WO2004074463A1 - 細胞分離用ハイドロゲルおよび細胞の分離方法 - Google Patents
細胞分離用ハイドロゲルおよび細胞の分離方法 Download PDFInfo
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- WO2004074463A1 WO2004074463A1 PCT/JP2004/001856 JP2004001856W WO2004074463A1 WO 2004074463 A1 WO2004074463 A1 WO 2004074463A1 JP 2004001856 W JP2004001856 W JP 2004001856W WO 2004074463 A1 WO2004074463 A1 WO 2004074463A1
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- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/24—Methods of sampling, or inoculating or spreading a sample; Methods of physically isolating an intact microorganisms
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
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- 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
- C12M47/00—Means for after-treatment of the produced biomass or of the fermentation or metabolic products, e.g. storage of biomass
- C12M47/04—Cell isolation or sorting
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- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/06—Animal cells or tissues; Human cells or tissues
Definitions
- the present invention relates to the property of moving cells and cells or organisms (hereinafter referred to as "cells / organisms") according to the strength of chemotaxis or the properties of a field (e.g., The present invention relates to a hydrogel for separating cells, microorganisms, and the like by utilizing viscotaxis, and a method for separating cells and organisms using such a hydrogel.
- the present invention utilizes the property of migrating according to the concentration of a bioactive substance inherent in many organisms (chemotaxis), or the property of migrating according to the strength of a field, For selectively moving cells, microorganisms, and the like, thereby separating the cells and organisms (ie, performing an operation involving selective movement, such as separation (fractionation, fractionation, or fractionation)).
- the present invention relates to a hide-mouth gel and a method for separating cells and organisms using such a hide-mouth gel.
- cells are separated (differentiated, sorted, or separated) based on differences in chemotactic performance against factors related to immune diseases such as atopic dermatitis, allergy, and rheumatism. Sorting etc.).
- hydrogel of the present invention for example, cells can be separated (differentiated, fractionated, or fractionated) by differences in chemotactic performance with respect to factors related to cancer treatment and metastasis of cancer cells. Etc.).
- the hydrogel of the present invention can be used, for example, in the field of regenerative medicine, in the induction, formation, regeneration, etc. of tissues and organs such as blood vessels and nerves. Cells can be separated (fractionated, sorted, or sorted, etc.) by the difference in chemotactic performance for the relevant factors.
- hydrogel of the present invention it is possible to use the hydrogel of the present invention to separate (fraction, sort, or sort) cells based on differences in motility and the like, for example, in connection with techniques for selecting excellent sperm. Become.
- cells can be separated (fractionation, fractionation, or fractionation, etc.) using the hydrogel of the present invention, for example, by utilizing differences in chemotaxis (eg, electrophoretic mobility) with respect to an electric field. It becomes possible.
- chemotaxis eg, electrophoretic mobility
- a motif (or a part thereof) has the ability to move, in response to an external stimulus, exercising, and if its motility has a certain direction, the property of this creature is called chemotaxis. This is a well-known property. If the stimulus is a substance, its properties are called chemotaxis. On the other hand, when the stimulus is a physical stimulus, it is called electrotaxis, magnetotaxis, phototaxis, thermotaxis, viscometer, etc., depending on the physical stimulus.
- Organisms having the above motility include lower animals, plants, microorganisms, cells and organisms, and most organisms on the earth are considered to have running performance.
- chemotaxis of living organisms particularly the chemotaxis of cells, plays an important role in living organisms.
- the induction and regeneration of blood vessels require the proliferation of vascular endothelial cells, and the induction and regeneration of blood vessels in response to a gradient in the concentration of vascular epidermal growth factor, ie, the chemotactic activity of vascular endothelial cells. It has been found that guidance and regeneration are performed depending on the performance.
- cancer cells with high auxotrophy secrete vascular endothelial cell growth factor and It is well known to induce blood vessels from blood vessels into cancer tissue.
- the vascular system is induced and regenerated by the gradient of oxygen concentration.
- vascular endothelial cells exhibit negative chemotactic performance for oxygen.
- the induction and regeneration of a neural network is also performed in vivo by imparting a concentration gradient of a nerve cell growth factor to a field. It is also well known that chemotactic properties of immune-related cells such as leukocytes are exerted in response to an allergen causing an allergic reaction, and leukocytes and the like are accumulated at the reaction site. Furthermore, the possibility of cancer metastasis being caused by cancer cells having high chemotactic performance is increasing.
- chemotaxis due to physical stimulation is also well known.
- the growth of plants in the light direction is well known as phototaxis.
- cells that exhibit various electrophoretic performances in cell electrophoresis are known.
- cells having high motility, such as sperm have a high correlation between their motility and function.
- the running performance of living organisms, especially cells, especially chemotactic performance is a very important property for controlling the function of living organisms.
- lymphocytes include B lymphocytes and T lymphocytes, and B lymphocytes differentiate into many plasma cells upon external stimuli.
- T lymphocytes are classified according to their functions into killer T cells, helper T cells, sublesser T cells, and various T cell subpopulations of organisms. Also, it is becoming clear that macrophages have various subpopulations.
- cancer cells in cancer tissues are also diverse, and it has been found that there is a large distribution in drug or radiation resistance, proliferation ability, metastatic property, and the like. Further, it is well known that stem cells existing in bone marrow are differentiated into various cells depending on the environment.
- each of these diverse cell groups has its own migration performance, and cells can be fractionated for each migration performance.
- cells can be fractionated for each migration performance.
- sort and sort cells having different running performances, it will be a great step forward to elucidate cell functions.
- Today it is considered possible to develop new treatments for immune-related diseases and cancers for which there is no effective treatment, and to develop more efficient tissue and organ regenerative medicine techniques.
- An object of the present invention is to provide a hydrogel for separating cells and organisms and a method for separating cells and organisms, which can solve the above-mentioned disadvantages of the prior art.
- Another object of the present invention is to provide, as described above, a port capable of separating (fractionating, fractionating or sorting, etc.) cells and organisms having various running performances that could not be achieved by the conventional technology. It is to provide a gel.
- Still another object of the present invention is to provide a method for separating cells and organisms using hydrogel according to their running performance.
- the present inventors have performed the separation of cells and organisms using a hydrogel having a specific structure or a gel with a high-opening mouth capable of realizing a difference in the concentration of a specific substance inside or outside a gel. Found that it was extremely effective in achieving the above objectives.
- the gel for a cell / organism separation according to the present invention is based on the above findings, and more specifically, a cell / organism capable of selectively moving cells according to the concentration difference of a physiologically active substance. It is a hydrogel for separation.
- a thermoreversible sol-gel transition phenomenon in which a sol state is formed at a low temperature and a gel is formed at a high temperature, and The above-mentioned hydrogel for cell / biological separation is provided, wherein the gel is substantially water-insoluble at a high temperature.
- a gel-forming composition comprising at least water and a hydrogel-forming polymer; a reversible sol state at a temperature lower than the sol-gel transition temperature; Use a gel-forming composition that becomes a substantially water-insoluble gel at temperatures above the transition temperature;
- aqueous solution containing a physiologically active substance is brought into contact with one side of the gel-state composition at a temperature higher than the sol-gel transition temperature of the gel-forming composition; and the other of the gel-state composition Contacting a suspension of cells and organisms with the surface side of the
- the cells and organisms While forming a concentration gradient of the physiologically active substance in the composition in the gel state, the cells and organisms are transferred from the suspension into the composition in the gel state by the chemotaxis induced by the concentration gradient.
- the separated portion of the composition in the gel state is cooled to a temperature lower than the sol-gel transition temperature to form a sol, and at least a step of recovering the cells and the organism from the composition in the sol state is performed.
- a separation method is provided.
