title: Structure and steroidogenic enzymes of the seminal vesicles of the urohaze-goby (Glossogobius olivaceus).
abstract: The in vitro steroid metabolism in the seminal vesicles of the brackish water goby (urohaze-goby, Glossogobius olivaceus) was studied using males in the breeding season. The moderate activity of delta 5-3 beta-hydroxysteroid dehydrogenase was histochemically detected only in the epithelial cells of the organ, though these cells have the characteristics of secretory cells ultrastructurally. Cell-free homogenates (800 g supernatant fluid) of the whole tissue were aerobically incubated with 14C-labeled pregnenolone, progesterone, 17 alpha-hydroxyprogesterone, androstenedione, dehydroepiandrosterone, or testosterone in the presence of NAD+ or NADPH. Pregnenolone and dehydroepiandrosterone were converted to progesterone and androstenedione, respectively. Progesterone was transformed to 5 alpha-pregnane-3,20-dione (main product) and 17 alpha-hydroxyprogesterone. 17 alpha-Hydroxyprogesterone was metabolized into androstenedione (main product) and 17 alpha-hydroxy-5 alpha-pregnane-3,20-dione. From androstenedione, 5 alpha-androstane-3,17-dione (main product) and epiandrosterone were obtained. Testosterone was transformed to 5 alpha-dihydrotestosterone, 5 alpha-androstane-3 beta, 17 beta-diol, 5 alpha-androstane-3,17-dione, and androstenedione. These results indicate that the steroid metabolic patterns in the seminal vesicles of G. olivaceus are closely resembled to those in the testes.
authors.affiliation: College of Agriculture and Veterinary Medicine, Nihon University, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Asahina
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Hibiya
authors.forename: B
authors.initials: B
authors.lastname: Tamaoki
mesh_terms: D000728:Androgens / Q000378:metabolism*; D000818:Animals; D005399:Fishes / Q000378:metabolism*; D008297:Male; D011284:Pregnenolone / Q000378:metabolism*; D011374:Progesterone / Q000378:metabolism*; D012669:Seminal Vesicles / Q000166:cytology / Q000201:enzymology* / Q000648:ultrastructure
chemical_list: D000728:Androgens; D011374:Progesterone; D011284:Pregnenolone