Abstract
Electron transport across biological membranes is a well-known feature of bacteria, mitochondria and chloroplasts, where it provides motive forces for vectorial transport processes1. In contrast, electron transport is generally not found in the plasma membrane of eukaryotic cells, possibly because it would interfere with electric processes at the plasma membrane. An exception is provided by the phagocyte NADPH oxidase, which generates superoxide (
) through electron transfer from cytosolic NADPH to extracellular oxygen2,3,4,5. The enzyme is essential for host defence, and patients with chronic granulomatous disease, who lack the functional enzyme, suffer from severe infections6,7. It has been suggested that electron transfer by the NADPH oxidase might be electrogenic8. Here we demonstrate, using the whole-cell patch-clamp technique, the generation of electron currents by the NADPH oxidase in human eosinophil granulocytes. The currents were absent in granulocytes of sufferers of chronic granulomatous disease and under conditions of low oxygen. Generation of electron currents across the plasma membrane of eukaryotic cells has not been observed previously and might be — independently of the generation of superoxide — a physiologically relevant function of the phagocyte NADPH oxidase.
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Acknowledgements
We thank E. Huggler for technical assistance; L. Bernheim, S. Rawlings, and M. Rossier for discussions; W. Zimmerli, R. Seger and P. Beris for help with the patients; and N. Mensi for the G6PD determination. This work was supported by grants from the Swiss National Foundation (to J.S., K.-H.K., N.D., B.B.), the Janggen Poehn Foundation (J.S.), the Max Cloetta Foundation (N.D.), FEBS (B.B.), and the Swedish Medical Research Grant (L.S.).
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Schrenzel, J., Serrander, L., Bánfi, B. et al. Electron currents generated by the human phagocyte NADPH oxidase. Nature 392, 734–737 (1998). https://doi.org/10.1038/33725
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DOI: https://doi.org/10.1038/33725
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