WO2015178427A1 - 中空マイクロファイバ - Google Patents
中空マイクロファイバ Download PDFInfo
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- WO2015178427A1 WO2015178427A1 PCT/JP2015/064524 JP2015064524W WO2015178427A1 WO 2015178427 A1 WO2015178427 A1 WO 2015178427A1 JP 2015064524 W JP2015064524 W JP 2015064524W WO 2015178427 A1 WO2015178427 A1 WO 2015178427A1
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- cell
- microfiber
- hydrogel
- preparation solution
- layer
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M25/00—Means for supporting, enclosing or fixing the microorganisms, e.g. immunocoatings
- C12M25/10—Hollow fibers or tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
- B01D69/081—Hollow fibre membranes characterised by the fibre diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
- B01D69/085—Details relating to the spinneret
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/1212—Coextruded layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/14—Dynamic membranes
- B01D69/141—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes
- B01D69/142—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes with "carriers"
- B01D69/144—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes with "carriers" containing embedded or bound biomolecules
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M25/00—Means for supporting, enclosing or fixing the microorganisms, e.g. immunocoatings
- C12M25/10—Hollow fibers or tubes
- C12M25/12—Hollow fibers or tubes the culture medium flowing outside the fiber or tube
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/08—Thickening liquid suspensions by filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/42—Details of membrane preparation apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/08—Polysaccharides
Definitions
- the present invention relates to a hollow microfiber including a cell layer, a manufacturing method of the microfiber, and a kit for performing the manufacturing method.
- the core unit (core part) in which cells are mixed with collagen and fibrin, which are extracellular matrix components, and the outer shell part (shell part) such as alginate gel, can be a basic unit for forming a three-dimensional cellular tissue.
- the microfiber having a core / shell structure coated with Patent Document 1.
- the microfiber has sufficient mechanical strength for handling, and can build a three-dimensional cellular tissue while maintaining the function of the cell.
- the microfiber can be manufactured using various types of cells including nerve cells, muscle cells, fibroblasts, and epithelial cells.
- Non-patent document 1 it is known that when vascular endothelial cells are introduced into the core portion of the above-described microfiber together with the extracellular matrix component and cultured, the vascular endothelial cells spontaneously form a lumen in the microfiber.
- an object of the present invention is to provide a microfiber that can be fed with a sufficient length and in which a continuous lumen structure is formed by a cell layer.
- the present inventors have obtained a tubular cell adhesive layer containing a cell adhesive hydrogel and an outer shell layer containing a high-strength hydrogel covering the outer periphery of the cell adhesive layer. It is found that a continuous cell layer covering the inner periphery of the cell adhesive layer can be formed by passing a cell suspension through the hollow portion of the microfiber and then culturing the cell, and the present invention provides It came.
- this invention has the following aspects.
- the cell adhesive hydrogel is selected from the group consisting of chitosan gel, collagen gel, gelatin, peptide gel, laminin gel and fibrin gel, and mixtures thereof.
- the cell suspension is prepared by suspending cells in a liquid selected from the group consisting of polyethylene glycol, glycerol, alginate and dextran, and mixtures thereof.
- [12] (1) at least one cell adhesive layer comprising a cell adhesive hydrogel, (2) Outer shell layer containing a high-strength hydrogel covering the outer periphery of the cell adhesive layer located at the most distal portion from the central axis among the at least one cell adhesive layer, (3) Among the at least one cell adhesive layer, a cell layer covering the inner periphery of the cell adhesive layer located at the most proximal portion from the central axis, and (4) a cell suspension that fills the hollow portion,
- a method of manufacturing a microfiber comprising the following steps: (I) forming a laminar flow of cell suspension; (Ii) forming at least one laminar flow of the cell-adhesive hydrogel preparation solution covering the outer periphery of the laminar flow of the cell suspension; (Iii) A high-strength hydrogel that covers the outer periphery of the
- Cell suspension introduction tube At least one cell-adhesive hydrogel preparation tube that is coaxial with the cell suspension tube; A high-strength hydrogel preparation solution introduction tube that is coaxial with the cell suspension introduction tube and the at least one cell adhesion hydrogel preparation solution introduction tube;
- a microfluidic device comprising a gelling region of a solution for preparing a high-strength hydrogel and a gelling region of a solution for preparing a cell adhesive hydrogel, (1) at least one cell adhesive layer comprising a cell adhesive hydrogel, (2) Outer shell layer containing a high-strength hydrogel covering the outer periphery of the cell adhesive layer located at the most distal portion from the central axis among the at least one cell adhesive layer, (3) Among the at least one cell adhesive layer, a cell layer covering the inner periphery of the cell adhesive layer located at the most proximal portion from the central axis, and (4) a cell suspension that fills the hollow portion,
- the high-strength hydrogel preparation solution is injected from the high-strength hydrogel preparation solution introduction tube, and the farthest from the central axis in the laminar flow of the at least one cell-adhesive hydrogel preparation solution Forming a laminar flow of the high strength hydrogel preparation solution covering the outer periphery of the laminar flow of the cell adhesion hydrogel preparation solution located at the position;
- the assembly of laminar flows formed in (i) to (iii) is passed through the gelation region of the high-strength hydrogel preparation solution to gel the high-strength hydrogel preparation solution, Forming an outer shell layer containing hydrogel;
- the assembly of laminar flows formed in (i) to (iii) is passed through the gelation region of the cell-adhesive hydrogel preparation solution to gel the cell-adhesive hydrogel preparation solution, Forming a cell adhesion
- the cell suspension is prepared by suspending cells in a liquid selected from the group consisting of polyethylene glycol, glycerol, alginate and dextran, and mixtures thereof.
- Manufacturing method of microfiber [15] The microfiber according to any one of [12] to [14], wherein the cell density in the cell suspension is 1.0 ⁇ 10 6 cells / mL to 1.0 ⁇ 10 8 cells / mL. Manufacturing method. [16] The method for producing a microfiber according to any one of [12] to [15], wherein the cell-adhesive hydrogel preparation solution and the high-strength hydrogel preparation solution are gelated under different conditions.
- the cell adhesive hydrogel is selected from the group consisting of chitosan gel, collagen gel, gelatin, peptide gel, laminin gel or fibrin gel, or a mixture thereof.
- Microfiber manufacturing method [18] The method for producing a microfiber according to any one of [12] to [17], wherein the high-strength hydrogel is an alginate gel or an agarose gel. [19] The method for producing a microfiber according to any one of [12] to [18], wherein the cell adhesive hydrogel is a collagen gel, and the high-strength hydrogel is an alginate gel. [20] [12] A microfiber manufactured by the method according to any one of [19].
- [22] (1) at least one cell adhesive layer comprising a cell adhesive hydrogel, (2) Out of the at least one cell adhesive layer, an outer shell layer containing a high-strength hydrogel covering the outer periphery of the cell adhesive layer located at the most distal portion from the central axis; and (3) the at least one A method for producing a hollow microfiber, comprising a cell layer covering an inner periphery of a cell adhesive layer located at a position closest to a central axis among cell adhesive layers, wherein any one of [12] to [19] Removing the cell suspension from the microfiber produced by the method according to claim 1.
- a hollow microfiber obtainable by removing the outer shell layer from the hollow microfiber according to [23].
