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• W2187178004 endingPage "C1229" @default.
• W2187178004 startingPage "C1218" @default.
• W2187178004 abstract "To examine the effect of hyperosmolality on Na(+)/H(+) exchanger (NHE) activity in mesangial cells (MCs), we used a pH-sensitive dye, 2',7'-bis(2-carboxyethyl)-5(6)-carboxyfluorescein-AM, to measure intracellular pH (pH(i)) in a single MC from rat glomeruli. All the experiments were performed in CO(2)/HCO(-)(3)-free HEPES solutions. Exposure of MCs to hyperosmotic HEPES solutions (500 mosmol/kgH(2)O) treated with mannitol caused cell alkalinization. The hyperosmolality-induced cell alkalinization was inhibited by 100 microM ethylisopropylamiloride, a specific NHE inhibitor, and was dependent on extracellular Na(+). The hyperosmolality shifted the Na(+)-dependent acid extrusion rate vs. pH(i) by 0.15-0.3 pH units in the alkaline direction. Removal of extracellular Cl(-) by replacement with gluconate completely abolished the rate of cell alkalinization induced by hyperosmolality and inhibited the Na(+)-dependent acid extrusion rate, whereas, under isosmotic conditions, it caused no effect on Na(+)-dependent pH(i) recovery rate or Na(+)-dependent acid extrusion rate. The Cl(-)-dependent cell alkalinization rate under hyperosmotic conditions was partially inhibited by pretreatment with 5-nitro-2-(3-phenylpropylamino)benzoic acid, DIDS, and colchicine. We conclude: 1) in MCs, hyperosmolality activates NHE to cause cell alkalinization, 2) the acid extrusion rate via NHE is greater under hyperosmotic conditions than under isosmotic conditions at a wide range of pH(i), 3) the NHE activation under hyperosmotic conditions, but not under isosmotic conditions, requires extracellular Cl(-), and 4) the Cl(-)-dependent NHE activation under hyperosmotic conditions partly occurs via Cl(-) channel and microtubule-dependent processes." @default.
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• W2187178004 date "2000-06-01" @default.
• W2187178004 modified "2023-10-14" @default.
• W2187178004 title "Extracellular Cl⁻modulates shrinkage-induced activation of Na⁺/H⁺exchanger in rat mesangial cells" @default.
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• W2187178004 doi "https://doi.org/10.1152/ajpcell.2000.278.6.c1218" @default.
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