic resins such as polyacrylonitrile; Resins such as polycarbonate resins, vinyl chloride resins, polyarylate resins, polysulfone resins, polyethersulfone resins, polyetheretherketone resins, and polyetherimide resins can be used.
- polyolefin resins such as polypropylene resin, polyethylene resin, polymethylpentene resin, ethylene-propylene copoly
- polystyrene-based resin from the viewpoint of moldability, transparency, radiation resistance (sterilization property), etc. required for containers for cell culture.
- the weight average molecular weight of the resin material is not particularly limited, it is preferably 10,000 or more and 500,000 or less, more preferably 20,000 or more and 100,000 or less. This is because when the weight-average molecular weight of the resin material used is within this range, moldability is more excellent.
- This weight average molecular weight is a value measured by a size exclusion chromatography method (Gel Permeation Chromatography system, Shodex KF-800 column, both manufactured by Showa Denko, elution solvent: tetrahydrofuran).
- the cell containing portion 11 of the sterilized container for cell culture 100 according to the present embodiment can be formed by, for example, injection molding, blow molding, injection blow molding, or vacuum molding using such a resin material as a main material. can also form the entire sterile container for cell culture 100 according to this embodiment.
- the form of the sterilized container for cell culture 100 is not particularly limited as long as it includes the cell containing portion 11 having an internal space capable of containing cells and a liquid medium for cell culture.
- a multiwell plate as shown in FIG. 1 a petri dish (dish), a resin-made flask, and the like can be used.
- other forms may be used as long as they are provided with the cell storage section 11 and can be installed and used in an environment in which cells can be cultured.
- multi-well plates and petri dishes used in bioreactor generation, drug efficacy and toxic substance evaluation, artificial organ development research, etc. from the viewpoint of being able to improve the accuracy of evaluation and research using cell aggregates is preferred.
- a multi-well plate is a sterile container 100 for cell culture that includes a plurality of wells that are cell storage units 11.
- a plate that includes, for example, 6, 12, 24, 48, 96, or 384 wells preferred. This is because cell culture can be performed simultaneously in a plurality of wells under the same conditions.
- the capacity of the cell-holding part 11 (capacity of the internal space capable of accommodating a liquid medium or the like) is not limited, but for example, the capacity of one cell-holding part 11 may be 0.05 mL or more, or 0.1 mL or more. can be Although the upper limit is not limited, it may be 20 mL or less, or 16 mL or less.
- the cell culture sterilization container 100 may further include other members (for example, a lid member, etc.) in addition to the member including the cell-holding portion 11 .
- the member including the cell-holding portion 11 may be provided with a gripping portion that can be gripped by hand.
- the sterilized container for cell culture 100 is hermetically packaged in two or more layers, more preferably three or more layers, with gas-permeable film materials (all film materials in the multiple packaging are gas-permeable). ), preferably as a hermetically packaged sterile container for cell culture.
- a sealed package with a configuration suitable for carrying in and using at a cell processing facility (CPF) or a cell processing center (CPC), etc., and a radiation odor that can be generated by the radiation sterilization treatment described later. This is because a product with little residue can be obtained.
- a film material having gas permeability and heat-sealing properties is preferable because it is easier to seal and package.
- a film material examples include, but are not limited to, a film material made of polyethylene (eg, HDPE, LDPE, LLDPE, etc.) or polypropylene.
- this film material has a gas permeability of 0.1 L/m 2 ⁇ day ⁇ atm or more measured at a temperature of 25°C and a relative humidity (RH) of 0%. It is more preferably 0.5 L/m 2 ⁇ day ⁇ atm or more, even more preferably 1.0 L/m 2 ⁇ day ⁇ atm or more.
- FIG. 2 is an enlarged cross-sectional view schematically showing the cell containing portion 11 of the sterile container for cell culture 100 according to the present embodiment.
- FIG. 3 is a schematic enlarged cross-sectional view showing the vicinity of the inner surface 11a of the cell containing portion 11 of the cell culture sterilization container 100 according to the present embodiment in a more enlarged manner.
- FIG. 4 is a schematic enlarged cross-sectional view showing a state in which cell aggregates 31 are formed in the cell containing portion 11 of the sterilized container for cell culture 100 according to this embodiment.
- the sterilized container 100 for cell culture according to the present embodiment for example, like the embodiment shown in FIG. A layer 21 is formed. Then, as shown in FIG. 3, between the water-soluble resins, that is, between the molecules of the water-soluble resin in the coating layer 21, and between the water-soluble resin (water-soluble resin molecules in the coating layer 21) and the cells All are bridged with the inner surface 11a of the portion 11 .
