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• W2768761539 endingPage "e0188006" @default.
• W2768761539 startingPage "e0188006" @default.
• W2768761539 abstract "The final adjustment of urine volume occurs in the inner medullary collecting duct (IMCD), chiefly mediated by the water channel aquaporin 2 (AQP2). With vasopressin stimulation, AQP2 accumulation in the apical plasma membrane of principal cells allows water reabsorption from the lumen. We report that FXYD1 (phospholemman), better known as a regulator of Na,K-ATPase, has a role in AQP2 trafficking. Daytime urine of Fxyd1 knockout mice was more dilute than WT despite similar serum vasopressin, but both genotypes could concentrate urine during water deprivation. FXYD1 was found in IMCD. In WT mice, phosphorylated FXYD1 was detected intracellularly, and vasopressin induced its dephosphorylation. We tested the hypothesis that the dilute urine in knockouts was caused by alteration of AQP2 trafficking. In WT mice at baseline, FXYD1 and AQP2 were not strongly co-localized, but elevation of vasopressin produced translocation of both FXYD1 and AQP2 to the apical plasma membrane. In kidney slices, baseline AQP2 distribution was more scattered in the Fxyd1 knockout than in WT. Apical recruitment of AQP2 occurred in vasopressin-treated Fxyd1 knockout slices, but upon vasopressin washout, there was more rapid reversal of apical AQP2 localization and more heterogeneous cytoplasmic distribution of AQP2. Notably, in sucrose gradients, AQP2 was present in a detergent-resistant membrane domain that had lower sedimentation density in the knockout than in WT, and vasopressin treatment normalized its density. We propose that FXYD1 plays a role in regulating AQP2 retention in apical membrane, and that this involves transfers between raft-like membrane domains in endosomes and plasma membranes." @default.
• W2768761539 created "2017-12-04" @default.
• W2768761539 creator A5040397891 @default.
• W2768761539 creator A5070466127 @default.
• W2768761539 creator A5076939875 @default.
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• W2768761539 date "2017-11-20" @default.
• W2768761539 modified "2023-09-26" @default.
• W2768761539 title "Impaired AQP2 trafficking in Fxyd1 knockout mice: A role for FXYD1 in regulated vesicular transport" @default.
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• W2768761539 doi "https://doi.org/10.1371/journal.pone.0188006" @default.
• W2768761539 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5695786" @default.
• W2768761539 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29155857" @default.
• W2768761539 hasPublicationYear "2017" @default.
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