WO2023027147A1 - 細胞培養用チップ、細胞培養用デバイス、細胞培養用チップの製造方法、及び細胞の培養方法 - Google Patents
細胞培養用チップ、細胞培養用デバイス、細胞培養用チップの製造方法、及び細胞の培養方法 Download PDFInfo
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- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000012581 transferrin Substances 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- C12M25/02—Membranes; Filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
-
- 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
- C12M23/16—Microfluidic devices; Capillary tubes
-
- 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
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2535/00—Supports or coatings for cell culture characterised by topography
- C12N2535/10—Patterned coating
-
- C—CHEMISTRY; METALLURGY
- 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
- C12N2537/00—Supports and/or coatings for cell culture characterised by physical or chemical treatment
- C12N2537/10—Cross-linking
Definitions
- the present invention relates to a cell culture chip, a cell culture device, a cell culture chip manufacturing method, and a cell culture method.
- monolayer culture which has been used in conventional cell assays, the environment surrounding cells is significantly different from that in vivo. Therefore, monolayer cultured cells often have the problem that many of the functions expressed by the cells in vivo are lost.
- Recent advances in microfabrication technology and three-dimensional culture technology are expected to overcome this problem and simultaneously improve the throughput and reliability of cell assays.
- organ-on-a-chip which treats a cell culture chip equipped with a microfluidic device that reproduces a physiological three-dimensional culture environment in vitro as if it were a single organ, has spread and is being applied to drug development.
- MPS Microphysiological System
- the substrate on which the cell culture channel is formed and the top plate blocking the cell culture channel are coated with an adhesive layer made of a polyester resin having a Tg of 5° C. or higher.
- An adhesive layer made of a polyester resin having a Tg of 5° C. or higher has been proposed (for example, Patent Document 1).
- the human body mimetic system as described above is attracting attention as a technique for evaluating the efficacy and safety of drugs in vitro.
- drug evaluation cells are cultured in the presence of a drug in a cell culture chip that constitutes the MPS, and the effect of the drug on the cells is observed.
- As a cell culture chip used for drug evaluation there is no leakage of cell culture medium under perfusion conditions around 37°C, which is close to human body temperature, culture and observation of cells to be evaluated are possible, and there is little decrease in drugs. and other conditions are required.
- microscopic unevenness is generated on the processed surface. The drug is likely to be adsorbed on these irregularities, which is a factor in reducing the drug in the liquid medicine.
- the present invention has been made in view of the above circumstances, and includes a cell culture chip capable of suppressing adsorption of a drug to a laser-processed flow path partition wall, a cell culture device comprising the cell culture chip, and the An object of the present invention is to provide a method for manufacturing a cell culture chip and a method for culturing cells using the cell culture chip.
- the present invention adopts the following configuration.
- a first aspect of the present invention is a cell culture chip including a laminate having a channel structure therein, wherein the laminate comprises a bottom plate substrate and a channel substrate in which channels are formed by laser processing. , and a top plate substrate in this order, and the channel substrate has a glass transition temperature of 37° C. or higher, an elastic modulus of 1 ⁇ 10 9 Pa or higher at 25° C., and an elastic modulus of 1 at 150° C.
- a second aspect of the present invention is a cell culture device including the cell culture chip of the first aspect.
- a third aspect of the present invention is a method for manufacturing a cell culture chip including a laminate having a channel structure therein, comprising: a bottom plate substrate; a channel substrate in which channels are formed by laser processing; a step A of laminating a top plate substrate in this order; A method for producing a cell culture chip containing a resin having an elastic modulus of 1 ⁇ 10 9 Pa or more at 150° C. and an elastic modulus of 1 ⁇ 10 7 Pa or less at 150° C.
- a fourth aspect of the present invention is a method for culturing cells, comprising the step of culturing cells in the presence of a drug in the channel of the cell culture chip of the first aspect.
- a cell culture chip a cell culture device including the cell chip, a method for manufacturing the cell culture chip, and the A cell culture method using a cell culture chip is provided.
- FIG. 1 is a perspective view of a cell culture chip of one embodiment
- FIG. FIG. 2 is an exploded view of the cell culture chip of FIG. 1
- FIG. 2 is a cross-sectional view of the cell culture chip of FIG. 1 taken along line III-III.
- FIG. 2 is a cross-sectional view of the cell culture chip of FIG. 1 taken along line IV-IV.
- 1 shows an example of the layer configuration of a cell culture chip of one embodiment.
- 1 shows an example of the layer configuration of a cell culture chip of one embodiment.
- FIG. 2 is a schematic diagram showing an example of cell culture using the cell culture chip of one embodiment.
- a first aspect of the present invention is a cell culture chip including a laminate having a channel structure inside.
- the laminate includes, in this order, a bottom plate substrate, a channel substrate in which channels are formed by laser processing, and a top plate substrate.
- the channel substrate contains a resin having a glass transition temperature of 37° C. or higher, an elastic modulus of 1 ⁇ 10 9 Pa or higher at 25° C., and an elastic modulus of 1 ⁇ 10 7 Pa or lower at 150° C. .
- FIG. 1 is a perspective view of a cell culture chip according to one embodiment.
- FIG. 2 is an exploded view of the cell culture chip 1 of FIG.
- FIG. 3 is a cross-sectional view of the cell culture chip 1 of FIG. 1 taken along line III-III.
- FIG. 4 is a cross-sectional view of the cell culture chip 1 of FIG. 1 taken along line IV-IV.
- the cell culture chip 1 is a laminate having a channel structure inside.
- a laminate of the cell culture chip 1 is composed of a bottom plate substrate L1, a first channel substrate L2, a porous membrane L3, a second channel substrate L4, a top plate substrate L5, and a cover substrate L6.
- the bottom plate substrate L1, the first channel substrate L2, the porous film L3, the second channel substrate L4, the top plate substrate L5, and the cover substrate L6 are laminated in this order.
- a first channel F2 is formed in the first channel substrate L2.
- a second channel F4 is formed in the second channel substrate L4.
- the cell culture chip 1 has a port P1 as a chemical solution introduction port to the first channel F2, a port P2 as a chemical solution discharge port from the first channel F2, a port P3 as a chemical solution introduction port to the second channel F4, A port P4 is provided as a chemical solution discharge port from the second flow path F4.
- the first flow path F2 includes a first central flow path F2a, a first introduction flow path F2b connecting the port P1 and the first central flow path F2a, and a first discharge connecting the port P2 and the first central flow path F2a. It is formed from the flow path F2c.
- the chemical solution introduced from the port P1 passes through the first introduction channel F2b, the first central channel F2a, and the first discharge channel F2c, and is discharged from the port P2.
- the second flow path F4 includes a second central flow path F4a, a second introduction flow path F4b connecting the port P3 and the second central flow path F4a, and a second discharge connecting the port P4 and the second central flow path F4a. It is formed from the flow path F4c.
- the chemical liquid introduced from the port P3 passes through the second introduction channel F4b, the second central channel F4a, and the second discharge channel F4c, and is discharged from the port P4.
- the first central flow path F2a and the second central flow path F4a are arranged so that at least part of the flow path overlaps with each other.
- a porous membrane M separates the first central flow path F2a and the second central flow path F4a.
- the first central channel F2a is a lower channel positioned below the porous membrane M.
- the second central flow channel F4a is an upper flow channel positioned above the porous membrane M. As shown in FIG.
- the channel widths of the first central channel F2a and the second central channel F4a can be appropriately set according to the purpose of the cell culture chip 1.
- Examples of the channel width include 1 ⁇ m to 2000 ⁇ m, 10 ⁇ m to 1500 ⁇ m, 50 ⁇ m to 1000 ⁇ m, or 100 ⁇ m to 500 ⁇ m.
- the cover substrate L6 has an opening W so that the first central flow path F2a and the second central flow path F4a can be observed.
- the channel substrates (first channel substrate L2, second channel substrate L4) have a glass transition temperature (hereinafter also referred to as “Tg”) of 37° C. or higher, and an elastic modulus at 25° C. is 1 ⁇ 10 9 Pa or more and the elastic modulus at 150° C. is 1 ⁇ 10 7 Pa or less (hereinafter referred to as “resin A”).
- Tg glass transition temperature
- resin A elastic modulus at 25° C. is 1 ⁇ 10 9 Pa or more and the elastic modulus at 150° C. is 1 ⁇ 10 7 Pa or less
- a channel is formed in the channel substrate by laser processing.
- the channel substrate forms partition walls of the channels.
- Resin (A) has a Tg of 37° C. or higher, an elastic modulus of 1 ⁇ 10 9 Pa or higher at 25° C., and an elastic modulus of 1 ⁇ 10 7 Pa or lower at 150° C.
- Glass transition temperature (Tg) is the temperature at which the glass transition occurs. Tg can be determined as the temperature at which tangent lines intersect at the inflection point of the measured temperature obtained by differential scanning calorimetry (DSC) at a heating rate of 20° C./min.
- Elastic modulus is a complex elastic modulus measured using a dynamic viscoelasticity measuring device. Specifically, the elastic modulus can be obtained by preparing a resin sheet as a test piece having a size of 5 mm ⁇ 40 mm and measuring the dynamic elastic modulus of the test piece using a dynamic viscoelasticity measuring device. .
- a tension condition with a frequency of 1 Hz and a temperature increase rate of 2° C./min from a starting temperature of 25° C. to 150° C. may be adopted.
- the dynamic viscoelasticity measuring device for example, Rheogel-E4000 (manufactured by UBM) can be used.
- the elastic modulus at 25°C is the complex elastic modulus at 25°C measured with a dynamic viscoelasticity measuring device.
- the elastic modulus at 150°C is the complex elastic modulus at 150°C measured with a dynamic viscoelasticity measuring device.
- the resin (A) has a Tg of 37°C or higher.
- the lower limit of the Tg of the resin (A) is preferably 40°C or higher, more preferably 45°C or higher, still more preferably 50°C or higher, and particularly preferably 55°C or higher, 60°C or higher, or 65°C or higher.
- the upper limit of the Tg of the resin (A) is not particularly limited, but is preferably 110° C. or lower, more preferably 100° C. or lower, even more preferably 95° C. or lower, and particularly preferably 90° C. or lower, or 85° C. or lower.
- the Tg of resin (A) is preferably 40 to 110°C, more preferably 45 to 100°C, still more preferably 50 to 95°C, and particularly preferably 55 to 90°C, 60 to 90°C, or 65 to 85°C.
- the Tg of the resin (A) is within the above range, the sorption of the drug to the channel partition walls is suppressed.
- the resin (A) has an elastic modulus of 1 ⁇ 10 9 Pa or more at 25°C.
- the elastic modulus of the resin (A) at 25° C. is preferably 1.5 ⁇ 10 9 Pa or more.
- the upper limit of the elastic modulus of the resin (A) at 25° C. is not particularly limited, but is preferably 1 ⁇ 10 12 Pa or less, preferably 1 ⁇ 10 11 Pa or less, more preferably 5 ⁇ 10 10 Pa or less, 3 ⁇ 10 10 Pa or less is more preferable, and 2 ⁇ 10 10 Pa or less is particularly preferable.
- the elastic modulus at 25° C. is within the above range, the rigidity of the channel substrate is maintained.
- the resin (A) has an elastic modulus at 150° C. of 1 ⁇ 10 7 Pa or less.
- the elastic modulus of the resin (A) at 150° C. is preferably 8 ⁇ 10 6 Pa or less, more preferably 5 ⁇ 10 6 Pa or less.
- the lower limit of the elastic modulus of the resin (A) at 150° C. is not particularly limited, but is preferably 1 ⁇ 10 2 Pa or more, more preferably 1 ⁇ 10 3 Pa or more, and even more preferably 1 ⁇ 10 4 Pa or more. , 1 ⁇ 10 5 Pa or more is more preferable, and 1 ⁇ 10 6 Pa or more is particularly preferable.
- ⁇ 10 2 Pa or more and 1 ⁇ 10 7 Pa or less is preferably 1 ⁇ 10 2 Pa or more and 1 ⁇ 10 7 Pa or less, more preferably 1 ⁇ 10 3 Pa or more and 1 ⁇ 10 7 Pa or less, and 1 ⁇ 10 4 Pa or more.
- ⁇ 10 7 Pa or less is more preferable, and 1 ⁇ 10 5 Pa or more and 1 ⁇ 10 7 Pa or less is particularly preferable.
- the resin (A) examples include polyester-based resins, acrylic resins, cycloolefin copolymer-based resins, urethane-based resins, polyolefin-based resins, fluorine-based resins, silicone-based resins, or mixtures or modified resins of these resins. mentioned. Among them, polyester-based resins, acrylic-based resins, and cycloolefin copolymer-based resins are preferable as the resin (A).
- Polyester resin refers to a resin containing an ester bond (-CO-O-) in its main chain. Polyester resins include polyester resins and polyester urethane resins.
- a polyester resin can be obtained by copolymerizing a polyvalent carboxylic acid and a polyol.
- Examples of commercially available polyester resins as the resin (A) include G7 (Tg: 80° C., modulus at 25° C.: 1.84 ⁇ 10 9 Pa, modulus at 150° C.: 3.0%) manufactured by Kurashiki Boseki Co., Ltd.; 00 ⁇ 10 5 Pa), TP220 manufactured by Mitsubishi Chemical Corporation (Tg: 70° C., elastic modulus at 25° C.: 1.99 ⁇ 10 9 Pa, elastic modulus at 150° C.: 2.74 ⁇ 10 3 Pa), TP235 ( Tg: elastic modulus at 65°C and 25°C: 2.38 ⁇ 10 9 Pa, elastic modulus at 150°C: 1.42 ⁇ 10 4 Pa), TP236 (Tg: elastic modulus at 60°C and 25°C: 2.06 ⁇ 10 9 Pa, elastic modulus at 150°C: 6.22 ⁇ 10 4 Pa).
- the number average molecular weight (Mn) of the polyester resin as the resin (A) is, for example, 5,000 to 100,000.
- the number average molecular weight (Mn) is determined from polystyrene conversion standards by gel permeation chromatography (GPC).
- Acrylic resins are polymers of acrylic acid esters or methacrylic acid esters. Acrylic resins can be obtained by polymerizing acrylic acid esters or methacrylic acid esters.
- resin (A) polymethyl methacrylate (PMMA) is exemplified as an acrylic resin.
- PMMA polymethyl methacrylate
- Commercially available products of PMMA include, for example, Acrylite TM EX manufactured by Mitsubishi Chemical Corporation (Tg: 70°C, modulus of elasticity at 25°C: 3.04 ⁇ 10 9 Pa, modulus of elasticity at 150°C: 3.51 ⁇ 10 6 Pa).
- the number average molecular weight (Mn) of the acrylic resin as the resin (A) is, for example, 5,000 to 200,000.
- a cycloolefin copolymer resin is a copolymer of a cycloolefin and any monomer.
- a cycloolefin copolymer resin can be obtained by copolymerizing a cycloolefin and an arbitrary monomer.
- Examples of commercially available cycloolefin copolymer resins as the resin (A) include APL6509T manufactured by Mitsui Chemicals, Inc. (Tg: 80°C, modulus at 25°C: 1.86 ⁇ 10 10 Pa, modulus at 150°C : 1.71 ⁇ 10 6 Pa).
- the number average molecular weight (Mn) of the cycloolefin copolymer resin as the resin (A) is, for example, 5,000 to 150,000.
- the resin (A) may be used alone or in combination of two or more.
- the channel substrate When the channel substrate has a multilayer structure, the channel substrate preferably has at least one layer containing the resin (A) (hereinafter also referred to as "A layer").
- the content of the resin (A) in the A layer is preferably 70% by mass or more, more preferably 80% by mass or more, and 90% by mass or more with respect to the total mass (100% by mass) of the resin contained in the A layer. is more preferable, and 95% by mass or more is particularly preferable.
- the content of the resin (A) in the A layer may be 100% by mass with respect to the total mass (100% by mass) of the resin contained in the A layer.
- the A layer may contain a resin other than resin (A).
- the A layer may optionally contain additives such as solvents (eg, cyclohexanone, propylene glycol-1-methyl ether acetate (PGMEA), etc.), surfactants, antifoaming agents, and the like.
- the thickness of the A layer is not particularly limited as long as each member of the flow path substrate can be adhered.
- the lower limit of the thickness of the layer A is, for example, 50 ⁇ m or more, 100 ⁇ m or more, 150 ⁇ m or more, 200 ⁇ m or more, 250 ⁇ m or more, 300 ⁇ m or more, 350 ⁇ m or more, 400 ⁇ m or more, 450 ⁇ m or more, or 500 ⁇ m or more.
- Examples of the upper limit of the thickness of the A layer include 2000 ⁇ m or less, 1500 ⁇ m or less, 1000 ⁇ m or less, 900 ⁇ m or less, 800 ⁇ m or less, 750 ⁇ m or less, 700 ⁇ m or less, or 650 ⁇ m or less.
- the thickness range of the layer A is, for example, 50 ⁇ m to 2000 ⁇ m, 100 ⁇ m to 1500 ⁇ m, 150 ⁇ m to 1000 ⁇ m, 200 ⁇ m to 900 ⁇ m, 250 ⁇ m to 800 ⁇ m, 300 ⁇ m to 750 ⁇ m, 350 ⁇ m to 700 ⁇ m, 400 ⁇ m to 650 ⁇ m, or 450 ⁇ m to 650 ⁇ m. mentioned.
- the exemplified thickness is the thickness of one layer of the A layer.
