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The FASEB Journal, Vol 6, 2434-2438, Copyright © 1992 by The Federation of American Societies for Experimental Biology

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Na,K-ATPase function in alternating electric fields

M Blank
Department of Physiology and Cellular Biophysics, Columbia University College of Physicians & Surgeons, New York, New York 10032.

Alternating currents affect ion transport processes and ATP splitting through changes in the activation of the membrane Na,K-ATPase. Both processes vary with the frequency, and the effective range includes the environmental 60 Hz. ATP splitting by Na,K-ATPase suspensions decreases for the enzyme under normal conditions, with the maximum effect at 100 Hz. ATP splitting increases when the enzyme activity is lowered to less than half its optimal value by changes in temperature, ouabain concentration, etc. These observations can be explained by the effects of the ionic currents on ion binding at the enzyme activation sites. Such a mechanism could account for the effects of electromagnetic fields on cells, as the transmembrane enzyme can convey the effect of an extracellular signal into the cell via ionic fluxes, and the measured threshold field is within the range of reported biological effects.


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A. Lacy-hulbert, J. C. Metcalfe, and R. Hesketh
Biological responses to electromagnetic fields
FASEB J, April 1, 1998; 12(6): 395 - 420.
[Abstract] [Full Text]


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Copyright © 1992 by The Federation of American Societies for Experimental Biology.