US20150259643A1 - Cell Preparation Method - Google Patents
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- US20150259643A1 US20150259643A1 US14/727,037 US201514727037A US2015259643A1 US 20150259643 A1 US20150259643 A1 US 20150259643A1 US 201514727037 A US201514727037 A US 201514727037A US 2015259643 A1 US2015259643 A1 US 2015259643A1
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- hepatocytes
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/06—Animal cells or tissues; Human cells or tissues
- C12N5/0602—Vertebrate cells
- C12N5/067—Hepatocytes
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N1/00—Preservation of bodies of humans or animals, or parts thereof
- A01N1/02—Preservation of living parts
- A01N1/0205—Chemical aspects
- A01N1/021—Preservation or perfusion media, liquids, solids or gases used in the preservation of cells, tissue, organs or bodily fluids
- A01N1/0221—Freeze-process protecting agents, i.e. substances protecting cells from effects of the physical process, e.g. cryoprotectants, osmolarity regulators like oncotic agents
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N1/00—Preservation of bodies of humans or animals, or parts thereof
- A01N1/02—Preservation of living parts
- A01N1/0278—Physical preservation processes
- A01N1/0284—Temperature processes, i.e. using a designated change in temperature over time
Definitions
- the field of the invention generally relates to novel methods for the preparation of cryopreserved hepatocytes, in particular, isolated liver parenchymal cells (hepatocytes).
- hepatocytes The parenchymal cells of the liver, generally called hepatocytes, are the major cell types responsible for drug metabolism and are the cells damaged by hepatotoxicants. These cells therefore represent a desirable experimental system for the evaluation of drug metabolism and hepatotoxicity.
- hepatocytes There are numerous scientific publications on such application of hepatocytes in drug development.
- a major problem with drug development is that a large number of drug candidates would fail in the clinic due to nonefficacy or adverse effects, even though drug candidates chosen for clinical trials are selected after extensive research in preclinical studies using laboratory animals and are found to have acceptable efficacy and safety.
- One of the major reasons is species differences, namely, that human drug effects may not always be the same as that found in laboratory animals.
- a drug can be toxic to humans and not to laboratory animals if the toxicity is caused by metabolites that are formed only in humans. Conversely, a drug can be toxic to animals but not in humans if the toxic metabolites are animal specific and are not formed in human.
- the use of hepatocytes is further made practical by successes in cryopreservation.
- Cryopreserved hepatocytes allow scientists to perform studies with hepatocytes simply by thawing and using the cells, avoiding the time-consuming isolation procedures.
- Cryopreserved hepatocytes, both from animals and humans, are now available commercially for use in research.
- a typical procedure to thaw, pool, and re-freeze hepatocytes requires dilution of the cryopreservation medium followed by centrifugation through a high density medium to enrich for viable cells before the second freezing. These can be a laborious procedure.
- a method for the preparation of cryopreserved hepatocytes pooled from previously cryopreserved cells is described.
- the novelty of the method is the thawing, pooling and re-cryopreservation of the hepatocytes without the conventional procedures of firstly dilution of the cryopreserving medium and enrichment of viable cells by iso-density centrifugation.
- the method involves cryopreserving human hepatocytes from livers of multiple individuals in hepatocyte suspension media in separate vessels for each of the multiple individuals, thawing the vessels of the hepatocytes from multiple individuals in a bath, pooling the thawed hepatocytes from the separate vessels of the multiple individuals in a container, distributing the pooled hepatocytes into multiple vessels, and cryopreserving the multiple vessels of pooled hepatocytes.
- previously cryopreserved hepatocytes isolated from individual donors are stored in liquid nitrogen or a freezer maintained at approximately ⁇ 150 degrees Celsius (° C.).
- the hepatocytes from individual donors are thawed in a 37° C. water bath only until the ice crystal just disappears (with the thawed solution at approximately 4° C.
- the thawed hepatocytes are maintained in an ice-bath set at approximately 4° C.
- the hepatocytes from multiple donors are placed together (pooled) into a container in the ice bath.