- a gel-forming composition comprising at least water and a hydrogel-forming polymer; a reversible sol state at a temperature lower than the sol-gel transition temperature; Use a gel-forming composition that becomes a substantially water-insoluble gel at temperatures above the transition temperature;
- composition in a gel state with an aqueous solution containing a physiologically active substance at a temperature higher than the sol-gel transition temperature;
- the physiologically active substance is transferred into the composition in the gel state to form a concentration gradient of the physiologically active substance in the composition, and the cells and organisms in the composition are transformed according to the concentration gradient.
- a cell / organism including at least a step of cooling the separated portion of the composition in the gel state to a temperature lower than the sol-gel transition temperature to form a sol, and recovering the cell / organism from the composition in the sol state.
- a gel-forming composition comprising at least water and a hydrogel-forming polymer; a reversible sol state at a temperature lower than the sol-gel transition temperature; Use a gel-forming composition that becomes a substantially water-insoluble gel at temperatures above the transition temperature;
- the gel-state composition is Contacting a suspension of organisms to transfer cells and organisms from the suspension into the gel composition;
- the separated gel-state composition is converted into a sol state at a temperature lower than the sol-gel transition temperature, and at least a step of recovering cells transferred into the composition from the sol-state composition
- a method for separating cells and organisms is provided.
- a gel-forming composition comprising at least water and a hydrogel-forming polymer; a reversible sol state at a temperature lower than the sol-gel transition temperature; Use a gel-forming composition that becomes a substantially water-insoluble gel at temperatures above the transition temperature;
- the gel-state composition is brought into contact with a cell-organism suspension, and the cells are transferred from the cell-organism suspension into the gel-state composition by the chemotaxis induced by the gradient of each property. Transferring the organism, the cells, separating at least a part of the gel-state composition into which the organism has been transferred from the other part of the composition, and
- a cell / organism including at least a step of cooling the separated portion of the composition in the gel state to a temperature lower than the sol-gel transition temperature to form a sol, and recovering the cell / organism from the composition in the sol state.
- a gel-forming composition comprising at least water and a hydrogel-forming polymer;
- a gel-forming composition that reversibly enters a sol state at a lower temperature and becomes a substantially water-insoluble gel state at a temperature higher than the sol-gel transition temperature;
- composition in the gel state in a field where the physical properties change continuously to form a gradient of each physical property in the composition; Relocating cells / organisms that have been substantially uniformly distributed in the composition with the composition in a gel state due to the difference in migration performance for each physical property,
- a cell / organism including at least a step of cooling the separated portion of the composition in the gel state to a temperature lower than the sol-gel transition temperature to form a sol, and recovering the cell / organism from the composition in the sol state.
- the hydrogel for example, exhibits a sol-gel transition phenomenon in which the sol state is formed at a low temperature and gels at a high temperature, and the sol-gel transition is thermoreversible and higher than the sol-gel transition temperature
- the concentration of a physiologically active substance that induces chemotaxis in cells and organisms
- a physiologically active substance that induces chemotaxis in cells and organisms
- the cell / organism is made to have chemotaxis to each property by creating gradients of various properties such as electric field, magnetic field, luminous intensity, temperature, and viscosity in the gel of the mouth. Can be separated (fractionation, fractionation or fractionation, etc.) depending on the difference in
- a suspension of an aqueous solution containing a physiologically active substance and a cell / organism for separation is used at a temperature higher than the sol-gel transition temperature using the above-mentioned mouth gel.
- a concentration gradient of the physiologically active substance is created in the hydrogel, and the cells and organisms are transferred from the cell and organism suspension into the hide mouth gel by the chemotaxis induced by the concentration gradient. Can be migrated.
- the transferability or migration distance of various cells / organisms into the hydrogel differs depending on the difference in the chemotactic performance of the sorting cells / organisms.
- the sol state containing cells and organisms is obtained by cutting out the hydrogel of a portion containing cells and organisms having different conversion performances, that is, different migration distances, and cooling it to a temperature lower than the sol-gel transition temperature of the hydrogel. Can be produced. Next, a large amount of cells and biological culture or preservation solution is added to the sol, and the polymer solution is diluted so that it does not gel even at a temperature higher than the sol-gel transition temperature, and then subjected to normal separation such as centrifugation or membrane separation. It is possible to separate cells and organisms (fractionation, fractionation or sorting, etc.) by this method.
- the hydrogel is brought into a sol state by lowering the temperature to a temperature lower than the sol-gel transition temperature, and cells / organisms for separation are added to prepare a cell / organism suspension. Can .
- the cell / organism suspension is heated to a temperature higher than the above-mentioned sol-gel transition temperature to cause gelation, thereby producing a hydrogel in which the cells / organisms for separation are substantially uniformly dispersed inside.
- the hydrogel is brought into contact with an aqueous solution containing a physiologically active substance (chemotaxis factor) to transfer the physiologically active substance into the hydrogel, whereby the concentration gradient of the physiologically active substance in the hydrogel is reduced. Make it.
- a physiologically active substance chemotaxis factor
- the above-mentioned hydrogel is converted into a sol-state aqueous solution by lowering the temperature to a temperature lower than the sol-gel transition temperature, and a physiologically active substance is substantially uniformly mixed with the sol-state aqueous solution.
- the cells are separated and separated as a sol-state aqueous solution by lowering the sol-gel transition temperature. Separation (fractionation, fractionation, or fractionation, etc.) may be.
- the hydrogel is placed in a field where physical properties selected from electric field strength, magnetic field strength, luminous intensity, temperature, viscosity and the like are continuously changed, and the gradient of the property is set in the field.
- the gel is made in a gel with a hydrogel and then the hydrogel is contacted with a suspension of cells and organisms for sorting. Then, the cells and organisms can be transferred from the cell and organism suspension into the hide mouth gel by the chemotaxis caused by the gradient of each property.
- the migration or migration distance of various cells / organisms into the gel at the hide mouth differs depending on the difference in the migration performance of the cells / organisms for sorting against the physical properties of the organisms.
- the hydrogel to which the cells / organisms have migrated or the hydrogel having a different running performance is cut out and cooled to a temperature lower than the sol-gel transition temperature of the hydrogel.
- ⁇ Create a sol containing living organisms.
- a large amount of cells or a biological culture solution or a preservation solution is added to the sol, and the polymer solution is diluted so as not to gel even at a temperature higher than the sol-gel transition temperature, and then subjected to a normal separation method such as centrifugation or membrane separation. Cells and organisms can be separated (fractionation, fractionation, or fractionation, etc.).
- the hydrogel is brought into a sol state by lowering the temperature to below the Zolgel transition temperature, and cells / organisms for separation are added to prepare a cell / organism suspension. it can.
- the cell / organism suspension is heated to a temperature higher than the above-mentioned sol-gel transition temperature to gel, thereby producing a hydrogel in which cells / organisms for separation are substantially uniformly dispersed.
- the gel is placed in a place where properties selected from electric field strength, magnetic field strength, luminous intensity, temperature, and viscosity change continuously, and a gradient of each property is produced in the hydrogel.
- the hydrogel for cell / biological separation (fractionation, fractionation, or fractionation, etc.) of the present invention utilizes hydrophobic bonds at least partially for crosslinking. Presumed. Hydrophobic bonds are the only physical bonds among various physical bonds that become stronger as the temperature rises.
- the sol-gel transition temperature of the hydrogel can be changed by changing the hydrophobic bonding force of the cross-linking point.
- the sol-gel transition temperature of the gel of the present invention is preferably higher than 0 ° C and not higher than 45 ° C.
- the physical properties of the above-described hydrogel are such that the process of embedding cells, organisms, microorganisms, tissues, organs, and the like in the hydrogel and recovering the same from the hydrogel involves thermal damage or enzymatic damage. Enables implementation without substantial provision.
- agar gel which exhibits a positive temperature-solubility change
- the temperature at which the gel transfers to the sol due to its strong binding force is about 95 ° C, which is significantly higher than the physiological temperature range (usually 0 ° C to 40 ° C), so cells, organisms, microorganisms, tissues, Embedding and recovery of organs in agar gel were not possible.
