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. 2011 Oct 15;22(20):3812–3825. doi: 10.1091/mbc.E11-04-0328

FIGURE 7:

FIGURE 7:

Acute regulation of NHE3 by SGK3 is dependent on the endosomal localization of SGK3. (A) PS120/NHE3V cells were expressed with HA-SGK3 or HA-SGK3-R90A, and the expression levels of SGK3 and SGK3-R90A in PS120/NHE3V cells were examined with anti-HA antibody. (B) Cellular distribution of SGK3 (green) or SGK3-R90A (green) with NHE3 (red) in PS120 cells was examined with anti-HA and anti-VSVG antibodies, respectively. Scale bar: 10 μm. (C) PS120/NHE3V/HA-SGK3-R90A cells were treated with Dex for t = 0, 15 min, 4 h, or 24 h, and SGK3-R90A protein was purified by immunoprecipitation for kinase assay. The kinase activities of SGK3-R90A are shown relative to the basal activity. n = 3. (D) PS120/NHE3V/HA-SGK3-R90A cells were treated with 1 μM Dex for t = 0, 15 min, or 4 h, followed by measurement of NHE3 activity. The rates of pH recovery at pHi 6.7 are shown. n = 6. *, p < 0.01 and **, p < 0.05, compared with the untreated control.