- the surface layer of the inner surface 11a of the cell-holding portion 11 contains a hydrophilic functional group, making it difficult for the cells housed in the cell-holding portion 11 to adhere to the container. As a result, the cells can easily gather near the bottom of the cell-holding part 11 during culture, and the container can easily form a cell aggregate 31 as shown in FIG. 4 .
- the “water-soluble resin” in the present embodiment is a resin that can be hydrated by ionic bonding or hydrogen bonding with water molecules and dissolved in water, and is 1.0 g or more per 100 g of water at 25 ° C. It is soluble.
- the “coating layer 21 composed of a water-soluble resin” means the coating layer 21 containing the water-soluble resin as a main component (for example, containing 80% by mass or more, further 90% by mass or more). It means that the water-soluble resin contained in the coating layer 21 is cross-linked and hardened so that the coating layer 21 is denatured to be water-insoluble. In other words, as long as the coating layer 21 is formed using a material containing a water-soluble resin as a main component, it may be crosslinked and cured to become water-insoluble.
- water-soluble resins having hydrophilic functional groups in side chains include saponified polyvinyl acetate, polyvinylpyrrolidone, polyethylene glycol, polyacrylamide, polymethacrylamide, polyhydroxyethyl methacrylate, polypentaerythritol triacrylate, poly Examples include pentaerythritol tetraacrylate, polydiethylene glycol diacrylate, copolymers of monomers constituting them, and copolymers of 2-methacryloyloxyethylphosphorylcholine and other monomers (eg, butyl methacrylate). Some of these water-soluble resins include those to which another hydrophilic functional group or the like is added as a side chain.
- one or more selected from saponified polyvinyl acetate, polyvinylpyrrolidone, and polyethylene glycol are more preferable. This is because stimulation to the cells can be suppressed thereby.
- the average degree of polymerization of the water-soluble resin is not particularly limited, but is preferably 100 to 10,000, and 200, because it facilitates formation of a uniform coating on the inner surface 11a of the cell-holding portion 11 and improves workability. ⁇ 5000 is more preferred.
- saponified polyvinyl acetate examples include polyvinyl alcohol or copolymers of vinyl alcohol and other compounds, hydrophilic group-modified, hydrophobic group-modified, anion-modified, cation-modified, amide group-modified or acetoacetyl group-modified. and a saponified product of vinyl alcohol and modified vinyl acetate modified with a reactive group such as
- 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 entire polyvinyl acetate.
- the water-soluble resin constituting the coating layer 21 has a hydrophilic functional group in its side chain, and may further have a functional group for cross-linking and curing.
- the functional group for may be a hydrophilic functional group or part thereof.
- These functional groups include, for example, hydroxyl groups, functional groups containing carbonyl groups (carboxy groups, aldehyde groups, ketone groups, ester groups, amide groups, etc.), radiation-reactive, photosensitive, and heat-reactive functional groups. is mentioned.
- a functional group containing a diazo group, an azide group, a diazide group, etc. which is a photosensitive hydrophilic functional group, is more preferable.
- a water-soluble resin having a functional group containing a carbonyl group more preferably a water-soluble resin having a functional group containing an aromatic azide group and / or a carbonyl group in the side chain, the following formula (Ia) or the following formula ( Water-soluble resins represented by Ib) are more preferred.
- R1 is a hydrocarbon group having a carbonyl and an amine and may contain an amide bond
- R2, R3, R4, and R5 are all hydrogen or alkyl groups
- r1 is 1 to 1000
- r2 is 40 to 4995
- r3 is 0 to 4000
- n is 1, 2 or 3.
- R2, R3, R4, and R5 are hydrogen. Since it can impart properties, it can be expected to have the effect of further improving the adhesion of the water-soluble resin to the container.
- R is a hydrocarbon group having carbonyl and amine
- r1 is 1-1000
- r2 is 40-4995
- r3 is 0-4000.
- the water-soluble resin represented by the above formula (Ia) is more preferably a water-soluble resin represented by the following formula (IIa).
- R is an alkyl group having a carbonyl and an amine and may contain an amide bond
- r1 is 1 to 1000
- r2 is 40 to 4995
- r3 is 0 to 4000
- n is 1, Shows 2 or 3.
- the coating layer 21 is formed by coating the inner surface 11a of the cell-holding part 11 with the water-soluble resin described above, and by light irradiation or the like, the molecules of the water-soluble resin contained in the coating layer 21 are crosslinked and cured. It is formed. That is, the structure is such that the water-soluble resins of the coating layer 21 are crosslinked (for example, the crosslinked structure 41 in FIG. 3). This cross-linking is preferably formed by the functional groups of the side chains of the water-soluble resin. Note that the coating layer 21 may contain some molecules of the water-soluble resin that are not cross-linked, as long as they are cross-linked and cured to such an extent that the structure of the coating layer 21 can be maintained. good.
