title: Effect of cyproterone acetate acutely administered on the pituitary-testicular axis.
abstract: The effect of cyproterone acetate (CA) on the pituitary-testicular axis was studied in 6 healthy men. A dose of 300 mg of CA was administered orally in the early morning, after 3 h blood samples were collected using a multiple sample technique. Testosterone (T) levels were decreased by CA in all subjects (p 0.01), LH in all (p less than 0.01) but one whereas 17-hydroxyprogesterone did not show any significant variation. In vitro, using an equilibrium dialysis, CA displaced T from plasma-binding proteins in males at 37 degrees C. The role of testosterone-binding globulin on the effects of CA on the pituitary-testicular axis remains to be clarified.
mesh_terms: D000293:Adolescent; D000328:Adult; D003534:Cyproterone; D006801:Humans; D006908:Hydroxyprogesterones / Q000097:blood; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D010902:Pituitary Gland / Q000187:drug effects / Q000502:physiology*; D011863:Radioimmunoassay; D013737:Testis / Q000187:drug effects / Q000502:physiology*; D013739:Testosterone / Q000097:blood
chemical_list: D006908:Hydroxyprogesterones; D013739:Testosterone; D007986:Luteinizing Hormone; D003534:Cyproterone