- the channel substrate should include one or more layers A.
- the number of A layers included in the channel substrate may be 1 to 5, 1 to 4, 1 to 3, 1 to 2, or the like.
- the ratio (Ra) of the total thickness (ta) of the A layer to the total thickness (T1) of the channel substrate is preferably 50% or more, more preferably 60% or more, and 70%. It is more preferably 80% or more, and particularly preferably 80% or more.
- the upper limit of the ratio (Ra) is not particularly limited, and may be 100%.
- the ratio is preferably 95% or less, more preferably 90% or less, even more preferably 85% or less. Examples of the range of the ratio include 50 to 100%, 60 to 95%, 65 to 90%, 70 to 90%, or 75 to 85%.
- the ratio (Ra) is obtained by the following formula (1).
- Ra (%) ta/T1 x 100 (1)
- the channel substrate may include other layers in addition to the A layer.
- the other layer include a layer (hereinafter also referred to as "B layer”) containing a resin having a Tg of less than 37°C (hereinafter also referred to as "resin (B)").
- polyester resins having a Tg of less than 37°C examples include polyester resins having a Tg of less than 37°C.
- Polyester resins include polyester resins and polyester urethane resins.
- polyester resins having a Tg of less than 37°C examples include Vylon 300 (7°C), Vylon 630 (7°C), Vylon 650 (10°C), Vylon GK130 (15°C), and Vylon GK140 (20°C). , Byron GK150 (20°C), Byron GK190 (11°C), Byron GK330 (16°C), Byron GK590 (15°C), Byron GK680 (10°C), Byron GK780 (36°C), Byron GK890 (17°C), Byron 500 (4°C), Vylon 550 (-15°C), Vylon GK570 (0°C) (manufactured by Toyobo), Elitel UE-3510 (-25°C), Elitel UE-3400 (-20°C), Elitel UE ⁇ 3220 (5° C.), Elitel UE ⁇ 3220 (5° C.), Elitel UE-3500 (15° C.) (manufactured by Unitika Ltd.), G6 ( ⁇ 60° C.) (manufactured by
- the number average molecular weight (Mn) of the polyester resin as the resin (B) is, for example, 5,000 to 100,000.
- polyester urethane resins having a Tg of less than 37°C examples include Vylon UR-8300 (23°C), Vylon UR-3500 (10°C), and Vylon UR-6100 (-30°C). The numbers in parenthesis indicate the Tg.
- the number average molecular weight (Mn) of the polyester urethane resin as the resin (B) is, for example, 5,000 to 100,000.
- the polyester resin may be crosslinked with a melamine resin or the like.
- melamine resin examples include the "Sumimar (registered trademark) UR” series manufactured by Sumitomo Chemical Co., Ltd., and the “Cymel (registered trademark)” series manufactured by Mitsui Cytec.
- the ratio of the resin to the cross-linking agent is such that the cross-linking agent (after reaction) is 5% by mass or more and 30% by mass or less in the second adhesive layer after drying. It is preferable to mix so that
- the resin (B) may have an elastic modulus of 1 ⁇ 10 7 Pa or less at 150° C.
- the elastic modulus of the resin (B) at 150° C. may be, for example, 8 ⁇ 10 6 Pa or less, or 5 ⁇ 10 6 Pa or less.
- the lower limit of the elastic modulus of the resin (B) at 150° C. is not particularly limited, but is, for example, 1 ⁇ 10 2 Pa or more, 1 ⁇ 10 3 Pa or more, 1 ⁇ 10 4 Pa or more, 1 ⁇ 10 5 Pa or more, Alternatively, 1 ⁇ 10 6 Pa or more can be mentioned.
- the resin (B) may have an elastic modulus at 25° C. of 1 ⁇ 10 9 Pa or more, or 1.5 ⁇ 10 9 Pa or more.
- the upper limit of the elastic modulus of the resin (B) at 25° C. is not particularly limited, but is, for example, 1 ⁇ 10 12 Pa or less, 1 ⁇ 10 11 Pa or less, 5 ⁇ 10 10 Pa or less, 3 ⁇ 10 10 Pa or less, or 2 ⁇ 10 10 Pa or less.
- the elastic modulus of the resin (B) at 25° C. is 1 ⁇ 10 9 Pa or more and 1 ⁇ 10 12 Pa or less, 1 ⁇ 10 9 Pa or more and 1 ⁇ 10 11 Pa or less, 1 ⁇ 10 9 Pa or more and 5 ⁇ 10 10 Pa or less. , or 1 ⁇ 10 9 Pa or more and 3 ⁇ 10 10 Pa or less.
- the resin (B) may be a resin other than a polyester-based resin.
- examples thereof include acrylic resins, urethane resins, polyolefin resins, fluorine resins, silicone resins, and mixtures or modified resins of these resins.
- the resin (B) may be used alone or in combination of two or more.
- the content of the resin (B) in the B layer is preferably 70% by mass or more, more preferably 80% by mass or more, and 90% by mass or more with respect to the total mass (100% by mass) of the resin contained in the B layer. is more preferable, and 95% by mass or more is particularly preferable.
- the content of the resin (B) in the second adhesive may be 100% by mass with respect to the total mass (100% by mass) of the resins contained in the second adhesive.
- the B layer may contain resins other than resin (A) and resin (B).
- Layer B may optionally contain additives such as solvents (eg, cyclohexanone, propylene glycol-1-methyl ether acetate (PGMEA), etc.), surfactants, antifoaming agents, and the like.
- the thickness of the B layer is preferably 100 ⁇ m or less, more preferably 90 ⁇ m or less, even more preferably 80 ⁇ m or less, and particularly preferably 70 ⁇ m or less, or 60 ⁇ m or less.
- the lower limit of the thickness of the second adhesive layer include 1 ⁇ m or more, 3 ⁇ m or more, 5 ⁇ m or more, and 7 ⁇ m or more.
- the thickness range of the second adhesive layer include 1 ⁇ m to 100 ⁇ m, 3 ⁇ m to 90 ⁇ m, 5 ⁇ m to 80 ⁇ m, 5 ⁇ m to 70 ⁇ m, 5 ⁇ m to 60 ⁇ m, or 7 ⁇ m to 60 ⁇ m.
- the exemplified thickness is the thickness of one layer of the B layer. When the thickness of the layer B is within the preferred range, the reduction of the drug is easily suppressed.
- the ratio (Rb) of the total thickness (tb) of the B layer to the total thickness (T) of the cell culture chip is preferably 20% or less.
- the ratio (Rb) is preferably 19% or less, more preferably 18% or less, still more preferably 17% or less, and particularly preferably 16% or less, 15% or less, or 14% or less.
- the ratio of the thickness (tb) of the second adhesive layer is 0%.
- the ratio (Rb) is obtained by the following formula (1).
- Rb (%) tb/T x 100 (2)
- FIG. 5 shows a structural example of a laminate constituting a cell culture chip.
- a laminate 100 shown in FIG. 5 is composed of a bottom plate substrate L1, a first flow path substrate L2, a porous film L3, a second flow path substrate L4, a top plate substrate L5, and a cover substrate L6 in order from the bottom.
- A represents the A layer
- B represents the B layer.
- the bottom plate substrate L1 forms the bottom of the first flow path F2.
- the bottom plate substrate L1 is composed of the S1 layer.
- the material of the S1 layer is not particularly limited, but a material with high biocompatibility is preferable. Since cells may be observed with a phase-contrast microscope or the like while being cultured in the cell culture chip 1, the S1 layer is preferably made of a transparent material, and more preferably a material with low autofluorescence.
- the S1 layer preferably does not contain a filler (anti-blocking agent) in order to improve transparency.
- PET polyethylene terephthalate
- S1 layer polycarbonate
- cycloolefin polymer polydimethylsiloxane
- polystyrene polystyrene
- polyacrylate acrylic resin
- the S1 layer may have an easy-to-slip layer containing a lubricant component on at least one side.
- the slippery layer may contain a binder resin component.
- the lubricant component is not particularly limited, and examples thereof include paraffin wax, microwax, polypropylene wax, polyethylene wax, ethylene-acrylic wax, stearic acid, behenic acid, 12-hydroxystearic acid, stearic acid amide, and oleic acid amide.
- erucamide methylene bis stearamide, ethylene bis stearamide, ethylene bis oleamide, butyl stearate, monoglyceride stearate, pentaerythritol tetrastearate, hydrogenated castor oil, stearyl stearate, siloxane, higher alcohol Polymers, stearyl alcohol, calcium stearate, zinc stearate, magnesium stearate, lead stearate, silicone (dimethylsiloxane)-based low molecular weight substances (oils), silicone (dimethylsiloxane)-based resins, and the like.
- the lubricant component may be used alone or in combination of two or more.
