WO1999005301A1 - Procede de transfert de genes a l'aide d'un milieu exempt de serum - Google Patents
Procede de transfert de genes a l'aide d'un milieu exempt de serum Download PDFInfo
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- WO1999005301A1 WO1999005301A1 PCT/JP1998/003173 JP9803173W WO9905301A1 WO 1999005301 A1 WO1999005301 A1 WO 1999005301A1 JP 9803173 W JP9803173 W JP 9803173W WO 9905301 A1 WO9905301 A1 WO 9905301A1
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- retrovirus
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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
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
- C12N15/86—Viral vectors
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- 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
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
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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
- C12N2740/00—Reverse transcribing RNA viruses
- C12N2740/00011—Details
- C12N2740/10011—Retroviridae
- C12N2740/13011—Gammaretrovirus, e.g. murine leukeamia virus
- C12N2740/13041—Use of virus, viral particle or viral elements as a vector
- C12N2740/13043—Use of virus, viral particle or viral elements as a vector viral genome or elements thereof as genetic vector
Definitions
- the present invention relates to a method for gene transfer using a serum-free medium, and more specifically, to improve the efficiency of gene transfer to target cells in the fields of medicine, cell engineering, genetic engineering, developmental engineering, etc.
- the present invention relates to a method for enabling efficient operations and a series of related technologies.
- a retrovirus vector is a preferable means of gene transfer, particularly for gene therapy where long-term gene expression is desired, since it efficiently introduces the foreign gene of interest into cells and stably integrates it into its chromosomal DNA.
- the vector is variously modified so as not to adversely affect the transfected organism.
- the vector itself used for gene transfer replicates in cells
- the replication function in the vector has been deleted so as not to repeat unrestricted infection (gene transfer). Since these vectors (replication-defective retrovirus vectors) cannot replicate themselves, generally a retrovirus producing cells (packaging cells) is used to prepare a retrovirus in which the vector is wrapped in virus particles. I do.
- bone marrow cells are good target cells for somatic cell gene therapy because they can be handled in vitro and contain hematopoietic stem cells having self-renewal ability.
- Umbilical cord blood has also been proven to contain numerous primitive progenitor cells, including hematopoietic stem cells.
- hematopoietic stem cells are one of the most difficult cells for efficient gene transfer.
- the most efficient gene transfer protocol for hematopoietic stem cells in mice and other animals has been to co-culture hematopoietic stem cells with retinal virus-producing cells. Therefore, clinical gene therapy in humans requires gene transfer in a cell-free system with low risk of contamination with retrovirus-producing cells.
- fibronectin and its fragments which are components of extracellular matrix, alone improve the efficiency of gene transfer into cells by Letoorchial virus [Journal of Clinical Infinity]. Bestigation (J. Clin. Invest., Vol.93, Vol.145-1-14 57 pages (1994), Blood, Vol. 88, 855-862 pages (1996)].
- fibronectin fragments produced by genetic engineering have similar properties, and it has been shown that foreign genes can be efficiently introduced into hematopoietic stem cells using this property (see, WO95Z26202000).
- WO 97/183310 discloses that a functional substance other than fibronectin such as fibroblast growth factor ⁇ collagen improves gene transfer efficiency, and a function having a retrovirus binding activity. It has been shown that a similar improvement in gene transfer efficiency occurs when a mixture of a functional substance and another functional substance having the target cell binding activity is used.
- retrovirus infection that is, gene transfer occurs by culturing target cells in a medium containing the retrovirus.
- the medium used for this step is animal serum, often containing fetal calf serum (FCS).
- FCS fetal calf serum
- Serum contains components that can serve as a nutrient source for cells and various growth factors, and is said to be highly effective in maintaining cells in vitro.
- Serum is derived from animals, and the components contained therein and their contents are considered to fluctuate depending on the health condition of the animal from which the serum was collected. Therefore, culturing cells and / or using different lots of serum Reproducible results are not always obtained when gene transfer is performed.
