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- W2149803734 abstract "The effect of arginine vasopressin (AVP) and/or atrial natriuretic peptide (ANP) on the regulation of intracellular pH (pHi) via H+-ATPase and of cytosolic calcium ([Ca2+]i) was investigated in Madin-Darby canine kidney (MDCK) cells by the fluorescent probes BCECF-AM and fluo-4-AM, respectively. The pHi recovery rate was examined after intracellular acidification following an NH4Cl pulse, in the presence of zero Na+ plus Schering 28080 (a specific inhibitor of H+-K+-ATPase). AVP (10-12-10-6 M) increased the rate of pHi recovery and [Ca2+]i in a dose-dependent manner. V1- or V2-receptor antagonists impaired the effect of AVP on both processes, and DDAVP (10-12-10-6 M; a V2-selective agonist) caused a dose-dependent stimulation of them. [Ca2+]i or cAMP (as increased by 10-5 M thapsigargin or 8-BrcAMP, respectively) alone had no effect on H+-ATPase, but their synergic action was necessary to stimulate H+-ATPase. In agreement with these findings, ANP (10-6 M) or dimethyl-BAPTA-AM (5 x 10-5 M), impairing the increase of [Ca2+]i in response to AVP, blocks the stimulatory effect of AVP on H+-ATPase." @default.
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- W2149803734 date "2004-02-01" @default.
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- W2149803734 title "Arginine vasopressin stimulates H<sup>+</sup>-ATPase in MDCK cells via V<sub>1</sub>(cell Ca<sup>2+</sup>) and V<sub>2</sub>(cAMP) receptors" @default.
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- W2149803734 doi "https://doi.org/10.1152/ajprenal.00121.2003" @default.
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