- a kit for carrying out the method for producing a microfiber according to any one of (I) a cell adhesive hydrogel preparation solution that is gelled to form a cell adhesive hydrogel; (Ii) a solution for preparing a high-strength hydrogel that is gelled to form a high-strength hydrogel; The kit comprising (iii) a cell suspension; and (iv) instructions for producing the microfiber.
- a microfiber that can be fed with a sufficient length and in which a continuous lumen structure is formed by a cell layer.
- the microfiber can function as a substitute for a lumen structure such as a blood vessel and a lymph vessel in a living body, and can be used in the field of regenerative medicine.
- the manufactured microfiber of the present invention can be incorporated into a three-dimensional tissue.
- a vascular network can be easily produced by incorporating the microfiber of the present invention produced using vascular endothelial cells into a three-dimensional tissue.
- Example 1 It is the figure which showed the mode of the microfiber manufactured according to Example 1 (a). It is the figure which showed a mode that the outer shell layer of the microfiber was removed with the alginate lyase according to Example 1 (b). The left part shows before removal of the outer shell layer, and the right part shows after removal of the outer shell layer. It is a figure which shows the microfiber manufactured by coculturing a vascular endothelial cell and a vascular smooth muscle cell according to Example 2. FIG. It is a figure which shows that the hollow part of the microfiber manufactured according to Example 1 can liquid-feed.
- One aspect of the present invention is (1) at least one cell adhesive layer containing a cell adhesive hydrogel, and (2) a cell located at the most distal portion from the central axis in the at least one cell adhesive layer.
- An outer shell layer containing a high-strength hydrogel covering the outer periphery of the adhesive layer, and (3) of the at least one cell adhesive layer, covering the inner periphery of the cell adhesive layer located at the most proximal portion from the central axis A hollow microfiber containing a cell layer.
- microfiber means, for example, a fibrous structure having an outer diameter of about 10 ⁇ m to 1 mm, but the outer diameter is not particularly limited to the above range.
- the cross-sectional shape in the direction perpendicular to the central axis may be various shapes such as a circle, an ellipsoid, or a polygon such as a quadrangle or a pentagon.
- the cross-sectional shape is preferably circular.
- “hollow microfiber” is a form of microfiber and has a hollow portion passing through the central axis.
- the cross-sectional shape of the hollow microfiber of the present invention is preferably circular.
- the diameter of the hollow portion is not particularly limited, but is preferably 5 ⁇ m to 500 ⁇ m, more preferably 5 ⁇ m to 400 ⁇ m, still more preferably 5 ⁇ m to 300 ⁇ m, and particularly preferably 5 ⁇ m to 200 ⁇ m.
- the inner diameter of the outer shell layer of the hollow microfiber of the present invention is not particularly limited, but is preferably 10 ⁇ m to 500 ⁇ m, more preferably 10 ⁇ m to 400 ⁇ m.
- the outer diameter of the outer shell layer of the hollow microfiber of the present invention is not particularly limited, but is preferably 20 ⁇ m to 500 ⁇ m.
- the hollow microfiber of the present invention has a hollow portion with a diameter of 5 ⁇ m to 200 ⁇ m, an outer shell layer with an inner diameter of 10 ⁇ m to 400 ⁇ m, and an outer shell layer with an outer diameter of 20 ⁇ m to 500 ⁇ m.
- the diameter of the hollow portion of the hollow microfiber and the inner diameter and outer diameter of the outer shell layer are, for example, measured values from an image obtained by a phase-contrast optical microscope, and are expressed as average values of measured values at several locations of the microfiber. Is done.
- the length of the hollow microfiber of the present invention is not particularly limited, but is preferably 1 mm to 100 cm, more preferably 5 mm to 20 cm.
- the cell adhesive layer constituting the hollow microfiber of the present invention contains a cell adhesive hydrogel as a base material.
- the cell-adhesive hydrogel is not particularly limited as long as cells can adhere to and cultured on the gel to form a cell layer and have sufficient permeability to cell culture medium components.
- the cell-adhesive hydrogel can be decomposed or remodeled by cells in the living body and replaced with living tissue in the long term.
- the cell-adhesive hydrogel is preferably a hydrogel that has been gelated by an external stimulus.
- the external stimulus is a stimulus under physiological conditions and / or a stimulus that does not exhibit cytotoxicity, for example, addition of metal ions (for example, calcium ions), enzyme addition, pH fluctuation, heating, UV irradiation, irradiation However, it is not limited to these.
- the cell adhesive hydrogel is preferably an extracellular matrix component.
- the cell adhesive hydrogel of the present invention is preferably selected from the group consisting of chitosan gel, collagen gel, gelatin, peptide gel, laminin gel and fibrin gel, and mixtures thereof.
- chitosan gel, collagen gel, gelatin, peptide gel and laminin gel are gelled by changing the temperature, pH and / or salt concentration, for example.
- Fibrin gel is gelated by the action of monomeric fibrinogen with the enzyme thrombin.
- an aqueous organic solvent having a property of mixing with water for example, ethanol, acetone, ethylene glycol, propylene glycol, glycerin, dimethylformamide, or dimethyl sulfoxide may be added.
- an appropriate component or solvent can be blended. From such a viewpoint, for example, dimethyl sulfoxide can be added as a solvent for the preparation of polyvinyl alcohol hydrogel.
- one or more biological components such as cells, proteins, lipids, saccharides, nucleic acids, or antibodies can be added to the cell adhesive layer.
- the type of cell is not particularly limited.
- pluripotent ES cells or iPS cells various pluripotent stem cells (hematopoietic stem cells, neural stem cells, mesenchymal stem cells, etc.), differentiation unity Stem cells (hepatic stem cells, reproductive stem cells, etc.), etc., as well as various differentiated cells, such as muscle cells such as skeletal muscle cells and cardiomyocytes, neurons such as cerebral cortex cells, fibroblasts, epithelial cells, hepatocytes, Examples thereof include pancreatic ⁇ cells and skin cells.
- the cell adhesive layer may include a cell culture obtained by culturing cells in the cell adhesive layer.
- the cells and biological components are not limited to those exemplified above.
- the origin of the said cell and biological component is not specifically limited, For example, it is derived from animal cells, such as a human, a mouse
- Various growth factors suitable for cell culture, cell maintenance and proliferation, or cell functional expression such as epidermal growth factor (EGF), platelet-derived growth factor (PDGF), transforming growth factor (TGF), Insulin-like growth factor (IGF), fibroblast growth factor (FGF), nerve growth factor (NGF), etc. may be added to the cell adhesive layer.
- a growth factor When a growth factor is used, an appropriate concentration can be selected according to the type of growth factor.
- a non-biological component may be added to the cell adhesive layer.
- fibers such as carbon nanofibers, inorganic substances such as catalyst substances, beads coated with antibodies, or artificial objects such as microchips can be added.
- the hollow microfiber of the present invention has at least one cell adhesive layer.
- Each cell adhesion layer exists in the state laminated
- the constituent components of each cell adhesive layer may be the same or different.
- the number of cell adhesion layers is not particularly limited, but is preferably 1 to 5 layers, and more preferably 1 to 3 layers. In one embodiment of the invention, the number of cell adhesion layers is one.