- serum derived from a heterologous organism other than human contains a substance having an antigenic property against human, and when cells maintained in the presence of such serum are transplanted into human. Requires an appropriate washing operation to reduce the content of the antigenic substance.
- serum must be strictly quality controlled so that it does not contain viruses, mycoplasmas, etc.
- the present inventors have assiduously studied that, when a serum-free medium is used, the gene transfer efficiency is improved as compared with a conventional serum-containing medium, and especially in a medium to which low-density lipoprotein is added. The inventors have found that high gene transfer efficiency can be obtained, and have completed the present invention.
- the first invention of the present invention is to improve the efficiency of retroviral gene transfer of a target cell by co-locating the retrovirus and the target cell in a method for introducing a gene into a target cell by the retrovirus. And infecting target cells with a retrovirus in a serum-free culture medium in the presence of an effective amount of a functional substance.
- the functional substance used in the present invention is not particularly limited.
- a substance having a retrovirus binding site and a target cell binding site in the same molecule, or a molecule having a reto-oral virus binding site and a target cell binding site Mixtures with other molecules having the following can be used.
- the functional substance having a retrovirus binding site include functional substances such as fibronectin, fibroblast growth factor, collagen, and polylysine, or the same.
- a substance having a retrovirus binding activity such as a heparin-binding substance other than those described above, can be used.
- a substance having a ligand that binds to a target cell can be used as the functional substance having a target cell binding site.
- the functional substance suitable for the present invention includes, for example, a retrovirus binding site such as a heparin-binding site and a cell binding site such as a binding region to VLA-5 and / or VLA-4.
- the polypeptide whose amino acid sequence is shown in SEQ ID NO: 1 (CH-296) is a fibronectin fragment having a heparin-II binding region and a binding region to VLA-5 and VLA-4. It is.
- the culture medium used in the method of the present invention is not particularly limited as long as it does not contain serum, and a medium prepared by mixing components other than serum necessary for maintaining and growing cells is used.
- a commercially available serum-free medium may be used.
- These media may contain appropriate proteins and cytokines.
- a medium containing low-density lipoprotein (LDL) is suitable for the present invention.
- a second invention of the present invention relates to a cell into which a gene has been introduced, wherein the gene has been introduced by the method of the first invention.
- the cell into which the gene is to be introduced is not particularly limited, and gene transfer can be performed using various available cells as targets.
- a third invention of the present invention relates to a method for transferring a gene-introduced cell to a vertebrate, characterized by transplanting the gene-introduced cell of the second invention into a vertebrate.
- the fourth invention of the present invention relates to a culture medium used for gene transfer. And contains an effective amount of a functional substance that does not contain serum and that can improve the retroviral gene transfer efficiency of the target cells by co-locating the retrovirus and the target cells. I do.
- a polypeptide having the amino acid sequence shown in SEQ ID NO: 1 in the sequence listing can be used.
- the medium of the fourth invention is not particularly limited as long as it does not contain serum.
- a commercially available cell culture medium containing no serum particularly preferably a medium to which low-density lipoprotein is added is used. be able to.
- the medium may contain a suitable cytokine, if necessary.
- a recombinant retrovirus vector is usually used, and a replication-defective recombinant retrovirus vector is particularly preferable.
- the vector is replication-deficient so that it cannot replicate in infected cells and is non-pathogenic.
- the retrovirus in which these vectors are packaged can invade vertebrate cells, especially host cells such as mammalian cells, and stably integrate the foreign gene inserted into the vector into its chromosomal DNA. .
- a foreign gene to be introduced into a cell is used by inserting it into a retrovirus vector under the control of an appropriate promoter--for example, the promoter of the LTR present in the retrovirus vector or a foreign promoter.
- an appropriate promoter for example, the promoter of the LTR present in the retrovirus vector or a foreign promoter.
- other regulatory elements cooperating with the promoter and transcription start site such as an enhancer sequence, may be present in the vector to effect transcription of the foreign gene.
- the introduced gene can contain a terminator sequence downstream thereof.
