Rapid induction of P/C-type inactivation is the mechanism for acid-induced K+ current inhibition

Extracellular acidification is known to decrease the conductance of many voltage-gated potassium channels. In the present study, we investigated the mechanism of H-o(+)-induccd current inhibition by taking advantage of Na+ permeation through inactivated channels. In hKv1.5, H-o(+) inhibited open-state Na+ current with a similar potency to K+ current, but had little effect on the amplitude of,inactivated-state Na+ current. In support of inactivation as the mechanism for the current reduction, Na+ current through noninactivating hKv1.5-R487V channels was not affected by [H-o(+)]. At pH 6.4, channels were maximally inactivated as soon as sufficient time was given to allow activation, which suggested two possibilities for the mechanism of action of H-o(+). These were that inactivation of channels in early closed states occurred while hyperpolarized during exposure to acid pH (closed-state inactivation) and/or inactivation from the open state was greatly accelerated at low pH. The absence of outward Na+ currents but the maintained presence of slow Na+ tail currents, combined with changes in the Na+ tail current time course at pH 6.4, led us to favor the hypothesis that a reduction in the activation energy for the inactivation transition from the open state underlies the inhibition of hKv1.5 Na+ current at low pH.