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- W2170019328 abstract "The anion exchanger pendrin is present in the apical plasma membrane of type B and non-A-non-B intercalated cells of the cortical collecting duct (CCD) and connecting tubule and is involved in HCO(3)(-) secretion. In this study, we investigated whether the abundance and subcellular localization of pendrin are regulated in response to experimental metabolic acidosis and alkalosis with maintained water and sodium intake. NH(4)Cl loading (0.033 mmol NH(4)Cl/g body wt for 7 days) dramatically reduced pendrin abundance to 22 +/- 4% of control values (n = 6, P < 0.005). Immunoperoxidase labeling for pendrin showed reduced intensity in NH(4)Cl-loaded animals compared with control animals. Moreover, double-label laser confocal microscopy revealed a reduction in the fraction of cells in the CCD exhibiting pendrin labeling to 65% of the control value (n = 6, P < 0.005). Conversely, NaHCO(3) loading (0.033 mmol NaHCO(3)/g body wt for 7 days) induced a significant increase in pendrin expression to 153 +/- 11% of control values (n = 6, P < 0.01) with no change in the fraction of cells expressing pendrin. Immunoelectron microscopy revealed no major changes in the subcellular distribution, with abundant labeling in both the apical plasma membrane and the intracellular vesicles in all conditions. These results indicate that changes in pendrin protein expression play a key role in the well-established regulation of HCO(3)(-) secretion in the CCD in response to chronic changes in acid-base balance and suggest that regulation of pendrin expression may be clinically important in the correction of acid-base disturbances." @default.
- W2170019328 created "2016-06-24" @default.
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- W2170019328 date "2003-03-01" @default.
- W2170019328 modified "2023-10-12" @default.
- W2170019328 title "Regulated expression of pendrin in rat kidney in response to chronic NH<sub>4</sub>Cl or NaHCO<sub>3</sub>loading" @default.
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- W2170019328 doi "https://doi.org/10.1152/ajprenal.00254.2002" @default.
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