- the thickness of the cell adhesive layer is not particularly limited, but is preferably 10 ⁇ m to 250 ⁇ m.
- the cell adhesive layer usually has a substantially uniform thickness.
- the cell adhesive layer has a thickness uniformity in the range of ⁇ 5%.
- the thickness uniformity is calculated as a% variation value with respect to the average value of the measured values of the thickness of the cell adhesive layer at several positions of the microfiber, measured by a phase contrast optical microscope, for example.
- the outer shell layer constituting the hollow microfiber of the present invention contains a high-strength hydrogel as a base material.
- the high-strength hydrogel is not particularly limited as long as it is a hydrogel having a higher mechanical strength than the cell adhesive layer to be coated and can have sufficient permeability to cell culture medium components.
- the mechanical strength of the gel the tensile strength and load strength can be measured by a method using a tensile tester in water according to a method well known to those skilled in the art. Biological components and non-biological components can be added to the high-strength hydrogel as necessary.
- the high-strength hydrogel is preferably a hydrogel that has been gelled by an external stimulus.
- the external stimulus include, but are not limited to, addition of metal ions (for example, calcium ions), enzyme treatment, pH fluctuation, heating, UV irradiation, and radiation irradiation.
- the external stimulus for forming the high-strength hydrogel may be the same as or different from the external stimulus for forming the cell adhesive hydrogel. Preferably, each external stimulus is different.
- the high-strength hydrogel is preferably a hydrogel that can be removed from the microfiber by chemical reaction or enzymatic reaction after the formation of the microfiber of the present invention.
- the high-strength hydrogel is more preferably an alginate gel or an agarose gel.
- the alginate gel can be removed by gelation by adding calcium ions, and by removing calcium ions by an enzyme treatment using alginate lyase or the like, or by causing a chelating agent such as EDTA to act at an appropriate concentration.
- agarose gel is gelled by temperature and can be removed by enzyme treatment.
- the thickness of the outer shell layer is not particularly limited, but is preferably 5 ⁇ m to 250 ⁇ m.
- the outer shell layer usually has a substantially uniform thickness.
- the outer shell layer has a thickness uniformity in the range of ⁇ 5%.
- the thickness uniformity is calculated as a% variation value with respect to an average value of measured values of the thickness of the outer shell layer at several positions of the microfiber, which is measured by, for example, a phase contrast optical microscope.
- the cell adhesive layer may have the same or different component composition at any location on the layer.
- the constituent components of one cell adhesive layer and the other cell adhesive layer are the same, but the constituent concentration May be formed such that the cell adhesion layers are different.
- the outer shell layer may have the same or different constituent composition at any location on the layer.
- an outer shell layer may be formed.
- the cell adhesive hydrogel is preferably a collagen gel and the high strength hydrogel is an alginate gel.
- the cell type in the cell layer constituting the hollow microfiber of the present invention is not particularly limited as long as it is a cell that can be adhered and cultured on the cell adhesive layer.
- it is a cell having the property of constituting an in vivo lumen structure, for example, a vascular endothelial cell, a lymphatic cell or a tubular cell.
- the cell layer constituting the hollow microfiber of the present invention is preferably a monolayer cell layer.
- the cell adhesive layer constituting the hollow microfiber of the present invention may contain cells different from the cells constituting the cell layer.
- the cells constituting the cell layer are vascular endothelial cells
- vascular smooth muscle cells may be included in the cell adhesion layer adjacent to the cell layer.
- a layer composed of vascular smooth muscle cells can be formed so as to cover the outside of the cell layer composed of vascular endothelial cells.
- One embodiment of the present invention is a microfiber in which a hollow portion of the hollow microfiber of the present invention is filled with a suspension of cells constituting a cell layer.
- the suspension is not particularly limited as long as it does not have cytotoxicity, but preferably the cells are suspended in a liquid selected from the group consisting of polyethylene glycol, glycerol, alginate and dextran, and mixtures thereof. Prepared.
- One embodiment of the present invention is a hollow microfiber that can be obtained by removing the outer shell layer from the hollow microfiber of the present invention.
- another embodiment of the present invention can be obtained by removing the outer shell layer from a microfiber in which the hollow portion of the hollow microfiber of the present invention is filled with a suspension of cells constituting the cell layer.
- an enzyme treatment using an alginate lyase or the like, or a chelating agent such as EDTA is appropriately used.
- the microfiber from which only the outer shell layer containing the alginic acid gel has been removed can be prepared by removing calcium ions by acting at a concentration of.
- the microfiber of the present invention can be stored, for example, by sucking it into a silicon tube and stretching the gel in the longitudinal direction of the tube. If the microfiber after gelation is stored in water or a buffer solution, it is generally difficult to keep the gel in a straight line, but after placing the microfiber in water or a buffer solution, the inner diameter of the aqueous medium is reduced. By immersing the tip of the silicon tube of about 100 ⁇ m to several mm and sucking the silicon tube, the microfiber is sucked into the silicon tube from the tip and is stretched in the longitudinal direction of the tube into the silicon tube. Sucked.
- the gel can be stored, and when used, it is possible to prepare a gel having a desired length by cutting a silicon tube containing a microfiber into an appropriate length.
- appropriate agents such as preservatives, pH adjusters, and buffering agents can be added to the tube as necessary.
- One aspect of the present invention is (1) at least one cell adhesive layer containing a cell adhesive hydrogel, and (2) a cell located at the most distal portion from the central axis in the at least one cell adhesive layer.
- a method for producing a microfiber comprising a layer and (4) a cell suspension filling a hollow part, comprising the following steps: (I) forming a laminar flow of cell suspension; (Ii) forming at least one laminar flow of the cell-adhesive hydrogel preparation solution covering the outer periphery of the laminar flow of the cell suspension; (Iii) A high-strength hydrogel that covers the outer periphery of the laminar flow of the cell-adhesive hydrogel preparation solution located
- the microfiber manufacturing method includes, for example, a cell suspension introduction tube, at least one solution introduction tube for preparing a cell adhesive hydrogel that is coaxial with the cell suspension introduction tube, and the cell suspension introduction tube. And a high-intensity hydrogel preparation solution introduction tube, a gelation region of the high-strength hydrogel preparation solution, and a cell adhesion hydrogel preparation that are coaxial with the at least one cell adhesion hydrogel preparation solution introduction tube This can be done using a microfluidic device with a gelled region of the solution.
- FIG. 5 is a schematic view showing an example of a method for producing the microfiber of the present invention in which the number of cell adhesive layers is one using a triple coaxial laminar flow device.
- the cell suspension 1 is ejected from the cell suspension introduction tube 2 to form a laminar flow
- the cell adhesion hydrogel preparation solution 3 is ejected from the cell adhesion hydrogel preparation solution introduction tube 4 to produce cells.
- a laminar flow of the cell-adhesive hydrogel preparation solution covering the outer periphery of the laminar flow of the suspension is formed, and the high-strength hydrogel preparation solution 5 is injected from the high-intensity hydrogel preparation solution introduction tube 6.
- a laminar flow of the high-strength hydrogel preparation solution covering the outer periphery of the laminar flow of the cell-adhesive hydrogel preparation solution is formed.