- the foreign gene to be introduced may be natural or artificially created, or a DNA molecule of different origin linked by ligation or other means known in the art. It may be.
- any gene desired to be introduced into cells can be selected.
- foreign genes include enzymes and proteins associated with the disease to be treated, antisense nucleic acids or ribozymes or false primers (see, for example, WO 90/13641), intracellular antibodies (for example, WO94Z0261). No. 0), and those encoding growth factors and the like can be used.
- the retroviral vector used in the present invention may have an appropriate marker gene that enables selection of cells into which the gene has been introduced.
- the marker gene for example, a drug resistance gene that confers resistance to an antibiotic on a cell, or a reporter gene that can identify a cell into which a gene has been introduced by detecting enzyme activity can be used.
- Vectors that can be used include, for example, known MFG vectors (ATCC),
- these vectors are known packaging cell lines, for example, the known PG13 (AT CC CRL-10686), PG13 / LNc8 (AT CC CRL-1 0685), PA31 (AT CC CRL—9078) and the cell lines described in US Pat. No. 5,278,056, GP + E—86 (AT CCCRL 9642), GP + en V Am—12 (AT CC CRL 9641), Proceedings The National Academy of Sciences 'Op Science' 'Ob' The USA (Proc. Natl. Acad. Sci. USA), Vol. 85, pp. 6460-664 (1988).
- the vector can be prepared as a packaged virus particle by using a cell line such as Psi-Crip.
- a serum-free medium is used as a medium.
- serum-free medium refers to a medium for culturing animal cells that does not contain serum derived from animals including humans and is composed of substances whose chemical components are clearly defined.
- a serum-containing medium to which a purified and identified substance that is a component of serum is added is included in the serum-free medium.
- the basic components of such a medium include energy sources such as amino acids, sugars, and organic acids, vitamins, buffer components for adjusting pH, and inorganic salts. It may also contain a pH indicator such as phenol red.
- Such basic media include known media such as Dulbecco's modified Eagle's medium (DMEM), Iscove's modified Dulbecco's medium
- IMDM IMDM
- Gibco BRL Gibco BRL
- cytokines can be added and used for the purpose of promoting or suppressing the growth and differentiation of target cells.
- cytokines include interleukins (IL-13, IL-16, etc.), colony stimulating factors (G-CSF, GM-CSF, etc.), stem cell factor (SCF), erythropoietin and various cells.
- growth factors There are growth factors, and many of them are commercially available from humans.
- LDL Low Density Lipoprotein
- Low-density lipoprotein is commercially available from human and can be obtained, for example, from Sigma.
- high gene transfer efficiency can be obtained.
- gene transfer can be performed with even higher efficiency.
- the present invention is characterized in that retroviruses and target cells can be co-located to improve retrovirus gene transfer efficiency of target cells, and that retroviruses are transmitted to target cells in the presence of a functional substance. I do.
- Genetic transfected cells can be obtained with high efficiency by allowing effective amounts of these functional substances to coexist when infecting cells with the letto-oral virus.
- these functional substances include WO95Z26200 Functional materials described in Japanese Patent Application Laid-Open Publication No. Hei.
- an effective amount is an amount effective to cause transformation of a target cell by the introduction of the gene into the target cell by the Letoorchial virus, and is more appropriate depending on the functional substance used and the type of the target cell. Choose the amount. This amount can be determined, for example, by measuring the gene transfer efficiency by the method described herein.
- the gene transfer efficiency means the transformation efficiency.
- the functional substance having a retrovirus binding site used in the present invention is not particularly limited, and examples thereof include a heparin-1 II binding region of fibronectin, fibroblast growth factor, collagen, polylysine, However, substances functionally equivalent to these functional substances, for example, a functional substance having a heparin binding site can also be used. Further, a mixture of the functional substance, a polypeptide containing the functional substance, a polymer of the functional substance, a derivative of the functional substance, and the like can be used.
- the functional substance having a target cell binding site used in the present invention is not particularly limited, but is a substance having a ligand that binds to a target cell.
