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- W1532880215 abstract "The ion-transport properties of the basal lateral membranes of intact isolated parietal cells were studied at the cellular and subcellular level. The presence of an amiloride-sensitive Na+:H+ exchange was demonstrated in cells by proton gradient-driven Na+ uptake and by changes in cell pH as monitored by dimethylcarboxylfluorescein fluorescence both in a fluorimeter and on single isolated cells using a fluorescence microscope and an attached intensified photodiode array spectrophotometer. The presence of the Na+:H+ antiport in vesicles was shown both by intravesicular acidification monitored by acridine orange fluorescent quenching and by proton gradient-dependent Na+ uptake. The presence of Cl-:HCO-3 exchange was determined in intact cells by monitoring changes in cell pH due to Cl- uptake and was shown to be 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid- and 4-acetamido-4'-isothiocyanostilbene-2,2'-disulfonic acid-sensitive. In vesicles, Cl-:HCO-3 exchange was demonstrated by Cl- flux measurement. The apparent affinities for both Cl- and HCO-3 on either side of the membrane were determined to be Km Cli = 20 mM, Km Clout = 17.5 mM, Km HCO-3in = 2.5 mM, and Km HCO-3out = 7.5 mM. A K+ conductance in cells and vesicles was demonstrated by monitoring K+ gradient-dependent 86Rb uptake. No evidence was found for the presence of a Cl- conductance in either cells or vesicles but a H+ conductance was found to be present in vesicles but not in intact cells. In the latter, by determining the effect of either Na+ or Cl- gradients on cell pH and by flux calculations it was concluded that the Cl-:HCO-3 exchange was the major passive flux mechanism for pH regulation in this cell type." @default.
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- W1532880215 date "1985-06-01" @default.
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- W1532880215 title "Electrolyte transport across the basolateral membrane of the parietal cells." @default.
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- W1532880215 doi "https://doi.org/10.1016/s0021-9258(18)88829-9" @default.
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