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- W2417804698 abstract "A number of structurally novel cyclic hexapeptides have been characterized as potent and selective oxytocin (OT) antagonists in vitro. As a representative of this class of compounds, L-366,948 [[cyclo(L-prolyl-D-2-naphthylalanyl-L-isoleucyl-D-pipecolyl- L-pipecolyl-D- histidyl)]] exhibited a high binding affinity (Ki, low nanomolar) for OT receptors in rat (uterus and mammary) and primate (pregnant rhesus and human myometrium) tissue with a several hundred-fold binding selectivity vs. rat arginine vasopressin (AVP)-V1 (liver) and AVP-V2 (kidney medulla) receptors. In functional assays, L-366,948 was a pure OT antagonist, blocking both OT-stimulated contraction of the isolated rat uterus (pA2, 8.5) and phosphatidylinositol turnover in uterine slices (IC50, 40 vs. 3 nM OT), with no evidence of partial agonist activity. L-366,948 was comparatively weak as an antagonist of AVP-induced contraction of the isolated rat tail artery (AVP-V1 receptor) and AVP-stimulated adenylate cyclase (AVP-V2 receptor) activity in rat kidney medulla and did not influence prostaglandin F2 alpha- or bradykinin-induced contractions of the isolated rat uterus. L-366,948 and related compounds described in this report represent new experimental tools for the study of the pharmacology and physiology of OT." @default.
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- W2417804698 date "1991-01-01" @default.
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- W2417804698 title "In vitro pharmacological profile of a novel structural class of oxytocin antagonists." @default.
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