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Dietary fish oil reduces cholesterol and arachidonic acid levels in chick plasma and very low density lipoprotein

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Abstract

The mechanisms involved in the hypolipidemic effects of fish oil have not been clearly established. This study shows that supplementation of 10% menhaden oil to the chick diet for 7 days produced a significant hypocholesterolemia and hypotriglyceridemia. Fatty acid composition of chick plasma drastically changed by the same dietary manipulation. Percentages of 20:5 and 22:6 n-3 fatty acids strongly increased, while percentages of 20:4 n-6, 18:2 n-6, and 18:1 n-9 significantly decreased. Changes observed in the relative percentages were parallel to those obtained in the amount of each fatty acid. Ratio of n-3/n-6 clearly decreased in plasma by fish oil feeding. Total cholesterol and triacylglycerol contents decreased in high density lipoprotein (HDL) but did not change in low density lipoprotein (LDL). All chemical constituents of very low density lipoprotein (VLDL) significantly decreased after the first week of menhaden oil supplementation to the diet. Similar modifications in fatty acid composition of the three lipoprotein fractions were also found. Our results suggest that the hypocholesterolemic effects of fish oil may be mediated by the depletion in VLDL synthesis and secretion into the chick plasma. On the other hand, the strong decrease found in the arachidonic acid (AA) content of chick plasma and lipoproteins may contribute to the beneficial effects of fish oil consumption by lowering the production of its derived eicosanoids.

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Authors and Affiliations

  1. Department of Biochemistry and Molecular Biology, Faculty of Sciences, University of Granada, Granada, Spain

    Mercedes Castillo, Fatima Amalik, Ana Linares & Eduardo Garciacute;a-Peregrín

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  1. Mercedes Castillo
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Castillo, M., Amalik, F., Linares, A. et al. Dietary fish oil reduces cholesterol and arachidonic acid levels in chick plasma and very low density lipoprotein. Mol Cell Biochem 200, 59–67 (1999). https://doi.org/10.1023/A:1006952527258

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