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Research Communication

L-Arabinose Feeding Prevents Increases Due to Dietary Sucrose in Lipogenic Enzymes and Triacylglycerol Levels in Rats¹

Shigemitsu Osaki, Tomoe Kimura^*, Tomomi Sugimoto^*, Susumu Hizukuri^** and Nobuko Iritani^*2

^* Faculty of Human and Cultural Studies, Tezukayama Gakuin University Sakai, Osaka 590-0113, Japan; Sanwa Cornstarch Co. Ltd., Kashiwara, Nara 634-0834, Japan and ^** Faculty of Home Economics, Kobe Women’s University, Higashisuma, Kobe 654-8585, Japan

²To whom correspondence should be addressed. E-mail: iritani{at}hcs.tezuka-gu.ac.jp

L-Arabinose is a natural, poorly absorbed pentose that selectively inhibits intestinal sucrase activity. To investigate the effects of L-arabinose feeding on lipogenesis due to its inhibition of sucrase, rats were fed 0–30 g sucrose/100 g diets containing 0–1 g L-arabinose/100 g for 10 d. Lipogenic enzyme activities and triacylglycerol concentrations in the liver were significantly increased by dietary sucrose, and arabinose significantly prevented these increases. Arabinose feeding reduced the weights of epididymal adipose tissue. Moreover, plasma insulin and triacylglycerol concentrations were significantly reduced by dietary L-arabinose. These findings suggest that L-arabinose inhibits intestinal sucrase activity, thereby reducing sucrose utilization, and consequently decreasing lipogenesis.

KEY WORDS: • L-arabinose • sucrose • lipogenic enzymes • triacylglycerol levels • rats