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Chronic and acute ethanol treatment modifies fluidity and composition in plasma membranes of a human hepaic cell line (WRL-68)

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Abstract

The aim of this study was to compare the effects of chronic (0.1 mol/L ethanol exposure during 30 days) and acute (0.5 mol/L ethanol exposure during 24 h) ethanol treatment on the physical properties and the lipid composition of plasma membranes of the WRL-68 cells (fetal human hepatic cell line). Using fluorescence polarization we found that ethanol treatment reduced membrane anisotropy due to disorganization of acyl chains in plasma membranes and consequently increased fluidity, as measured with the diphenylhexatriene probe. Addition of ethanolin vitro reduced anisotropy in control plasma membranes, whereas chronically ethanol-treated plasma membranes were relatively tolerant to thein vitro addition of ethanol. Acutely ethanol-treated plasma membranes exhibited a smaller anisotropy parameter value than control plasma membranes. We found a decrease in total phospholipid content in acute ethanol WRL-68 plasma membranes. Cholesterol content was increased in both ethanol treatments, and we also found a significant decrease in phosphatidylinositol and phosphatidylcholine and an increase in phosphatidylethanolamine content in ethanol-treated plasma membranes. Our data showed that ethanol treatment decreased the anisotropy parameter consistently with increased fluidity, while increasing the cholesterol/phospholipid ratio of plasma membranes of WRL-68 cells, but only chronically ethanol-treated plasma membranes exhibited tolerance to thein vitro addition of ethanol. It is important to note that some changes that were interpreted as a result of chronic ethanol treatment were also present in short-period ethanol treatments.

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Abbreviations

DPH:

diphenylhexatriene

PC:

phosphatidylcholine

PE:

phosphatidylethanolamine

PI:

phosphatidylinositol

PS:

phosphatidylserine

SPH:

sphingomyelin

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Authors and Affiliations

  1. Laboratorio de Fisiología Celular, Departmento de Ciencias de la Salud, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Apdo. Postal 55-535, 09340, México, D.F., Mexico

    M. C. Gutiérrez-Ruiz, J. L. Gómez, V. Souza & L. Bucio

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  1. M. C. Gutiérrez-Ruiz
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  2. J. L. Gómez
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  3. V. Souza
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  4. L. Bucio
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Gutiérrez-Ruiz, M.C., Gómez, J.L., Souza, V. et al. Chronic and acute ethanol treatment modifies fluidity and composition in plasma membranes of a human hepaic cell line (WRL-68). Cell Biol Toxicol 11, 69–78 (1995). https://doi.org/10.1007/BF00767492

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  • DOI: https://doi.org/10.1007/BF00767492

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