- the hepatocyte suspension containing cells from multiple donors is distributed into multiple cryogenic vials for cryopreservation.
- the “pooled” cryopreserved hepatocytes are stored in a liquid nitrogen freezer or a freezer maintained at approximately ⁇ 150° C.
- the cryopreserved “pooled” hepatocytes can be thawed and used for experimentation using conventional procedures.
- a method for preparing cryopreserved human hepatocytes consisting of hepatocytes from multiple individuals without centrifugation includes cryopreserving hepatocytes from livers of multiple individuals in a hepatocyte suspension in separate vessels for each of the multiple individuals; thawing the vessels of the hepatocytes from multiple individuals in a 37° C. water bath until the hepatocyte suspension reaches a temperature of approximately 4° C.
- the hepatocyte suspension may include a cryoprotectant such as, for example, Dulbecco's Modified Eagle Medium: Nutrient Mixture F-12 (DMEM/F12) medium supplemented with 10% fetal calf serum and 10% dimethyl sulfoxide (DMSO).
- DMEM/F12 Nutrient Mixture F-12
- DMSO dimethyl sulfoxide
- the isolated hepatocytes may be from livers of multiple individuals.
- the cryopreservation of the hepatocytes may include reducing the temperature to about ⁇ 70° C. at a rate of about ⁇ 1° C./min.
- the cryopreserved pooled hepatocytes may be stored in a cryogenic storage system at, for example, a temperature of about ⁇ 150° C. or cooler.
- the cryopreserved pooled hepatocytes are thawed at a later time for experimentation.
- FIG. 1 is a schematic of a novel procedure of thawing and pooling of cryopreserved hepatocytes from individual donors and distribution of the pooled hepatocytes for cryopreservation.
- the inventor has developed an improved method for the preparation of cryopreserved human hepatocytes pooled from multiple donors.
- the method involves the isolation and cryopreservation of hepatocytes from multiple individuals.
- the isolated and cryopreserved hepatocytes are stored in a cryopreservation bank.
- the hepatocytes are thawed, pooled, and re-cryopreserved using the improved method.
- Elements of the improved method are to thaw the hepatocytes quickly at 37° C. to minimize ice crystal formation and the accompanied cellular damage, maintenance of the thawed hepatocytes at approximately 4° C., pooling of the hepatocytes from individual donors at approximately 4° C., distribution of the pooled hepatocytes into multiple containers (“cryovials”) for cryopreservation, and cryopreservation.
- This novel method eliminates the multiple, laborious, and damaging steps of diluting the cryopreservant, centrifugation through an isotonic density gradient to enrich for viable cells, resuspension of the cell pellet in cryopreservant, pooling of the hepatocytes from multiple donors, distribution of the pooled hepatocytes into cryovials, and recryopreservation.
- liver cells are the cells where drug metabolism occurs. Therefore, human hepatocytes in a culture represent a physiologically relevant model for the evaluation of drug metabolism and drug toxicity. To obtain the hepatocytes, the cells are isolated from liver tissue and then preserved using cryopreservation.
- One of the other aspects of the invention is the collection of hepatocytes from various individuals. These hepatocytes are obtained from the liver tissues that have been procured for liver transplantation but not used due to the lack of appropriate recipients. In the United States, several organizations, e.g, International Institute For The Advancement of Medicine (IIAM) and National Development Research Institute (NDRI) specialize in the distribution of human livers to research laboratories.
- IIAM International Institute For The Advancement of Medicine
- NDRI National Development Research Institute
- the hepatocytes are stored in a cryopreservation bank and the cryopreserved cells later can be thawed for experimentation. It is known that there are substantial individual differences in hepatocyte properties, especially in drug metabolizing capacity. To allow the generation of results to represent the “normalized” human population, a mixture of hepatocytes (pooled hepatocytes) from multiple individuals are used.
- the conventional procedure includes thawing hepatocytes that were previously cryopreserved from individual donors, dilution to minimize cryopreservant toxicity, centrifugation to collect the hepatocytes, density gradient separation of viable and non-viable cells/cell debris, suspension of the purified cells in cryopreservant, distribution in cryovials, and recryopreservation. These steps are time-consuming and labor-intensive due to the various dilution and centrifugation steps.