- the formed laminar flow aggregate is passed through the cell adhesion hydrogel preparation solution and the gelation region 8 of the high strength hydrogel preparation solution to obtain the cell adhesion hydrogel preparation solution and the high strength hydrogel.
- Each preparation solution is gelled. For example, it may be gelled by introducing the formed laminar flow aggregate into the gelling agent solution 7 and / or applying other external stimuli. Then, the cells are cultured in the obtained microfiber to form a cell layer covering the inner periphery of the cell adhesive layer.
- FIG. 6 shows a cross-sectional view of a microfiber obtained using the apparatus of FIG.
- the material of the cell suspension introduction tube, the cell introduction hydrogel preparation solution introduction tube, and the high-strength hydrogel preparation solution introduction tube is not particularly limited.
- the inner diameter is not particularly limited, but is, for example, 0.1 mm to 10 mm.
- the microfiber of the present invention having two or more cell adhesion layers is, for example, between the cell adhesion hydrogel preparation solution introduction tube 4 and the high strength hydrogel preparation solution introduction tube 6 shown in FIG.
- an additional cell-adhesive hydrogel preparation solution introduction tube is provided, from which the cell-adhesion hydrogel preparation solution is injected, and injection from the cell-adhesion hydrogel preparation solution introduction tube disposed immediately before It can manufacture by forming the laminar flow of the cell adhesive hydrogel preparation solution which covers the outer periphery of the laminar flow of the cell adhesive hydrogel preparation solution formed in (1).
- the liquid in which the cells are suspended is non-cytotoxic and is viscous enough to allow the laminar flow of the cell-adhesive hydrogel preparation solution to be formed so as to cover the outer periphery of the laminar flow of the cell suspension. If it has, it will not specifically limit.
- a liquid having a viscosity of about 10 to 500 cP is preferred. More preferably, it is a liquid selected from the group consisting of polyethylene glycol, glycerol, alginate and dextran, and mixtures thereof.
- the cell density in the cell suspension is not particularly limited as long as the cells can be uniformly cultured on the cell adhesive layer in the produced microfiber.
- it is 1.0 ⁇ 10 6 cells / mL to 5.0 ⁇ 10 8 cells / mL, more preferably 1.0 ⁇ 10 6 cells / mL to 1.0 ⁇ 10 8 cells / mL. .
- laminar flow means that the flow line of the fluid is parallel to the ejection direction of the fluid. Also, “laminar flows” of adjacent fluids do not mix with each other, and streamlines are kept in a regular form.
- Reynolds number is an index that forms laminar flow.
- the Reynolds number is given by the following formula:
- v is a flow velocity (m / sec)
- L is a representative length (m)
- ⁇ is a kinematic viscosity coefficient (m 2 / sec)
- the Reynolds number of each flow of the cell suspension, the cell adhesive hydrogel preparation solution, and the high-strength hydrogel preparation solution is a value that is sufficient to form a laminar flow.
- the value is 2000 or less, any liquid can form a laminar flow.
- the gelation of the high-strength hydrogel preparation solution and the cell adhesion hydrogel preparation solution is performed by applying an external stimulus.
- the external stimulus is applied to each of the gelation region of the high-strength hydrogel preparation solution and the gelation region of the cell-adhesive hydrogel preparation solution.
- the gelation region of the high-strength hydrogel preparation solution and the gelation region of the cell-adhesive hydrogel preparation solution may be the same region or different regions.
- Examples of the external stimulus include, but are not limited to, addition of metal ions (for example, calcium ions), addition of enzymes, pH fluctuation, heating, UV irradiation, and radiation irradiation.
- the gelation conditions may be the same or different for the cell-adhesive hydrogel and the high-strength hydrogel.
- the gelation is performed under different conditions.
- the cell adhesive hydrogel preparation solution is a collagen solution
- it is gelled into a collagen gel by heating at about 37 ° C. for several minutes to 1 hour.
- the high-strength hydrogel preparation solution is a sodium alginate solution
- the laminar flow of the sodium alginate solution is passed through an aqueous solution (for example, calcium chloride aqueous solution) containing metal ions such as calcium ions, which is a gelling agent solution. Gel into alginate gel.
- the gelation of the solution for preparing a high-strength hydrogel is performed more rapidly than the gelation of the solution for preparing a cell adhesive hydrogel.
- the cell adhesive hydrogel preparation solution can be prevented from diffusing outside the outer shell layer.
- the cell adhesive layer to be formed may have the same or different component composition at any location on the layer.
- the constituent components of one cell adhesive layer and the other cell adhesive layer are the same, but the constituent concentration May be formed such that the cell adhesion layers are different.
- an anisotropic tubular structure in which portions having different characteristics coexist in one cell adhesive layer can be formed.
- Such a tubular structure has a concentration of, for example, a cell adhesive hydrogel preparation solution for forming one cell adhesive layer and a cell adhesive hydrogel preparation solution for forming the other cell adhesive layer. Can be made by forming a laminar flow of these solutions.
- the outer shell layer that is formed may have the same or different constituent composition at any location on the layer.
- the constituent components of one outer shell layer and the other outer shell layer are the same, but the constituent component concentrations are different.
- an outer shell layer may be formed.
- the concentration of the high-strength hydrogel preparation solution for forming one outer shell layer is different from the concentration of the high-strength hydrogel preparation solution for forming the other outer shell layer. Can be made by forming a laminar flow of these solutions.
- the cells introduced as a cell suspension are cultured in the hollow portion of the microfiber and positioned at the nearest position from the central axis.
- a cell layer covering the inner periphery of the cell adhesive layer is formed.
- the culture is performed, for example, by immersing the formed microfibers in a cell culture medium as they are.
- the nutrient component contained in the cell culture medium can pass through the outer shell layer and the cell adhesive layer by diffusion.
- Cell culture conditions are not particularly limited. For example, the culture is performed at 37 ° C. for 24 to 72 hours.
- a microfiber capable of feeding a liquid having a sufficient length (for example, 0.5 cm to 100 cm) and having a continuous lumen structure formed by a cell layer is produced. can do. Both the cell adhesive layer and the outer shell layer forming the microfiber have a substantially uniform thickness.
- One aspect of the present invention is a kit for performing the above-described microfiber manufacturing method, (I) a cell adhesive hydrogel preparation solution that is gelled to form a cell adhesive hydrogel; (ii) a high strength hydrogel preparation solution that is gelled to form a high strength hydrogel; The kit comprising (iii) a cell suspension; and (iv) instructions for producing the microfiber.
- One aspect of the present invention is (1) at least one cell adhesive layer containing a cell adhesive hydrogel, and (2) a cell located at the most distal portion from the central axis in the at least one cell adhesive layer.
- An outer shell layer containing a high-strength hydrogel covering the outer periphery of the adhesive layer, and (3) of the at least one cell adhesive layer, covering the inner periphery of the cell adhesive layer located at the most proximal portion from the central axis A method for producing a hollow microfiber comprising a cell layer.
- Such a hollow microfiber is manufactured by the method described above, (1) at least one cell adhesive layer containing a cell adhesive hydrogel, and (2) a central axis of the at least one cell adhesive layer.
- the method for removing the cell suspension is not particularly limited.
- the cell suspension can be removed by feeding a liquid other than the cell suspension into the hollow portion.
