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. 1991 Jun;87(6):2122–2126. doi: 10.1172/JCI115243

Vasopressin-stimulated phosphoinositide hydrolysis in cultured rat inner medullary collecting duct cells is mediated by the oxytocin receptor.

I Teitelbaum 1
PMCID: PMC296969  PMID: 1645753

Abstract

Studies were performed to identify the receptor that mediates AVP-stimulated phosphoinositide (PI) hydrolysis in cultured rat inner medullary collecting tubule (RIMCT) cells. While the selective V1 receptor agonist [Ho1, Phe2, Orn8] VT has no effect on inositol trisphosphate (IP3) production over the range of 10(-13)-10(-7) M, the selective V2 receptor agonist VDAVP stimulates IP3 production in dose-dependent fashion. Oxytocin stimulates IP3 production in dose-dependent fashion as well. AVP-stimulated phospholipase C activity is not inhibited by the V1 receptor antagonist d(CH2)5Tyr(Me)AVP(10(-7) M) but is eliminated by the V2 receptor antagonist d(CH2)5DTyr(Et)VAVP (10(-7) M). Similarly, the response to oxytocin is eliminated by the V2 receptor antagonist. The selective oxytocin receptor agonist [Thr4, Gly7] oxytocin does not stimulate cAMP production in RIMCT cells but does promote PI hydrolysis. The selective oxytocin receptor antagonist desGlyNH2d(CH2)5[Tyr(Me)-Thr4]OVT (10(-7) M) does not inhibit AVP-stimulated cAMP production but eliminates IP3 production in response to AVP or the V2 receptor agonist VDAVP. These studies demonstrate that AVP or a V2 receptor agonist stimulate PI hydrolysis in cultured RIMCT cells via occupancy of the oxytocin receptor.

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Selected References

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