- the crosslinks are formed by ionic bonds and the bonding strength is strong, and it is difficult to transfer the gel to sol under physiological conditions.
- the gel of the present invention is that cells, organisms, microorganisms, tissues, organs, and the like can move (to a certain extent) in the hydrogel.
- the binding energy of the cross-linking point of a three-dimensional network of hydrogel is AF
- the crosslink point of the hydrogel is in a bonded state for an operation having a frequency higher than 1 / (sec- 1 ). That is, it corresponds as a cross-linked structure, and for an operation having a frequency lower than ⁇ ⁇ ⁇ (sec- 1 ), the cross-linking point of the hydrogel is in a non-bonded state, that is, as a liquid having no cross-linked structure.
- the gels behave as solids for very fast movements and as liquids for very slow movements. This cell.
- Organism, microorganism, carrying the Hyde port gels embedded tissues, etc., or generated during the cutting operation typically, the frequency of the motion is high, greater than about 1 0- 2 sec 1 order
- the hydrogel behaves as a solid, whereas cells, organisms, microorganisms, tissues, and the like move or proliferate in the hydrogel at a low frequency of about 10 Behaves as a liquid for slow motions smaller than 4 sec 1 order. Therefore, cells, organisms, microorganisms, tissues, and the like can move in the hide mouth gel by their running performance.
- the bonding of the cross-linking points to form a three-dimensional network having the above properties The energy is preferably equivalent to the thermal energy (RT) in the physiological temperature range (0 ° C to 40 ° C), and several tens to several hundreds of kca 1 / mo 1 and binding energy
- RT thermal energy
- a three-dimensional network formed by a high covalent bond, a crystallized structure, and a cross-linked structure formed by ionic bonds is unsuitable for the hydrogel of the present invention, and is a bond by dispersive force having a bond energy of several kca 1 / mo 1.
- a three-dimensional network structure formed by hydrogen bonds or hydrophobic bonds can be suitably used as the hydrogel of the present invention.
- a three-dimensional network structure formed by hydrophobic bonds ie, a hydrogel
- a hydrogel has a property that the hydrophobic bonds become stronger with an increase in temperature, so that the sol is gelled at a low temperature and gelled at a high temperature. Therefore, the temperature dependence of the sol-gel transition is opposite to that of a high-opening gel using other bonds, for example, bonds by hydrogen bonding, dispersing force, and the like.
- the physical properties of hydrogels using hydrophobic bonds are higher than those of conventional gels in that they can embed cells and organisms in a low-temperature sol, avoiding thermal damage during embedding.
- the gel of the present invention can be suitably used as the gel for cell / biological fractionation.
- the transition of the hide-opening gel utilizing the hydrophobic bond is thermally reversible, the gel can be dissolved at a low temperature even when the gel is removed from cells and organisms embedded in the gel. Cells and organisms can be recovered from the gel without causing thermal damage.
- FIG. 1 is a schematic perspective view of a preferred embodiment of the present invention.
- FIG. 2 is a schematic perspective view of another preferred embodiment of the present invention.
- BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described more specifically with reference to the drawings as necessary.
- “parts” and “%” representing quantitative ratios are based on mass unless otherwise specified.
- the hydrogel for cell / biological separation (fractionation, fractionation, or separation) of the present invention contains a hydrogel-forming polymer having an sol-gel transition temperature, and the sol state at a lower temperature. It exhibits a thermoreversible sol-gel transition that gels at higher temperatures.
- “cells and organisms” mean “cells and Z or organisms”, and organisms (plants and animals) containing one or more cells as long as they show some chemotaxis to any physiologically active substance. ) Includes or refers to any cell or cell aggregate derived from.
- the forms of the cells and cell aggregates are not particularly limited, and include, for example, single cells, multicellular organisms or organs thereof, microorganisms, sperm, eggs, and the like.
- separation means that the above-mentioned cells and organisms are differentiated in their spatial positions based on any difference in their chemotaxis. In the present invention, this form of “making a difference in spatial position” is not particularly limited.
- “separation” refers to the inside and / or outside of the gel based on the chemotaxis or the chemotaxis corresponding to the physical properties of the cells and / or organisms described above. Any separation operation that can achieve some selectivity in the arrangement of the cells and / or organisms using selective movement between them. “Separation” in the present invention includes, for example, fractionation, fractionation, or fractionation.
- sol state In the present invention, "sol state”, “gel state” and “sol-gel”
- the definition and measurement of the transition temperature is based on the definitions and methods described in the literature (H. Yoshioka et al., Journal of Macromolecular Science, A31 (1), 113 (1994)). That is, the dynamic elastic modulus of a sample at an observation frequency of 1 Hz is measured by gradually changing the temperature from a low temperature side to a high temperature side (1 ° C / 1 minute), and the storage elastic modulus (G,. The temperature at which the elastic term) exceeds the loss modulus (G ", viscous term) is defined as the sol-gel transition temperature.
- the state of G"> G is a sol
- the state of G " ⁇ G ' is a gel.
- the following measurement conditions can be suitably used.
- Measuring equipment (trade name): Stress control type rheometer CSL700, manufactured by Carri_Med
- Applicable stress Within the linear region.
- the above-mentioned Zolgel transition temperature is higher than 0 ° C, preferably 45 ° C or lower, and more preferably 0 ° C or lower. It is preferably 42 ° C or less (especially 4 ° C or more and 40 ° C or less).
- the hydrogel having such a suitable sol-gel transition temperature can be easily selected from the specific compounds as described below according to the above-mentioned screening method (sol-gel transition temperature measurement method).
- Cell / biological separation (fractionation, fractionation) using the hydrogel of the present invention Separation, or fractionation, etc.) the above-mentioned Zolgel transition temperature ( a ° C) is used for cell / biological fractionation, the temperature for fractionation (b ° C), and cooling for fractionation.
- the temperature be set between the temperature at the time (c ° C). That is, it is preferable that the above three temperatures a ° C, b ° C, and c ° C have a relationship of b>a> c. More specifically, (b ⁇ a) is preferably from 1 to 40 ° C., more preferably from 2 to 30 ° C., and (a ⁇ c) is from 1 to 40 ° C., and Is preferably 2 to 30 ° C.
- the hydrogel preferably used in the present invention has a cell selectivity RZR measured by the following assay from the viewpoint of exhibiting a suitable cell selectivity.
- the hydrogel is preferably 2 or more, more preferably 5 or more, and still more preferably 10 or more.
- Cell selectivity RZR Is measured as follows.
- the hydrogel of the present invention exhibits a solid behavior at higher frequencies because cells, organisms, microorganisms, and the like can move freely therein, while it exhibits a solid behavior at lower frequencies. It is preferable to exhibit liquid behavior. More specifically, the mobility of cells, organisms, and the like in the gel for a hide can be suitably measured by the following method. (Method for measuring mobility of cells, organisms, etc. in a gel at the mouth) The hydrogel of the present invention (1 mL as a hydrogel) was tested in a sol state (temperature lower than the sol-gel transition temperature) with an inner diameter of 1 cm.
- T is 1 minute to 24 hours, preferably 5 minutes to 10 hours.
- the gel-like properties of the hydrogel of the present invention can also be suitably measured by measuring the steady-state flow viscosity.
- Steady flow viscosity can be measured, for example, by creep experiments. In the creep experiment, a constant shear stress is applied to the sample, and the time change of the shear strain is observed. Generally, in the creep behavior of a viscoelastic material, the shear rate changes with time at the initial stage, but thereafter, the shear rate becomes constant. The ratio between shear stress and shear rate at this time is defined as steady flow viscosity ⁇ . This steady flow viscosity is sometimes called Newton viscosity. However, the steady flow viscosity here must be determined within a linear region that hardly depends on shear stress.
- a stress control type viscoelasticity measuring device CSL type rheometer (CSL500, manufactured by Carrymed USA) was used as a measuring device, and an acrylic disk was used as a measuring device. (4 cm diameter) Observe the cleaving behavior (delay curve) for a measurement time of at least 5 minutes or more for a thickness of 600 ⁇ m. The sampling time is once every second for the first 100 seconds and once every 100 seconds thereafter.
