| Subculturing |
Volumes used in this protocol are for 75 cm2 flask; proportionally reduce or increase amount of dissociation medium for culture vessels of other sizes.
- Remove and discard culture medium.
- Briefly rinse the cell layer with 1X PBS (Ca+2/Mg+2-free, ATCC SCRR-2201) to remove all traces of serum that contains trypsin inhibitor.
- Add 2.0 to 3.0 mL of 0.25% (w/v) Trypsin / 0.53 mM EDTA solution to flask and observe cells under an inverted microscope until cell layer is dispersed (usually within 5 to 15 minutes).
Note: To avoid clumping do not agitate the cells by hitting or shaking the flask while waiting for the cells to detach. Cells that are difficult to detach may be placed at 33°C to facilitate dispersal.
- Add 6.0 to 8.0 mL of complete growth medium and aspirate cells by gently pipetting.
- Add appropriate aliquots of cell suspension to new culture vessels.
Subcultivation ratio: 1:4 –1:8
- Place culture vessels in incubators at 33°C.
Note: For more information on enzymatic dissociation and subculturing of cell lines consult Chapter 10 in Culture of Animal Cells, a manual of Basic Technique by R. Ian Freshney, 3rd edition, published by Alan R. Liss, N.Y., 1994.
Medium Renewal
Two to three times weekly
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| References |
Moore KA, et al. Hematopoietic activity of a stromal cell transmembrane protein containing epidermal growth factor-like repeat motifs. Proc. Natl. Acad. Sci. USA 94: 4011-4016, 1997. PubMed: 9108096
Miller JS, et al. Single adult human CD34(+)/Lin-/CD38(-) progenitors give rise to natural killer cells, B-lineage cells, dendritic cells, and myeloid cells. Blood 93: 96-106, 1999. PubMed: 9864151
Moore KA, et al. In vitro maintenance of highly purified, transplantable hematopoietic stem cells. Blood 89: 4337-4347, 1997. PubMed: 9192756
Hachney JA, et al. A molecular profile of a hematopoietic stem cell niche. Proc. Natl. Acad. Sci. USA 99: 13061-13066, 2002. PubMed: 12226475
Punzel M, et al. The myeloid-lymphoid initiating cell (ML-IC) assay assesses the fate of multipotent human progenitors in vitro. Blood 93: 3750-3756, 1999. PubMed: 10339481
Thiemann FT, et al. The murine stromal cell line AFT024 acts specifically on human CD34+CD38- progenitors to maintain primitive function and immunophenotype in vitro. Exp. Hematol. 26: 612-619, 1998. PubMed: 9657136
Lewis ID, et al. Umbilical cord blood cells capable of engrafting in primary, secondary, and tertiary xenogeneic hosts are preserved after ex vivo culture in a noncontact system. Blood 97: 3441-3449, 2001. PubMed: 11369635
Fleming, D.O., Richardson, J. H., Tulis, J.J. and Vesley, D., (1995) Laboratory Safety: Principles and Practice. Second edition, ASM press, Washington, DC.
Caputo JL. Biosafety procedures in cell culture. J. Tissue Culture Methods 11:223-227, 1988
Hay RJ, Caputo JL, Macy, ML, Eds. (1992) ATCC Quality Control Methods for Cell Lines. 2nd edition, Published by ATCC.
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