The Journal of General Physiology
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The Journal of General Physiology, Vol 83, 47-56, Copyright © 1984 by The Rockefeller University Press

ARTICLES

Theoretical effects of transmembrane electroneutral exchange on membrane potential

R Jacob, D Piwnica-Worms, CR Horres and M Lieberman

Transmembrane electroneutral transport mechanisms [e.g., Na/H exchange, Cl/HCO3 exchange, (K + Cl) cotransport] have recently been identified in a wide variety of cell types. If these exchanges sum to give a net electroneutral Na/K exchange, they may hyperpolarize the membrane potential beyond the value calculated from the Mullins-Noda equation, provided the cell maintains steady state intracellular ionic concentrations. In extreme circumstances, the membrane potential could hyperpolarize beyond the potassium reversal potential. This effect is mediated by the electrogenic Na/K pump. If either Na or K exchanges electroneutrally against a third ion (e.g., Na/Ca exchange), then the exchange may depolarize the membrane potential.
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