- a novel method is invented here for the preparation of cryopreserved pooled human hepatocytes.
- the individually cryopreserved human hepatocytes are thawed, pooled, distributed in cryovials, and recryopreserved.
- the multiple centrifugation steps, the density gradient, and the use of new cryopreservant are eliminated.
- Vials of cryopreserved human hepatocytes from multiple individual patients were thawed by immersion in water in a waterbath maintained at 37° C. As soon as the ice crystals disappear, the vials are placed in an ice-bath maintained at 4° C.
- the hepatocytes are recombined (pooled) by removal from the vials into a glass beaker in an ice-bath maintained at 4° C.
- the pooled hepatocytes are redistributed using a pipette into multiple vials for a second cryopreservation. No centrifugation or cell purification is performed.
- the vials of pooled hepatocytes are cryopreserved in a programmable freezer at a constant rate of freezing, particularly about ⁇ 1° C./minute until a suitable low temperature, particularly about ⁇ 70° C. or lower, is reached.
- the cryopreserved cells are stored at a suitable temperature, particularly about ⁇ 150° C. or lower, using a suitable apparatus, particularly a liquid nitrogen cryogenic storage system.
- each vial of hepatocytes is removed from liquid nitrogen cryogenic storage, thawed in a 37° C. water bath, and centrifuge at 100 ⁇ g for 10 minutes in 50 mL of Cryopreserved Hepatocytes Recovery Medium (CHRM; APSciences Inc., Columbia, Md.). The resulting pellet can be resuspended and used for experimentation.
- CHRM Cryopreserved Hepatocytes Recovery Medium
- Human hepatocytes isolated and cryopreserved from eight individuals were thawed in a waterbath till the ice crystals disappeared and immediately placed in an ice bath maintained at approximately 4° C.
- the thawed hepatocytes were pooled, distributed into new cryovials and cryopreserved a second time using a control rate freezer programmed at approximately ⁇ 1 degree per minute until ⁇ 90° C.
- the pooled hepatocytes were stored in liquid nitrogen for 7 days.
- the cryopreserved pooled hepatocytes were thawed in a 37° C.
- cryopreserved human hepatocytes pooled from multiple donors can be prepared using the invention.
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Abstract
A method of thawing cryopreserved human hepatocytes and cryopreserving the hepatocytes a second time without losing viability is described. It allows the preparation of cryopreserved human hepatocytes pooled from multiple donors by thawing the hepatocytes from the individual donors, combining the cells to form pooled hepatocytes, and recryopreserving the pooled hepatocytes. The method involves the thawing of the hepatocytes from the individual donors, maintaining the thawed hepatocytes at a low temperature that is above freezing temperature, and refreezing the thawed cells without further manipulation. The method allows the cryopreserving the human hepatocytes a second time after thawing, with viability similar to that after one single cryopreservation. This high efficiency method can be used for the preparation of highly viable pooled human hepatocytes for experimentation to minimize individual variations.
Description
- This utility patent application filed under 35 USC §111 is a continuation of U.S. utility patent application Ser. No. 14/022,722 filed on Sep. 10, 2013, which claims priority to U.S. provisional patent application 61/702,335 filed on Sep. 18, 2012, and which is incorporated by reference herein.
- The field of the invention generally relates to novel methods for the preparation of cryopreserved hepatocytes, in particular, isolated liver parenchymal cells (hepatocytes).
- The parenchymal cells of the liver, generally called hepatocytes, are the major cell types responsible for drug metabolism and are the cells damaged by hepatotoxicants. These cells therefore represent a desirable experimental system for the evaluation of drug metabolism and hepatotoxicity. There are numerous scientific publications on such application of hepatocytes in drug development.
- A major problem with drug development is that a large number of drug candidates would fail in the clinic due to nonefficacy or adverse effects, even though drug candidates chosen for clinical trials are selected after extensive research in preclinical studies using laboratory animals and are found to have acceptable efficacy and safety. One of the major reasons is species differences, namely, that human drug effects may not always be the same as that found in laboratory animals.
