title: A serine-proteinase inhibitor (Boc-D-Phe-Pro-Arg-H) inhibits the secretion of adrenocorticotropin- and beta-endorphin-immunoreactive peptides in vitro.
abstract: The effects of a potent serine protease inhibitor, Boc-D-Phe-Pro-Arg-H, on the secretion and content of ACTH and beta-endorphin-like immunoreactivities of cultured rat anterior pituitary cells were studied. Basal release of the hormones was not affected by the drug but secretion in response to stalk-median eminence extracts was inhibited. The inhibitor did not effect the amount of ACTH or beta-endorphin in the medium plus the cells, nor did it change the ratio of the lipotropin and beta-endorphin-like immunoreactivities. Thus the compound seems to affect the release of ACTH and beta-endorphin, but not the processing of lipotropin to beta-endorphin.
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000378:metabolism*; D000818:Animals; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D004723:Endorphins / Q000378:metabolism*; D005260:Female; D008473:Median Eminence / Q000378:metabolism; D009842:Oligopeptides / Q000008:administration & dosage / Q000494:pharmacology*; D010903:Pituitary Gland, Anterior / Q000378:metabolism; D011480:Protease Inhibitors / Q000494:pharmacology*; D051381:Rats; D001615:beta-Endorphin; D008083:beta-Lipotropin / Q000378:metabolism
chemical_list: D004723:Endorphins; D009842:Oligopeptides; D011480:Protease Inhibitors; D001615:beta-Endorphin; C030798:tert-butyloxycarbonyl-phenylalanyl-prolyl-arginal; D000324:Adrenocorticotropic Hormone; D008083:beta-Lipotropin