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Enhanced (Na+K)-ATPase Activity and Expression in Mouse Brain after Chronic Ethanol Administration

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Abstract

It is the general hypothesis that the primary mode of action of ethanol is the alteration of membrane structure and function including the conformation of receptors and ion channels essential for neurotransmission and signal transduction. However, the issue of whether ethanol affects (Na+K)-ATPase under physiological conditions remains unsettled. In this study, adult mice were treated with a daily dose of 5 g/kg of ethanol for 28 days. The RNA was isolated from brain and the (Na+K)-ATPase mRNA level was determined using Northern blot analysis. We have found an increased expression of (Na+K)-ATPase α-subunit in the chronically treated alcohol group as compared with that of controls. This result was further substantiated by increased protein phosphorylation as well as increased specific activity of this enzyme in the synaptosomal plasma membrane after chronic ethanol administration. Thus we have demonstrated that ethanol may directly affect (Na+K)-ATPase in vivo, leading to the increased synthesis of this enzyme through adaptive mechanisms.

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  1. Department of Pharmacology, University of Missouri, Columbia, MO, 65212

    Yongmei Chen, Patricia M. Wixom & Albert Y. Sun

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Chen, Y., Wixom, P.M. & Sun, A.Y. Enhanced (Na+K)-ATPase Activity and Expression in Mouse Brain after Chronic Ethanol Administration. Neurochem Res 22, 583–588 (1997). https://doi.org/10.1023/A:1022470019604

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