- binder resin component blended in the slippery layer examples include polyester-based resins, polyamide-based resins, polyurethane-based resins, epoxy-based resins, phenol-based resins, acrylic-based resins, polyvinyl acetate-based resins, cellulose-based resins, Styrenic resins, copolymer resins thereof, and the like are included.
- a styrene-acrylic copolymer resin is preferred because it exhibits superior lubricity when combined with the lubricant component described above.
- Silicone-based refers to organosiloxanes. They are oily, rubbery, and resinous, and are called silicone oil, silicone rubber, and silicone resin, respectively. Since these have water-repellent action, lubricating action, release action, etc., they are effective in reducing surface friction by being contained in the outermost layer of the film.
- the thickness of the S1 layer is not particularly limited, but can be, for example, 50 ⁇ m to 300 ⁇ m.
- the thickness of the substrate S1 is, for example, 100 ⁇ m to 250 ⁇ m, or 150 ⁇ m to 200 ⁇ m.
- the first channel substrate L2 forms partition walls of the first channel F2.
- the first channel substrate L2 has a multilayer structure.
- the first flow path substrate L2 is composed of a laminate in which a B layer, an A layer, and a B layer are laminated in this order.
- the B layer functions as an adhesive layer.
- the thickness of the first channel substrate L2 defines the height (vertical width) of the first channel F2. Therefore, the thickness of the first channel substrate L2 can be appropriately set according to the desired height of the first channel F2.
- the thickness of the first channel substrate L2 may be appropriately adjusted by changing the thickness of the A layer, for example.
- the thickness of the first channel substrate L2 is, for example, 300 ⁇ m to 2000 ⁇ m. Examples of the thickness of the first channel substrate L2 include 300 ⁇ m to 2000 ⁇ m, 400 to 1800 ⁇ m, 500 ⁇ m to 1500 ⁇ m, 600 ⁇ m to 1200 ⁇ m, 600 ⁇ m to 1000 ⁇ m, 600 ⁇ m to 9000 ⁇ m, 600 ⁇ m to 800 ⁇ m, or 700 ⁇ m to 800 ⁇ m. .
- the porous membrane L3 partitions the first flow path F2 and the second flow path F4.
- the porous membrane L3 is composed of the porous membrane M.
- the porous membrane M is not particularly limited as long as it has a pore size through which the cells to be cultured do not pass but the drug solution can pass through.
- the average pore size of the porous membrane M is, for example, 0.05 ⁇ m to 10 ⁇ m.
- the pore density of the porous membrane M is, for example, about 10 5 to 10 9 /cm 2 .
- the porous membrane M is preferably made of a highly biocompatible material.
- materials for the porous membrane M include polycarbonate, polyester, polyethylene terephthalate, and polytetrafluoroethylene.
- the thickness of the porous membrane M is not particularly limited.
- the thickness of the porous membrane M is, for example, 0.1 ⁇ m to 100 ⁇ m, 0.5 ⁇ m to 50 ⁇ m, 1 ⁇ m to 30 ⁇ m, 5 ⁇ m to 20 ⁇ m, or 5 ⁇ m to 15 ⁇ m.
- the second channel substrate L4 forms partition walls of the second channel F4.
- the second channel substrate L4 has a multilayer structure.
- the layer structure of the second flow path substrate L4 is the same as that of the first flow path substrate L2. That is, the B layer, the A layer, and the B layer are laminated in this order. By providing the B layer on both sides of the A layer, it becomes easier to adhere to the porous membrane L3 and the second flow path substrate L4.
- the B layer functions as an adhesive layer.
- the thickness of the second channel substrate L4 defines the height (vertical width) of the second channel F4. Therefore, the thickness of the second flow path substrate L4 can be appropriately set according to the height of the target second flow path F4.
- the thickness of the second channel substrate L4 may be appropriately adjusted by changing the thickness of the A layer, for example.
- the thickness of the second channel substrate L4 is, for example, 300 ⁇ m to 2000 ⁇ m.
- Examples of the thickness of the first channel substrate L2 include 300 ⁇ m to 2000 ⁇ m, 400 ⁇ m to 1800 ⁇ m, 500 ⁇ m to 1500 ⁇ m, 600 ⁇ m to 1200 ⁇ m, 600 ⁇ m to 1000 ⁇ m, 600 ⁇ m to 9000 ⁇ m, 600 ⁇ m to 800 ⁇ m, or 700 ⁇ m to 800 ⁇ m. .
- the top substrate L5 forms the ceiling of the second flow path F4.
- the top substrate L5 is composed of the S1 layer.
- Examples of the S1 layer include those similar to the S1 layer in the bottom plate substrate L1.
- the thickness of the top board L5 is not particularly limited, but can be, for example, 50 to 600 ⁇ m.
- the thickness of the top substrate L5 is, for example, 100 ⁇ m to 500 ⁇ m, or 150 ⁇ m to 400 ⁇ m.
- the cover substrate L6 is provided on the uppermost layer of the cell culture chip.
- the cover substrate L6 is composed of a laminated body in which a B layer and an S2 layer are laminated in this order.
- the B layer functions as an adhesive layer.
- the S2 layer may be observed with a phase-contrast microscope or the like while cells are being cultured in the cell culture chip 1, a material having transparency is preferable, and a material with low autofluorescence is more preferable.
- the S2 layer preferably does not contain a filler (anti-blocking agent) in order to improve transparency.
- transparent low autofluorescent materials include glass, polyethylene terephthalate (PET), polycarbonate, cycloolefin polymer, polydimethylsiloxane, polystyrene, polyacrylate (acrylic resin), and polymethyl methacrylate (PMMA). Among them, PMMA is preferable as the material for the S2 layer.
- the thickness of the S2 layer is not particularly limited, but can be, for example, 500 ⁇ m to 5000 ⁇ m.
- the thickness of the S2 layer is, for example, 800 ⁇ m to 3000 ⁇ m, 1000 ⁇ m to 2500 ⁇ m, or 1500 ⁇ m to 2500 ⁇ m.
- the thickness of the cover substrate L6 is not particularly limited, but can be, for example, 500 ⁇ m to 5000 ⁇ m.
- the thickness of the substrate S2 is, for example, 800 ⁇ m to 3000 ⁇ m, 1000 ⁇ m to 2500 ⁇ m, or 1500 ⁇ m to 2500 ⁇ m.
- the plurality of S1 layers included in the laminate 100 may all be made of the same material, or may be partially made of different materials.
- the thicknesses of the multiple S1 layers may be the same or different.
- the plurality of A layers included in the laminate 100 may all be composed of layers having the same composition, or may be partially composed of layers having different compositions.
- the thicknesses of the multiple A layers may be the same or different.
- the plurality of B layers included in the laminate 100 may all be composed of layers having the same composition, or may be partially composed of layers having different compositions. The thicknesses of the multiple B layers may be the same or different.
- the number of A layers included in the first channel substrate L2 and the second channel substrate L4 can be changed as appropriate.
- the number of A layers may be, for example, one, two, four, or five. If the number of A layers increases, the number of B layers may increase accordingly. Some or all of the B layers may be omitted.
- further flow path substrates may be provided. It may also have a bottom plate substrate, a porous membrane, and a top plate substrate for additional channels.
- the B layer may have a multilayer structure. When the B layer has a multilayer structure, each layer constituting the B layer may contain different types of resin (B).
- the number of layers constituting the B layer is not particularly limited, but can be, for example, 2 to 5 layers, 2 to 4 layers, 2 to 3 layers, or 2 layers.
- some of the B layers may have a multi-layer structure, or all of them may have a multi-layer structure.
- FIG. 6 shows another structural example of the laminate constituting the cell culture chip.
- a laminate 200 shown in FIG. 6 is composed of a bottom plate substrate L1, a first channel substrate L2, a porous film L3, a second channel substrate L4, and a top plate L5 in order from the bottom.
- A is the A layer
- B is the B layer.
- the laminate 200 is a configuration example that does not have the cover substrate L6.
- the bottom plate substrate L1, the first channel substrate L2, the porous membrane L3, and the second channel substrate L4 are the same as those in the laminate 100.
- the top substrate L5 is composed of the S1 layer.
- the thickness of the top substrate L5 is not particularly limited, but examples thereof include 50 ⁇ m to 300 ⁇ m, 100 ⁇ m to 200 ⁇ m, or 150 ⁇ m to 200 ⁇ m.
- the relationships among the plurality of S1 layers, the plurality of A layers, and the plurality of B layers included in the laminate 200 are the same as those of the laminate 100 described above.
- the channel substrate has a glass transition temperature of 37° C. or higher, an elastic modulus of 1 ⁇ 10 9 Pa or higher at 25° C., and an elastic modulus of 1 at 150° C.
- the cell culture chip of this embodiment can be suitably used for cell culture in the presence of a drug, since the decrease of the drug when the drug solution is perfused or retained in the channel is suppressed.
- the cell culture chip of the present embodiment can be applied, for example, to drug evaluation tests (effectiveness evaluation tests, safety evaluation tests, etc.) using cells.
