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- W1899421256 abstract "Experiments were performed on isolated salt-perfused rat lungs to determine the receptor type(s) responsible for the pulmonary vascular effects of the neurohypophyseal peptides arginine vasopressin (AVP) and oxytocin. Bolus administration of AVP to lungs preconstricted with the thromboxane mimetic U-46619 resulted in a dose-dependent vasodilatory response (approximately 65% reversal of U-46619-induced vasoconstriction at the highest dose tested) that was blocked by pretreatment with a selective V1- but not by a selective V2-vasopressinergic receptor antagonist. Administration of a selective V1-agonist to the preconstricted pulmonary vasculature resulted in a vasodilatory response similar to that observed with AVP (approximately 55% reversal of U-46619 vasoconstriction), which was blocked by prior administration of the selective V1-receptor antagonist. Administration of the selective V2-receptor agonist desmopressin to the preconstricted pulmonary vasculature resulted in a small (approximately 8% reversal of U-46619 vasoconstriction) vasodilatory response that was, nevertheless, greater than that produced by addition of vehicle alone and was attenuated by pretreatment with a selective V2-receptor antagonist. Finally, oxytocin also caused vasodilation in the preconstricted pulmonary vasculature; however, the potency of oxytocin was approximately 1% of AVP, and the vasodilation produced by oxytocin was blocked by prior administration of a selective V1-receptor antagonist, suggesting that oxytocin acts via V1-vasopressinergic receptor stimulation. We conclude from these experiments that AVP and oxytocin dilate the preconstricted pulmonary vasculature primarily via stimulation of V1-vasopressinergic receptors. V2-receptor stimulation results in a minor vasodilatory response, although its physiological significance is unclear." @default.
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- W1899421256 date "1992-08-01" @default.
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- W1899421256 title "Pulmonary vasodilatory response to neurohypophyseal peptides in the rat" @default.
- W1899421256 doi "https://doi.org/10.1152/jappl.1992.73.2.473" @default.
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