title: Estrogen regulation of tissue plasminogen activator in a human melanoma cell line.
abstract: The influence of ethinylestradiol and the three natural estrogens, i.e. estrone, 17-beta-estradiol and estriol, was studied in a melanoma cell line producing a tissue-type plasminogen activator (t-PA). The cell cultures were exposed to the four estrogens by addition of the steroids dissolved in a weak alcoholic solution to the culture media, in which the released t-PA was assayed by an immunoradiometric method. Ethanol (0.76% w/v) stimulated the t-PA production, while no significant effect of the estrogens in the concentration of 1.7 X 10(-7) M was seen. By tenfold increase in estrogen concentration a highly significant reduction of t-PA levels was recorded in the cultures exposed to ethinylestradiol and 17-beta-estradiol. Estriol differed from these two estrogens in having rather weak inhibitory effect; whereas estrone in this concentration had toxic effect on melanoma cells. It was concluded that the present estrogens, in particular ethinylestradiol and 17-beta-estradiol, had a dose-dependent inhibitory effect on the production of t-PA in melanoma cell culture.
mesh_terms: D002460:Cell Line; D003864:Depression, Chemical; D004305:Dose-Response Relationship, Drug; D004958:Estradiol / Q000494:pharmacology; D004964:Estriol / Q000494:pharmacology; D004967:Estrogens / Q000494:pharmacology*; D004970:Estrone / Q000494:pharmacology; D004997:Ethinyl Estradiol / Q000494:pharmacology; D006801:Humans; D008545:Melanoma / Q000378:metabolism*; D010959:Tissue Plasminogen Activator / Q000378:metabolism*
chemical_list: D004967:Estrogens; D004970:Estrone; D004997:Ethinyl Estradiol; D004958:Estradiol; D010959:Tissue Plasminogen Activator; D004964:Estriol