- the crosslinked structure 41 in FIG. 3 simply shows the crosslinked structure between the molecules of the water-soluble resin, and does not represent the actual size or number of the crosslinked structure.
- the cross-linking structure 43 in FIG. 3 also shows the cross-linking structure between the water-soluble resin molecules and the inner surface 11a of the cell housing part 11 in an easy-to-understand manner. It does not represent
- the inner surface 11a of the cell-holding part 11 on which the coating layer 21 is formed is subjected to surface treatment such as hydrophilization and formation of surface treatment functional groups before the coating layer 21 is formed.
- surface treatment such as hydrophilization and formation of surface treatment functional groups before the coating layer 21 is formed.
- surface treatment include treatment for forming oxygen-containing functional groups.
- oxygen-containing functional groups include polar functional groups such as carbonyl groups (carboxy groups, aldehyde groups, ketone groups, ester groups, etc.), hydroxyl groups, ether groups, peroxide groups, and epoxy groups.
- a treatment for forming a carbonyl group as an oxygen-containing functional group is performed.
- the surface treatment for example, plasma treatment, corona discharge treatment, excimer laser treatment, flame treatment, etc. can be employed, and plasma treatment is particularly preferred.
- the amount of oxygen-containing functional groups formed by the above treatment is not particularly limited, but is preferably 0.01 to 100 nmol/cm 2 , particularly preferably 0.05 to 10 nmol/cm 2 . If the amount of oxygen-containing functional groups is less than the lower limit, the desired effect may not be sufficiently exhibited, and if the amount exceeds the upper limit, the properties of the inner surface 11a itself of the cell-holding portion 11 will change, making it suitable for cell culture. There is a possibility that the required performance as a container cannot be met.
- the water-soluble resin constituting the coating layer 21 has a side chain containing an aromatic azide group and a side chain containing a carbonyl group. and the carbonyl group of the water-soluble resin, and between the aromatic azide group of the water-soluble resin and the carbonyl group of the inner surface 11a of the cell housing portion 11. be. This is because these crosslinks are very easily formed, and the coating layer 21 is likely to be more stable against the radiation sterilization treatment to be described later.
- the thickness of the coating layer 21 is not particularly limited, it is preferably 0.1 to 50 ⁇ m, more preferably 0.5 to 20 ⁇ m.
- the thickness of the coating layer 21 is preferably uniform on the inner surface 11 a of the cell-holding portion 11 .
- the “thickness of the coating layer 21” is the length of the shortest distance from the surface of the coating layer 21 (the surface on the inner space side of the cell-holding portion 11) to the surface in contact with the inner surface 11a of the cell-holding portion 11. It is.
- the “uniform” thickness means that the thickness of the coating layer 21 formed on the inner surface 11a of the cell-holding portion 11 is measured at 10 arbitrary points, and the variation in the measured values (difference between maximum and minimum) is It means within 0.1 ⁇ m, more preferably within 0.05 ⁇ m.
- the thickness of this coating layer 51 is measured by an ellipsometer.
- the sterilized container for cell culture 100 according to the present embodiment in which the coating layer 21 as described above is formed on the inner surface 11a of the cell-holding portion 11, is sufficiently sterilized, but the coating layer 21 prevents the cell-holding portion from being sufficiently sterilized. Cells are difficult to adhere to the inner surface 11a of 11, and cell culture easily forms cell aggregates 31 as shown in FIG.
- the sterilization process (radiation sterilization process) of the cell culture sterilization container 100 according to the present embodiment will be described in detail below.
- the sterilized container for cell culture 100 is a container including the cell containing portion 11 having the coating layer 21 as described above. It is.
- the radiation is preferably ⁇ -rays or electron beams, and ⁇ -ray sterilization is particularly preferred in the case of mass production or multi-packaging as described above, from the viewpoint of radiation transparency.
- the absorption dose of radiation is more preferably 22.5 kGy or more and 40 kGy or less. With such a configuration, high sterility is provided, and since the predetermined coating layer 21 described above is maintained in a stable state, low cell adsorption is maintained, and cell aggregates are easily formed by cell culture. It has become.
- the coating layer 21 is characterized in that it is difficult to decompose even when subjected to radiation sterilization as described above, and that little substances are eluted from the coating layer 21 into the liquid medium or the like.
- the cell culture sterilization container 100 according to the present embodiment is sufficiently sterilized, but pure water is contained in the cell containing portion 11 so as to be 0.12 mL/cm 2 and heated at 37° C. for 72 hours. Then, the obtained test solution was placed in a cell with a layer length of 1 cm, and the absorbance measured when irradiated with UV light having a wavelength of 220 nm and the absorbance measured when irradiated with UV light having a wavelength of 241 nm were both 0.0.