- One of the major species differences is drug metabolism. It is now known that human and nonhuman animals differ in multiple drug metabolizing enzyme pathways, with the most important being differences in P450 monooxygenases. The differences in enzyme pathways cause differences in metabolic fate of a xenobiotic. A drug can be toxic to humans and not to laboratory animals if the toxicity is caused by metabolites that are formed only in humans. Conversely, a drug can be toxic to animals but not in humans if the toxic metabolites are animal specific and are not formed in human.
- Hepatocytes isolated from laboratory animals and human therefore represent important experiment systems for the evaluation of possible species differences in drug metabolism and toxicity. The use of hepatocytes is further made practical by successes in cryopreservation. Cryopreserved hepatocytes allow scientists to perform studies with hepatocytes simply by thawing and using the cells, avoiding the time-consuming isolation procedures. Cryopreserved hepatocytes, both from animals and humans, are now available commercially for use in research.
- Individual differences between humans in drug metabolism are an established phenomenon. The differences can be caused by genetic and environmental factors. Hepatocytes from one individual can be substantially different from another individual. To aid “normalization” of the individual differences, human-based drug metabolism systems often involve materials combined from different individuals. For instance, one of the major experiment systems for the evaluation of drug metabolism, human liver microsomes, are often prepared from multiple human livers. This approach has been recently extended to human hepatocytes.
- A typical procedure to thaw, pool, and re-freeze hepatocytes requires dilution of the cryopreservation medium followed by centrifugation through a high density medium to enrich for viable cells before the second freezing. These can be a laborious procedure.
- A method for the preparation of cryopreserved hepatocytes pooled from previously cryopreserved cells is described. In part, the novelty of the method is the thawing, pooling and re-cryopreservation of the hepatocytes without the conventional procedures of firstly dilution of the cryopreserving medium and enrichment of viable cells by iso-density centrifugation.
- In one general aspect, the method involves cryopreserving human hepatocytes from livers of multiple individuals in hepatocyte suspension media in separate vessels for each of the multiple individuals, thawing the vessels of the hepatocytes from multiple individuals in a bath, pooling the thawed hepatocytes from the separate vessels of the multiple individuals in a container, distributing the pooled hepatocytes into multiple vessels, and cryopreserving the multiple vessels of pooled hepatocytes.
- In one of the embodiments, previously cryopreserved hepatocytes isolated from individual donors are stored in liquid nitrogen or a freezer maintained at approximately −150 degrees Celsius (° C.). To prepare cryopreserved hepatocytes pooled from multiple donors, the hepatocytes from individual donors are thawed in a 37° C. water bath only until the ice crystal just disappears (with the thawed solution at approximately 4° C. The thawed hepatocytes are maintained in an ice-bath set at approximately 4° C. The hepatocytes from multiple donors are placed together (pooled) into a container in the ice bath. After hepatocytes from all donors are added to the pool, the hepatocyte suspension containing cells from multiple donors is distributed into multiple cryogenic vials for cryopreservation. The “pooled” cryopreserved hepatocytes are stored in a liquid nitrogen freezer or a freezer maintained at approximately −150° C. The cryopreserved “pooled” hepatocytes can be thawed and used for experimentation using conventional procedures.
- In another general aspect, a method for preparing cryopreserved human hepatocytes consisting of hepatocytes from multiple individuals without centrifugation includes cryopreserving hepatocytes from livers of multiple individuals in a hepatocyte suspension in separate vessels for each of the multiple individuals; thawing the vessels of the hepatocytes from multiple individuals in a 37° C. water bath until the hepatocyte suspension reaches a temperature of approximately 4° C. only until ice crystals in the hepatocyte suspension just disappear; pooling vessels of the hepatocytes from multiple individuals in a container with the temperature of the hepatocyte suspension maintained at a temperature of approximately 4° C.; distributing the pooled hepatocytes into multiple vessels; and cryopreserving the multiple vessels of pooled hepatocytes without diluting or changing the hepatocyte suspension.