- the sol - at about 1 0 ° C higher temperature Ri by gel transition temperature is preferably 77 is 5 X 1 0 3 ⁇ 5 X 1 0 6 P a ⁇ sec, more 8 xl 0 3 ⁇ 2 X l 0 6 P a ⁇ sec, in particular l X l 0 4 P a ⁇ sec or more and less l X l 0 6 P a ⁇ sec.
- the gel-like properties of the hydrogel of the present invention can be suitably measured also by the dynamic elastic modulus.
- ⁇ (t) ⁇ Q cos t (where t is time) with an amplitude ⁇ 0 and a frequency ⁇ ⁇ ⁇ , a constant stress ⁇ .
- ⁇ (t) o Q cos ( ⁇ t + ⁇ ), where ⁇ is the phase difference, is obtained.
- ff Q Z o ;.
- the ratio (G "/ G,) is an indicator of gel-like properties.
- the hide mouth gel of the present invention preferably exhibits the following properties (for details of such elastic modulus measurement, refer to, for example, References: Ryohei Oda, Modern Industrial Chemistry) 19, p. 359, Asakura Shoten, 1989).
- the ratio ⁇ (tan ⁇ ) s / (tan ⁇ ) L ⁇ of (tan 5) s to (tan S) L is preferably less than 1 (more preferably 0.8 or less, particularly preferably 0 5 or less) .
- Hydrogel-forming polymer concentration about 8% by mass
- Temperature A temperature approximately 10 ° C higher than the sol-gel transition temperature of the gel at the mouth opening.
- Measuring equipment Stress-controlled rheometer (Model: CSL500, manufactured by Carry Med, USA)
- the hydrogel-forming polymer that can be used in the present invention is not particularly limited as long as it exhibits a thermoreversible sol-gel transition as described above (that is, it has a sol-gel transition temperature). From the point that it is easy to show a suitable sol-gel change at physiological temperature (about 0 to 42 ° C),
- the cloud points of a plurality of blocks having a cloud point and a hydrophilic block, the composition of both blocks, the hydrophobicity of both blocks, and the hydrophilicity It is preferable to adjust the properties, Z, molecular weight, and the like, respectively.
- polystyrene resin whose aqueous solution has a sol-gel transition temperature and exhibits a sol state reversibly at a temperature lower than the transition temperature
- polypropylene oxide and polyethylene oxide include, for example, polypropylene oxide and polyethylene oxide.
- Polyalkylene oxide block copolymers typified by block copolymers of the following; ethylenolide senorelose such as methylcellulose and hydroxypropinolesenorelose; chitosan derivatives (K. R. Holme , et al. Macromolecules, 24, 3828 (1991)) and the like.
- Pluronic F-127 (trade name, manufactured by BASF Wyandotte Chemica Is Co,) in which polyethylene oxide is bonded to both ends of polypropylene oxide as a polyalkylene oxide block copolymer ) Gels are being developed. It is known that this high-concentration aqueous solution of the pull-mouth nick F-127 becomes a gel at a temperature of about 20 ° C or higher and an aqueous solution at a lower temperature. However, in the case of this material, it is about 20 mass 0 /. The gel state can be obtained only at such a high concentration, and even if the gel is maintained at a temperature higher than the gelation temperature at a high concentration of about 20% by mass or more, the gel will be dissolved by adding more water.
- Pluronic F_127 has a relatively small molecular weight, exhibits not only a very high osmotic pressure in a high gel state of about 20% by mass or more, but also easily penetrates cell membranes, so May have adverse effects on biological tissues.
- the sol-gel transition temperature is usually high and is about 45 ° C or higher ( ⁇ Sarkar J. Appl. Polym. Science, 24, 1073, 1979).
- the fractionation and fractionation of cells and organisms are carried out at a temperature of around 37 ° C. or lower, the etherified cellulose is in a sol state, and the etherified cell orifice is in a sol state. It is practically difficult to fractionate and separate cells, organisms, etc. by using the method.
- the problems of the conventional polymer which has a sol-gel transition point in its aqueous solution and shows a sol state reversibly at a temperature lower than the transition temperature are as follows: 1) At a temperature higher than the sol-gel transition temperature. Once gelled, the gel will dissolve when water is further added. 2) The sol-gel transition temperature is higher than the cell / organic fractionation and fractionation temperature (around or below 37 ° C). It is high and it is in a sol state at the fractionation and fractionation temperatures. 3) It is necessary to make the aqueous polymer concentration very high in order to gel.
- a hydrogel-forming polymer having an sol-gel transition temperature of preferably higher than 0 ° C. and not higher than 42 ° C.
- a constant block having a cloud point and a hydrophilic block are combined, and the aqueous solution has a sol-gel transition temperature and reversibly forms a sol at a temperature lower than the sol-gel transition temperature.
- the hydrogel-forming polymer utilizing a hydrophobic bond which can be suitably used as a base for separation (fractionation, fractionation, or fractionation, etc.) of cells and organisms of the present invention, comprises a plurality of polymers having a cloud point. It is preferable that this block is combined with a hydrophilic block.
- the hydrophilic block exists because the hydrogel becomes water-soluble at temperatures below the sol-gel transition temperature.
- the plurality of blocks having a cloud point are present because the hydrogel changes to a gel state at a temperature higher than the sol-gel transition temperature.
- a block having a cloud point dissolves in water below the cloud point and becomes insoluble in water above the cloud point, so that at a temperature above the cloud point,
- the blocks serve as cross-linking points consisting of hydrophobic bonds to form a gel. That is, the cloud point derived from the hydrophobic bond corresponds to the sol-gel transition temperature of the hydrogel.
- the cloud point and the sol-gel transition temperature do not necessarily have to match. This is because the cloud point of the “block having a cloud point” described above is generally affected by the binding between the block and the hydrophilic block.
- the hydrogel used in the present invention utilizes the property that the hydrophobic bond not only becomes stronger with an increase in temperature, but that the change is reversible with respect to temperature. Multiple crosslinking points are formed in one molecule
- the hydrogel-forming polymer has a plurality of “blocks having a cloud point” in the molecule.
- the hydrophilic block in the hydrogel-forming polymer becomes water-soluble at a temperature lower than the sol-gel transition temperature, as described above. It has a function of changing the water-containing gel while preventing the above-mentioned gel at the high temperature from being excessively increased at a temperature higher than the above-mentioned transition temperature, thereby preventing the above-mentioned gel of the mouth from being aggregated and precipitated. .
- the block having a cloud point is preferably a block of a polymer having a negative temperature coefficient of solubility in water, and more specifically, polypropylene block, propylene block, and the like.
- Copolymers with other alkylenoxides poly N-substituted acrylamide derivatives , A poly-N-substituted metaacrylamide derivative, a copolymer of an N-substituted acrylamide derivative and an N-substituted metaacrylamide derivative, polyvinyl methyl ether, or a partially acetylated polybutyl alcohol.
- Molecules can be used preferably.
- the above polymer (block having a cloud point) has a cloud point of higher than 4 ° C and not higher than 45 ° C depends on the polymer (a plurality of blocks having a cloud point and hydrophilicity) used in the present invention.
- the sol-gel transition temperature of the compound having a hydrophilic block bonded thereto is set to be higher than 4 ° C and 40 ° C or lower.
- the cloud point is measured, for example, by cooling an aqueous solution of about 1% by weight of the above-mentioned polymer (block having a cloud point) into a transparent homogeneous solution, and then gradually increasing the temperature (heating). This can be done by setting the point at which the solution becomes cloudy for the first time as the cloud point at a rate of about 1 ° C / in).
- poly N-substituted acrylamide derivatives and poly N monosubstituted meta acrylamide derivatives that can be used in the present invention are listed below.
