Elevation of tissue   α-tocopherol levels by conjugated linoleic acid in C57BL6J mice is not associated with changes in vitamin E absorption or alfa-carboxyethyl hydroxychroman production

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Title:	Elevation of tissue α-tocopherol levels by conjugated linoleic acid in C57BL6J mice is not associated with changes in vitamin E absorption or alfa-carboxyethyl hydroxychroman production
Authors:	Chen, Wan-Hsuan Li, Yi-Jen Wang, Ming-Shyong Kang, Zhi-Chyang Huang, Huei-Ling Shaw, Huey-Mei
Contributors:	保健營養系(所)
Keywords:	Conjugated linoleic acid
Date:	2012-01
Issue Date:	2013-06-26 11:36:58 (UTC+8)
Abstract:	Objective Conjugated linoleic acid (CLA) decreases adipose mass and increases vitamin E levels in the liver and adipose tissue in mice. The aim of the present study was to examine the mechanism by which CLA alters vitamin E levels in tissues and antioxidant activity in mice. Methods C57BL/6J mice were divided into three groups and fed 5% lipid as soybean oil alone (control group), 4% soybean oil supplemented with 1% CLA (CLA group), or 5% lipid with a vitamin E supplement (VE group) for 4 wk. Results The CLA and VE diets resulted in a significant increase in the α-tocopherol concentration in all tissues examined, i.e., the liver, kidney, testis, spleen, heart, lung, and adipose tissue (P < 0.05). Levels of thiobarbituric acid-reactive substances in the kidney, testis, heart, lung, and adipose tissue were lower in the CLA and VE groups than in the control group (P < 0.05). CLA did not alter the absorption rate of vitamin E or α-carboxyethyl hydroxychromans levels in the liver and plasma. The CLA diet induced a significant increase in α-tocopherol transfer protein and mRNA levels in the liver. CLA resulted in a decrease in catalase and glutathione peroxidase activities and peroxisome proliferator α mRNA levels but had no effect on levels of mRNAs for other nuclear transcription factors in the liver. Conclusion The increase in vitamin E status in CLA-fed mice is not due to altered absorption and metabolism of vitamin E but might be related to the induction of α-tocopherol transfer protein expression in the liver. The regulation of the activities of catalase and glutathione peroxidase by CLA is not mediated by vitamin E accumulation in the liver.
Relation:	Nutrition, v.28 n.1, pp.59-66
Appears in Collections:	[Dept. of Health and Nutrition (including master's program)] Periodical Articles

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