- the decomposition of the coating layer 21 can be reduced even if the strong radiation sterilization treatment as described above is performed.
- the absorbance measured when irradiated with UV light having a wavelength of 220 nm may be more than 0.06, and may be 0.07 or more.
- the absorbance measured when irradiated with UV light having a wavelength of 241 nm may be greater than 0.03 and may be 0.04 or more.
- the amount of pure water described above is the amount relative to the surface area of the region in which the coating layer 21 is formed on the inner surface 11a of the cell-holding portion 11 that holds pure water.
- the above-described absorbance measurement is performed with a UV spectrophotometer.
- the cell culture sterilization container 100 has high sterility and facilitates formation of cell aggregates 31 as shown in FIG. 4 by cell culture.
- human hepatoma-derived cells HepG2
- 96 cell-holding portions 11 such as a multiwell plate
- FBS fetal bovine serum
- DMEM Dulbecco's Modified Eagle's Medium
- the container can have 88 or more, further 90 or more, further 92 or more, furthermore 95 or more cell storage portions 11 formed as described above.
- the cell culture sterilization container 100 has high sterility and low cell adsorption, even if it is subjected to the above radiation sterilization treatment.
- it may be one that has undergone sterilization other than radiation sterilization.
- the cell containing portion 11 and the like may be made of a highly heat-resistant resin material and subjected to dry heat sterilization or steam sterilization. In order to maintain the stability of the coating layer 21 and maintain its low cell adsorptivity at a high level, and to facilitate the formation of cell aggregates by cell culture, the above conditions are satisfied.
- it has a cell containing portion 11 which is made of a resin material and is capable of containing cells and a liquid medium for cell culture.
- a coating layer 21 composed of a water-soluble resin is formed, and the water-soluble resins are cross-linked and the water-soluble resin and the inner surface 11a of the cell-holding part 11 are bridged.
- FBS fetal bovine serum
- each cell-holding portion 11 When the number of human hepatoma-derived cells (HepG2) in each cell-holding portion 11 was set to 1 ⁇ 10 3 cells and the cells were cultured at 37° C. for 3 days, the cells were housed together with Dulbecco's Modified Eagle's Medium (DMEM).
- DMEM Dulbecco's Modified Eagle's Medium
- a sterilized container 100 for cell culture, wherein the number of cell-holding portions 11 in which one or more cell aggregates 31 having a diameter of 200 ⁇ m or more of human liver cancer-derived cells (HepG2) are formed is 88 or more, further 92 or more, further 95 or more. is preferable.
- the lower limit of the absorbance described above may be the same as described above.
- a container having a desired shape including the cell containing portion 11 is molded by injection molding or the like using a material made of a resin material as described above. do. Then, the coating layer 21 is formed on the inner surface 11a of the cell-holding portion 11 of the obtained container using the material containing the water-soluble resin as a main component as described above. It is preferable to form the coating layer 21 after subjecting the inner surface 11a of the cell-holding part 11 to surface treatment such as plasma treatment in an oxygen atmosphere.
- the coating layer 21 made of a water-soluble resin on the inner surface 11a of the cell-holding portion 11 for example, dipping or dispensing a water-soluble resin solution into the cell-holding portion 11 and then tilting the container.
- a method of discharging the solution or the like can be used.
- the coating layer 21 can be formed by bringing the water-soluble resin solution into contact with the inner surface 11a of the cell-holding part 11 and then drying the remaining solvent or the like.
- the water-soluble resin in this case is a solution prepared using a solvent so that the viscosity at 20° C. is preferably 1 mPa ⁇ s or more and 10 mPa ⁇ s or less, more preferably 2 mPa ⁇ s or more and 7 mPa ⁇ s or less. It is preferred to use
- the solvent in that case is water, or a mixture of water and an organic solvent can be used to increase the solubility. When the viscosity of the water-soluble resin solution used is within the above range, the coating layer 21 having excellent low cell adsorption capacity can be easily obtained.
- a step of cross-linking and curing between the water-soluble resins of the formed coating layer 21 and between the water-soluble resin and the inner surface 11a of the cell housing portion 11 to denature into a water-insoluble cured film is performed.
- This step can be performed by light irradiation treatment, heat treatment, radiation irradiation treatment, etc. as described above, and the workability, the properties of the water-soluble resin constituting the coating layer 21, and the inner surface 11a of the cell-holding part 11 may be appropriately selected according to the type of functional group formed in the .
- the light irradiation treatment (UV irradiation treatment, etc.) is a method that enables the cross-linking and curing treatment to be performed rapidly and can be performed with simple equipment.
