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W2344495961 abstract "This study sought to characterize the mechanism ofNa transport across basolateral membrane vesicles of rat distal colon. Both an outward proton gradient and an inward bicarbonate gradient stimulated 22Na uptake. Proton gradient-stimulated n2Na uptake was activated severalfold by the additional presence of an inward bicarbonate gradient, and bicarbonate gradient-stimulated nNa uptake was significantly enhanced by an imposed intravesicular membrane positive potential. 0.1 mM amiloride inhibited both proton gradient- and bicarbonate gradient-stimulated 22Na uptake by 80 and 95%, respectively, while 1 mM 4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid (DIDS) inhibited both proton gradient- and bicarbonate gradient-stimulatednNa uptakeby40 and80%, respectively. Both proton gradient- and bicarbonate gradient-stimulated 'Na uptake saturated as a function ofincreasingNa concentration: the apparent kinetic constants (K:) for Na for the DIDS-insensitive component of proton gradient-stimulated nNa uptake was 46.4 mM, while the DIDS-sensitive component of proton gradient- and bicarbonate gradient-stimulatednNa uptake hadK. for Na of 8.1 and 6.4 mM, respectively. Amiloride inhibited both DIDS-insensitive proton gradient- and bicarbonate gradient-stimulated 22Na uptake with an inhibitory constant(Kj of -35 and 1 &NI, respectively. We conclude from these results that proton gradient-stimulated 22Na uptake represents both DIDS-insensitive Na-H exchange and DIDS-sensitive electrogenicNa-OH cotransport, and that the DIDS-sensitive component of proton gradient-stimulated nNa uptake and bicarbonate gradient-stimulated 22Na uptake may represent the same" @default.
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W2344495961 date "1991-01-01" @default.
W2344495961 modified "2023-09-27" @default.
W2344495961 title "Evidence for Na-H Exchange and Na-Anion Cotransport" @default.
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