- the polymer may be a homopolymer (a homopolymer) or a copolymer of a monomer constituting the polymer and another monomer.
- a copolymer any of a hydrophilic monomer and a hydrophobic monomer can be used.
- copolymerization with a hydrophilic monomer raises the cloud point of the product, and copolymerization with a hydrophobic monomer lowers the cloud point of the product. Therefore, by selecting these monomers to be copolymerized, A polymer having a cloud point of (for example, a cloud point higher than 4 ° C and 45 ° C or less) can be obtained.
- hydrophilic monomers examples include N-bulpyrrolidone, bulpyridine, acrylamide, metaacrylamide, N-methylacrylamide, hydroxysethylmetarate, and hydroxylethyl acrylate.
- Acid hydroxymethyl methacrylate, hydroxymethyl acrylate, acrylic acid having an acidic group, metaacrylic acid and salts thereof, vinyl sulfonic acid, styrene sulfonic acid, etc., and a basic group.
- the hydrophobic monomers include acrylate derivatives, methacrylate derivatives such as ethyl acrylate, methyl methacrylate, and glycidyl methacrylate, and N-n Examples include, but are not limited to, N-substituted alkyl methacrylamide derivatives such as butyl methacrylamide, butyl chloride, acrylonitrile, styrene, butyl acetate and the like.
- hydrophilic blocks to be combined with the above-mentioned block having a cloud point include, specifically, methylcellulose, dextran, poly (ethylene oxide), polyvinyl alcohol, poly-N— Bierpi mouth lidone, polyvinyl pyridine, polyacrylamide, polymethacrylinoleamide, poly N-methylacrylamide, polyhydroxymethyl acrylate, polyacrylic acid, polymethacrylic acid, polyvinyl acid Sulfonic acid, polystyrene sulfonic acid and their salts; poly N, N-dimethylaminoethyl methacrylate, poly N, N-ethylaminoethyl methacrylate, poly N, N-dimethylamino propylacrylamide and their salts And the like.
- the method for bonding the block having a cloud point and the hydrophilic block is not particularly limited.
- a polymerizable functional group for example, acryloyl
- copolymerizing a monomer that gives the other block for example, acryloyl
- a combination of a block having a cloud point and the above-described hydrophilic block is a monomer that provides a block having a cloud point and a monomer that provides a hydrophilic block. It can also be obtained by block copolymerization with
- a functional group for example, a hydroxyl group, an amino group, a carboxy group, an isocyanate group, etc.
- a functional group for example, a hydroxyl group, an amino group, a carboxy group, an isocyanate group, etc.
- it can also be carried out by combining the two by a chemical reaction. At this time, usually, a plurality of reactive groups are introduced into the hydrophilic block.
- a bond between a polypropylene having a cloud point and a hydrophilic block can be formed by, for example, anion polymerization or cationic polymerization, a monomer (which constitutes another hydrophilic block) with propylene oxide.
- ethylene oxide eg, ethylene oxide
- a block copolymer in which polypropylene oxide and “hydrophilic block” (eg, polyethylene oxide) are bonded can be obtained.
- Such a block copolymer can be obtained by introducing a polymerizable group (for example, an atalyloyl group) into the end of polypropylene propylene and then copolymerizing the monomers constituting the hydrophilic block.
- polypropylene oxide in a hydrophilic block can also be obtained by introducing a functional group capable of binding and reacting with a terminal functional group (for example, a hydroxyl group) and reacting both.
- the polymer of the present invention in the embodiment containing the block having the cloud point has a structure in which, at a temperature lower than the cloud point, the “block having the cloud point” existing in the molecule is a hydrophilic block. Since both are water-soluble, they dissolve completely in water and show a sol state. However, when the temperature of the aqueous solution of the polymer is heated to a temperature higher than the above cloud point, the “block having a cloud point” existing in the molecule becomes hydrophobic, and the hydrophobic interaction causes the interaction between the separate molecules. Meet. On the other hand, since the hydrophilic block is still water-soluble at this time (when heated to a temperature higher than the cloud point), the polymer of the present invention is used in water between blocks having a cloud point.
- the sol-gel transition of the polymer of the present invention in a preferred embodiment is based on the reversible change in hydrophilicity and hydrophobicity at the cloud point of a block having a cloud point present in the molecule. Therefore, it is completely reversible in response to temperature changes.
- the hydrogel of the present invention which contains at least water, is substantially insoluble in water at a temperature higher than the sol-gel transition temperature (cJ ° C) and reversibly water-soluble at a temperature lower than the sol-gel transition temperature (e ° C). Shows solubility.
- the above-mentioned high temperature (d ° C) is preferably 1 ° C or more, more preferably 2 ° C or more (particularly 5 ° C or more) higher than the sol-gel transition temperature.
- substantially water-insoluble means that the amount of the polymer dissolved in 100 mL of water at the temperature (d ° C.) is 5 • 0 g or less (further, 0.5 g Hereinafter, it is particularly preferable to be 0.1 lg or less.
- the above low temperature (e ° C) is preferably 1 ° C or more (in absolute value) lower than the sol-gel transition temperature, and more preferably 2 ° C or more (particularly 5 ° C or more). More preferably, it is.
- water-soluble means that the amount of the polymer soluble in 100 mL of water at the temperature (e ° C.) is 0.5 g or more (furthermore, 1.0 g or more). It is preferable that Further, "reversibly water-soluble” means that the aqueous solution of a polymer having a gel structure at the mouth opening is once gelled (at a temperature higher than the sol-gel transition temperature), and the sol-gel transition temperature is high. At lower temperatures, the above water solubility is observed.
- the above polymer preferably has a viscosity of 10 to 30000 centivoise (more preferably 50 to 10000 centivoise) at a 10% aqueous solution at 5 ° C. Such a viscosity is preferably measured, for example, under the following measurement conditions.
- Viscometer Stress-controlled rheometer (model name: CSL500, manufactured by Carry Med, USA)
- Rotor diameter 60 mm
- Rotor shape Parallel plate Measurement frequency: 1 Hz (Hertz)
- the aqueous solution of the hydrogel-forming polymer of the present invention is the sol-gel After gelling at a temperature higher than the transition temperature, even if the gel is immersed in a large amount of water, the gel does not substantially dissolve.
- the above characteristics of the substrate for separation (fractionation, fractionation, or fractionation, etc.) of the above-mentioned cells and organisms can be confirmed, for example, as follows. That is, 0.15 g of the hydrogel-forming polymer of the present invention is dissolved in 1.35 g of distilled water at a temperature lower than the above sol-gel transition temperature (for example, under ice cooling) to obtain 10 W.
- Aqueous solution was prepared, and the aqueous solution was poured into a plastic Petri dish having a diameter of 35 mm, and heated to 37 ° C, whereby a gel having a thickness of about 1.5 mm was placed in the Petri dish. After formation, the weight (f gram) of the whole petri dish containing the gel is measured. Next, the whole petri dish containing the gel was allowed to stand at 37 ° C. for 10 hours in water in 250 mL, and then the weight (g gram) of the whole petri dish containing the gel was measured. The presence or absence of dissolution of the gel from is evaluated.
- the weight loss rate of the gel is preferably 5.0% or less, more preferably 1.0%. It is preferably at most 0.1%.
- the aqueous solution of the hydrogel-forming polymer of the present invention is gelled at a temperature higher than the above-mentioned sol-gel transition temperature, and then becomes a large amount (about 0.1 to 100 times the volume of gel). Even if immersed in water, the gel does not dissolve for a long time.
- Such properties of the polymer used in the present invention are achieved, for example, by the presence of two or more (multiple) blocks having a cloud point in the polymer.
- the above-mentioned pull-out nick F in which polyethylene oxide is bonded to both ends of polypropylene oxide, is used.
- the present inventors have found that when a similar gel is prepared using —127, the gel dissolves completely in water after standing for several hours.