- the light source for cross-linking and curing the coating layer 21 by light irradiation is not particularly limited, but an ultra-high pressure mercury lamp with an illuminance of about 5.0 mW/cm 2 or a UV lamp with an illuminance of about 0.1 mW/cm 2 can be used. can.
- Cross-linking and curing by light irradiation can be controlled by illuminance and irradiation time, so if a light source with low illuminance is used, the irradiation time can be lengthened. Crosslinking and curing are also possible.
- a stable coating layer 21 having hydrophilic functional groups on the surface layer can be constructed. At least part of the unreacted water-soluble resin may be removed by washing the surface of the coating layer 21 with water or an aqueous solvent after curing by crosslinking. By inserting such a cleaning step for the coating layer 21 after curing, the amount of eluted matter can be further reduced.
- the sterilized container for cell culture 100 according to the present embodiment in which the coating layer 21 as described above is formed, is sealed and packaged in two or more layers with a gas-permeable film material, if necessary.
- a gas-permeable film material for example, after boxing, etc., radiation sterilization as described above is performed.
- sterilization other than radiation sterilization may be performed.
- a sterilized container for cell culture with low cell adsorption comprising a cell containing portion made of a resin material capable of containing cells and a liquid medium for cell culture, wherein the cell containing portion A coating layer composed of a water-soluble resin having a hydrophilic functional group in a side chain is formed on the inner surface of the cell-holding part, and between the water-soluble resins and between the water-soluble resin and the inner surface of the cell-holding part
- a sterilized container for cell culture which is cross-linked between the cells, and is subjected to radiation sterilization treatment with an absorption dose of radiation of 20 kGy or more and 45 kGy or less.
- one or more cell aggregates with a diameter of 200 ⁇ m or more of the human liver cancer-derived cells are formed.
- the water-soluble resin constituting the coating layer has a side chain containing an aromatic azide group and a side chain containing a carbonyl group, and the carbonyl group is formed on the inner surface of the cell housing portion; Crosslinking between the aromatic azide group of the water-soluble resin and the carbonyl group of the water-soluble resin, and between the aromatic azide group of the water-soluble resin and the carbonyl group of the inner surface of the cell-housing part.
- the sterilized container for cell culture according to any one of (1) to (3).
- Any one of (1) to (4), wherein the water-soluble resin constituting the coating layer is a water-soluble resin represented by the above formula (Ia) or the above formula (Ib). sterilized container for cell culture.
- a sterilized container for cell culture with low cell adsorption comprising a cell containing part made of a resin material, capable of containing cells and a liquid medium for cell culture, wherein the cell containing part A coating layer composed of a water-soluble resin having a hydrophilic functional group in a side chain is formed on the inner surface of the cell-holding part, and between the water-soluble resins and between the water-soluble resin and the inner surface of the cell-holding part Pure water is stored in the cell storage part so as to have a volume of 0.12 mL/cm 2 and heated at 37° C. for 72 hours.
- the absorbance measured when UV light with a wavelength of 220 nm is irradiated and the absorbance measured when UV light with a wavelength of 241 nm is irradiated are both 0.10 or less, and human cells are placed in each of the 96 cell storage units.
- Liver cancer-derived cells (HepG2) were housed together with fetal bovine serum (FBS)-containing Dulbecco's Modified Eagle's Medium (DMEM), and the number of said human liver cancer-derived cells (HepG2) in each said cell-holding portion was 1 ⁇ 10 3 .
- the number of the cell-receiving portions where one or more cell aggregates having a diameter of 200 ⁇ m or more of the human hepatoma-derived cells (HepG2) are formed when the cells are cultured at 37° C. for 3 days is 88 or more.
- Example 1 A 96-well multiwell plate (width: 127.6 mm, length: 85.8 mm, height: 14 mm) as shown in FIG. 0 mm) was molded. The shape of the wells, which are the cell-retaining portions, was as shown in FIG. 8 mm and the volume per well was about 0.25 mL.
- the obtained multi-well plate was subjected to plasma treatment (oxygen plasma for 10 minutes) in an oxygen atmosphere using a plasma treatment apparatus (BRANSON/IPC SERIES7000). This imparted wettability to the plate surface.
- R is a group represented by the following formula (III)): a compound represented by the following formula (IIa) (water-soluble Resin with an average degree of polymerization of 1600 and a photosensitive group introduction rate of 0.65 mol%)) is dissolved in a 25% by volume ethanol aqueous solution in a light-shielding polypropylene container colored with a brown pigment, and a 0.5% by weight water-soluble resin solution is added.