- the ligand include cell-adhesive proteins, hormones, and cytochromes. Examples include tocaine, antibodies to cell surface antigens, polysaccharides and glycoproteins, sugar chains in glycolipids, and metabolites of target cells.
- a polypeptide containing the functional substance, a polymer of the functional substance, a derivative of the functional substance, a functional equivalent of the functional substance, and the like can also be used.
- the functional substances as described above can be obtained from naturally occurring substances, and can be artificially produced (for example, produced by genetic recombination technology or chemical synthesis technology). It can also be made by a combination of and an artificially made substance.
- W0 9 7 Z 1 8 3 As described in Japanese Patent Publication No. 18, when performing gene transfer using these functional substances, a functional substance having a retrovirus binding site and another functional substance having a target cell binding site are used. They can be used as a mixture, or can be used by selecting or preparing a functional substance having a reticulovirus binding site and a target cell binding site on the same molecule.
- fibronectin, a fragment thereof, or a mixture thereof can be used, and these functional substances are of natural origin or produced by chemical synthesis.
- Journal of Biochemistry (J. Biol. Chem.) Vol. 256, No. 7277 (1981), Journal of Cell Biology (J. Cell) Biol.), Vol. 102, p. 449 (1986), Journal of Cell Biology, vol. 105, p. 489 (1989) It can be produced in substantially pure form from naturally occurring materials.
- fibronectin or fibronectin fragment as described herein means that they are substantially free of other proteins that are naturally present with fibronectin.
- fibronectin fragments that can be used herein, or useful information regarding the production of such fragments, can be found in Journal of Biochemistry (J. Biochem.), Vol. 110, Vol. Pp. 291 (1991) (this is further reported on the above recombinant fragment); EMBO J., Vol. 4, pp. 1755-1759 (1) 985) (which reports the structure of the human fibronectin gene); and Biochemistry, Vol. 25, pp. 4936-494 (1 986) Tove mouth (Reporting on the heparin-II binding region of Nectin).
- the fibronectin or fibronectin fragment described herein can also be produced from a genetically modified product, for example, as generally described in US Pat. No. 5,198,423.
- a fibronectin fragment containing the heparin-1 II region which is a retrovirus binding site, such as CH-296 (the amino acid sequence is shown in SEQ ID NO: 1 in the sequence listing) used in the Examples below, and H-271 , H-296, CH-271, etc., and methods for obtaining them are described in detail in this patent specification.
- fragments that can be routinely derived from these fragments can be prepared by modifying the plasmid retained in Escherichia coli by a known gene recombination technique.
- H-296 represents a polypeptide binding region to VLA-4
- CH-271 represents a peptide binding region to VLA-5
- CH-296 represents a peptide binding region to VLA-5. It has both [Nature Medicine, Nature Medicine, Vol. 2, pp. 876-882 (1996)].
- the gene transfer efficiency in a serum-free medium is improved in the presence of fibronectin and the above-mentioned fibronectin fragment CH-296.
- fibronectin fragment having a cell binding activity with the above-mentioned H-271 which is a fibronectin fragment having a retrovirus binding region.
- H-271 which is a fibronectin fragment having a retrovirus binding region.
- the same gene transfer efficiency can be obtained by mixing and using the fragment C-271.
- Gene-introduced cells can be obtained efficiently by infecting cells with a retrovirus in a serum-free medium in the presence of an effective amount of the above-mentioned fibronectin, fibronectin fragment or a mixture thereof.
- Fibronectin, a fibronectin fragment or a mixture thereof may be used, for example, in a state immobilized on the surface of a culture vessel used for retrovirus infection.
- Retroviral infection can be carried out by conventional methods, for example, by incubation at 37 ° C and 5% carbon dioxide. The time of this condition incubation may be appropriately changed depending on the target cell and the purpose.
- G is the target cell. If the cells are in the early stage, the virus is not infected by the retrovirus, so it is preferable to induce the cell cycle by pre-stimulation, and for this purpose, the target cells are transformed with an appropriate target cell growth factor prior to retrovirus infection. Culture in the presence.