- the concentration in water that is, ⁇ (polymer) / (polymer + water) ⁇ XI It is preferable to use a hydrogel-forming polymer capable of gelling at a concentration of 0% (%) and 20% or less (more preferably 15% or less, particularly 10% or less).
- the physiologically active substance in the present invention refers to a substance that binds, reacts, or attracts cells or organisms.
- Examples include chemotactic factors (chemotaxis factors), antibodies, cytokines and their receptors, cell adhesion factors, and the like.
- Chemotaxis is a property in which a cell or microorganism accumulates or escapes according to the concentration ⁇ when a concentration difference of a certain chemical substance (chemotaxis factor) stimulates.
- Chemotaxis is a property possessed by many cells such as microorganisms, leukocytes, cancer cells, and sperm. Microorganisms and cell organisms each have the ability to recognize specific chemotactic factors.
- typical chemotactic factors include neutrophils, immunoglobulin-derived factors that act on macrophages, and other complement-derived factors that act on neutrophils, such as C3a, C5a, and N—Horminore et al.
- lymphokine which is a lymphocyte-derived factor that acts on macrophages, peptidic factors that act on eosinophils, ekalectin, and the like. These are chemotactic factors for immunocompetent cells involved in allergic reactions.
- vascular endothelial cell growth factor related to blood vessel induction and regeneration various cell growth factors such as vascular endothelial cell growth factor related to blood vessel induction and regeneration, and neural network induction and regeneration related nerve cell growth factor are also considered to be chemotactic factors.
- the vascular system is also induced and regenerated by the gradient of oxygen concentration, and oxygen is known to be a negative chemotactic factor.
- Chemotactic factors have also been implicated in the metastasis of cancer cells.
- immune-related and cancer-related drugs that act directly on cells can be considered to have chemotaxis in many cases. (Physiotaxis factor)
- Physical chemotaxis is a property in which cells or microorganisms gather or escape according to the difference in intensity when a difference in the intensity of a certain physical factor serves as a stimulus.
- Physotaxis is a property of many microbial cells, each of which has the ability to recognize specific motility factors.
- typical physical chemotaxis factors are electric field, magnetic field, gravitational field, luminous intensity, temperature, viscosity, etc.
- the chemoattractant is a cell attracting ability NZN measured on the target cell by the following measurement method. Is preferably at least 1.2, more preferably at least 2, and even more preferably at least 10 chemotactic factors.
- the cell attraction ability can be measured, for example, as follows.
- the hydrogel-forming polymer (TGP-5) lg of the present invention obtained in Production Example 8 described below was dissolved at 4 ° C in 9 g of physiological saline containing a chemotactic factor to form the hydrogel of the present invention.
- the concentration of the chemoattractant in the aqueous solution of the hydrogel-forming polymer must be set within a range that attracts the target cells, and is usually from 10 to 6 M to 10 to 5 M. Range. 1 g of this aqueous solution is heated to 37 ° C. to form a hydrogel having a surface area of 10 to 15 cm 2 (S / V ratio: 10 to 15).
- the aqueous solution was filled into a 23 mL 1-mL syringe equipped with an injection needle and cooled to 4 ° C. Extrude in 10 seconds. At this time, the diameter of the narrow hydrogel obtained is about 3 mm and the length is about 14 cm, so that a hydrogel having a surface area of about 13 cm 2 can be obtained.
- the high Dorogeru 1 g of S ⁇ V ratio 1 0-1 5 comprising said chemotactic factor 1 0- 6 M to 1 0- 5 M, a suspension of cells of interest (cell count: 1 0 6 / ml) to 1 Contact in a 4 mL disposable centrifuge tube and gently spin at 37 ° C for 4 hours.
- the cell suspension is removed by decantation while leaving the hydrogel, and 10 mL of a 37 ° C saline solution is newly added to wash and remove the cells adhering to the surface of the gel at the opening. After repeating the washing operation three times, the mixture is cooled to 4 ° C. to dissolve the hydrogel, and the number N of cells migrated into the hydrogel is measured. On the other hand, the same measurement as described above was performed for the hydrogel of the present invention containing no chemotactic factor, and the number of cells N migrated into the hydrogel was determined. Measure NZN. Ask for.
- a concentration gradient of the physiologically active substance is formed, and cells and organisms that have been substantially uniformly distributed in the hydrogel according to the concentration gradient are subjected to various portions in the gel at the mouth due to differences in chemotactic performance.
- a physiologically active substance is uniformly mixed with an aqueous solution of a gel-forming polymer in a sol state, and the mixture in the sol state is heated to a temperature higher than the sol-gel transition temperature to a predetermined temperature. Hydrogel with shape Then, the cell / organism is brought into contact with a suspension of cells / organisms at a temperature higher than the sol-gel transition temperature to transfer the cells / organisms into a hydrogel of a predetermined shape.
- FIG. 1 schematically shows an embodiment of the present invention according to the above methods 1) and 2)
- FIG. 2 schematically shows an embodiment according to the above method 3).
- Which of the above methods is adopted may be appropriately selected depending on the type of the target cell and the organism.
- the shape of the hydrogel may be appropriately selected according to the purpose, and may be any shape such as a column, a disk, a rectangular parallelepiped, a sphere, a thin string, a fiber, a flake, a plate, a film, and an irregular shape. be able to.
- the hydrogel containing the physiologically active substance is used to increase the frequency of contact with the cells in the cell suspension placed around the hydrogel. It is advantageous to increase the surface area per unit volume for the given shape given to the surface, and it is desirable to use any of spherical, thin, fiber, flake, plate, film, and irregular shapes . It is preferable that the predetermined shape given to the gel with a mouth opening is a shape having a surface area (S) / volume (V) ratio of at least 10 (cm ⁇ ), particularly at least 30 (cm- 1 ). More preferably, it is 60 (cm- 1 ) or more.
- the method 3 it is preferable to agitate or circulate the cell suspension in order to increase the frequency of contact between the hydrogel and the cells in the cell suspension disposed around the hydrogel.
- a number of sets of the hydrogel and the cell suspension arranged around it can be processed in parallel. At this time, by changing the concentration of the chemotactic factor in the gel of the hydrogel in each set, or by changing the contact time between the hydrogel of each set and the cell suspension, the target cells and organisms can be obtained. It can be fractionated and collected.
- IMLP N-forinyl-methionyl-leucyl-phenylalanine: molecular weight 437.6, chemotactic peptides, LPS (Lipopolysaccharide), etc. are known as chemotactic factors for leukocytes (neutrophils).
- LPS Lipopolysaccharide
- chemotactic factors for leukocytes neurotrophils
- a concentration gradient of these chemotactic factors is formed in the hydrogel of the present invention and brought into contact with a cell group containing leukocytes (for example, peripheral blood), the chemotaxis induced by these chemoattractants is generated.
- High and low cells are separated in the hydrogel according to the concentration of the chemoattractant in the gel.Then, the portion of the gel where the target cells are present is cut out and cooled, and the cells are cooled. Drogel is converted into a sol, diluted with physiological saline or the like, and only the target cells can be collected by a method such as centrifugation.
- a low-temperature sol-state aqueous hydrogel solution of the present invention When it is desired to collect a large amount of cells having affinity for iMLP or LPS from blood, these chemotactic factors are dissolved in a low-temperature sol-state aqueous hydrogel solution of the present invention.
- the solution is dropped into physiological saline at a temperature higher than the gel transition temperature to gel in the form of microdroplets, and the small hydrogel of the present invention containing this chemotactic factor is heated to a temperature higher than the sol-gel transition temperature. Keep at temperature and recover from saline and disperse it in blood.
- the mixture is stirred at a temperature higher than the sol-gel transition temperature as it is, only cells having an affinity for fMLP or LPS are taken into the hydrogel of the present invention in the form of microdroplets.
- the hydrogel of the present invention in which cells have been taken in while maintaining the temperature higher than the sol-gel transition temperature, is collected by centrifugation, and washed. Thereafter, the gel of the present invention in which the cells were taken in at a temperature lower than the transition temperature was formed into a sol, diluted with physiological saline or the like, and further washed repeatedly to remove the hydrogel of the present invention. Collect cells.
