title: Estrogenic inhibition of the hepatic synthesis of alpha2u globulin in the rat.
abstract: The hepatic synthesis of the androgen-dependent urinary protein in the rat, called alpha2u globulin, is strongly inhibited by estrogens. In mature male rats, treatment with estradiol-17beta (0.5 mug/g body weight) completely inhibits alpha2u synthesis within 6-7 days. Following withdrawal of estrogen treatment alpha 2u synthesis is not reinitiated for approximately 20 days. Parabiotic joining of estrogen-suppressed male rats with their normal littermates within this lag period fails to change the preparabiotic pattern of alpha2u synthesis in the respective partners. Besides estradiol-17beta, other estrane derivatives such as estrone, estriol and estradiol-17alpha were also found to inhibit the synthesis of alpha2u globulin. All of the above estrane derivatives which inhibit alpha2u synthesis are also found to inhibit the uptake of 5alpha-dihydrotestosterone by the hepatic cytosol androgen binding protein of the mature male rat. Unlike cycloheximide, a known translational inhibitor, estradiol-17beta does not inhibit alpha 2u synthesis in the perfused rat liver.
mesh_terms: D000510:Alpha-Globulins / Q000096:biosynthesis* / Q000652:urine; D000818:Animals; D001665:Binding Sites; D003513:Cycloheximide / Q000494:pharmacology; D003600:Cytosol / Q000378:metabolism; D003609:Dactinomycin / Q000494:pharmacology; D013196:Dihydrotestosterone / Q000494:pharmacology; D004958:Estradiol / Q000494:pharmacology; D004964:Estriol / Q000494:pharmacology; D004967:Estrogens / Q000494:pharmacology*; D004970:Estrone / Q000494:pharmacology; D005260:Female; D008099:Liver / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D010227:Parabiosis; D010477:Perfusion; D051381:Rats; D011956:Receptors, Cell Surface / Q000187:drug effects
chemical_list: D000510:Alpha-Globulins; D004967:Estrogens; D011956:Receptors, Cell Surface; D013196:Dihydrotestosterone; D003609:Dactinomycin; D004970:Estrone; D004958:Estradiol; D003513:Cycloheximide; D004964:Estriol