Prolactin modulation of dehydroepiandrosterone sulfate secretion.
To clarify the controversy about the effect of prolactin (PRL) on dehydroepiandrosterone sulfate (DHEA-S), this study was undertaken to investigate the effects of alterations in plasma PRL on plasma DHEA-S concentrations in hyperprolactinemic women, as well as in normal male subjects. DHEA-S was measured in a group of 21 women with hyperprolactinemia, galactorrhea, and amenorrhea (PRL:257 +/- 89 ng/ml; mean +/- SEM). In these women, mean plasma concentrations of DHEA-S (2.54 +/- 0.2 microgram/ml) were significantly higher (p < 0.005) than those in 41 normal control women (1.78 z microgram/ml) and those in a group of 11 amenorrheic patients (1.77 +/- 0.2 microgram/ml). Eight women with hyperprolactinemia were given 5 mg of bromocriptine each day for 4 consecutive weeks. Within 1 week of medication, PRL levels fell by 60% (p < 0.05). To test whether lowering normal plasma levels of PRL would affect plasma concentrations of DHEA-S, five normal male subjects received a 48-hour infusion of dopamine at an average rate of 6 microgram/kg/min. Plasma levels of PRL fell by 60% (p < 0.01) after 8 hours of infusion, and DHEA-S decreased by 27% by 16 hours (p < 0.05). These data suggest that PRL modulates the secretion of DHEA-S: an increase in plasma levels of PRL is correlated with elevated concentrations of DHEA-S, whereas a decrease in PRL is followed by a fall in DHEA-S.
D000328:Adult; D000568:Amenorrhea / Q000097:blood*; D000728:Androgens / Q000097:blood; D001971:Bromocriptine / Q000494:pharmacology; D003687:Dehydroepiandrosterone / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors / Q000097:blood; D019314:Dehydroepiandrosterone Sulfate; D004298:Dopamine / Q000494:pharmacology; D005260:Female; D005687:Galactorrhea / Q000097:blood*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D007775:Lactation Disorders / Q000097:blood*; D008297:Male; D011247:Pregnancy; D011388:Prolactin / Q000037:antagonists & inhibitors / Q000097:blood*
D000728:Androgens; D001971:Bromocriptine; D003687:Dehydroepiandrosterone; D019314:Dehydroepiandrosterone Sulfate; D011388:Prolactin; D004298:Dopamine; D006854:Hydrocortisone