- a conventionally known artificial blood vessel is, for example, a tube made of a synthetic polymer, and stenosis due to a thrombus or deterioration of a material becomes a problem after transplantation.
- the hollow microfiber of the present invention manufactured using vascular endothelial cells is composed of blood vessel components, it is expected that the risk of thrombus formation is extremely low compared to an artificial blood vessel manufactured using an artificial material. Is done.
- it since it is composed of a living body-derived component, it is considered that once it is connected to a living tissue, it is sequentially replaced by cells divided after transplantation or recipient cells, and the need for re-transplantation is reduced.
- a new blood vessel network can be independently formed according to the in vivo environment around the transplant site.
- the microfiber of the present invention can be used for transplantation in regenerative medicine, but is not limited to this application.
- a pharmacokinetic model, an in vitro model system for cancer metastasis, an in vitro model system for thrombus formation, etc. are constructed using the microfiber of the present invention and a three-dimensional tissue produced using the microfiber. Therefore, it can be applied to drug screening.
- Comparative Example 1 Manufacture of a microfiber comprising a core part containing collagen gel and vascular endothelial cells, and a shell part containing alginate gel covering the core part.
- a double coaxial laminar flow device is used.
- Manufactured When the microfiber was cultured, a cell layer composed of vascular endothelial cells was spontaneously formed, but the cell layer was randomly formed and a continuous lumen structure could not be formed.
- Example 1 Production of a microfiber including a cell adhesive layer containing a collagen gel, an outer shell layer containing an alginate gel covering the outer periphery of the cell adhesive layer, and a vascular endothelial cell layer covering the inner periphery of the cell adhesive layer It manufactured using the apparatus shown in FIG.
- a cell suspension 1 a polyethylene glycol solution of vascular endothelial cells (2.0 ⁇ 10 7 cells / mL) is prepared, and injected from the cell suspension introduction tube 2 at a flow rate of 10 ⁇ l / min. A laminar flow was formed.
- a collagen aqueous solution (4 mg / ml) was prepared as the cell adhesion hydrogel preparation solution 3 and injected from the cell adhesion hydrogel preparation solution introduction tube 4 at a flow rate of 200 ⁇ l / min.
- a laminar flow of an aqueous collagen solution covering the outer periphery of the laminar flow was formed.
- a sodium alginate aqueous solution (1.5 mg / ml) was prepared as the high-strength hydrogel preparation solution 5 and injected from the high-strength hydrogel preparation solution introduction tube 6 at a flow rate of 125 ⁇ l / min.
- a laminar flow of aqueous sodium alginate covering the flow perimeter was formed.
- the resulting laminar flow aggregate was gelled in the gelation region 8 of the high strength hydrogel preparation solution and the cell adhesion hydrogel preparation solution. Specifically, it is introduced into a calcium chloride aqueous solution (100 mM, flow rate 2500 ⁇ l / min), which is a gelling agent solution 7, heated at 37 ° C. for 15 minutes, and microfiber (outer shell inner diameter: 270 ⁇ m, outer shell The outer diameter of the layer was 350 ⁇ m and the thickness of the collagen layer was 100 ⁇ m, both of which were calculated as the average value of the measured values from the images obtained by the phase contrast optical microscope.
- a calcium chloride aqueous solution 100 mM, flow rate 2500 ⁇ l / min
- microfiber outer shell inner diameter: 270 ⁇ m, outer shell
- the outer diameter of the layer was 350 ⁇ m and the thickness of the collagen layer was 100 ⁇ m, both of which were calculated as the average value of the measured values from the images obtained by the phase contrast optical microscope.
- Example 2 A microfiber comprising a cell adhesive layer containing vascular smooth muscle cells and collagen gel, an outer shell layer containing an alginate gel covering the outer periphery of the cell adhesive layer, and a vascular endothelial cell layer covering the inner periphery of the cell adhesive layer
- Manufacture of Cell Adhesive Hydrogel Solution 3 A collagen aqueous solution (4 mg / ml) containing vascular smooth muscle cells (1.25 ⁇ 10 6 cells / mL) was prepared, and the cell adhesive hydrogel preparation solution was prepared.
- a microfiber was manufactured in the same manner as in Example 1, except that the laminar flow of the collagen aqueous solution covering the outer periphery of the laminar flow of the cell suspension was formed by injecting from the introduction tube 4 at a flow rate of 200 ⁇ l / min. (The inner diameter of the outer shell layer: 270 ⁇ m, the outer diameter of the outer shell layer: 350 ⁇ m, the thickness of the collagen layer: 100 ⁇ m. It was calculated Te). By culturing cells in the obtained microfiber, a microfiber in which a vascular smooth muscle cell layer was laminated on the outside of a single vascular endothelial cell layer was obtained (FIG. 3).
- Example 3 The microfiber obtained in Example 1 was sandwiched between constricted glass tubes, and liquid was fed into the hollow portion of the microfiber.
- a liquid was fed using a syringe pump at a flow rate of 1 ⁇ L / min, the liquid could be fed into the hollow portion in the formed vascular endothelial layer.
- the hollow microfiber of the present invention can be suitably used as an alternative to in vivo lumen structures such as blood vessels and lymphatic vessels.
