Summary
A new medium (MCDB 104) has been developed which will support clonal growth of WI-38 cells at concentrations of serum protein as low as 25 μg per ml (equivalent to 0.05% serum). The principal factors responsible for reduction of the protein requirement are: (a) adjustment of all nutrient concentrations in medium F12 to experimentally determined optimum values for WI-38 cells; (b) supplementation with trace elements; (c) replacement of hypoxanthine and folic acid with adenine and folinic acid; and (d) coating of the culture surface with polylysine. Individually, many of these modifications exert only a small effect on cellular growth at reduced protein concentrations, but collectively their effect has been very substantial. Other strains of fibroblast-like human diploid cells from amniotic fluid, fetal lung and newborn foreskin also will grow at reduced concentrations of serum protein in the new medium.
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This work was supported by Grant No. AG00310 from the National Institute on Aging, and by Contract No. 223-74-1156 from the Bureau of Biologics, U.S. Food and Drug Administration.
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McKeehan, W.L., McKeehan, K.A., Hammond, S.L. et al. Improved medium for clonal growth of human diploid fibroblasts at low concentrations of serum protein. In Vitro 13, 399–416 (1977). https://doi.org/10.1007/BF02615100
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DOI: https://doi.org/10.1007/BF02615100