- the feature of this method is that only the cells in the cell suspension
- the hydrogel of the present invention containing a chemotactic factor can move freely, and the size and shape of the gel of the present invention can produce a very high surface area per unit amount. Thus, high frequency contact between the cells and the hydrogel of the present invention can be expected.
- by encapsulating various chemotactic factors in the hydrogel of the present invention, or by changing the conditions such as time and temperature functional recovery in a small and multiplex type can be expected.
- pluripotent hematopoietic stem cells are contained in CD34 positive cells among hematopoietic cells, and CD34 positive in hematopoietic cells of transplant donors.
- the rate has been used as one of the evaluations of hematopoietic stem cell transplantation.
- CD34-positive cells cells that have the ability to migrate to chemokines, such as the chemokine receptor CXCR-4 ligand Stromal cell lder ived fact or-1 (SDF-l), have been transplanted.
- SDF-l Stromal cell lder ived fact or-1
- the hide-mouth gel of the present invention containing SDF-1 is used to evaluate reactivity to SDF_1 in CD34-positive cells and to separate cells that react with SDF-1.
- CD34-positive cells were separated by magnetic bead method from hematopoietic cells collected from the bone marrow fluid, peripheral blood, or cord blood of the donor, and SDF-1 was added to the CD34-positive cell suspension.
- the contained gel of the present invention is co-suspended and cultured with stirring for a certain period of time, and CD34-positive cells that have entered the gel of the present invention in response to SDF-1 are separated and recovered.
- the recovery indicates the percentage of SDF-1 reactive cells, and it is expected that the homing activity of the donor cells can be evaluated.
- the vesicles can be directly transplanted as hematopoietic stem cells having high-homing activity.
- Sperm is a cell specialized for fertilization. It is the only cell in the life of an organism that has flagella and exhibits a sophisticated motor function, chemotaxis. This chemotaxis enables fertilization.
- the hydrogel of the present invention is used to utilize only sperm having high migration ability based on chemotaxis for fertilization with an egg cell. After washing the collected semen, the spermatozoa are caused to float in a small amount of the hydrogel of the present invention in a sol state, and gelled as it is at a temperature higher than the sol-gel transition temperature.
- the periphery of the microgel-like hide mouth gel of the present invention containing the spermatozoa is covered with a hydrogel of the present invention in an appropriate amount prepared separately and at an appropriate concentration.
- the amount and concentration of the outer hydrogel of the present invention is such that only sperm having a high migratory ability can move inside the mebiol gel, and can be transferred from the hydrogel of the present invention within a certain period of time. Adjust so that it comes out of the suspension.
- the hydrogel of the present invention containing sperm is suspended at a temperature higher than its sol-gel transition temperature in a plastic petri dish in which egg cells are placed in a culture solution.
- Polypropylene Oxido-Polyethylene Oxide Copolymer (Propylene Oxide Z Ethylene Oxide Average Degree of Polymerization Approximately 60 Z180, manufactured by Asahi Denka Kogyo Co., Ltd .: Pull Mouth F-127) 1 0 g was dissolved in 30 mL of dry clog form, 0.13 g of hexamethylene diisocyanate was added in the presence of phosphorus pentoxide, and the mixture was reacted at the boiling point of reflux for 6 hours.
- the residue was dissolved in distilled water, and subjected to ultrafiltration using an ultrafiltration membrane (Amicon PM-30) having a molecular weight cut off of 30,000 to obtain a high molecular weight polymer and a low molecular weight polymer.
- the coalescence was fractionated.
- the obtained aqueous solution was frozen to obtain an F-127 high polymer and an F-127 low polymer.
- the F_127 high polymer (the hydrogel-forming polymer of the present invention, TGP-1) obtained as described above was dissolved in distilled water at a concentration of 8% by mass under water cooling.
- TGP-1 the hydrogel-forming polymer of the present invention
- poly (ethylene oxide) triol having an average molecular weight of about 700,000.
- N-isopropyl acrylamide (manufactured by Eastman Kodak Co., Ltd.) 96 g, N-attaliroxysuccinimide (manufactured by Kokusan Chemical Co., Ltd.) 17 g, and n-butyl methacrylate (Kanto Chemical Co., Ltd.) 7 g) was dissolved in 400 ml of black form, and after purging with nitrogen, 1.5 g of N, N, azobisisobutyl-to-trile was added and polymerized at 60 ° C for 6 hours. Let me do. After the reaction solution was concentrated, it was reprecipitated (reprecipitated) in getyl ether.
- the solids are collected by filtration, dried in vacuo, and dried with 78 g of poly (N-isopropylacrylamide) _N_atalyloxysuccinimide-co- n -butylmethylacrylate Rate).
- the solid matter After collecting the solid matter by filtration, the solid matter is vacuum-dried, and the poly (N-isopropylacrylyl amidodo-n-butyl methacrylate) of the present invention in which a plurality of poly (N-isobutylacrylamide) and polyethylene oxide are combined.
- An oral gel-forming polymer (TGP_3) was obtained.
- the TGP-3 thus obtained was dissolved in distilled water at a concentration of 5% by mass under ice-cooling, and its sol-gel transition temperature was measured to be about 21 ° C.
- TGP_3 2.0 g of the above-described gel-forming polymer of the present invention (TGP_3) was placed in an EOG (ethylene oxide gas) sterilization bag (manufactured by Hogi Medical Co., Ltd., trade name: Hybrid sterilization bag).
- EOG ethylene oxide gas
- the bag was filled with EOG using an EOG sterilizer (Easy Pack, manufactured by Inuchi Seieido) (EOG concentration: about 900 mg / L), and left at room temperature for 24 hours. After leaving at 40 ° C. for half a day, the EOG was removed from the bag and air-sealed.
- the bags were placed in a vacuum dryer (40 ° C) and sterilized by leaving them for half a day with occasional air-rate.
- the precipitate was dissolved again in 6 L of distilled water to obtain a hollow fiber filter having a molecular weight cut off of 100,000.
- the solution was concentrated to 2 L at 10 ° C using a type ultrafiltration membrane (H1P100-43, manufactured by Amicon).
- the concentrated solution was diluted by adding 4 L of distilled water, and the dilution operation was repeated.
- the above dilution and ultrafiltration / concentration operations were further repeated five times to remove those having a molecular weight of 100,000 or less.
- the substance not filtered by the ultrafiltration (remaining in the ultrafiltration membrane) is collected, freeze-dried, and formed into a hydrogel-forming polymer (TGP-) of the present invention having a molecular weight of 100,000 or more. 4) 60 g was obtained.
- Ig of the hydrogel-forming polymer (TGP-4) of the present invention obtained as described above was dissolved in 9 g of distilled water under ice cooling.
- the sol-gel transition temperature of this aqueous solution was measured, the sol-gel transition temperature was found to be 25.
- the hide-mouth gel-forming polymer (TGP-3) of the present invention of Production Example 3 was dissolved in distilled water at a concentration of 1 °% by mass, and ⁇ at 37 ° C. was measured. 0 5 Pa ⁇ sec.
- agar was dissolved in distilled water at a concentration of 2% by mass at 90 ° C, gelled at 10 ° C for 1 hour, and J at 37 ° C was measured. Is a device measurement It was over the limit (l X l 0 7 P a ⁇ sec).
- the concentrated solution was diluted by adding 4 L of cold distilled water, and the ultrafiltration and concentration operation was performed again. The above dilution and ultrafiltration / concentration operations were further repeated 5 times to remove those having a molecular weight of 100,000 or less.
- the substance not filtered by the ultrafiltration (the substance remaining in the ultrafiltration membrane) is collected, frozen and dried, and the hydrogel-forming polymer of the present invention having a molecular weight of 100,000 or more (TGP-5) 72 g were obtained.