- Embodiments may include one or more of the following features. For example, the hepatocyte suspension may include a cryoprotectant such as, for example, Dulbecco's Modified Eagle Medium: Nutrient Mixture F-12 (DMEM/F12) medium supplemented with 10% fetal calf serum and 10% dimethyl sulfoxide (DMSO). The isolated hepatocytes may be from livers of multiple individuals.
- The cryopreservation of the hepatocytes may include reducing the temperature to about −70° C. at a rate of about −1° C./min. The cryopreserved pooled hepatocytes may be stored in a cryogenic storage system at, for example, a temperature of about −150° C. or cooler. The cryopreserved pooled hepatocytes are thawed at a later time for experimentation.
-
FIG. 1 is a schematic of a novel procedure of thawing and pooling of cryopreserved hepatocytes from individual donors and distribution of the pooled hepatocytes for cryopreservation. - The inventor has developed an improved method for the preparation of cryopreserved human hepatocytes pooled from multiple donors. The method involves the isolation and cryopreservation of hepatocytes from multiple individuals. The isolated and cryopreserved hepatocytes are stored in a cryopreservation bank. Upon the collection of hepatocytes from multiple individuals, the hepatocytes are thawed, pooled, and re-cryopreserved using the improved method.
- Elements of the improved method are to thaw the hepatocytes quickly at 37° C. to minimize ice crystal formation and the accompanied cellular damage, maintenance of the thawed hepatocytes at approximately 4° C., pooling of the hepatocytes from individual donors at approximately 4° C., distribution of the pooled hepatocytes into multiple containers (“cryovials”) for cryopreservation, and cryopreservation. This novel method eliminates the multiple, laborious, and damaging steps of diluting the cryopreservant, centrifugation through an isotonic density gradient to enrich for viable cells, resuspension of the cell pellet in cryopreservant, pooling of the hepatocytes from multiple donors, distribution of the pooled hepatocytes into cryovials, and recryopreservation.
- As in humans in vivo, the liver cells (hepatocytes) are the cells where drug metabolism occurs. Therefore, human hepatocytes in a culture represent a physiologically relevant model for the evaluation of drug metabolism and drug toxicity. To obtain the hepatocytes, the cells are isolated from liver tissue and then preserved using cryopreservation.
- One of the other aspects of the invention is the collection of hepatocytes from various individuals. These hepatocytes are obtained from the liver tissues that have been procured for liver transplantation but not used due to the lack of appropriate recipients. In the United States, several organizations, e.g, International Institute For The Advancement of Medicine (IIAM) and National Development Research Institute (NDRI) specialize in the distribution of human livers to research laboratories.
- The hepatocytes are stored in a cryopreservation bank and the cryopreserved cells later can be thawed for experimentation. It is known that there are substantial individual differences in hepatocyte properties, especially in drug metabolizing capacity. To allow the generation of results to represent the “normalized” human population, a mixture of hepatocytes (pooled hepatocytes) from multiple individuals are used. The conventional procedure includes thawing hepatocytes that were previously cryopreserved from individual donors, dilution to minimize cryopreservant toxicity, centrifugation to collect the hepatocytes, density gradient separation of viable and non-viable cells/cell debris, suspension of the purified cells in cryopreservant, distribution in cryovials, and recryopreservation. These steps are time-consuming and labor-intensive due to the various dilution and centrifugation steps.
- A novel method is invented here for the preparation of cryopreserved pooled human hepatocytes. With this novel method, the individually cryopreserved human hepatocytes are thawed, pooled, distributed in cryovials, and recryopreserved. The multiple centrifugation steps, the density gradient, and the use of new cryopreservant are eliminated.
- Procedures for the preparation of pooled cryopreserved human hepatocytes from multiple individuals are shown in
FIG. 1 and set forth in the following operations: - 1. Vials of cryopreserved human hepatocytes from multiple individual patients were thawed by immersion in water in a waterbath maintained at 37° C. As soon as the ice crystals disappear, the vials are placed in an ice-bath maintained at 4° C.
- 2. The hepatocytes are recombined (pooled) by removal from the vials into a glass beaker in an ice-bath maintained at 4° C.