- IIa water-soluble Resin with an average degree of polymerization of 1600 and a photosensitive group introduction rate of 0.65 mol%
- a cell suspension was prepared by dispersing HepG2 in a liquid medium (Dulbecco's Modified Eagle's Medium (DMEM) containing fetal bovine serum (FBS)), and the number of cells was added to the wells of the two types of sterile containers for cell culture obtained above. was 1 ⁇ 10 3 cells/well, and the cells were cultured at 37° C. for 3 days. As a result, it was confirmed under a microscope that one cell aggregate (spheroid) with a diameter of about 700 ⁇ m was formed in all the wells of all sterilized cell culture vessels.
- DMEM Dulbecco's Modified Eagle's Medium
- FBS fetal bovine serum
- Example 2 A petri dish-shaped container (capacity: 6.6 mL) with a diameter of 90 mm and a height of 1.16 mm was subjected to plasma treatment and water-soluble resin treatment in the same manner as in Example 1, and further UV irradiation and radiation sterilization ( ⁇ -ray irradiation) was performed.
- Three kinds of sterilized containers for cell culture were obtained by adjusting the absorption dose of ⁇ rays to 15.0 kGy, 25.0 kGy, or 40.0 kGy.
- the absorbance was 0.10 or less in all cases, indicating that there was little elution into the test solution. That is, the sterilized cell culture containers with absorbed doses of ⁇ -rays of 25.0 kGy and 40.0 kGy had almost the same amount of effluent as the sterilized containers for cell culture with absorbed doses of ⁇ -rays of 15.0 kGy. Therefore, even if strong radiation sterilization was applied, the coating layer was less decomposed, and the coating layer was stably maintained.
Abstract
Description
なお、以下に説明する実施形態は、本発明の理解を容易にするための一例に過ぎず、本発明を限定するものではない。すなわち、以下に説明する部材の形状、寸法、配置等については、本発明の趣旨を逸脱することなく、変更、改良され得るとともに、本発明にはその等価物が含まれることは勿論である。
また、すべての図面において、同様な構成要素には同様の符号を付し、重複する説明は適宜省略する。なお、いずれの図面についても、便宜上、符号を付していない(省略している)箇所がある。さらに、図面に示された各部材の寸法比率は、発明の理解を容易にするために、実際の寸法比率とは異なる場合がある。
まず、本実施形態に係る細胞培養用滅菌容器の概要について、図1を参照して詳細に説明する。なお、図1は、本実施形態に係る細胞培養用滅菌容器100を模式的に示した斜視図である。
次に、本実施形態に係る細胞培養用滅菌容器100の細胞収容部11の構成について図2から図4を参照して詳細に説明する。なお、図2は、本実施形態に係る細胞培養用滅菌容器100の細胞収容部11を模式的に示した拡大断面図である。また、図3は、本実施形態に係る細胞培養用滅菌容器100の細胞収容部11の内面11a付近をより拡大して示した模式的な拡大断面図である。さらに、図4は、本実施形態に係る細胞培養用滅菌容器100の細胞収容部11において細胞凝集塊31を形成させた状態を示した模式的な拡大断面図である。
