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- W1510080571 abstract "Traditional models of acid-base transport and intracellular pH (pHi) regulation in the renal proximal tubule have been based on the existence of a Na+/H+ exchanger at the luminal membrane and a simple HCO3- conductance at the basolateral membrane. Our recent work, in which we used pH-sensitive microelectrodes or dyes to monitor pHi in isolated renal tubules perfused in the nominal absence of HCO3-, has demonstrated the existence of a novel mechanism of acid extrusion in amphibian and mammalian proximal tubule cells. The salamander proximal tubule, for example, possesses an electroneutral Na+ monocarboxylate (Na+-X-) co-transporter, but only at the luminal membrane. It also possesses an electroneutral H+-X- co-transporter, but only at the blood side or basolateral membrane. In the presence of lactate, the luminal Na+-lactate co-transporter mediates a net influx of lactate, driven by the Na+ gradient. The cell-to-blood lactate gradient, in turn, drives the coupled efflux of H+ and lactate across the basolateral membrane. The net effect is the reabsorption of lactate, the luminal uptake of Na+ and the basolateral extrusion of H+. Acid extrusion mediated by this monocarboxylate system in the salamander is comparable in magnitude to that mediated by the Na+/H+ exchanger. In the S3 segment of the rabbit proximal tubule, a similar monocarboxylate system (studied with acetate instead of lactate) extrudes acetate at twice the rate of the Na+/H+ exchanger. Thus, monocarboxylate transport, at least in the nominal absence of HCO3-, can have a major impact on pHi regulation." @default.
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- W1510080571 date "2007-09-28" @default.
- W1510080571 modified "2023-09-28" @default.
- W1510080571 title "Role of Monocarboxylate Transport in the Regulation of Intracellular pH of Renal Proximal Tubule Cells" @default.
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- W1510080571 doi "https://doi.org/10.1002/9780470513699.ch6" @default.
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