- 3. The pooled hepatocytes are redistributed using a pipette into multiple vials for a second cryopreservation. No centrifugation or cell purification is performed.
- 4. The vials of pooled hepatocytes are cryopreserved in a programmable freezer at a constant rate of freezing, particularly about −1° C./minute until a suitable low temperature, particularly about −70° C. or lower, is reached. The cryopreserved cells are stored at a suitable temperature, particularly about −150° C. or lower, using a suitable apparatus, particularly a liquid nitrogen cryogenic storage system.
- For experimentation with the cryopreserved pooled hepatocytes, each vial of hepatocytes is removed from liquid nitrogen cryogenic storage, thawed in a 37° C. water bath, and centrifuge at 100×g for 10 minutes in 50 mL of Cryopreserved Hepatocytes Recovery Medium (CHRM; APSciences Inc., Columbia, Md.). The resulting pellet can be resuspended and used for experimentation.
- 1. Human hepatocytes isolated and cryopreserved from six individuals were thawed in a waterbath till the ice crystals disappeared and immediately placed in an ice bath maintained at approximately 4° C. The thawed hepatocytes were cryopreserved a second time using a control rate freezer programmed at approximately −1 degree per minute until −90° C. The hepatocytes were stored in liquid nitrogen for 7 days. The hepatocytes from the initial cryopreservation and the second cryopreservation were thawed in a 37° C. waterbath, recovered by centrifugation through Cryopreserved Hepatocytes Recovery Medium (APSciences Inc.), resuspended in culture medium, and viability determined by trypan blue exclusion. The following results were observed:
-
Viability Viability Hepatocytes (1st cryopreservation) (2nd cryopreservation) Donor 192% 88 % Donor 2 94% 95 % Donor 3 86% 86 % Donor 4 76% 77% Donor 5 96% 94% Donor 6 88% 76% - The results showed that the novel method allows human hepatocytes to be recovered from cryopreservation, followed by a second cryopreservation, without apparent loss of—viability. This success suggest that hepatocytes from multiple individuals can be thawed, pooled and re-cryopreserved.
- 2. Human hepatocytes isolated and cryopreserved from eight individuals were thawed in a waterbath till the ice crystals disappeared and immediately placed in an ice bath maintained at approximately 4° C. The thawed hepatocytes were pooled, distributed into new cryovials and cryopreserved a second time using a control rate freezer programmed at approximately −1 degree per minute until −90° C. The pooled hepatocytes were stored in liquid nitrogen for 7 days. The cryopreserved pooled hepatocytes were thawed in a 37° C. waterbath, recovered by centrifugation through Cryopreserved Hepatocytes Recovery Medium (APSciences Inc.), resuspended in culture medium, and viability determined by trypan blue exclusion. The viability was determined to be 91%. The results therefore suggest that cryopreserved human hepatocytes pooled from multiple donors can be prepared using the invention.
Claims (14)
1. A method for preparing cryopreserved human hepatocytes pooled from multiple individuals without centrifugation and without diluting or changing the hepatocyte suspension, the method comprising:
thawing separate vessels of hepatocytes from multiple individuals in a bath;
pooling the thawed hepatocytes from the separate vessels of the multiple individuals in a container;
distributing the pooled hepatocytes into multiple vessels; and
cryopreserving the multiple vessels of pooled hepatocytes.
2. The method of claim 1 , wherein thawing the vessels of the hepatocytes from multiple individuals includes thawing the vessels of the hepatocytes from multiple individuals in a 37° C. water bath.
3. The method of claim 1 , wherein thawing the vessels of the hepatocytes from multiple individuals in a bath includes thawing until the hepatocyte suspension media reaches a temperature of approximately 4° C.
4. The method of claim 1 , wherein the hepatocyte suspension media comprises a cryoprotectant.
5. The method of claim 4 , wherein the cryoprotectant comprises Dulbecco's Modified Eagle Medium: Nutrient Mixture F-12 (DMEM/F12) medium supplemented with 10% fetal calf serum and 10% dimethyl sulfoxide (DMSO).
