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Aquaporin-1 retards renal cyst development in polycystic kidney disease by inhibition of Wnt signaling #MMPMID25573755
Wang W; Li F; Sun Y; Lei L; Zhou H; Lei T; Xia Y; Verkman AS; Yang B
FASEB J 2015[Apr]; 29 (4): 1551-63 PMID25573755show ga
Water channel aquaporin-1 (AQP1) is expressed at epithelial cell plasma membranes in renal proximal tubules and thin descending limb of Henle. Recently, AQP1 was reported to interact with ?-catenin. Here we investigated the relationship between AQP1 and Wnt signaling in in vitro and in vivo models of autosomal dominant polycystic kidney disease (PKD). AQP1 overexpression decreased ?-catenin and cyclinD1 expression, suggesting down-regulation of Wnt signaling, and coimmunoprecipitation showed AQP1 interaction with ?-catenin, glycogen synthase kinase 3?, LRP6, and Axin1. AQP1 inhibited cyst development and promoted branching in matrix-grown MDCK cells. In embryonic kidney cultures, AQP1 deletion increased cyst development by up to ?40%. Kidney size and cyst number were significantly greater in AQP1-null PKD mice than in AQP1-expressing PKD mice, with the difference mainly attributed to a greater number of proximal tubule cysts. Biochemical analysis revealed decreased ?-catenin phosphorylation and increased ?-catenin expression in AQP1-null PKD mice, suggesting enhanced Wnt signaling. These results implicate AQP1 as a novel determinant in renal cyst development that may involve inhibition of Wnt signaling by an AQP1-macromolecular signaling complex.?Wang, W., Li, F., Sun, Y., Lei, L., Zhou, H., Lei, T., Xia, Y., Verkman, A. S., Yang, B. Aquaporin-1 retards renal cyst development in polycystic kidney disease by inhibition of Wnt signaling.