Abstract
This study was designed to investigate dopaminergic mechanisms involved in the control of corticosteroid secretion. Plasma renin activity (PRA), prolactin, cortisol, corticosterone, 11-deoxycorticosterone, 18-hydroxycorticosterone (18-OHB) and aldosterone responses to metoclopramide 10 mg iv in the presence of a vehicle or dopamine (3 microgram/kg/min) infusions, or domperidone 10 mg iv were evaluated in 10 normal males. Metoclopramide, and the peripheral dopamine antagonist, domperidone both resulted in rises in serum prolactin levels. Metoclopramide, but not domperidone, resulted in parallel rises in plasma 18-OHB and aldosterone levels. Dopamine infusion markedly inhibited prolactin, 18-OHB and aldosterone responses to the central and peripheral dopamine antagonist metoclopramide. Administration of the dopamine agonist, bromocriptine, 2.5 mg three times a day for 4 days suppressed (P less than 0.01) mean 24 h plasma 18-OHB levels from 22.1 +/- 2.1 to 15.8 +/- 1.5 ng/dl. These results suggest that dopaminergic mechanisms modulate the secretion of 18-OHB and aldosterone. The circadian rhythm of 18-OHB secretion is not dependent on dopaminergic mechanisms.
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