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The effect of ethanol and calcium on fluid state of plasma membranes of rat hepatocytes

Mills, P. R. and Meier, P. J. and Boyer, J. L. and Gordon, E. R.. (1985) The effect of ethanol and calcium on fluid state of plasma membranes of rat hepatocytes. Alcohol (Fayetteville, N.Y.), Vol. 2, H. 1. S. 153-156.

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Official URL: http://edoc.unibas.ch/dok/A5261807

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Abstract

Basolateral (blLPM) and canalicular (cLPM) plasma membrane vesicles were isolated from rat liver to compare membrane fluidity, fluidity responses to membrane perturbants, and the relationship between fluidity and a membrane protein function such as carrier-mediated taurocholate transport. Membrane fluidity was measured by fluorescence polarization using 1,6-diphenyl-1,3,5-hexatriene as a probe. Uptake of [3H] taurocholate was measured by a rapid Millipore filtration technique. blLPM were more fluid than cLPM. Ethanol produced a concentration-dependent fluidizing effect on both membrane preparations, the change being greater in blLPM. Incubation with calcium for 2 hr at 37 degrees C rendered both membrane preparations more rigid, again the cLPM being more resistant to perturbation. There was a linear correlation between an increase in membrane fluidity and inhibition of taurocholate uptake into blLPM in the presence of increasing concentrations of ethanol. The data support the concept that membrane lipid fluidity is an important regulator of membrane protein functions and hence also of overall cellular activity.
Faculties and Departments:11 Rektorat und Verwaltung > Vizerektorat Forschung
UniBasel Contributors:Meier-Abt, Peter J.
Item Type:Article, refereed
Bibsysno:Link to catalogue
Publisher:Elsevier Science
ISSN:0741-8329
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:24
Deposited On:22 Mar 2012 13:40

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