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Abstract
Description
[1]
(1)細胞接着性ハイドロゲルを含む少なくとも1つの細胞接着性層、
(2)前記少なくとも1つの細胞接着性層のうち、中心軸から最遠位部に位置する細胞接着性層の外周を覆う高強度ハイドロゲルを含む外殻層、及び
(3)前記少なくとも1つの細胞接着性層のうち、中心軸から最近位部に位置する細胞接着性層の内周を覆う細胞層
を含む、中空マイクロファイバ。
[2]
前記細胞接着性ハイドロゲルが、キトサンゲル、コラーゲンゲル、ゼラチン、ペプチドゲル、ラミニンゲル及びフィブリンゲル、並びにそれらの混合物からなる群から選択される、[1]に記載の中空マイクロファイバ。
[3]
前記高強度ハイドロゲルが、アルギン酸ゲル又はアガロースゲルである、[1]又は[2]に記載の中空マイクロファイバ。
[4]
外殻層の外径が20μm~500μmである、[1]~[3]のいずれか1つに記載の中空マイクロファイバ。
[5]
前記細胞層を構成する細胞が、血管内皮細胞、リンパ管細胞及び尿細管細胞からなる群から選択される、[1]~[4]のいずれか1つに記載の中空マイクロファイバ。
[6]
前記少なくとも1つの細胞接着性層のうち、少なくとも1つは、前記細胞層の細胞とは異なる細胞を含む、[1]~[5]のいずれか1つに記載の中空マイクロファイバ。
[7]
前記少なくとも1つの細胞接着性層の数が1層である、[1]~[6]のいずれか1つに記載の中空マイクロファイバ。
[8]
[1]~[7]のいずれか1つに記載の中空マイクロファイバから外殻層を除去することにより得ることができる、中空マイクロファイバ。
[9]
[1]~[7]のいずれか1つに記載の中空マイクロファイバの中空部が、前記細胞層を構成する細胞の懸濁液で満たされた、マイクロファイバ。
[10]
前記細胞の懸濁液が、ポリエチレングリコール、グリセロール、アルギン酸エステル及びデキストラン、並びにそれらの混合物からなる群から選択される液体に細胞を懸濁させて調製される、[9]に記載のマイクロファイバ。
[11]
[9]又は[10]に記載のマイクロファイバから外殻層を除去することにより得ることができる、マイクロファイバ。
[12]
(1)細胞接着性ハイドロゲルを含む少なくとも1つの細胞接着性層、
(2)前記少なくとも1つの細胞接着性層のうち、中心軸から最遠位部に位置する細胞接着性層の外周を覆う高強度ハイドロゲルを含む外殻層、
(3)前記少なくとも1つの細胞接着性層のうち、中心軸から最近位部に位置する細胞接着性層の内周を覆う細胞層、及び
(4)中空部を満たす細胞懸濁液
を含む、マイクロファイバを製造する方法であって、以下のステップ:
(i)細胞懸濁液の層流を形成し;
(ii)前記細胞懸濁液の層流の外周を覆う少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流を形成し;
(iii)前記少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流のうち、中心軸から最遠位部に位置する細胞接着性ハイドロゲル調製用溶液の層流の外周を覆う高強度ハイドロゲル調製用溶液の層流を形成し;
(iv)高強度ハイドロゲル調製用溶液をゲル化し、高強度ハイドロゲルを含む外殻層を形成する;
(v)細胞接着性ハイドロゲル調製用溶液をゲル化し、細胞接着性ハイドロゲルを含む細胞接着性層を形成する;そして
(vi)前記細胞懸濁液中で細胞を培養して、前記細胞層を形成すること
を含む、前記マイクロファイバの製造方法。
[13]
細胞懸濁液導入管、
前記細胞懸濁液導入管と同軸にある、少なくとも1つの細胞接着性ハイドロゲル調製用溶液導入管、
前記細胞懸濁液導入管及び前記少なくとも1つの細胞接着性ハイドロゲル調製用溶液導入管と同軸にある、高強度ハイドロゲル調製用溶液導入管、
高強度ハイドロゲル調製用溶液のゲル化領域、及び
細胞接着性ハイドロゲル調製用溶液のゲル化領域
を備えるマイクロ流体装置を用いて、
(1)細胞接着性ハイドロゲルを含む少なくとも1つの細胞接着性層、
(2)前記少なくとも1つの細胞接着性層のうち、中心軸から最遠位部に位置する細胞接着性層の外周を覆う高強度ハイドロゲルを含む外殻層、
(3)前記少なくとも1つの細胞接着性層のうち、中心軸から最近位部に位置する細胞接着性層の内周を覆う細胞層、及び
(4)中空部を満たす細胞懸濁液
を含む、マイクロファイバを製造する方法であって、以下のステップ:
(i)細胞懸濁液導入管から細胞懸濁液を射出して、細胞懸濁液の層流を形成し;
(ii)少なくとも1つの細胞接着性ハイドロゲル調製用溶液導入管から、細胞接着性ハイドロゲル調製用溶液を射出して、前記細胞懸濁液の層流の外周を覆う少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流を形成し;
(iii)前記高強度ハイドロゲル調製用溶液導入管から、高強度ハイドロゲル調製用溶液を射出して、前記少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流のうち、中心軸から最遠位部に位置する細胞接着性ハイドロゲル調製用溶液の層流の外周を覆う高強度ハイドロゲル調製用溶液の層流を形成し;
(iv)(i)~(iii)で形成された層流の集合体を、高強度ハイドロゲル調製用溶液のゲル化領域に通過させて、高強度ハイドロゲル調製用溶液をゲル化し、高強度ハイドロゲルを含む外殻層を形成する;
(v)(i)~(iii)で形成された層流の集合体を、細胞接着性ハイドロゲル調製用溶液のゲル化領域に通過させて、細胞接着性ハイドロゲル調製用溶液をゲル化し、細胞接着性ハイドロゲルを含む細胞接着性層を形成し、ここで本ステップは、ステップ(iv)の前若しくは後に行われるか、又はステップ(iv)と同時に行われ;そして
(vi)前記細胞懸濁液中で細胞を培養して、前記細胞層を形成すること
を含む、前記マイクロファイバの製造方法。
[14]
前記細胞懸濁液が、ポリエチレングリコール、グリセロール、アルギン酸エステル及びデキストラン、並びにそれらの混合物からなる群から選択される液体に細胞を懸濁させて調製される、[12]又は[13]に記載のマイクロファイバの製造方法。
[15]
前記細胞懸濁液中の細胞密度が、1.0 x 106 cells/mL~1.0 x 108 cells/mLである、[12]~[14]のいずれか1つに記載のマイクロファイバの製造方法。
[16]
前記細胞接着性ハイドロゲル調製用溶液及び前記高強度ハイドロゲル調製用溶液が異なる条件でゲル化される、[12]~[15]のいずれか1つに記載のマイクロファイバの製造方法。
[17]
前記細胞接着性ハイドロゲルが、キトサンゲル、コラーゲンゲル、ゼラチン、ペプチドゲル、ラミニンゲル又はフィブリンゲル、あるいはそれらの混合物からなる群から選択される、[12]~[16]のいずれか1つに記載のマイクロファイバの製造方法。
[18]
前記高強度ハイドロゲルが、アルギン酸ゲル又はアガロースゲルである、[12]~[17]のいずれか1つに記載のマイクロファイバの製造方法。
[19]
前記細胞接着性ハイドロゲルがコラーゲンゲルであり、前記高強度ハイドロゲルがアルギン酸ゲルである、[12]~[18]のいずれか1つに記載のマイクロファイバの製造方法。
[20]
[12]~[19]のいずれか1つに記載の方法で製造された、マイクロファイバ。
[21]
[20]に記載のマイクロファイバから外殻層を除去することにより得ることができる、マイクロファイバ。
[22]