- the concentrated solution was diluted by adding 4 L of cold distilled water, and the ultrafiltration and concentration operation was performed again. The above dilution and ultrafiltration / concentration operations were further repeated 5 times to remove those having a molecular weight of 100,000 or less.
- the polymer not filtered by the ultrafiltration (remaining in the ultrafiltration membrane) is collected, freeze-dried, and subjected to the hydrogel-forming polymer of the present invention having a molecular weight of 100,000 or more (TGP-6). ) 40 g were obtained.
- the concentrated solution was diluted by adding 4 L of cold distilled water, and the ultrafiltration and concentration operation was performed again. The above dilution and ultrafiltration / concentration operations were further repeated 5 times to remove those having a molecular weight of 100,000 or less.
- the material not filtered by the ultrafiltration (remaining in the ultrafiltration membrane) is collected, freeze-dried, and subjected to the hydrogel-forming polymer of the present invention having a molecular weight of 100,000 or more (TGP-7 ) 22 g were obtained.
- Ig of the hydrogel-forming polymer (TGP-7) of the present invention obtained as described above was dissolved in 9 g of distilled water under ice-cooling.
- the sol-gel transition temperature of this aqueous solution was measured, the sol-gel transition temperature was found to be 37.
- the hydrogel-forming polymer (TGP-5) of the present invention obtained in Production Example 8 was sterilized by E0G in the same manner as in Production Example 4, and its lg was 9 g 'D'MEM medium at 4 ° C, 0.5 ml each (about 0.5 mm thick) was injected onto the above soft agar gel and gelled at room temperature .
- the sol-gel transition temperature of this hydrogel was 18 ° C. And border the 8.
- the sedimented cells were resuspended in 20 ⁇ L of physiological saline, the number of cells was counted, and the number of neutrophils transferred into the hydrogel of the present invention was measured. Further, after removing the hydrogel of the present invention, the number of cells transferred to soft agar was observed under a microscope, and the results are summarized in Table 1.
- the hydrogel-forming polymer (TGP-I5) of the present invention obtained in Production Example 8 was sterilized by EOG in the same manner as in Production Example 4, and its lg was changed to 9 g of D. And MEM medium (Dulbecco's Modification Eagle's Medium, GIBCO, containing 10% Fetal Calf Serum) under ice-cooling.
- MEM medium Dulbecco's Modification Eagle's Medium, GIBCO, containing 10% Fetal Calf Serum
- fMLP was dissolved at 4 ° C in D, MEM medium of the above-mentioned gel-forming polymer (TGP-5) (concentration: 1 CT 6 M).
- This fMLP-containing high-mouth gel-forming polymer (TGP-5) D'MEM medium was placed in a 23 mL 1-mL syringe with an injection needle, and cooled to 4 ° C. 1 mL of this 4 ° C aqueous solution was extruded into 10 mL of phosphate buffered saline (PBS) at 37 ° C in a disposable centrifuge tube (Falcon, 14 mL). Then, a string-like hydrogel was formed.
- PBS phosphate buffered saline
- the gel was cooled to 4 ° C to form a string-shaped gel with a sol, diluted with PBS and washed by centrifugation to prepare a light-Giemsa stained sample of the cells taken up in the gel and observed under a microscope.
- fMLP erythrocytes and platelets
- Example 2 The same experiment as in Example 2 was performed, except that f MLP was not contained in the hydrogel.
- f MLP was not contained in the hydrogel.
- hydrogel capable of separating (fractionating, fractionating or sorting, etc.) cells and organisms having various running performances.
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/545,935 US20060121116A1 (en) | 2003-02-19 | 2004-02-19 | Hydrogel for cell separation and method of separating cells |
JP2005502753A JPWO2004074463A1 (ja) | 2003-02-19 | 2004-02-19 | 細胞分離用ハイドロゲルおよび細胞の分離方法 |
CA002516592A CA2516592A1 (en) | 2003-02-19 | 2004-02-19 | Hydrogel for separating cell and method of separating cell |
EP04712684A EP1595944A4 (en) | 2003-02-19 | 2004-02-19 | HYDROGEL FOR CELL SEPARATION AND CELL SEPARATION METHOD |
US11/907,110 US20080213869A1 (en) | 2003-02-19 | 2007-10-09 | Hydrogel for separating cell and method of separating cell |
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PCT/JP2004/001856 WO2004074463A1 (ja) | 2003-02-19 | 2004-02-19 | 細胞分離用ハイドロゲルおよび細胞の分離方法 |
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US (2) | US20060121116A1 (ja) |
EP (1) | EP1595944A4 (ja) |
JP (1) | JPWO2004074463A1 (ja) |
CA (1) | CA2516592A1 (ja) |
WO (1) | WO2004074463A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008107210A (ja) * | 2006-10-25 | 2008-05-08 | Mebiol Kk | 好中球機能検査システムおよび好中球機能検査方法 |
CN113980325A (zh) * | 2021-09-15 | 2022-01-28 | 苏州市立医院(北区) | 一种可提高中性粒细胞趋化效率的凝胶制备方法 |
Families Citing this family (3)
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KR100624450B1 (ko) * | 2004-12-10 | 2006-09-18 | 삼성전자주식회사 | 히드로겔을 이용한 생물분자의 분리 및 정제 방법 |
CA2932542C (en) * | 2012-12-14 | 2023-06-06 | The Regents Of The University Of California | Viral vector nanocapsule for targeting gene therapy and its preparation |
US20230310609A1 (en) * | 2020-08-21 | 2023-10-05 | Virginia Polytechnic Institute And State University | Injectable hydrogels and methods of capturing cells using the same |
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- 2004-02-19 EP EP04712684A patent/EP1595944A4/en not_active Withdrawn
- 2004-02-19 JP JP2005502753A patent/JPWO2004074463A1/ja active Pending
- 2004-02-19 WO PCT/JP2004/001856 patent/WO2004074463A1/ja active Application Filing
- 2004-02-19 US US10/545,935 patent/US20060121116A1/en not_active Abandoned
- 2004-02-19 CA CA002516592A patent/CA2516592A1/en not_active Abandoned
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2007
- 2007-10-09 US US11/907,110 patent/US20080213869A1/en not_active Abandoned
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JPH0823956A (ja) * | 1994-07-12 | 1996-01-30 | Matsushita Electric Ind Co Ltd | 濃度勾配生成装置及びその製造方法 |
GB2314035A (en) * | 1995-02-21 | 1997-12-17 | Mini Agriculture & Fisheries | Dielectrophoresis |
US5733736A (en) * | 1996-12-16 | 1998-03-31 | Springfield College | Motility channel pathogen detector and method of use |
JPH11276156A (ja) * | 1998-03-31 | 1999-10-12 | Mitsubishi Electric Corp | 生細胞計測方法 |
WO2000007007A1 (en) * | 1998-07-28 | 2000-02-10 | Biometric Imaging, Inc. | Device and method for cell motility assay |
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JP2000262865A (ja) * | 1999-03-15 | 2000-09-26 | Matsushita Electric Ind Co Ltd | 細菌濃縮装置 |
JP2001017156A (ja) * | 1999-07-07 | 2001-01-23 | Matsushita Electric Ind Co Ltd | 微生物濃度濃縮装置および微生物濃度濃縮方法 |
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JP2008107210A (ja) * | 2006-10-25 | 2008-05-08 | Mebiol Kk | 好中球機能検査システムおよび好中球機能検査方法 |
CN113980325A (zh) * | 2021-09-15 | 2022-01-28 | 苏州市立医院(北区) | 一种可提高中性粒细胞趋化效率的凝胶制备方法 |
Also Published As
Publication number | Publication date |
---|---|
CA2516592A1 (en) | 2004-09-02 |
EP1595944A4 (en) | 2006-02-22 |
US20060121116A1 (en) | 2006-06-08 |
US20080213869A1 (en) | 2008-09-04 |
EP1595944A1 (en) | 2005-11-16 |
JPWO2004074463A1 (ja) | 2006-06-01 |
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