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http://dx.doi.org/10.5352/JLS.2002.12.6.769

Effect of trans Fatty acid containing Fats on Cholesterol Metabolism and Hepatic Membrane Fluidity in Rats  

김찬희 (인제대학교 식품생명과학부 및 식품과학연구소)
원미숙 (기초과학연구소 부산분소)
송영선 (인제대학교 식품생명과학부 및 식품과학연구소)
Publication Information
Journal of Life Science / v.12, no.6, 2002 , pp. 769-779 More about this Journal
Abstract
Although negative evidences of trans fatty acids(tFAs) are gradually increasing, the hypercholesterolemic effect of tFAs are controversial and its biological significances are still not known. The objective of this study was to examine the effect of dietary tFAs on cholesterol metabolism and membrane fluidity in rats. Animals were fed diets containing 0.5% cholesterol and 20% test fats(margarine, butter, corn oil) for 8 weeks. Each test fats(margarine, butter, corn oil) contained 25%, 8.5% and no tFAs, respectively, Plasma total triglyceride(TG) were not different among diet treatments. Feeding trans fat diets (margarine and butter) lowered plasma cholesterol. Specially, butter diet elevated LDL-cholesterol and decreased HDL-cholesterol levels, resulting in the highest atherogenic index among diet treatments. Hepatic cholesterol concentration and HMG CoA reductase activity were also decreased, whereas fecal excretion of cholesterol was increased in trans fat-fed animals. trans fat containing diets also decreased hepatic membrane fluidity. From these results, it can be concluded that hypercholesterolemic effect of tFAs can be modulated by the fatty acid composition of diets, but its spatial cofiguration may help behave like saturated fatty acid in membrane fluidity.
Keywords
trans fatty acids; margarine; butter; cholesterol; membrane fluidity;
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