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• W2019386082 abstract "Previous studies have suggested that certain cases of idiopathic central hypothyroidism of hypothalamic origin may result from the secretion of biologically inactive thyrotropin. To investigate this possibility and to define the mechanism of defective hormone action, we measured the adenylate cyclase–stimulating bioactivity (B) and receptor-binding (R) activity of purified immunoreactive serum thyrotropin (I) from seven patients with hypothalamic hypothyroidism. We found a strikingly decreased R/I ratio (<0.15) in patients as compared with controls (0.6 to 2.7) and a similarly decreased B/I ratio (<0.2 vs. 2.8 to 5.6). After acute injection of thyrotropin-releasing hormone (TRH, 200 μg intravenously), the R/I ratio increased in two of three patients, but the B/I ratio became normal in only one. After administration of TRH for 20 to 30 days, an increase in immunoreactive serum thyrotropin was observed in all patients. Moreover, both ratios returned to normal in all but one patient, who had apparent desensitization. The increase in the amount and bioactivity of secreted thyrotropin after long-term TRH therapy resulted in enhanced secretion of serum thyroid hormones in all patients studied. We conclude that in certain cases of hypothalamic hypothyroidism, secreted thyrotropin lacks biologic activity because of impaired binding to its receptor; TRH treatment can correct both defects. These data suggest that TRH regulates not only the secretion of thyrotropin but also its specific molecular and conformational features required for hormone action. (N Engl J Med 1985; 312: 1085–90.)" @default.
• W2019386082 created "2016-06-24" @default.
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• W2019386082 date "1985-04-25" @default.
• W2019386082 modified "2023-09-27" @default.
• W2019386082 title "Decreased Receptor Binding of Biologically Inactive Thyrotropin in Central Hypothyroidism" @default.
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• W2019386082 doi "https://doi.org/10.1056/nejm198504253121703" @default.
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