また、上記式(Ib)中において、Rはカルボニルとアミンとを有する炭化水素基、r1は1~1000、r2は40~4995、r3は0~4000を示す。
なお、下記式(IIa)中において、Rはカルボニルとアミンとを有するアルキル基でアミド結合を含んでも良く、r1は1~1000、r2は40~4995、r3は0~4000、nは1、2または3を示す。
なお、この被覆層51の厚さは、エリプソメーターにより測定される。
本実施形態に係る細胞培養用滅菌容器100は、前述したような被覆層21が形成された細胞収容部11を備える容器が、放射線の吸収線量として20kGy以上45kGy以下の放射線滅菌処理が施されたものである。なお、この放射線は、γ線あるいは電子線であるのが好ましく、大量生産を行う場合や前述した多重包装などを行う場合は放射線透過性の点からγ線滅菌であるのが特に好ましい。また、放射線の吸収線量は、22.5kGy以上40kGy以下であるのがより好ましい。このような構成により、高い無菌性を備えるとともに、前述した所定の被覆層21が安定した状態で維持されているため、低細胞吸着性が保たれ、細胞培養により細胞凝集塊を形成し易いものとなっている。
ここで、上記した純水の量は、純水を収容する細胞収容部11の内面11aにおける被覆層21が形成された領域の表面積に対する量である。また、上記した吸光度の測定は、UV分光光度計により行う。
次に、本実施形態に係る細胞培養用滅菌容器100の製造方法について説明する。
(1)低細胞吸着性の細胞培養用滅菌容器であって、樹脂素材により構成された、細胞および液体培地を収容して細胞培養を行うことが可能な細胞収容部を備え、前記細胞収容部の内面には側鎖に親水性官能基を有する水溶性樹脂により構成された被覆層が形成され、且つ、前記水溶性樹脂どうしの間ならびに前記水溶性樹脂と前記細胞収容部の前記内面との間が架橋されており、さらに、放射線の吸収線量として20kGy以上45kGy以下の放射線滅菌処理が施された、細胞培養用滅菌容器。
(2)前記細胞収容部に0.12mL/cm2となるように純水を収容して37℃で72時間加熱し、得られた試験液を層長1cmのセルに入れ、波長220nmのUV光を照射したときに測定される吸光度および波長241nmのUV光を照射したときに測定される吸光度がいずれも0.10以下である、(1)に記載の細胞培養用滅菌容器。
(3)96の前記細胞収容部にそれぞれヒト肝癌由来細胞(HepG2)をウシ胎児血清(FBS)含有ダルベッコ改変イーグル培地(DMEM)とともに収容して前記細胞収容部の1つ当たりにおける前記ヒト肝癌由来細胞(HepG2)の細胞数を1×103cellとし、37℃で3日間細胞培養を行った場合に、前記ヒト肝癌由来細胞(HepG2)の直径200μm以上の細胞凝集塊が1以上形成される前記細胞収容部の数が88以上である、(1)または(2)に記載の細胞培養用滅菌容器。
(4)前記被覆層を構成する前記水溶性樹脂が芳香族アジド基を含む側鎖およびカルボニル基を含む側鎖を有し、前記細胞収容部の前記内面にカルボニル基が形成されており、前記水溶性樹脂の前記芳香族アジド基と前記水溶性樹脂の前記カルボニル基との間、ならびに前記水溶性樹脂の前記芳香族アジド基と前記細胞収容部の前記内面の前記カルボニル基との間が架橋されている、(1)~(3)のいずれか1つに記載の細胞培養用滅菌容器。
(5)前記被覆層を構成する前記水溶性樹脂が、上記式(Ia)または上記式(Ib)で表される水溶性樹脂である、(1)~(4)のいずれか1つに記載の細胞培養用滅菌容器。
(6)前記細胞収容部がウェルであり、前記細胞培養用滅菌容器が前記ウェルを複数備えるマルチウェルプレートである、(1)~(5)のいずれか1つに記載の細胞培養用滅菌容器。
(7)(1)~(6)のいずれか1つに記載の細胞培養用滅菌容器がガス透過性を有するフィルム材により2重以上に密封包装された、密封包装済み細胞培養用滅菌容器。
(8)低細胞吸着性の細胞培養用滅菌容器であって、樹脂素材により構成された、細胞および液体培地を収容して細胞培養を行うことが可能な細胞収容部を備え、前記細胞収容部の内面には側鎖に親水性官能基を有する水溶性樹脂により構成された被覆層が形成され、且つ、前記水溶性樹脂どうしの間ならびに前記水溶性樹脂と前記細胞収容部の前記内面との間が架橋されており、前記細胞収容部に0.12mL/cm2となるように純水を収容して37℃で72時間加熱し、得られた試験液を層長1cmのセルに入れ、波長220nmのUV光を照射したときに測定される吸光度および波長241nmのUV光を照射したときに測定される吸光度がいずれも0.10以下であり、さらに、96の前記細胞収容部にそれぞれヒト肝癌由来細胞(HepG2)をウシ胎児血清(FBS)含有ダルベッコ改変イーグル培地(DMEM)とともに収容して前記細胞収容部の1つ当たりにおける前記ヒト肝癌由来細胞(HepG2)の細胞数を1×103cellとし、37℃で3日間細胞培養を行った場合に、前記ヒト肝癌由来細胞(HepG2)の直径200μm以上の細胞凝集塊が1以上形成される前記細胞収容部の数が88以上である、細胞培養用滅菌容器。
