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Am J Physiol Renal Physiol 253: F1040-F1050, 1987;
0363-6127/87 $5.00
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AJP - Renal Physiology, Vol 253, Issue 5 1040-F1050, Copyright © 1987 by American Physiological Society

ARTICLES

Transport of tetraethylammonium by rabbit renal brush-border and basolateral membrane vesicles

S. H. Wright and T. M. Wunz
Department of Physiology, College of Medicine, University of Arizona, Tucson 85724.

Brush-border and basolateral membrane vesicles (BBMV and BLMV, respectively) from rabbit renal cortex were used to study transport of the organic cation, tetraethylammonium (TEA). Outwardly directed proton gradients stimulated uptake of TEA into BBMV and supported concentrative accumulation. Furthermore, an inwardly directed H+ gradient accelerated TEA efflux from BBMV. These data suggest that TEA transport in BBMV involved exchange with H+. The Jmax and Kt for TEA transport into BBMV under pH equilibrium conditions (pH 7.5) were 2.1 nmol.mg-1.min-1 and 0.15 mM, respectively. Under pH gradient conditions (6.0in:7.5out), Jmax increased by 270% with no effect on Kt. Uptake of TEA into BBMV was stimulated by an inside-positive electrical potential difference (PD), although exchange of TEA for H+ appeared to be one for one. In BLMV, H+ gradients had little effect on TEA uptake and were incapable of supporting concentrative transport. The Jmax and Kt for TEA transport in BLMV were 0.33 nmol.mg-1.min-1 and 0.37 mM, respectively. Inside-negative PDs stimulated this uptake, suggesting that it involved an electrically conductive pathway. TEA transport in BBMV and BLMV was inhibited by amiloride and cimetidine, although p-aminohippuric acid was without effect. Thus, secretion of TEA involves carrier-mediated transport steps at both the luminal and peritubular membranes, although an active step is not evident in isolated BLMV.


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