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• W2024003460 abstract "It has previously been demonstrated in our laboratory that patients with pseudohypoparathyroidism (PsHP) have impaired PRL responses to TRH and chlorpromazine. We have also observed that these patients have low basal plasma renin activity (PRA) and decreased aldosterone responses to upright posture and isometric handgrip exercise. Since inhibitory dopaminergic modulation of PRL and aldosterone is well established, we have examined whether PsHP is associated with altered dopaminergic inhibition of PRL and aldosterone secretion. To investigate this possibility, we compared the plasma PRL, aldosterone, and PRA responses to the dopamine antagonist metoclopramide (MCP; 10 mg iv) in seven normocalcemic PsHP patients and twelve normal controls. These patients were on no medications except calcium and vitamin D for 2 weeks; they were maintained on a diet containing 50 meq of sodium and 80 meq of potassium for 5 days. Although basal PRL levels were similar in the two groups of subjects, the maximal incremental PRL response in PsHP patients (38.7 +/- 12.6 ng/ml) was less (P less than 0.01) than in normal subjects (61.6 +/- 9.6 ng/ml). Basal supine plasma aldosterone was less (P less than 0.01) in PsHP patients (8.0 +/- 1.1 ng/dl) than in normal subjects (13.4 +/- 2.1 ng/dl). Maximum incremental aldosterone response to MCP (8.7 +/- 1.9 ng/dl) in PsHP patients was also less (P less than 0.01) than in normal subjects (13.4 +/- 2.1 ng/dl). Basal supine PRA was lower (P less than 0.05) in PsHP patients (1.3 +/- 0.3 ng/ml.h) than in normal subjects (2.8 +/- 0.4 ng/ml.h). However, the PRA responses to MCP were similar in both groups. Tonic dopaminergic inhibition of PRL and aldosterone secretion, but not renin secretion, appears to be less pronounced in PsHP patients. This is the first disease state in which reduced aldosterone responses to dopamine antoganism have been observed. Decreased PRL and aldosterone responses to MCP may reflect decreased ambient dopamine levels and/or a reduction in dopamine receptor number or binding affinity." @default.
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• W2024003460 date "1981-05-01" @default.
• W2024003460 modified "2023-09-28" @default.
• W2024003460 title "Altered Dopaminergic Modulation of Prolactin and Aldosterone Secretion in Pseudohypoparathyroidism*" @default.
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• W2024003460 doi "https://doi.org/10.1210/jcem-52-5-914" @default.
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