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. 1992 Feb 1;281(Pt 3):697–701. doi: 10.1042/bj2810697

Phorbol 12-myristate 13-acetate activates an electrogenic H(+)-conducting pathway in the membrane of neutrophils.

A Kapus 1, K Szászi 1, E Ligeti 1
PMCID: PMC1130747  PMID: 1371386

Abstract

The mode of activation of an H(+)-conducting pathway present in the membrane of neutrophils was investigated. (1) Resting neutrophils released protons through an electrogenic Cd(2+)-inhibitable (K0.5 approximately 20 microM) route when a pH gradient and appropriate charge compensation was provided. (2) The rate of H+ efflux was stimulated over 2.5-fold by 4 beta-phorbol 12-myristate 13-acetate (PMA; K0.5 approximately 0.7 nM) or by 4 beta-phorbol 12,13-dibutyrate (K0.5 approximately 20 nM) even when the NADPH oxidase was blocked by p-chloromercuribenzoate. (3) Staurosporine inhibited the effect of PMA. (4) The H+ egress was not enhanced by 4 alpha-phorbol 12,13-didecanoate. (5) Low concentrations of Cd2+ (less than 40 microM) inhibited the H+ flux without influencing the oxidase. The results raise the possibility that protein kinase C could be involved in the activation of an electrogenic H(+)-conducting pathway in the membrane of neutrophils. The activation of this route by phorbol esters seems to be independent of the stimulation of NADPH oxidase.

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Selected References

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