- a second aspect of the present invention is a cell culture device including the cell culture chip of the first aspect.
- a cell culture device comprises the cell culture chip of the first aspect and a mechanism for performing cell culture with the cell culture chip.
- the mechanism provided in the cell culture device can be changed as appropriate according to the purpose of cell culture.
- Mechanisms provided in the cell culture device include, for example, a liquid delivery mechanism (medical solution tank, liquid delivery tube, delivery pump, etc.) for supplying a chemical solution to the channel of the cell culture chip, Drainage mechanism (drainage tank, drainage tube, drainage pump, etc.) for discharging the chemical solution; temperature maintenance mechanism (thermostat, etc.) for maintaining the culture temperature of the cell culture chip, A cleaning mechanism for cleaning (a cleaning liquid tank, a tube, a pump, etc.) and the like are included.
- a liquid delivery mechanism medical solution tank, liquid delivery tube, delivery pump, etc.
- Drainage mechanism drainage tank, drainage tube, drainage pump, etc.
- temperature maintenance mechanism thermostat, etc.
- a cleaning mechanism for cleaning a cleaning liquid tank, a tube, a pump, etc.
- the cell culture device of this aspect includes the cell culture chip of the first aspect, it is possible to perform cell culture while suppressing the decrease of the drug in the drug solution. Therefore, it can be suitably used for cell culture in the presence of drugs.
- the cell culture device of this embodiment is applicable to, for example, drug evaluation tests (effectiveness evaluation tests, safety evaluation tests, etc.) using cells.
- a third aspect of the present invention is a method of manufacturing a cell culture chip including a laminate having a channel structure inside.
- the manufacturing method according to this aspect includes a step A of laminating a bottom plate substrate, a flow path substrate in which flow paths are formed by laser processing, and a top plate substrate in this order, and bonding the laminated substrates. and a step B of performing.
- the channel substrate contains a resin having a glass transition temperature of 37° C. or higher, an elastic modulus of 1 ⁇ 10 9 Pa or higher at 25° C., and an elastic modulus of 1 ⁇ 10 7 Pa or lower at 150° C. .
- Step A is a step of stacking a bottom plate substrate, a channel substrate having channels formed by laser processing, and a top plate substrate in this order.
- the flow path substrate may include a first flow path substrate L2 and a second flow path substrate L4.
- the cell culture chip may further include a porous membrane L3 and a cover substrate L6.
- Bottom plate substrate L1 As the bottom plate substrate L1, the same one as described above can be used.
- the bottom plate substrate L1 can be produced by processing the S1 layer into the size of the cell culture chip by laser processing or the like.
- laser processing for example, a carbon dioxide laser or the like can be used.
- the first channel substrate L2 preferably has a multilayer structure.
- each layer constituting the first flow path substrate L2 is produced, and the layers are laminated and pressed to obtain a laminate for the first flow path substrate L2.
- the pressure bonding of each layer can be performed using a laminator, a press machine, or the like. For example, after laminating each layer, they are pressure-bonded with a laminator and then pressed with a pressing machine, whereby the laminated body for the first flow path substrate L2 in which each layer is joined can be obtained.
- the laminate for the first channel substrate L2 can be processed into the size of a cell culture chip by laser processing. Furthermore, a flow path is formed by laser processing. For laser processing, for example, a carbon dioxide laser or the like can be used.
- porous membrane L3 As the porous membrane L3, the same one as described above can be used.
- the porous membrane L3 can be processed into the size of a cell culture chip by laser processing or the like. Furthermore, necessary processing such as formation of openings for ports P3 and P4 is performed by laser processing or the like.
- the second channel substrate L4 preferably has a multilayer structure.
- the second flow path substrate L4 can be produced by the same method as the first flow path substrate L2.
- the top plate substrate L5 can be the same one as described above.
- the top substrate L5 may have a multi-layer structure or a single-layer structure.
- a laminate for the top substrate L5 can be produced in the same manner as for the first channel substrate L2.
- the laminate for the top substrate L5 or the substrate for the top substrate L5 can be processed into the size of the cell culture chip by laser processing or the like.
- the top substrate L5 can be manufactured by performing necessary processing such as forming openings for the ports P1 to P4 by laser processing or the like.
- a cover substrate L6 similar to the above can be used.
- the cover substrate L6 can be processed into the size of a cell culture chip by laser processing or the like.
- the top substrate L5 can be manufactured by performing necessary processing such as forming openings for the ports P1 to P4 and the opening W by laser processing or the like.
- the members prepared as described above are laminated in order of the bottom plate substrate L1, the first channel substrate L2, the porous film L3, the second channel substrate L4, the top plate substrate L5, and the cover substrate L6.
- the members are laminated so that the positions of the openings for the ports P1 to P4 are aligned.
- the cover substrate L6 is not laminated.
- Step B is a step of joining the laminated substrates.
- each substrate can be performed using a laminator, press machine, or the like.
- a cell culture chip to which the substrates of the laminate are joined can be obtained by press-bonding the substrates of the laminate with a laminator and then pressurizing them with a pressing machine.
- the cell culture chip manufactured by the manufacturing method of the present embodiment is the cell culture chip according to the first aspect. Therefore, the production method according to this embodiment can be applied to the production of the cell culture chip according to the first aspect.
- a fourth aspect of the present invention is a method for culturing cells.
- a culture method according to this aspect includes a step of culturing cells in the presence of a drug in the channel of the cell culture chip of the first aspect.
- FIG. 7 is a schematic diagram showing an example of the culture state in this step.
- the first central flow path F2a and the second central flow path F4a are partitioned by the porous membrane L3.
- Cells C are cultured on the porous membrane L3 facing the second central flow path F4a.
- Cell C is not particularly limited, and any cell can be used.
- Animal cells can be used for the cells C.
- Animal cells include human cells and cells of animals other than humans (monkeys, mice, rats, guinea pigs, marmosets, dogs, cats, insects, etc.).
- the cell type is not particularly limited and can be appropriately selected depending on the purpose.
- Cells include, for example, immune cells, germ cells, nerve cells, fibroblasts, mesenchymal stem cells, hormone-secreting cells, various organ cells, cancer cells, various disease cells, pluripotent stem cells, etc. It is not limited to these.
- the drug may be a candidate drug to be developed as a therapeutic agent for any disease.
- examples of drugs include, but are not limited to, low-molecular-weight drugs (molecular weight of 500 or less), medium-molecular-weight drugs (molecular weight of about 500 to 2000), and high-molecular-weight drugs (nucleic acid drugs, protein drugs, polymers, etc.). .
- the medium used for culture is not particularly limited, and can be appropriately selected according to the cell type.
- the medium may be a basal medium for animal culture supplemented with a drug for evaluation and optionally necessary components.
- a known animal basal medium can be used.
- basal media include Doulbecco's modified Eagle's Medium (DMEM) medium, DMEM/F12 medium, IMDM medium, Medium 199 medium, Eagle's Minimum Essential Medium (EMEM) medium, ⁇ MEM medium, Ham's F12 medium, Examples include RPMI1640 medium, Fischer's medium, and mixed medium thereof.
- the basal medium may optionally contain serum (such as fetal bovine serum (FBS)) or serum replacement.
- FBS fetal bovine serum
- Serum replacements include, for example, albumin, transferrin, sodium selenite, ITS-X (Invitrogen), Knockout Serum Replacement (KSR), N2 supplement (Invitrogen), B27 supplement (Invitrogen), fatty acids, Insulin, collagen precursors, trace elements, 2-mercaptoethanol, 3′-thiolglycerol, etc.
- the basal medium optionally contains lipids, amino acids, L-glutamine, Glutamax, non-essential amino acids, vitamins, growth It may contain components such as factors, antibiotics, antioxidants, pyruvic acid, buffers, inorganic salts, etc. These can be used in combination as appropriate.
- the culture temperature can be, for example, 32-40°C, preferably 35-38°C (eg, 37°C).
- the CO 2 concentration can be, for example, about 2-5% (eg, 5%).
- a culture procedure can be performed, for example, as follows. First, the culture medium is injected from the port P1 and introduced into the first central flow path F2a. Next, the cell culture medium is injected from the port P3 to introduce the cell culture medium into the second central flow path F4a. The cell culture medium is retained in the second central flow path F4a and incubated for an arbitrary time to allow the cells to settle on the porous membrane L3. Next, a chemical solution is injected from the port P3 and introduced into the second central flow path F4a to perform cell culture. During cell settlement and culturing, the chemical solution may be perfused through the second flow path F4 or retained in the second flow path F4. The culture medium may be perfused through the first flow path F2 or retained in the first flow path F2 during the culture. By analyzing the state of cells during or after culturing, the effects of drugs on cells can be evaluated.
