EFFECT OF OESTRADIOL ON GONADOTROPHIN RELEASE INDUCED BY LHRH IN MEN

SUMMARY In order to study the role of the oestradiol on the feed-back mechanism, fourteen men were subjected to LHRH test before and after treatment with oestradiol. The oestrogen was administered i.m., 3 μg/kg/24 h and 150 μg/kg/24 h, in two groups of patients. Doses of 3 and 150 μg respectively produced a reduction of LH release of 74% and 60% below control. FSH response to LHRH was almost abolished by oestrogens. Our findings show that oestrogensin men decrease the pituitary response to LHRH.