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- W2017992757 abstract "The endothelins (ET) have been implicated in vasopressin (AVP) release in vivo and in vitro. The effects of ET in this system are complex, and the net AVP secretory response likely depends on a unique combination of ET isoform, ET receptor subtype, and neural locus. The purpose of these studies was to examine the role of ET receptor subtypes at hypothalamic vs. neurohypophysial sites on somatodendritic and neurohypophysial AVP secretion. Experiments were done in cultured explants of the hypothalamo-neurohypophysial system of Long Evans rats. Either the whole explant (standard) or only the hypothalamus or posterior pituitary (compartmentalized) was exposed to log dose increases (0.01-10 nM) of the agonists ET-1 (ET(A) selective), ET-3 (nonselective), or IRL-1620 (ET(B) selective) with or without selective ET(A) (BQ-123, 2-200 nM) or ET(B) (IRL-1038, 6-600 nM) receptor antagonism. In standard explants, ET-1 and ET-3 dose-dependently increased, whereas IRL-1620 decreased net AVP release. Hypothalamic ET(B) receptor activation increased both somatodendritic and neurohypophysial AVP release. At least one intervening synapse was involved, as tetrodotoxin blocked the response. Activation of ET(A) receptors at the hypothalamic level inhibited, whereas ET(A) receptor activation at the posterior pituitary stimulated, neurohypophysial AVP secretion. Antagonism of hypothalamic ET(A) receptors potentiated the stimulatory effect of ET-1 and ET-3 on neurohypophysial secretion, an effect not observed with ET(B) receptor-induced somatodendritic release of AVP. Thus the response of whole explants reflects the net result of both stimulatory and inhibitory inputs. The integration of these excitatory and inhibitory inputs endows the vasopressinergic system with greater plasticity in its response to physiological and pathophysiological states." @default.
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- W2017992757 date "2004-04-01" @default.
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- W2017992757 title "Regulation of vasopressin secretion by ET<sub>A</sub> and ET<sub>B</sub> receptors in compartmentalized rat hypothalamo-neurohypophysial explants" @default.
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- W2017992757 doi "https://doi.org/10.1152/ajpendo.00344.2003" @default.
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