- a target cell growth factor such as interleukin (IL) 16 or stem cell factor is used for pre-stimulation when a gene is introduced into bone marrow cells or hematopoietic stem cells.
- stem cells hematopoietic cells, non-adhesive low-density mononuclear cells, adherent cells, bone marrow cells, hematopoietic stem cells, peripheral blood Stem cells, umbilical cord blood cells, fetus Embryonic hematopoietic stem cells, embryogenic stem cells, embryonic cells, primordial germ cells, oocytes, oocyte cells, ova, spermatocytes, sperm, CD34 + cells, C-1 kit + cells, pluripotent hematopoietic progenitor cells, monopotent hematopoietic progenitor cells, erythroid progenitor cells, lymphocyte mother cells, mature blood cells, lymphocytes, B cells, T cells, fibroblasts, neuroblasts, neurons , Endothelial cells, vascular endothelial cells, hepatocytes, myo
- blood progenitor cells such as hematopoietic stem cells, CD34 + cells, C-kit + cells, and pluripotent hematopoietic progenitor cells are used as target cells.
- hematopoietic stem cells CD34 + cells
- C-kit + cells pluripotent hematopoietic progenitor cells
- fibronectin-fibronectin fragment as a functional substance, in particular, a fibronectin fragment having a binding region to VLA-5 and / or VLA-4 as a cell binding site, Genes can be efficiently transferred into cells expressing VLA-5 and VLA-4, such as hematopoietic stem cells and CD34 + cells.
- cells into which a gene has been introduced by the method of the present invention can be transplanted into a living body, and thereby gene therapy for expressing a foreign gene in a living body can be performed.
- the transfected cells obtained by the method of the present invention do not contain proteins and impurities derived from serum of a heterologous animal, and thus are suitable for transplantation into a living body.
- gene therapy using hematopoietic stem cells as target cells can be performed by the following operation. First, a material containing hematopoietic stem cells, such as bone marrow tissue, peripheral blood, and umbilical cord blood, is collected from a donor. These materials can be used as they are for the gene transfer operation.
- a mononuclear cell fraction containing hematopoietic stem cells is prepared by a method such as density gradient centrifugation, or CD 34 Purify hematopoietic stem cells using cell surface marker molecules such as and / or C-kit.
- the material containing these hematopoietic stem cells is subjected to preliminary stimulation using an appropriate cell growth factor or the like, if necessary, and then the recombinant retroviral vector into which the target gene has been inserted by the method of the present invention. Infect.
- the transfected cells thus obtained can be transplanted into a recipient, for example, by intravenous administration.
- the recipient is preferably Donna itself, but allogeneic transplantation is also possible. For example, when umbilical cord blood is used as a material, allogeneic transplantation is performed.
- Gene therapy that targets hematopoietic stem cells complements genes that are missing or abnormal in a patient.
- gene therapy for ADA deficiency-Gaucher disease is an example.
- a drug resistance gene may be introduced into hematopoietic stem cells in order to alleviate the damage of hematopoietic cells caused by a chemotherapeutic agent used for treating cancer leukemia.
- the gene transfer method of the present invention by using the gene transfer method of the present invention, cells into which a gene has been transferred with high efficiency can be obtained. Since the cells thus obtained do not contain serum derived from a heterologous organism, they can be transplanted into a living body without any special operation. Furthermore, compared to the culture medium used in the conventional method, there is no change in the types and contents of the components in the culture medium, so that gene transfer with high reproducibility can be performed.
- the polypeptide derived from human fibronectin, CH-296 contains a recombinant plasmid pCH102 containing DNA encoding the polypeptide. It was prepared from E. coli, Escheri chia coli HB101 / p CH102 (FERM BP-2800) by the method described in US Pat. No. 5,198,423.