- the culture method of the present embodiment since culture is performed using the cell culture chip according to the first aspect, the sorption of the cell culture chip to the channel partition wall and/or the reduction of the drug due to adsorption is suppressed. can do. Therefore, the effects of drugs on cells can be accurately evaluated.
- a test piece for elastic modulus measurement (film thickness 50 ⁇ m, width 5 mm, length 40 mm) is cut out from the sample of each example above, and is subjected to tension conditions at a frequency of 1 Hz using Rheogel-E4000 (manufactured by UBM). The temperature was measured from 25° C. to 150° C. at a heating rate of 2° C./min. Table 2 shows the measurement results of the elastic modulus.
- the sample of each example was sterilized by immersing it in 70% ethanol for 30 minutes and air-dried in a clean bench.
- the laser-processed sample of Example 2 was sterilized by UV irradiation (30 minutes per side) in a clean bench.
- Samples were then placed in the wells of a 24-well plate and 550 ⁇ L of drug solution was introduced into the wells. Immediately after introduction into the wells, 50 ⁇ L was collected and mixed with 150 ⁇ L of diluting solvent for LC-MS/MS measurement to obtain a pre-incubation sample.
- the 24-well plate was then covered and placed in an incubator at 37°C.
- S1, A1, A2, B, and M in the layer structure are as follows.
- S1 COSMOSHINE A4160 (polyethylene terephthalate)
- B one or two resins (B) including Vylon 500 (polyester resin)
- A1 Clanbetter G7 (polyester resin)
- RA2 Acrylite TM EX (polymethyl methacrylate)
- M Polyethylene terephthalate porous membrane (average pore size 0.45 ⁇ m, track-etched membrane ipCELLCUTURE, manufactured by it4ip)
- a sheet for each layer of each member was produced and cut into a size of 200 mm x 150 mm. Sheets of each layer were laminated as shown in Table 4 to produce a laminate of each member.
- the laminated body of each member was passed through a laminating roll (laminator FA-570, manufactured by Taisei Laminator Co., Ltd.) set at 140° C. and thermocompression bonded (roll load 0.3 MPa, speed 0.1 to 0.5 m / min). .
- each layer of the laminate was adhered by pressing with a small press machine (H300-05, manufactured by AS ONE) at 105° C. and a load of 3 tons.
- the first flow path substrate L2 and the second flow path substrate L4 were formed by laser processing to form the first flow path F2 and the second flow path F4, respectively.
- Through holes for the ports P1 to P4 are formed in the top substrate L5.
- Through-holes for ports P1 and P2 were formed in the porous membrane L3.
- a bottom plate substrate L1, a first flow path substrate L2, a porous film L3, a second flow path substrate L4, and a top plate substrate L5 are stacked in this order so that the positions of the ports and flow paths are aligned, and a cell culture chip is obtained.
- a laminate for use was obtained.
- the laminate was passed through a laminating roll (laminator FA-570, manufactured by Taisei Laminator Co., Ltd.) set at 140° C. and thermocompression bonded (roll load 0.3 MPa, speed 0.1 to 0.5 m/min). Further, each layer of the laminate was adhered by pressing with a small press machine (H300-05, manufactured by AS ONE) at 50 to 80° C. and a load of 3 tons. Then, using LaserPro, it was cut into a size of 58 mm ⁇ 46 mm to obtain a chip for cell culture.
- the inside of the channel of the cell culture chip prepared above was washed with 9 mL of PBS. Then, it was sterilized by UV irradiation in a clean bench. UV irradiation was performed for 20 minutes on each side of the cell culture chip. Next, the inside of the channel was washed with 6 mL of PBS and air-dried in a clean bench. A chemical solution was introduced into the channels of the cell culture chip (the first channel F2 and the second channel F4) in an amount corresponding to the volume of the channels, and the cell culture chip was moved so that no air remained in the channels. was kept horizontal.
- 50 ⁇ L of the drug solution was recovered, mixed with 150 ⁇ L of a dilution solvent for LC-MS/MS measurement, and used as a sample after incubation for 0 hours.
- 50 ⁇ L of the drug solution was newly introduced into the channels (the first channel F2 and the second channel F4) of the cell culture chip and allowed to stand in an incubator at 37°C.
- 50 ⁇ L of the drug solution was collected and mixed with 150 ⁇ L of a dilution solvent for LC-MS/MS measurement to obtain a sample after incubation for 48 hours.
- Drug concentrations in the samples were quantified by LC-MS/MS.
- the drug residual rate of the sample after 48 hours of incubation was calculated as a relative value when the drug concentration of the sample after 0 hour of incubation was taken as 100%.
