Effects of Xanthohumol-rich Extract from the Hop on Fatty Acid Metabolism in Rats Fed a High-fat Diet

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  • Yui Kazuki
    Department of Agricultural Chemistry, School of Agriculture, Meiji University
  • Kiyofuji Ayane
    Department of Agricultural Chemistry, School of Agriculture, Meiji University
  • Osada Kyoichi
    Department of Agricultural Chemistry, School of Agriculture, Meiji University

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Abstract

Xanthohumol is the major prenylated flavonoid of female inflorescences of the hop plant (Humulus lupulus L.) and is a hydrophobic flavonoid. We examined the effects of dietary xanthohumol-rich hop extract in obese rats that was induced by feeding a high-fat diet. Dietary xanthohumol-rich hop extract significantly lowered the body weight gain of these rats compared to rats fed a high-fat diet without the extract. The increase of body weight, liver weight, and triacylglycerol levels in the plasma and liver of the rats fed a high-fat diet was ameliorated by dietary xanthohumol-rich hop extract. Dietary xanthohumol-rich hop extract tended to reduce hepatic fatty acid synthesis through the reduction of hepatic SREBP1c mRNA expression in the rats fed a high-fat diet. The excreted of triacylglycerol into feces also was promoted by dietary xanthohumol-rich hop extract. Plasma adiponectin levels in the rats fed a high-fat diet also tended to be elevated by dietary xanthohumol-rich hop extract. Thus, xanthohumol-rich hop extract may inhibit the increase of body weight, liver weight, and triacylglycerol in the plasma and liver induced by feeding high-fat diet through the regulation of hepatic fatty acid metabolism and inhibition of intestinal fat absorption. Therefore, xanthohumol-rich hop extract may exert preventive function on the increase of body weight and tissue triacylglycerol levels by overnutrition.

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