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• W1991742012 endingPage "592" @default.
• W1991742012 startingPage "579" @default.
• W1991742012 abstract "Abstract The aim of the present study was to investigate whether eicosapentaenoic acid (EPA) or docosahexaenoic acid (DHA) was responsible for the triglyceride‐lowering effect of fish oil. In rats fed a single dose of EPA as ethyl ester (EPA‐EE), the plasma concentration of triglycerides was decreased at 8 h after acute administration. This was accompanied by an increased hepatic fatty acid oxidation and mitochondrial 2,4‐dienoyl‐CoA reductase activity. The steady‐state level of 2,4‐dienoyl‐CoA reductase mRNA increased in parallel with the enzyme activity. An increased hepatic long‐chain acyl‐CoA content, but a reduced amount of hepatic malonyl‐CoA, was obtained at 8 h after acute EPA‐EE treatment. On EPA‐EE supplementation, both EPA (20:5n‐3) and docosapentaenoic acid (DPA, 22:5n‐3) increased in the liver, whereas the hepatic DHA (22:6n‐3) concentration was unchanged. On DHA‐EE supplementation retroconversion to EPA occurred. No statistically significant differences were found, however, for mitochondrial enzyme activities, malonyl‐CoA, long‐chain acyl‐CoA, plasma lipid levels, and the amount of cellular fatty acids between DHA‐EE treated rats and their controls at any time point studied. In cultured rat hepatocytes, the oxidation of [1‐ 14 C]palmitic acid was reduced by DHA, whereas it was stimulated by EPA. In the in vivo studies, the activities of phosphatidate phosphohydrolase and acetyl‐CoA carboxylase were unaffected after acute EPA‐EE and DHA‐EE administration, but the fatty acyl‐CoA oxidase, the rate‐limiting enzyme in peroxisomal fatty acid oxidation, was increased after feeding these n‐3 fatty acids. The hypocholesterolemic properties of EPA‐EE may be due to decreased 3‐hydroxy‐3‐methylglutaryl‐CoA reductase activity. Furthermore, replacement of the ordinary fatty acids, i.e., the monoenes (16:1n‐7, 18:1n‐7, and 18:1n‐9) with EPA and some conversion to DPA concomitant with increased fatty acid oxidation is probably the mechanism leading to changed fatty acid composition. In contrast, DHA does not stimulate fatty acid oxidation and, consequently, no such displacement mechanism operates. In conclusion, we have obtained evidence that EPA, and not DHA, is the fatty acid primarily responsible for the triglyceride‐lowering effect of fish oil in rats." @default.
• W1991742012 created "2016-06-24" @default.
• W1991742012 creator A5024380397 @default.
• W1991742012 creator A5037026123 @default.
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• W1991742012 creator A5081843725 @default.
• W1991742012 date "1996-06-01" @default.
• W1991742012 modified "2023-10-15" @default.
• W1991742012 title "Eicosapentaenoic acid, but not docosahexaenoic acid, increases mitochondrial fatty acid oxidation and upregulates 2,4‐dienoyl‐CoA reductase gene expression in rats" @default.
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