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- W2018071317 abstract "AS160, a novel Akt substrate of 160 kDa, contains a Rab GTPase-activating protein (GAP) domain. The present study examined the role of Akt and AS160 in aquaporin-2 (AQP2) trafficking. The main strategy was to examine the changes in AQP2 translocation in response to small interfering RNA (siRNA)-mediated AS160 knockdown in mouse cortical collecting duct cells (M-1 cells and mpkCCDc14 cells). Short-term dDAVP treatment in M-1 cells stimulated phosphorylation of Akt (S473) and AS160, which was also seen in mpkCCDc14 cells. Conversely, the phosphoinositide 3-kinase (PI3K) inhibitor LY 294002 diminished phosphorylation of Akt (S473) and AS160. Moreover, siRNA-mediated Akt1 knockdown was associated with unchanged total AS160 but decreased phospho-AS160 expression, indicating that phosphorylation of AS160 is dependent on PI3K/Akt pathways. siRNA-mediated AS160 knockdown significantly decreased total AS160 and phospho-AS160 expression. Immunocytochemistry revealed that AS160 knockdown in mpkCCDc14 cells was associated with increased AQP2 density in the plasma membrane [135 ± 3% of control mpkCCDc14 cells ( n = 65), P < 0.05, n = 64] despite the absence of dDAVP stimulation. Moreover, cell surface biotinylation assays of mpkCCDc14 cells with AS160 knockdown exhibited significantly higher AQP2 expression [150 ± 15% of control mpkCCDc14 cells ( n = 3), P < 0.05, n = 3]. Taken together, PI3K/Akt pathways mediate the dDAVP-induced AS160 phosphorylation, and AS160 knockdown is associated with higher AQP2 expression in the plasma membrane. Since AS160 contains a GAP domain leading to a decrease in the active GTP-bound form of AS160 target Rab proteins for vesicle trafficking, decreased expression of AS160 is likely to play a role in the translocation of AQP2 to the plasma membrane." @default.
- W2018071317 created "2016-06-24" @default.
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- W2018071317 date "2011-07-01" @default.
- W2018071317 modified "2023-09-23" @default.
- W2018071317 title "Emerging role of Akt substrate protein AS160 in the regulation of AQP2 translocation" @default.
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- W2018071317 doi "https://doi.org/10.1152/ajprenal.00519.2010" @default.
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