(1)細胞接着性ハイドロゲルを含む少なくとも1つの細胞接着性層、
(2)前記少なくとも1つの細胞接着性層のうち、中心軸から最遠位部に位置する細胞接着性層の外周を覆う高強度ハイドロゲルを含む外殻層、及び
(3)前記少なくとも1つの細胞接着性層のうち、中心軸から最近位部に位置する細胞接着性層の内周を覆う細胞層
を含む、中空マイクロファイバを製造する方法であって、[12]~[19]のいずれか一つに記載の方法で製造されたマイクロファイバから細胞懸濁液を除去するステップを含む、前記方法。
[23]
[22]に記載の方法で製造された、中空マイクロファイバ。
[24]
[23]に記載の中空マイクロファイバから外殻層を除去することにより得ることができる、中空マイクロファイバ。
[25]
[12]~[19]のいずれか1つに記載のマイクロファイバの製造方法を行うためのキットであって、
(i)ゲル化されて細胞接着性ハイドロゲルが形成される、細胞接着性ハイドロゲル調製用溶液;
(ii)ゲル化されて高強度ハイドロゲルが形成される、高強度ハイドロゲル調製用溶液;
(iii)細胞懸濁液;及び
(iv)前記マイクロファイバを製造するための説明書
を含む、前記キット。
(i)細胞懸濁液の層流を形成し;
(ii)前記細胞懸濁液の層流の外周を覆う少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流を形成し;
(iii)前記少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流のうち、中心軸から最遠位部に位置する細胞接着性ハイドロゲル調製用溶液の層流の外周を覆う高強度ハイドロゲル調製用溶液の層流を形成し;
(iv)高強度ハイドロゲル調製用溶液をゲル化し、高強度ハイドロゲルを含む外殻層を形成する;
(v)細胞接着性ハイドロゲル調製用溶液をゲル化し、細胞接着性ハイドロゲルを含む細胞接着性層を形成する;そして
(vi)前記細胞懸濁液中で細胞を培養して、前記細胞層を形成すること
を含む、前記マイクロファイバの製造方法である。
で表される。
(i)ゲル化されて細胞接着性ハイドロゲルが形成される、細胞接着性ハイドロゲル調製用溶液;(ii)ゲル化されて高強度ハイドロゲルが形成される、高強度ハイドロゲル調製用溶液;(iii)細胞懸濁液;及び(iv)前記マイクロファイバを製造するための説明書を含む、前記キットである。
コラーゲンゲル及び血管内皮細胞を含むコア部、並びに当該コア部を覆うアルギン酸ゲルを含むシェル部からなるマイクロファイバの製造
非特許文献1に記載された方法で、二重の同軸の層流装置を用いて製造した。当該マイクロファイバを培養すると、血管内皮細胞からなる細胞層が自発的に形成されたが、細胞層がランダムに形成され、連続的な管腔構造を形成することはできなかった。
(a)コラーゲンゲルを含む細胞接着性層、当該細胞接着性層の外周を覆うアルギン酸ゲルを含む外殻層、及び当該細胞接着性層の内周を覆う血管内皮細胞層を含むマイクロファイバの製造
図5に示す装置を用いて製造した。細胞懸濁液1として、血管内皮細胞のポリエチレングリコール溶液(2.0 x 107cells/mL)を調製し、細胞懸濁液導入管2から流速10 μl/minで射出して、当該溶液の層流を形成した。細胞接着性ハイドロゲル調製用溶液3として、コラーゲン水溶液(4 mg/ml)を調製し、細胞接着性ハイドロゲル調製用溶液導入管4から流速200 μl/minで射出して、細胞懸濁液の層流の外周を覆うコラーゲン水溶液の層流を形成した。高強度ハイドロゲル調製用溶液5として、アルギン酸ナトリウム水溶液(1.5 mg/ml)を調製し、高強度ハイドロゲル調製用溶液導入管6から流速125 μl/minで射出して、コラーゲン水溶液の層流の外周を覆うアルギン酸ナトリウム水溶液の層流を形成した。得られる層流の集合体を、高強度ハイドロゲル調製用溶液、及び細胞接着性ハイドロゲル調製用溶液のゲル化領域8においてゲル化した。具体的には、ゲル化剤溶液7である塩化カルシウム水溶液(100mM、流速2500 μl/min)に導入し、37℃で15分間加熱し、マイクロファイバ(外殻層の内径:270 μm、外殻層の外径:350 μm、コラーゲン層の厚み:100 μm。いずれも、位相差光学顕微鏡による画像からの計測値の平均値として計算された)を製造した。得られたマイクロファイバ中で細胞培養することにより、コラーゲン層の内周を均一に覆う単層の血管内皮細胞層が形成された。
(b)外殻層の溶解
(a)で得られたマイクロファイバにアルギン酸リアーゼを作用させることで、外殻層のアルギン酸ゲルを溶解した(図2)。
血管平滑筋細胞及びコラーゲンゲルを含む細胞接着性層、当該細胞接着性層の外周を覆うアルギン酸ゲルを含む外殻層、及び当該細胞接着性層の内周を覆う血管内皮細胞層を含むマイクロファイバの製造
細胞接着性ハイドロゲル調製用溶液3として、血管平滑筋細胞(1.25 x 106 cells/mL)を含むコラーゲン水溶液(4 mg/ml)を調製し、細胞接着性ハイドロゲル調製用溶液導入管4から流速200 μl/minで射出して、細胞懸濁液の層流の外周を覆うコラーゲン水溶液の層流を形成すること以外は、実施例1と同様にして、マイクロファイバを製造した(外殻層の内径:270 μm、外殻層の外径:350 μm、コラーゲン層の厚み:100 μm。いずれも、位相差光学顕微鏡による画像からの計測値の平均値として計算された)。得られたマイクロファイバ中で細胞培養することにより、単層の血管内皮細胞層の外側に血管平滑筋細胞層が積層されたマイクロファイバが得られた(図3)。
実施例1で得られたマイクロファイバを狭窄したガラス管に挟むことにより,マイクロファイバの中空部に送液を行った。シリンジポンプを利用して流速1 μL/minで送液を行ったところ、形成した血管内皮層内の中空部に送液が可能であった。直径5 μmのポリスチレンビーズの分散液を送液したところ、光学顕微鏡でビーズが送液に伴い中空部を移動することを確認した(図4の上部(t=0秒)と下部(t=18秒)を参照。図中、矢印はポリスチレンビーズを示す)。
2 細胞懸濁液導入管
3 細胞接着性ハイドロゲル調製用溶液
4 細胞接着性ハイドロゲル調製用溶液導入管
5 高強度ハイドロゲル調製用溶液
6 高強度ハイドロゲル調製用溶液導入管
7 ゲル化剤溶液
8 高強度ハイドロゲル調製用溶液、及び細胞接着性ハイドロゲル調製用溶液のゲル化領域
9 中空部
10 細胞層
11 細胞接着性層
12 外殻層
Claims (25)
- (1)細胞接着性ハイドロゲルを含む少なくとも1つの細胞接着性層、
(2)前記少なくとも1つの細胞接着性層のうち、中心軸から最遠位部に位置する細胞接着性層の外周を覆う高強度ハイドロゲルを含む外殻層、及び
(3)前記少なくとも1つの細胞接着性層のうち、中心軸から最近位部に位置する細胞接着性層の内周を覆う細胞層
を含む、中空マイクロファイバ。 - 前記細胞接着性ハイドロゲルが、キトサンゲル、コラーゲンゲル、ゼラチン、ペプチドゲル、ラミニンゲル及びフィブリンゲル、並びにそれらの混合物からなる群から選択される、請求項1に記載の中空マイクロファイバ。
- 前記高強度ハイドロゲルが、アルギン酸ゲル又はアガロースゲルである、請求項1又は2に記載の中空マイクロファイバ。
- 外殻層の外径が20μm~500μmである、請求項1~3のいずれか1項に記載の中空マイクロファイバ。
- 前記細胞層を構成する細胞が、血管内皮細胞、リンパ管細胞及び尿細管細胞からなる群から選択される、請求項1~4のいずれか1項に記載の中空マイクロファイバ。
