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Because thyrotropin deficiency may occur in pseudohypoparathyroidism, we studied pituitary function in two families with this condition. Six of eight patients had impaired pituitary prolactin secretion after administration of thyrotropin-releasing hormone and chlorpromazine, with preservation of other anterior pituitary functions. Peak serum prolactin levels after thyrotropin-releasing hormone and chlorpromazine in the prolactin-deficient patients were significantly lower than normal. Administration of diethylstilbestrol for five days, which normally enhances prolactin responses to thyrotropin-releasing hormone, had no effect on prolactin secretion in these patients. Although antilactotroph antibodies were not demonstrable, hypothyroidism or decreased thyroid reserve in four and antithyroid and antiparietal-cell antibodies in several family members suggest that an associated autoimmune process may be responsible for the prolactin deficiency.
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