- the cell culture chip of the example can suppress the reduction of the drug compared to the cell culture chip of the comparative example.
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Abstract
Description
本願は、2021年8月26日に、日本に出願された特願2021-138142号に基づき優先権を主張し、その内容をここに援用する。
薬剤評価に用いられる細胞培養用チップとしては、ヒト体温に近い37℃付近の灌流条件で細胞培地の漏れがないこと、評価対象細胞の培養及び観察が可能であること、並びに薬剤の減少が少ないことが、等の条件が求められる。薬剤の減少が少ないという条件を満たすためには、薬液の灌流中に、流路を形成する隔壁等への薬剤の吸着を抑制する必要がある。しかしながら、レーザー加工により流路を形成すると、加工面にミクロの凹凸が発生する。この凹凸に薬剤が吸着されやすく、薬液中の薬剤減少の要因となっている。
本発明の第1の態様は、内部に流路構造を有する積層体を含む細胞培養用チップである。前記積層体は、底板基板と、レーザー加工により流路が形成された流路基板と、天板基板とをこの順で含む。前記流路基板は、ガラス転移温度が37℃以上であり、25℃における弾性率が1×109Pa以上であり、且つ150℃における弾性率が1×107Pa以下である、樹脂を含む。
第2流路F4は、第2中央流路F4a、ポートP3と第2中央流路F4aとを接続する第2導入流路F4b、ポートP4と第2中央流路F4aとを接続する第2排出流路F4cから形成される。ポートP3から導入された薬液は、第2導入流路F4b、第2中央流路F4a、及び第2排出流路F4cを経て、ポートP4から排出される。
細胞培養用チップにおいて、流路基板(第1流路基板L2、第2流路基板L4)は、ガラス転移温度(以下、「Tg」ともいう)が37℃以上であり、25℃における弾性率が1×109Pa以上であり、且つ150℃における弾性率が1×107Pa以下である、樹脂(以下、「樹脂A」という)を含む。流路基板には、レーザー加工により流路が形成されている。細胞培養用チップにおいて、流路基板は流路の隔壁を形成する。
樹脂(A)は、Tgが37℃以上であり、25℃における弾性率が1×109Pa以上であり、且つ150℃における弾性率が1×107Pa以下である。
本明細書において、「弾性率」は、動的粘弾性測定装置を用いて測定される複素弾性率である。具体的には、弾性率は、樹脂シートをサイズ5mm×40mmの試験片で作製し、動的粘弾性測定装置を用いて、前記試験片の動的弾性率を測定することにより得ることができる。測定条件は、周波数1Hzの引張条件において、開始温度25℃から150℃まで、昇温速度2℃/分で昇温する条件を採用すればよい。動的粘弾性測定装置としては、例えば、Rheogel-E4000(ユービーエム製)等を用いることができる。
25℃における弾性率は、動的粘弾性測定装置で測定される25℃における複素弾性率である。150℃における弾性率は、動的粘弾性測定装置で測定される150℃における複素弾性率である。
樹脂(A)としてのポリエステル樹脂の数平均分子量(Mn)としては、例えば、5,000~100,000が挙げられる。数平均分子量(Mn)は、ゲルパーミエーションクロマトグラフィー(GPC)によるポリスチレン換算基準から求められる。
樹脂(A)としてのアクリル系樹脂の数平均分子量(Mn)としては、例えば、5,000~200,000が挙げられる。
樹脂(A)としてのシクロオレフィンコポリマー系樹脂の数平均分子量(Mn)としては、例えば、5,000~150,000が挙げられる。
A層における樹脂(A)の含有量としては、A層が含有する樹脂の合計質量(100質量%)に対して、70質量%以上が好ましく、80質量%以上がより好ましく、90質量%以上がさらに好ましく、95質量%以上が特に好ましい。A層における樹脂(A)の含有量は、A層が含有する樹脂の合計質量(100質量%)に対して、100質量%であってもよい。
Ra(%)=ta/T1×100 (1)
流路基板が多層構造である場合、流路基板は、A層に加えて、他の層を含んでいてもよい。前記他の層としては、例えば、Tgが37℃未満である樹脂(以下、「樹脂(B)」ともいう)を含有する層(以下、「B層」ともいう)が挙げられる。流路基板がB層を含むことにより、他の部材との接着が行いやすくなる。
なお、樹脂と架橋剤との比率は、加工性等と耐久性とのバランスの観点から、乾燥後の第2接着剤層中に架橋剤(反応後)が5質量%以上30質量%以下となるように配合することが好ましい。
B層における樹脂(B)の含有量としては、B層が含有する樹脂の合計質量(100質量%)に対して、70質量%以上が好ましく、80質量%以上がより好ましく、90質量%以上がさらに好ましく、95質量%以上が特に好ましい。第2接着剤における樹脂(B)の含有量は、第2接着剤が含有する樹脂の合計質量(100質量%)に対して、100質量%であってもよい。
Rb(%)=tb/T×100 (2)
図5に、細胞培養用チップを構成する積層体の構成例を示す。
図5に示す積層体100は、下から順に、底板基板L1、第1流路基板L2、多孔膜L3、第2流路基板L4、天板基板L5、及びカバー基板L6から構成されている。図5中、Aは前記A層を表し、Bは前記B層を表す。
底板基板L1は、第1流路F2の底部を形成する。積層体100において、底板基板L1は、S1層により構成されている。S1層の材質は、特に限定されないが、生体適合性の高い材質が好ましい。細胞培養用チップ1で細胞を培養中に、位相差顕微鏡等により観察を行う場合があることから、S1層は、透明性を有する材質が好ましく、低自家蛍光の材質がより好ましい。S1層は、透明性を高めるために、フィラー(アンチブロッキング剤)を含まないことが好ましい。
透明な低自家蛍光の材質としては、例えば、ガラス、ポリエチレンテレフタレート(PET)、ポリカーボネート、シクロオレフィンポリマー、ポリジメチルシロキサン、ポリスチレン、ポリアクリレート(アクリル樹脂)等が挙げられる。中でも、S1層の材質としては、PETが好ましい。
滑剤成分としては、特別な限定はなく、例えば、パラフィンワックス、マイクロワックス、ポリプロピレンワックス、ポリエチレンワックス、エチレン-アクリル系ワックス、ステアリン酸、ベヘニン酸、12-ヒドロキシステアリン酸、ステアリン酸アミド、オレイン酸アミド、エルカ酸アミド、メチレンビスステアリン酸アミド、エチレンビスステアリン酸アミド、エチレンビスオレイン酸アミド、ステアリン酸ブチル、ステアリン酸モノグリセリド、ペンタエリスリトールテトラステアレート、硬化ヒマシ油、ステアリン酸ステアリル、シロキサン、高級アルコール系高分子、ステアリルアルコール、ステアリン酸カルシウム、ステアリン酸亜鉛、ステアリン酸マグネシウム、ステアリン酸鉛、シリコーン(ジメチルシロキサン)系の低分子量物(オイル)又はシリコーン(ジメチルシロキサン)系の樹脂などが挙げられる。滑剤成分は、単独で使用してもよく、2種以上を併用してもよい。
第1流路基板L2には、第1流路F2が形成されている。細胞培養用チップにおいて、第1流路基板L2は、第1流路F2の隔壁を形成する。積層体100において、第1流路基板L2は、多層構造を有している。
第1流路基板L2の厚さとしては、例えば、300μm~2000μmが挙げられる。第1流路基板L2の厚さとしては、例えば、300μm~2000μm、400~1800μm、500μm~1500μm、600μm~1200μm、600μm~1000μm、600μm~9000μm、600μm~800μm、又は700μm~800μm等が挙げられる。
多孔膜L3は、第1流路F2と第2流路F4とを仕切るものである。多孔膜L3は、多孔膜Mにより構成される。
多孔膜Mは、培養対象の細胞が通過せず、薬液が通過可能な孔径を有するものであれば、特に限定されない。多孔膜Mの平均ポアサイズとしては、例えば、0.05μm~10μmが挙げられる。多孔膜Mのポア密度としては、例えば、105~109個/cm2程度が挙げられる。
第2流路基板L4には、第2流路F4が形成されている。細胞培養用チップにおいて、第2流路基板L4は、第2流路F4の隔壁を形成する。積層体100において、第2流路基板L4は、多層構造を有している。
第2流路基板L4の厚さとしては、例えば、300μm~2000μmが挙げられる。第1流路基板L2の厚さとしては、例えば、300μm~2000μm、400μm~1800μm、500μm~1500μm、600μm~1200μm、600μm~1000μm、600μm~9000μm、600μm~800μm、又は700μm~800μm等が挙げられる。
天板基板L5は、第2流路F4の天井を形成する。積層体100において、天板基板L5は、S1層で構成されている。S1層としては、上記底板基板L1におけるS1層と同様のものが挙げられる。
カバー基板L6は、細胞培養用チップの最上層に設けられている。積層体100において、カバー基板L6は、B層、及びS2層が、この順に積層された積層体から構成されている。B層は、接着剤層として機能する。
透明な低自家蛍光の材質としては、例えば、ガラス、ポリエチレンテレフタレート(PET)、ポリカーボネート、シクロオレフィンポリマー、ポリジメチルシロキサン、ポリスチレン、ポリアクリレート(アクリル樹脂)、ポリメチルメタクリレート(PMMA)等が挙げられる。中でも、S2層の材質としては、PMMAが好ましい。
積層体100が含む複数のA層は、全て同じ組成の層で構成されていてもよく、一部が異なる組成の層で構成されていてもよい。複数のA層の厚さは、互いに同じであってもよく、異なっていてもよい。
積層体100が含む複数のB層は、全て同じ組成の層で構成されていてもよく、一部が異なる組成の層で構成されていてもよい。複数のB層の厚さは、互いに同じであってもよく、異なっていてもよい。
第1流路基板L2及び第2流路基板L4が含むA層の数は、適宜変更することができる。A層の数は、例えば、1個、2個、4個、又は5個等であってもよい。A層の数が増えた場合、B層もそれに応じて増やしてもよい。
複数のB層は、一部又は全部をなくしてもよい。
第1流路基板L2、第2流路基板L4に加えて、さらなる流路基板を有してもよい。また、追加の流路用の底板基板、多孔膜、及び天板基板を有してもよい。
B層は、多層構造を有してもよい。B層が多層構造を有する場合、B層を構成する各層は、それぞれ異なる種類の樹脂(B)を含んでもよい。B層が多層構造を有する場合、B層を構成する層の数は、特に限定されないが、例えば、2~5層、2~4層、2~3層、又は2層とすることができる。複数のB層が存在する場合、複数のB層は、一部が多層構造であってもよく、全部が多層構造であってもよい。
図6に、細胞培養用チップを構成する積層体の他の構成例を示す。
図6に示す積層体200は、下から順に、底板基板L1、第1流路基板L2、多孔膜L3、第2流路基板L4、及び天板基板L5から構成されている。図6中、Aは前記A層であり、Bは前記B層である。