- 前記少なくとも1つの細胞接着性層のうち、少なくとも1つは、前記細胞層の細胞とは異なる細胞を含む、請求項1~5のいずれか1項に記載の中空マイクロファイバ。
- 前記少なくとも1つの細胞接着性層の数が1層である、請求項1~6のいずれか1項に記載の中空マイクロファイバ。
- 請求項1~7のいずれか1項に記載の中空マイクロファイバの中空部が、前記細胞層を構成する細胞の懸濁液で満たされた、マイクロファイバ。
- 前記細胞の懸濁液が、ポリエチレングリコール、グリセロール、アルギン酸エステル及びデキストラン、並びにそれらの混合物からなる群から選択される液体に細胞を懸濁させて調製される、請求項8に記載のマイクロファイバ。
- 請求項1~7のいずれか1項に記載の中空マイクロファイバから外殻層を除去することにより得ることができる、中空マイクロファイバ。
- 請求項8又は9に記載のマイクロファイバから外殻層を除去することにより得ることができる、マイクロファイバ。
- (1)細胞接着性ハイドロゲルを含む少なくとも1つの細胞接着性層、
(2)前記少なくとも1つの細胞接着性層のうち、中心軸から最遠位部に位置する細胞接着性層の外周を覆う高強度ハイドロゲルを含む外殻層、
(3)前記少なくとも1つの細胞接着性層のうち、中心軸から最近位部に位置する細胞接着性層の内周を覆う細胞層、及び
(4)中空部を満たす細胞懸濁液
を含む、マイクロファイバを製造する方法であって、以下のステップ:
(i)細胞懸濁液の層流を形成し;
(ii)前記細胞懸濁液の層流の外周を覆う少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流を形成し;
(iii)前記少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流のうち、中心軸から最遠位部に位置する細胞接着性ハイドロゲル調製用溶液の層流の外周を覆う高強度ハイドロゲル調製用溶液の層流を形成し;
(iv)高強度ハイドロゲル調製用溶液をゲル化し、高強度ハイドロゲルを含む外殻層を形成する;
(v)細胞接着性ハイドロゲル調製用溶液をゲル化し、細胞接着性ハイドロゲルを含む細胞接着性層を形成する;そして
(vi)前記細胞懸濁液中で細胞を培養して、前記細胞層を形成すること
を含む、前記マイクロファイバの製造方法。 - 細胞懸濁液導入管、
前記細胞懸濁液導入管と同軸にある、少なくとも1つの細胞接着性ハイドロゲル調製用溶液導入管、
前記細胞懸濁液導入管及び前記少なくとも1つの細胞接着性ハイドロゲル調製用溶液導入管と同軸にある、高強度ハイドロゲル調製用溶液導入管、
高強度ハイドロゲル調製用溶液のゲル化領域、及び
細胞接着性ハイドロゲル調製用溶液のゲル化領域
を備えるマイクロ流体装置を用いて、
(1)細胞接着性ハイドロゲルを含む少なくとも1つの細胞接着性層、
(2)前記少なくとも1つの細胞接着性層のうち、中心軸から最遠位部に位置する細胞接着性層の外周を覆う高強度ハイドロゲルを含む外殻層、
(3)前記少なくとも1つの細胞接着性層のうち、中心軸から最近位部に位置する細胞接着性層の内周を覆う細胞層、及び
(4)中空部を満たす細胞懸濁液
を含む、マイクロファイバを製造する方法であって、以下のステップ:
(i)細胞懸濁液導入管から細胞懸濁液を射出して、細胞懸濁液の層流を形成し;
(ii)少なくとも1つの細胞接着性ハイドロゲル調製用溶液導入管から、細胞接着性ハイドロゲル調製用溶液を射出して、前記細胞懸濁液の層流の外周を覆う少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流を形成し;
(iii)前記高強度ハイドロゲル調製用溶液導入管から、高強度ハイドロゲル調製用溶液を射出して、前記少なくとも1つの細胞接着性ハイドロゲル調製用溶液の層流のうち、中心軸から最遠位部に位置する細胞接着性ハイドロゲル調製用溶液の層流の外周を覆う高強度ハイドロゲル調製用溶液の層流を形成し;
(iv)(i)~(iii)で形成された層流の集合体を、高強度ハイドロゲル調製用溶液のゲル化領域に通過させて、高強度ハイドロゲル調製用溶液をゲル化し、高強度ハイドロゲルを含む外殻層を形成する;
(v)(i)~(iii)で形成された層流の集合体を、細胞接着性ハイドロゲル調製用溶液のゲル化領域に通過させて、細胞接着性ハイドロゲル調製用溶液をゲル化し、細胞接着性ハイドロゲルを含む細胞接着性層を形成し、ここで本ステップは、ステップ(iv)の前若しくは後に行われるか、又はステップ(iv)と同時に行われ;そして
(vi)前記細胞懸濁液中で細胞を培養して、前記細胞層を形成すること
を含む、前記マイクロファイバの製造方法。 - 前記細胞懸濁液が、ポリエチレングリコール、グリセロール、アルギン酸エステル及びデキストラン、並びにそれらの混合物からなる群から選択される液体に細胞を懸濁させて調製される、請求項12又は13に記載のマイクロファイバの製造方法。
- 前記細胞懸濁液中の細胞密度が、1.0 x 106 cells/mL~1.0 x 108 cells/mLである、請求項12~14のいずれか1項に記載のマイクロファイバの製造方法。
- 前記細胞接着性ハイドロゲル調製用溶液及び前記高強度ハイドロゲル調製用溶液が異なる条件でゲル化される、請求項12~15のいずれか1項に記載のマイクロファイバの製造方法。
- 前記細胞接着性ハイドロゲルが、キトサンゲル、コラーゲンゲル、ゼラチン、ペプチドゲル、ラミニンゲル又はフィブリンゲル、並びにそれらの混合物からなる群から選択される、請求項12~16のいずれか1項に記載のマイクロファイバの製造方法。
- 前記高強度ハイドロゲルが、アルギン酸ゲル又はアガロースゲルである、請求項12~17のいずれか1項に記載のマイクロファイバの製造方法。
- 前記細胞接着性ハイドロゲルがコラーゲンゲルであり、前記高強度ハイドロゲルがアルギン酸ゲルである、請求項12~16のいずれか1項に記載のマイクロファイバの製造方法。
- 請求項12~19のいずれか1項に記載の方法で製造された、マイクロファイバ。
- 請求項20に記載のマイクロファイバから外殻層を除去することにより得ることができる、マイクロファイバ。
- (1)細胞接着性ハイドロゲルを含む少なくとも1つの細胞接着性層、
(2)前記少なくとも1つの細胞接着性層のうち、中心軸から最遠位部に位置する細胞接着性層の外周を覆う高強度ハイドロゲルを含む外殻層、及び
(3)前記少なくとも1つの細胞接着性層のうち、中心軸から最近位部に位置する細胞接着性層の内周を覆う細胞層
を含む、中空マイクロファイバを製造する方法であって、請求項12~19のいずれか一項に記載の方法で製造されたマイクロファイバから細胞懸濁液を除去するステップを含む、前記方法。 - 請求項22に記載の方法で製造された、中空マイクロファイバ。
- 請求項22に記載の中空マイクロファイバから外殻層を除去することにより得ることができる、中空マイクロファイバ。
- 請求項12~19のいずれか1項に記載のマイクロファイバの製造方法を行うためのキットであって、
(i)ゲル化されて細胞接着性ハイドロゲルが形成される、細胞接着性ハイドロゲル調製用溶液;
(ii)ゲル化されて高強度ハイドロゲルが形成される、高強度ハイドロゲル調製用溶液;
(iii)細胞懸濁液;及び
(iv)前記マイクロファイバを製造するための説明書
を含む、前記キット。
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JP6710000B2 (ja) | 2020-06-17 |
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