- Phosphate buffered saline was adjusted to 50 ⁇ g / m 1 for fibronectin (Sigma) and 100 ⁇ g / ml for CH-296 described in Example 1. Dissolved in water (PBS, manufactured by Bio-ITSUTA Corporation) It was then filtered through a 0.22 / m filter (Minisart 'filter 0.22 m, Sartorius). 1 2 ⁇ El plates plus 1 m 1 of CH- 296 solution or fibronectin solution per Ueru of (Falcon), and incubated for 2 hours at room temperature, was immobilized.
- the solution used for immobilization was replaced with PBS containing 2 ml of 2% serum albumin (BSA, manufactured by Sigma) at 2 ml / well, incubated for 30 minutes at room temperature, and then diluted to 25 mM.
- the plate was washed twice with Hanks' buffered salt solution (manufactured by Gibco BRL) containing (HEPES, manufactured by Gibco BRL).
- interleukin - 6 IL- 6, Amgen Inc.
- S CF stem cell factor
- the titer of the virus solution thus obtained was reported according to the method described in [Cancer Gene Therapy, Vol. 4, pp. 5-8 (1997)], in accordance with the method of Rat 2 cells (ATCC CRL- 1 764) was measured using a, 1. 7 X 1 0 7 pfu / m 1 in that with RPMI medium containing 10% FCS, also containing 40 ⁇ g / m 1 LD L bIT- 9500 medium was 1.8 ⁇ 10 6 ⁇ ⁇ u / m 1.
- CD34 + cells were obtained from human peripheral blood mobilized by chemotherapy and G-CSF [Human 'Gene' Therapy, Volume 5, 1325-1333 (1994)]. Isolation was performed using a separation method (magnetic 'activited' cell sorting, manufactured by Milteni Biotech). The purity of the obtained CD34 + cells is 95%.
- CD34 + cells were primed prior to retroviral infection. That is, the CD34 + cells prepared in Example 4 were subjected to 10% FCS in the presence of 10 ng / ml IL-3, 10 ng / ml IL-6, and 100 ng / ml SCF. Was incubated for 48 hours in a RPMI medium containing BDL-9500 medium containing 40 g / ml of LDL. 3 ⁇ 10 5 pre-stimulated CD 34+ cells were suspended in the virus solution prepared in Example 3. As the virus solution, a solution prepared in the same medium as that used for the preliminary stimulation of each CD34 + cell was selected and used.
- This cell suspension was immobilized on the wells of unfixed 12-well plates (untreated wells), and on the fibronectin-immobilized wells prepared in Example 2 and CH-296.
- the cells were added to each of the transformed wells, and the cells were cultured at 37 ° C. for 2 hours in the presence of 5% carbon dioxide.
- Polybren (4 gZml, Sigma) was added to the untreated wells and the fibronectin-immobilized wells.
- a new virus solution (containing the above concentrations of IL-3, IL-6, and SCF) was added, and the cells were further cultured at 37 ° C in the presence of 5% carbon dioxide for 22 hours.
- the cells are recovered using a cell dissociation buffer and suspended in 1 ⁇ 1 medium containing 10% ⁇ 03 or in BIT-9500 medium containing 40 ⁇ g / ml of LDL. Cultured for hours.
- CD34 + cells contain 10 ng / ml of IL-3, 10 ng / ml of IL-6 and 100 ng / ml of SCF in the presence of 5% 10%! ⁇ ? ⁇ 11 medium Prestimulation was performed for 24 hours in BIT-9500 medium containing medium or 40 ⁇ g Zm1 LDL.
- Example 5 Each of the 250 transfected cells obtained in Example 5 was placed in a semi-solid medium containing 0.9% methylcellulose, 30% FCS, 1% BSA, 0.1 mM mercaptoethanol, and 2 mM glutamine (Mesocult H 4230, stem cells, Techno mouth ges) was added to each plate containing 0.5 ml
- the culture medium contains 2 units of Zm1 Elis Mouth Poetin (manufactured by Amgen), 10 ng Zm1 GM-CSF (manufactured by Amdin), and 10 ng / m1 G-CSF (manufactured by Amgen). , 10 ⁇ gZml SCF, 10 ng / ml IL-3, and 10 ng / ml IL-6.