6. The method of claim 1 , wherein cryopreserving the hepatocytes comprises cryopreserving the hepatocytes to a temperature of about −70° C. at a rate of about −1° C./min.
7. The method of claim 1 , further comprising storing the cryopreserved pooled hepatocytes in a cryogenic storage system.
8. The method of claim 7 , wherein storing the hepatocytes comprises storing at a temperature of about −150° C. or cooler.
9. The method of claim 1 , further comprising isolating the hepatocytes from livers of multiple individuals.
10. The method of claim 1 , further comprising thawing of the cryopreserved pooled hepatocytes for experimentation.
11. The method of claim 1 , wherein thawing the vessels of the hepatocytes includes thawing the vessels of the hepatocytes until the hepatocyte suspension media reaches a temperature of approximately 4° C.
12. The method of claim 1 , wherein thawing the vessels of the hepatocytes includes thawing the vessels of the hepatocytes until ice crystals in the hepatocyte suspension just disappear.
13. The method of claim 1 , wherein pooling the thawed hepatocytes includes pooling the thawed hepatocytes while maintaining the temperature of the hepatocyte suspension media at approximately 4° C.
14. The method of claim 1 , further comprising:
cryopreserving human hepatocytes from livers of multiple individuals in hepatocyte suspension media in separate vessels for each of the multiple individuals.
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US10159244B2 (en) | 2015-02-27 | 2018-12-25 | Lonza Walkersville, Inc. | Method for pooling hepatocytes |
CN108699514B (en) * | 2016-02-26 | 2023-07-07 | 隆萨沃克斯维尔股份有限公司 | Method for pooling hepatocytes |
GB201716729D0 (en) * | 2017-10-12 | 2017-11-29 | Asymptote Ltd | Cryopreservation method and apparatus |
WO2024026313A1 (en) | 2022-07-25 | 2024-02-01 | The Regents Of The University Of California | Methods of producing and using avian embryonic stem cells and avian telencephalic organoids |
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US7604929B2 (en) * | 2005-04-21 | 2009-10-20 | In Vitro Technologies, Inc. | Cellular compositions and methods for their preparation |
US20110105359A1 (en) * | 2009-10-30 | 2011-05-05 | Xenotech, Llc | Cryopreservation of cells and subcellular fractions |
US20110117541A1 (en) * | 2007-01-29 | 2011-05-19 | Li Albert P | Method for Screening of Agents for the Prevention of Hepatitis C Virus Infection with Cell Culture Tool |
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US5795711A (en) * | 1996-04-04 | 1998-08-18 | Circe Biomedical, Inc. | Cryopreserved hepatocytes and high viability and metabolic activity |
US5895745A (en) * | 1996-09-25 | 1999-04-20 | W.R. Grace & Co.-Conn. | Method of thawing cryopreserved cells |
DE102005057106A1 (en) * | 2005-11-25 | 2007-06-06 | Cytonet Gmbh & Co. Kg | Cryopreservation of hepatocytes |
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- 2013-09-17 WO PCT/IB2013/058619 patent/WO2014045202A2/en active Application Filing
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US7604929B2 (en) * | 2005-04-21 | 2009-10-20 | In Vitro Technologies, Inc. | Cellular compositions and methods for their preparation |
US20110117541A1 (en) * | 2007-01-29 | 2011-05-19 | Li Albert P | Method for Screening of Agents for the Prevention of Hepatitis C Virus Infection with Cell Culture Tool |
US20110105359A1 (en) * | 2009-10-30 | 2011-05-05 | Xenotech, Llc | Cryopreservation of cells and subcellular fractions |
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US20150072423A1 (en) | 2015-03-12 |
EP2928294A4 (en) | 2016-02-17 |
CN104797134A (en) | 2015-07-22 |
CN104797134B (en) | 2017-06-13 |
EP2928294A2 (en) | 2015-10-14 |
WO2014045202A3 (en) | 2014-05-15 |
WO2014045202A2 (en) | 2014-03-27 |
US9078430B2 (en) | 2015-07-14 |
EP2928294B1 (en) | 2019-06-05 |
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