title: In vitro modulation of porcine Leydig cell steroidogenesis by phorbol-12-myristate-13-acetate and 1,2-dioctanoylglycerol.
abstract: Serum-free primary cultures of neonatal (1-day-old) porcine Leydig cells were used to study the effects of phorbol-12-myristate-13-acetate and 1,2-dioctanoylglycerol on testosterone and pregnenolone production. Phorbol-12-myristate-13-acetate alone from 0.001-10 mumol/l stimulated testosterone and pregnenolone production, whereas 1,2-dioctanoylglycerol alone had no effect on steroid production, relative to control. Phorbol-12-myristate-13-acetate and 1,2-dioctanoylglycerol each inhibited pLH-stimulated testosterone and pregnenolone production. To further clarify the influence of these protein kinase C activators on steroidogenesis, cultured Leydig cells were treated with either phorbol-12-myristate-13-acetate or 1,2-dioctanoylglycerol plus forskolin (an adenylate cyclase activator). Both phorbol-12-myristate-13-acetate and 1,2-dioctanoylglycerol inhibited forskolin-stimulated testosterone production. Phorbol-12-myristate-13-acetate had no effect on forskolin-stimulated pregnenolone production and only the highest concentration of 1,2-dioctanoylglycerol (100 mumol/l) inhibited forskolin-stimulated production of pregnenolone. These data demonstrate that porcine Leydig cell steroidogenesis can be modulated by interactions of the protein kinase C and protein kinase A second messenger systems.
authors.affiliation: Department of Animal Science, Texas A&M University, College Station.
authors.forename: J T
authors.initials: JT
authors.lastname: French
authors.forename: T H
authors.initials: TH
authors.lastname: Welsh
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D004075:Diglycerides / Q000494:pharmacology*; D004357:Drug Synergism; D005989:Glycerides / Q000494:pharmacology*; D066298:In Vitro Techniques; D007985:Leydig Cells / Q000187:drug effects* / Q000378:metabolism; D007986:Luteinizing Hormone / Q000494:pharmacology; D008297:Male; D011284:Pregnenolone / Q000096:biosynthesis*; D015290:Second Messenger Systems / Q000502:physiology*; D013552:Swine; D013739:Testosterone / Q000096:biosynthesis*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D004075:Diglycerides; D005989:Glycerides; C044295:1,2-dioctanoylglycerol; D013739:Testosterone; D011284:Pregnenolone; D007986:Luteinizing Hormone; D013755:Tetradecanoylphorbol Acetate