title: Effects of interaction between estradiol-17 beta and progesterone on the proliferation of cloned breast tumor cells (MCF-7 and T47D).
abstract: We have previously reported that the proliferation of cloned MCF-7 and T47D human mammary tumor cells can be inhibited by increasing concentrations of charcoal-dextran stripped female human serum (CDFHS). The maximal proliferation rate was restored by the addition of 3 X 10(-11) M estradiol-17 beta to the culture media. These observations suggest that the proliferation of T47D and MCF-7 cells is regulated by a blood-borne inhibitor whose effects are neutralized by estrogens. In the present report we explore the possibility that progesterone alters the estrogenic response. MCF-7 cells were grown in DME containing 2-40% CDFHS. Progesterone, at 3 X 10(-7) M to 3 X 10(-12) M, had no effect on the yield of MCF-7 or T47D cells that were cultured in the presence or absence of estradiol-17 beta.
mesh_terms: D001769:Blood; D001943:Breast Neoplasms / Q000473:pathology*; D002452:Cell Count; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002999:Clone Cells / Q000187:drug effects; D004357:Drug Synergism; D004958:Estradiol / Q000494:pharmacology*; D006801:Humans; D011374:Progesterone / Q000494:pharmacology*
chemical_list: D011374:Progesterone; D004958:Estradiol