title: 5alpha-Reductase and 3alpha-hydroxysteroid oxidoreductase enzyme activities in epididymis and their control by androgen and the rete testis fluid.
abstract: The 5alpha-reductase and 3alpha-hydroxysteroid oxidoreductase enzyme activities have been measured in epididymal tissues and the control of these activities by androgens and the rete testis fluid appreciated. The highest 5alpha-reductase enzyme activity was found in the caput, the lowest in the corpus epididymidis. Androgens have a positive control on the 5alpha-reductase but no effect on the 3alpha-hydroxysteroid oxidoreductase activity. Ligation of the efferent ducts decreased significantly both enzyme activities in the caput but not in the corpus or in the cauda epididymidis.
mesh_terms: D015096:3-Hydroxysteroid Dehydrogenases / Q000378:metabolism*; D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase / Q000378:metabolism*; D000818:Animals; D002369:Castration; D013196:Dihydrotestosterone; D004822:Epididymis / Q000187:drug effects / Q000201:enzymology*; D008297:Male; D010088:Oxidoreductases / Q000378:metabolism*; D051381:Rats; D012152:Rete Testis / Q000502:physiology*; D013737:Testis / Q000502:physiology*; D013739:Testosterone / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D013196:Dihydrotestosterone; D013739:Testosterone; D010088:Oxidoreductases; D015096:3-Hydroxysteroid Dehydrogenases; D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase