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Species differences in the physiological activity of dietary lignan (sesamin and episesamin) in affecting hepatic fatty acid metabolism

Published online by Cambridge University Press:  09 March 2007

Masayo Kushiro ,
Yoko Takahashi  and
Takashi Ide
Masayo Kushiro*
Affiliation:
Laboratory of Nutritional Biochemistry, National Food Research Institute, 2-1-12 Kannondai, Tsukuba 305-8642, Japan
Yoko Takahashi
Affiliation:
Laboratory of Nutritional Biochemistry, National Food Research Institute, 2-1-12 Kannondai, Tsukuba 305-8642, Japan
Takashi Ide
Affiliation:
Laboratory of Nutritional Biochemistry, National Food Research Institute, 2-1-12 Kannondai, Tsukuba 305-8642, Japan
*
*Corresponding author: Dr Masayo Kushiro, fax +81 29 838 7996, email [email protected]
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Abstract

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The effect of sesame (Sesamum orientale) lignan preparation containing equivalent amounts of sesamin and episesamin on hepatic fatty acid metabolism was compared in rats, mice and hamsters. Animals were fed on either a diet free of lignan or a diet containing 2glignan/kg for 15d. The lignan preparation greatly increased hepatic activity and the mRNA levels of enzymes involved in fatty acid oxidation, while it strongly down-regulated those of enzymes involved in lipogenesis in rats. In contrast, lignan did not modify these variables in mice and hamsters. Changes observed, if any, were more attenuated in these mice and hamsters than in rats. Sesamin and episesamin concentrations in serum and liver of animals fed on lignan-containing diets were significantly greater (P<0·05) in rats than in mice and hamsters. Moreover, sesamin:episesamin values in tissues were far from that expected from the value in the lignan preparation given to the animals and were dependent on the animal species. Liver microsomes from each animal species degraded sesamin and episesamin in the presence of NADPH. The combined value of sesamin and episesamin degradation rates was lower in rats than in mice and hamsters. In addition, there was considerable diversity in the specificity of the enzyme reaction toward sesamin and episesamin among animal species. The differences in the amounts of lignan remaining in the tissues may account for the species dependence of the physiological activity of sesame lignan in affecting hepatic fatty acid oxidation and synthesis.

Keywords

Sesame lignanFatty acid metabolismAnimal species
Type
Research Article
Information
British Journal of Nutrition , Volume 91 , Issue 3 , March 2004 , pp. 377 - 386
Copyright
Copyright © The Nutrition Society 2004

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