積層体200において、天板基板L5の厚さは、特に限定されないが、例えば、50μm~300μm、100μm~200μm、又は150μm~200μm等が挙げられる。
本発明の第2の態様は、前記第1の態様の細胞培養用チップを含む、細胞培養用デバイスである。
本発明の第3の態様は、内部に流路構造を有する積層体を含む細胞培養用チップを製造する方法である。本態様にかかる製造方法は、底板基板と、レーザー加工により流路が形成された流路基板と、天板基板とを、この順で積層する工程Aと、前記の積層された各基板を接合する工程Bと、を含む。前記流路基板は、ガラス転移温度が37℃以上であり、25℃における弾性率が1×109Pa以上であり、且つ150℃における弾性率が1×107Pa以下である、樹脂を含む。
工程Aは、底板基板と、レーザー加工により流路が形成された流路基板と、天板基板とを、この順で積層する工程である。
底板基板L1は、上記と同様のものを用いることができる。底板基板L1は、S1層をレーザー加工等により、細胞培養用チップのサイズに加工することで作製することができる。レーザー加工には、例えば、炭酸ガスレーザー等を用いることができる。
第1流路基板L2は、上記と同様のものを用いることができる。第1流路基板L2は、多層構造を有することが好ましい。第1流路基板L2が多層構造を有する場合、第1流路基板L2を構成する各層を作製し、前記各層を積層して圧着することで、第1流路基板L2用の積層体を得ることができる。各層の圧着は、ラミネーター、及びプレス機等を用いて行うことができる。例えば、各層を積層後、ラミネーターで圧着した後、プレス機で加圧することにより、各層が接合された第1流路基板L2用積層体を得ることができる。
多孔膜L3は、上記と同様のものを用いることができる。多孔膜L3は、レーザー加工等により、細胞培養用チップのサイズに加工することができる。さらに、レーザー加工等により、ポートP3、及びポートP4用の開口の形成す等の必要な加工を行う。
第2流路基板L4は、上記と同様のものを用いることができる。第2流路基板L4は、多層構造を有することが好ましい。第2流路基板L4は、第1流路基板L2と同様の方法で作製することができる。
天板基板L5は、上記と同様のものを用いることができる。天板基板L5は、多層構造を有してもよいし、単層構造であってもよい。天板基板L5が多層構造を有する場合、第1流路基板L2と同様の方法で、天板基板L5用積層体を作製することができる。
天板基板L5用積層体又は天板基板L5用基板は、レーザー加工等により、細胞培養用チップのサイズに加工することができる。さらに、レーザー加工等により、ポートP1~P4用の開口の形成す等の必要な加工を行うことにより、天板基板L5を作製することができる。
カバー基板L6は、上記と同様のものを用いることができる。カバー基板L6は、レーザー加工等により、細胞培養用チップのサイズに加工することができる。さらに、レーザー加工等により、ポートP1~P4用の開口、開口部Wの形成等の必要な加工を行うことにより、天板基板L5を作製することができる。
工程Bは、積層された各基板を接合する工程である。
本発明の第4の態様は、細胞の培養方法である。本態様にかかる培養方法は、前記第1の態様の細胞培養用チップの流路内で、薬剤の存在下で細胞を培養する工程を含む。
図7は、本工程における培養状態の一例を示す模式図である。細胞培養用チップ1において、第1中央流路F2a及び第2中央流路F4aは、多孔膜L3で仕切られている。細胞Cは、第2中央流路F4aに面する多孔膜L3上で培養されている。
細胞の種類は、特に限定されず、目的に応じて適宜選択することができる。細胞としては、例えば、免疫細胞、生殖細胞、神経細胞、線維芽細胞、間葉系幹細胞、ホルモン分泌細胞、各種臓器細胞、がん細胞、各種疾患細胞、多能性幹細胞等が挙げられるが、これらに限定されない。
基礎培地としては、例えば、Doulbecco’s modified Eagle’s Medium(DMEM)培地、DMEM/F12培地、IMDM培地、Medium199培地、Eagle’sMinimum Essential Medium(EMEM)培地、αMEM培地、Ham’s F12培地、RPMI1640培地、Fischer’s培地、及びこれらの混合培地等が挙げられる。
基礎培地は、必要に応じて、血清(牛胎児血清(FBS)など)、又は血清代替物を含んでいてもよい。血清代替物としては、例えば、アルブミン、トランスフェリン、亜セレン酸ナトリウム、ITS-X(Invitrogen)、ノックアウト血清代替物(Knockout Serum Replacement(KSR)、N2サプリメント(Invitrogen)、B27サプリメント(Invitrogen)、脂肪酸、インスリン、コラーゲン前駆体、微量元素、2-メルカプトエタノール、3’-チオールグリセロール等が挙げられる。基礎培地は、必要に応じて、脂質、アミノ酸、L-グルタミン、Glutamax、非必須アミノ酸、ビタミン、増殖因子、抗生物質、抗酸化剤、ピルビン酸、緩衝剤、無機塩類等の成分を含んでいてもよい。これらは、適宜組み合わせて用いることができる。
まず、ポートP1から培地を注入し、第1中央流路F2aに培地を導入する。次に、ポートP3から細胞培養液を注入し、第2中央流路F4aに細胞培養液を導入する。第2中央流路F4a内に、細胞培養液を滞留させた状態で、任意の時間インキュベートし、多孔膜L3に、細胞を定着させる。次に、ポートP3から薬液を注入し、第2中央流路F4aに薬液を導入し、細胞培養を行う。細胞定着中、及び培養中、薬液は、第2流路F4を灌流させてもよく、第2流路F4内に滞留させてもよい。培養中、培地は、第1流路F2を灌流させてもよく、第1流路F2内に滞留させてもよい。
培養中又は培養後の細胞の状態を解析することで、細胞に対する薬剤の影響を評価することができる。
<レーザー加工サンプルの作製>
表1に示す各例のサンプルをレーザー加工により切り出し、レーザー加工用サンプルを作製した。サンプルのレーザー加工には、LaserPro(炭酸ガスレーザー、GCC社製)を用いた。レーザーの出力及び速度は、各サンプルの材質に合わせて調整した。
上記各例のサンプルから弾性率測定用の試験片(膜厚50μm、幅5mm、長さ40mm)を切り出し、Rheogel-E4000(ユービーエム製)を使用して、周波数1Hzの引張条件において、開始温度25℃から150℃まで、昇温速度2℃/分で昇温する条件により測定した。弾性率の測定結果を表2に示した。
PHN:フェナセチン
DIC:ジクロフェナク
MEP:(S)-メフェニトイン
BUF:ブフラロール
MDZ:ミダゾラム
前記サンプル中の薬剤濃度を、LC-MS/MS(EXION AD-QTRAP6500+、SCIEX社製)で定量した。インキュベーション前サンプルの薬剤濃度を100%としたときの相対値として、48時間インキュベーション後サンプルの薬剤残存率を算出し、「薬剤残存率」として表3に示した。
参考例1及び参考例2は、レーザー未加工サンプルであるが、一部の薬剤で薬剤残存率が低かった。
<細胞培養用チップの作製>
下記の層構成を有する各例の細胞培養用チップを作製した。括弧内は厚さ(μm)を示す。各部材中の樹脂層は、下層から順に記載した。
S1:コスモシャインA4160(ポリエチレンテレフタレート)
B:バイロン500(ポリエステル樹脂)を含む1種又は2種の樹脂(B)
A1:クランベターG7(ポリエステル樹脂)
RA2:アクリライトTM EX(ポリメチルメタクリレート)
M:ポリエチレンテレフタレート製多孔膜(平均ポアサイズ0.45μm、トラックエッチドメンブレンipCELLCUTURE、it4ip社製)
次いで、LaserProを用いて、58mm×46mmの大きさにカットし、細胞培養用チップを得た。
上記で作製した細胞培養用チップを用いて、以下に示す薬剤の減少試験を行った。
PHN:フェナセチン
DIC:ジクロフェナク
MEP:(S)-メフェニトイン
MDZ:ミダゾラム
細胞培養用チップの流路(第1流路F2、第2流路F4)に、流路の体積に合わせた量の薬液を導入し、流路内に空気が残存しないように細胞培養用チップを水平に維持した。薬液の導入直後に薬液50μLを回収し、150μLのLC-MS/MS測定用希釈溶媒と混合して、0時間インキュベーション後サンプルとした。
細胞培養用チップの流路(第1流路F2、第2流路F4)に、新たに50μLの薬液を導入し、37℃のインキュベータ内で静置した。薬液導入の48時間後に、50μLの薬液を回収し、150μLのLC-MS/MS測定用希釈溶媒と混合して、48時間インキュベーション後のサンプルとした。
前記サンプル中の薬剤濃度を、LC-MS/MSで定量した。0時間インキュベーション後サンプルの薬剤濃度を100%としたときの相対値として、48時間インキュベーション後サンプルの薬剤残存率を算出し、「薬剤残存率」として表5に示した。
L2 第1流路基板
L3 多孔膜
L4 第2流路基板
L5 天板基板
L6 カバー基板
P1~P4 ポート
F2 第1流路
F4 第2流路
W 開口部
Claims (7)
- 内部に流路構造を有する積層体を含む細胞培養用チップであって、
前記積層体が、底板基板と、レーザー加工により流路が形成された流路基板と、天板基板とをこの順で含み、
前記流路基板が、ガラス転移温度が37℃以上であり、25℃における弾性率が1×109Pa以上であり、且つ150℃における弾性率が1×107Pa以下である、樹脂を含む、
細胞培養用チップ。 - 前記流路基板は、第1流路が形成された第1流路基板と、第2流路が形成された第2流路基板とを含み、
前記積層体は、前記第1流路基板と前記第2流路基板との間に、多孔膜をさらに含む、
請求項1に記載の細胞培養用チップ。 - 前記第1流路基板及び前記第2流路基板からなる群より選択される少なくとも1つが、多層構造を有する、請求項2に記載の細胞培養用チップ。
- 請求項1~3のいずれか一項に記載の細胞培養用チップを含む、細胞培養用デバイス。
- 内部に流路構造を有する積層体を含む細胞培養用チップを製造する方法であって、
底板基板と、レーザー加工により流路が形成された流路基板と、天板基板とを、この順で積層する工程Aと、
前記の積層された各基板を接合する工程Bと、を含み、
前記流路基板が、ガラス転移温度が37℃以上であり、25℃における弾性率が1×109Pa以上であり、且つ150℃における弾性率が1×107Pa以下である、樹脂を含む、
細胞培養用チップの製造方法。 - 前記流路基板が、第1流路が形成された第1流路基板と、第2流路が形成された第2流路基板とを含み、
前記工程Aが、前記底板基板と、前記第1流路基板と、多孔膜と、前記天板基板とを、この順で、接着剤層を介して積層する工程である、
請求項5に記載の細胞培養用チップの製造方法。 - 請求項1~3のいずれか一項に記載の細胞培養用チップの前記流路内で、薬剤の存在下で細胞を培養する工程を含む、細胞の培養方法。
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