title: Retention of estrogen receptors in vitro requires limited estradiol exposure in vivo.
abstract: Maintenance of functional estrogen receptors in culture has been accomplished in chick oviduct cells by manipulating the estrogen exposure before tissue dissociation. Tissue from chicks pre-treated with daily 17-beta-estradiol injections for 2 weeks or with 2 weekly diethylstilbestrol implants can be established in culture using a variety of enzymes. Tissue from animals with chronic estrogen stimulation must be withdrawn from hormone in culture at least 4 days before the digestion procedure. When tissue is digested using collagenase and pancreatin buffered by bovine serum albumin (Fraction V), large quantities of virtually fibroblast-free cultures can be established. The estrogen and progesterone receptors remain intact at normal levels using this procedure. The receptors have maintained biological function as evidenced by two hormone-dependent measurements. The first was an increase in the amount of ovalbumin mRNA transcribed in response to estrogen supplementation of the cultures compared to cultures with no estrogen. The second function was an increase in ovalbumin protein secreted into the medium upon estrogen stimulation. The protein increment demonstrated that the hormone-induced levels of mRNA were functional and capable of being translated.
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism; D002478:Cells, Cultured; D002645:Chickens; D003593:Cytoplasm / Q000378:metabolism; D004054:Diethylstilbestrol / Q000494:pharmacology; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D007700:Kinetics; D010047:Ovalbumin / Q000096:biosynthesis; D010057:Oviducts / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D011960:Receptors, Estrogen / Q000187:drug effects / Q000378:metabolism*; D011980:Receptors, Progesterone / Q000378:metabolism; D013997:Time Factors
chemical_list: D012333:RNA, Messenger; D011960:Receptors, Estrogen; D011980:Receptors, Progesterone; D004958:Estradiol; D004054:Diethylstilbestrol; D010047:Ovalbumin