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Effect of benzyl viologen on the phospholipid fatty acid composition and some properties in hepatic microsomal membrane of rats

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Abstract

The effect of benzyl viologen (a stimulator of free radical production in cells) on lipid composition, fluidity and enzymes involved in both polyunsaturated fatty acid biosynthesis and cholesterol metabolism was studied in liver microsomal membrane of adult rats. In viologen-treated animals, a significant decrease in the levels of free cholesterol and cholesteryl esters, accompanied to a decrease at the free cholesterol/phospholipid ratio, were observed. The levels of 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase and acyl-coenzyme A : cholesterol acyltransferase (ACAT) were also lower in viologen-treated rats than in controls. Linoleic and arachidonic acids were both severely lower while docosatetraenoic, docosapentaenoic and docosahexaenoic acids were significantly higher as compared with controls. Furthermore, a decrease in monounsaturated/saturated ratio was found. In addition, the treatment evoked a depression in the fatty acid desaturation complex, with a diminish of Δ9, Δ9, and Δ5 desaturase activities in microsomal membrane.

It was concluded that changes in phospholipid microsomal fatty acid and cholesterol content could be directly responsible for changes in membrane fluidity and function, and that extensive yield of docosahexaenoic acid may serve to maintain the physical characteristics of particular domains against oxidative stress caused by benzyl viologen treatment.

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Authors and Affiliations

  1. Instituto de la Grasa y sus Derivados (C.S.I.C.), Apartado 1078, 41012, Sevilla, Spain

    F. J. G. Muriana & V. Ruiz-Gutierrez

  2. Departamento de Fisiología y Biologia Animal, Facultad de Farmacia, 41012, Sevilla, Spain

    C. M. Vázquez

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  1. F. J. G. Muriana
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  2. V. Ruiz-Gutierrez
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  3. C. M. Vázquez
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Muriana, F.J.G., Ruiz-Gutierrez, V. & Vázquez, C.M. Effect of benzyl viologen on the phospholipid fatty acid composition and some properties in hepatic microsomal membrane of rats. Mol Cell Biochem 108, 125–131 (1991). https://doi.org/10.1007/BF00233116

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