ポリスチレン樹脂(PSジャパン社製、商品名:HF77)を用いて、射出成形により図1に示すような96ウェルの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。細胞収容部であるウェルの形状は図2に示すような形状とし、各ウェルの開口直径は6.2mm、深さは5.0mm、側壁の厚みは0 .8mmとし、ウェル1つ当たりの容量は約0.25mLとした。
この結果、いずれの細胞培養用滅菌容器も、全てのウェルに直径が約700μmのサイズの1個の細胞凝集塊(スフェロイド)が形成されていることを顕微鏡下で確認した。
90mm径、高さ1.16mmのシャーレ形状容器(容量:6.6mL)に、実施例1と同様の方法によりプラズマ処理、および水溶性樹脂処理を行い、さらに、同様のUV照射および放射線滅菌(γ線照射)を行った。なお、γ線の吸収線量は15.0kGy、25.0kGy、または40.0kGyとなるようにして、3種類の細胞培養用滅菌容器を得た。
この結果、いずれも吸光度が0.10以下であり、試験液中への溶出物が少ないことが示された。つまり、γ線の吸収線量が25.0kGy、および40.0kGyの細胞培養用滅菌容器は、γ線の吸収線量が15.0kGyの細胞培養用滅菌容器と溶出物の量がほぼ同じレベルであり、よって強い放射線滅菌が施されていても被覆層の分解が少なく、被覆層が安定して維持されていることが明らかとなった。
11 細胞収容部(ウェル)
11a 細胞収容部(ウェル)の内面
21 被覆層
31 細胞凝集塊
41 架橋構造(水溶性樹脂間)
43 架橋構造(水溶性樹脂-内面間)
Claims (8)
- 低細胞吸着性の細胞培養用滅菌容器であって、
樹脂素材により構成された、細胞および液体培地を収容して細胞培養を行うことが可能な細胞収容部を備え、
前記細胞収容部の内面には側鎖に親水性官能基を有する水溶性樹脂により構成された被覆層が形成され、且つ、前記水溶性樹脂どうしの間ならびに前記水溶性樹脂と前記細胞収容部の前記内面との間が架橋されており、
さらに、放射線の吸収線量として20kGy以上45kGy以下の放射線滅菌処理が施された、
細胞培養用滅菌容器。 - 前記細胞収容部に0.12mL/cm2となるように純水を収容して37℃で72時間加熱し、得られた試験液を層長1cmのセルに入れ、波長220nmのUV光を照射したときに測定される吸光度および波長241nmのUV光を照射したときに測定される吸光度がいずれも0.10以下である、請求項1に記載の細胞培養用滅菌容器。
- 96の前記細胞収容部にそれぞれヒト肝癌由来細胞(HepG2)をウシ胎児血清(FBS)含有ダルベッコ改変イーグル培地(DMEM)とともに収容して前記細胞収容部の1つ当たりにおける前記ヒト肝癌由来細胞(HepG2)の細胞数を1×103cellとし、37℃で3日間細胞培養を行った場合に、前記ヒト肝癌由来細胞(HepG2)の直径200μm以上の細胞凝集塊が1以上形成される前記細胞収容部の数が88以上である、請求項1または2に記載の細胞培養用滅菌容器。
- 前記被覆層を構成する前記水溶性樹脂が芳香族アジド基を含む側鎖およびカルボニル基を含む側鎖を有し、
前記細胞収容部の前記内面にカルボニル基が形成されており、
前記水溶性樹脂の前記芳香族アジド基と前記水溶性樹脂の前記カルボニル基との間、ならびに前記水溶性樹脂の前記芳香族アジド基と前記細胞収容部の前記内面の前記カルボニル基との間が架橋されている、請求項1~3のいずれか1項に記載の細胞培養用滅菌容器。 - 前記細胞収容部がウェルであり、前記細胞培養用滅菌容器が前記ウェルを複数備えるマルチウェルプレートである、請求項1~5のいずれか1項に記載の細胞培養用滅菌容器。
- 請求項1~6のいずれか1項に記載の細胞培養用滅菌容器がガス透過性を有するフィルム材により2重以上に密封包装された、密封包装済み細胞培養用滅菌容器。
- 低細胞吸着性の細胞培養用滅菌容器であって、
樹脂素材により構成された、細胞および液体培地を収容して細胞培養を行うことが可能な細胞収容部を備え、
前記細胞収容部の内面には側鎖に親水性官能基を有する水溶性樹脂により構成された被覆層が形成され、且つ、前記水溶性樹脂どうしの間ならびに前記水溶性樹脂と前記細胞収容部の前記内面との間が架橋されており、
前記細胞収容部に0.12mL/cm2となるように純水を収容して37℃で72時間加熱し、得られた試験液を層長1cmのセルに入れ、波長220nmのUV光を照射したときに測定される吸光度および波長241nmのUV光を照射したときに測定される吸光度がいずれも0.10以下であり、
さらに、96の前記細胞収容部にそれぞれヒト肝癌由来細胞(HepG2)をウシ胎児血清(FBS)含有ダルベッコ改変イーグル培地(DMEM)とともに収容して前記細胞収容部の1つ当たりにおける前記ヒト肝癌由来細胞(HepG2)の細胞数を1×103cellとし、37℃で3日間細胞培養を行った場合に、前記ヒト肝癌由来細胞(HepG2)の直径200μm以上の細胞凝集塊が1以上形成される前記細胞収容部の数が88以上である、
細胞培養用滅菌容器。
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