- the gene transfer efficiency was determined from the enzymatic activity of one galactosidase expressed from the n1sLacZ gene. After directly staining the above plate cultured for 21 days with X-Ga1 (5-bromo-4,3-chloro-1,3-indolyl-j3-D-galactoside), the number of blue-stained colonies was counted. The ratio to the total number of knees was examined.
- Table 1 shows the percentage of X—Ga1 positive colonies thus obtained.
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98932527A EP0999279A4 (en) | 1997-07-23 | 1998-07-15 | METHOD FOR TRANSFERRING GENES USING A SERUM-FREE MEDIUM |
AU82422/98A AU8242298A (en) | 1997-07-23 | 1998-07-15 | Gene transfer method with the use of serum-free medium |
KR1020007000119A KR100572032B1 (ko) | 1997-07-23 | 1998-07-15 | 무혈청 배지를 사용하는 유전자 도입방법 |
US09/463,296 US6287864B1 (en) | 1997-07-23 | 1998-07-15 | Gene transfer method with the use of serum-free medium |
JP50964599A JP3754090B2 (ja) | 1997-07-23 | 1998-07-15 | 無血清培地を用いた遺伝子導入方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP9/196772 | 1997-07-23 | ||
JP19677297 | 1997-07-23 |
Publications (1)
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WO1999005301A1 true WO1999005301A1 (fr) | 1999-02-04 |
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PCT/JP1998/003173 WO1999005301A1 (fr) | 1997-07-23 | 1998-07-15 | Procede de transfert de genes a l'aide d'un milieu exempt de serum |
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US (1) | US6287864B1 (ja) |
EP (1) | EP0999279A4 (ja) |
JP (1) | JP3754090B2 (ja) |
KR (1) | KR100572032B1 (ja) |
AU (1) | AU8242298A (ja) |
TW (1) | TWI239352B (ja) |
WO (1) | WO1999005301A1 (ja) |
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- 1998-07-15 EP EP98932527A patent/EP0999279A4/en not_active Withdrawn
- 1998-07-15 US US09/463,296 patent/US6287864B1/en not_active Expired - Fee Related
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US8975070B2 (en) | 2002-03-25 | 2015-03-10 | Takara Bio Inc. | Process for producing cytotoxic lymphocyte |
JPWO2005019450A1 (ja) * | 2003-08-22 | 2006-10-19 | タカラバイオ株式会社 | 細胞傷害性リンパ球の製造方法 |
JP4870432B2 (ja) * | 2003-08-22 | 2012-02-08 | タカラバイオ株式会社 | 細胞傷害性リンパ球の製造方法 |
US8927273B2 (en) | 2003-08-22 | 2015-01-06 | Takara Bio Inc. | Process for producing cytotoxic lymphocytes |
US8765469B2 (en) | 2005-08-17 | 2014-07-01 | Takara Bio Inc. | Method of producing lymphocytes |
JP2017506511A (ja) * | 2014-02-14 | 2017-03-09 | ナショナル ユニバーシティー オブ アイルランド, ゴールウェイ | 無血清培地 |
US10472605B2 (en) | 2014-02-14 | 2019-11-12 | National University Of Ireland, Galway | Serum-free medium |
JP2023511024A (ja) * | 2019-12-30 | 2023-03-16 | サン-ゴバン パフォーマンス プラスティックス コーポレイション | 細胞形質導入のための容器及び方法 |
Also Published As
Publication number | Publication date |
---|---|
AU8242298A (en) | 1999-02-16 |
JP3754090B2 (ja) | 2006-03-08 |
US6287864B1 (en) | 2001-09-11 |
TWI239352B (en) | 2005-09-11 |
KR20010021561A (ko) | 2001-03-15 |
KR100572032B1 (ko) | 2006-04-18 |
EP0999279A4 (en) | 2001-04-25 |
EP0999279A1 (en) | 2000-05-10 |
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