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• W1525221498 abstract "Vasopressin secreted by parvocellular neurones of the hypothalamic paraventricular nucleus modulates pituitary adrenocorticotrophic hormone (ACTH) secretion by acting upon vasopressin V1b type receptors in the pituitary corticotroph coupled to phospholipase C. Regulation of V1b receptors contributes to the adaptation of the hypothalamic-pituitary-adrenal (HPA) axis to stress, as evidenced by the correlation between vasopressin receptor number and pituitary ACTH responsiveness. V1b receptor upregulation during chronic stress is associated with elevated circulating glucocorticoids and vasopressin expression in parvocellular neurones, suggesting that these factors control V1b receptor expression. Removal of circulating glucocorticoids by adrenalectomy causes sustained vasopressin receptor downregulation, but reduces V1b receptor mRNA only transiently. The latter effect is not mediated by increased corticotrophin-releasing hormone (CRH) and vasopressin release, since it is not prevented by lesions of the hypothalamic paraventricular nucleus. Adrenalectomy causes sustained V1b receptor loss in Brattleboro rats, which lack hypothalamic vasopressin, suggesting that vasopressin mediates V1b receptor mRNA recovery. Exogenous glucocorticoid administration downregulates pituitary vasopressin binding but increases V1b receptor mRNA and facilitates coupling of the receptor to phospholipase C, effects which may contribute to the refractoriness of vasopressin actions to glucocorticoid feedback. The lack of parallelism between changes in pituitary vasopressin binding and V1b receptor mRNA levels during manipulation of the HPA axis indicates that V1b receptor content depends on post-transcriptional mechanisms rather than steady-state V1b receptor mRNA levels. These studies suggest that interaction between glucocorticoids and vasopressin plays an important role in regulating V1b receptor mRNA expression during alterations of the HPA axis. In addition, the recent characterization of a major part of the V1b receptor gene provides a basis for studying the molecular mechanisms regulating the V1b receptor." @default.
• W1525221498 created "2016-06-24" @default.
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• W1525221498 date "2000-03-01" @default.
• W1525221498 modified "2023-10-14" @default.
• W1525221498 title "Regulation of vasopressin V_1breceptors in the anterior pituitary gland of the rat" @default.
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• W1525221498 doi "https://doi.org/10.1111/j.1469-445x.2000.tb00004.x" @default.
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