title: Anti-androgen TSAA-291. IV. Effects of the anti-androgen TSAA-291 (16 beta-ethyl-17 beta-hydroxy-4-oestren-3-one) on the secretion of gonadotrophins.
abstract: Effects of the anti-androgen TSAA-291 on the gonadotrophin secretion were studied. (1) A single subcutaneous or oral administration of TSAA-291 and its caproate induced the ovulation in the proestrous rat of which the spontaneous ovulation was blocked by the treatment with chlorpromazine. (2) A single subcutaneous administration of TSAA-291 at 2.4 mg/kg to the adult male rat induced only a slight elevation in the serum LH and FSH levels at 30 min after the administration. Successive intramuscular administrations of TSAA-291 to the adult male rat for 2 or 4 weeks resulted in significant decreases in the serum LH and FSH levels at high dose levels. A dose-dependent decrease in the serum LH level but not FSH level was observed in the orchiectomized rat. (3) Successive intramuscular administrations of TSAA-291 at high dose levels to the male rat suppressed the plasma testosterone level in the testicular venous blood and general circulation.
mesh_terms: D000284:Administration, Oral; D000726:Androgen Antagonists / Q000008:administration & dosage / Q000494:pharmacology; D000818:Animals; D002369:Castration; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood / Q000378:metabolism*; D007279:Injections, Subcutaneous; D007986:Luteinizing Hormone / Q000097:blood / Q000378:metabolism*; D008297:Male; D009277:Nandrolone / Q000031:analogs & derivatives* / Q000494:pharmacology; D010060:Ovulation / Q000187:drug effects; D011247:Pregnancy; D011359:Proestrus / Q000187:drug effects; D011863:Radioimmunoassay; D051381:Rats; D013739:Testosterone / Q000097:blood / Q000494:pharmacology
chemical_list: D000726:Androgen Antagonists; D013739:Testosterone; D009277:Nandrolone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone