title: Basic fibroblast growth factor inhibits delta 5-3 beta-hydroxysteroid dehydrogenase-isomerase activity in cultured immature Leydig cells.
abstract: Basic fibroblast growth factor inhibited basal delta 5-3 beta-hydroxysteroid dehydrogenase-isomerase activity in cultured Leydig cells from immature rats in a concentration- and time-dependent manner. Maximal inhibition was achieved with 5-10 ng/ml basic fibroblast growth factor following approximately 48 h of exposure. The inhibition of basal delta 5-3 beta-hydroxysteroid dehydrogenase-isomerase activity was not altered by human chorionic gonadotropin; however, cycloheximide (0.5-2.0 micrograms/ml) partially reversed the effects of basic fibroblast growth factor in a dose-dependent manner. These studies suggest that locally-produced basic fibroblast growth factor may modulate Leydig cell testosterone formation by regulating delta 5-3 beta-hydroxysteroid dehydrogenase-isomerase activity.
authors.affiliation: Research Service, Dorn Veterans' Hospital, Columbia, SC.
authors.forename: E P
authors.initials: EP
authors.lastname: Murono
authors.forename: A L
authors.initials: AL
authors.lastname: Washburn
mesh_terms: D015096:3-Hydroxysteroid Dehydrogenases / Q000037:antagonists & inhibitors*; D000818:Animals; D002478:Cells, Cultured; D006063:Chorionic Gonadotropin / Q000494:pharmacology; D003513:Cycloheximide / Q000494:pharmacology; D005346:Fibroblast Growth Factors / Q000494:pharmacology*; D007985:Leydig Cells / Q000378:metabolism*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013739:Testosterone / Q000096:biosynthesis*
chemical_list: D006063:Chorionic Gonadotropin; D013739:Testosterone; D005346:Fibroblast Growth Factors; D003513:Cycloheximide; D015096:3-Hydroxysteroid Dehydrogenases