Summary
Fetal bovine sera from each of three different commercial sources were tested for their ability to support cloning of human fibroblastoid cells in vitro. Cloning efficiencies varied according to serum source. Serum (10 samples) from company A did not support growth, while sera (10 samples) from companies B and C provided adequate to excellent conditions for cloning and growth. Cells from neonatal foreskin or embryonic lung responded to each serum similarly. Bovine serum albumin type H7 from company C supported cell growth in media without serum.
Sera containing 1.0 ng per ml or more of progesterone inhibited growth, whereas sera containing less than 1.0 ng per ml supported cloning and growth. In the low progesterone sera, the concentration of 17-β-estradiol exceeded 100 pg per ml. Growth supporting sera could be made non-supportive by adding 0.1 μg per ml of progesterone. The addition to non-supportive sera of 0.1 μg per ml of 17-β-estradiol or hydrocortisone made these sera supportive of cell growth.
Addition of estrogen or hydrocortisone to a culture medium that inhibits growth, with subsequent reversal of the inhibitory effect, implies that these hormones competitively regulate growth of responsive cells in vitro.
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Supported in part by NIH-NCI-EC2074.
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Milo, G.E., Malarkey, W.B., Powell, J.E. et al. Effects of steroid hormones in fetal bovine serum on plating and cloning of human cells in vitro. In Vitro Cell.Dev.Biol.-Plant 12, 23–30 (1976). https://doi.org/10.1007/BF02832789
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DOI: https://doi.org/10.1007/BF02832789