Quercetin ameliorates hyperglycemia and dyslipidemia and improves antioxidant status in type 2 diabetic db/db mice

  • Jeong, Soo-Mi (Department of Smart Foods and Drugs, School of Food and Life Science, Inje University) ;
  • Kang, Min-Jung (Department of Smart Foods and Drugs, School of Food and Life Science, Inje University) ;
  • Choi, Ha-Neul (Department of Smart Foods and Drugs, School of Food and Life Science, Inje University) ;
  • Kim, Ji-Hye (Department of Smart Foods and Drugs, School of Food and Life Science, Inje University) ;
  • Kim, Jung-In (Department of Smart Foods and Drugs, School of Food and Life Science, Inje University)
  • Received : 2012.01.26
  • Accepted : 2012.03.16
  • Published : 2012.06.30


This study investigated the hypoglycemic, hypolipidemic, and antioxidant effects of dietary quercetin in an animal model of type 2 diabetes mellitus. Four-week-old C57BL/KsJ-db/db mice (n = 18) were offered an AIN-93G diet or a diet containing quercetin at 0.04% (low quercetin, LQE) or 0.08% of the diet (high quercetin, HQE) for 6 weeks after 1 week of adaptation. Plasma glucose, insulin, adiponectin, and lipid profiles, and lipid peroxidation of the liver were determined. Plasma glucose levels were significantly lower in the LQE group than in the control group, and those in the HQE group were even further reduced compared with the LQE group. The homeostasis model assessment for insulin resistance (HOMA-IR) showed lower values for LQE and HQE than for the control group without significant influence on insulin levels. High quercetin increased plasma adiponectin compared with the control group. Plasma triglycerides in the LQE and HQE groups were lower than those in the control group. Supplementation with high quercetin decreased plasma total cholesterol and increased HDL-cholesterol compared with the control group. Consumption of low and high quercetin reduced thiobarbituric acid reactive substances (TBARS) levels and elevated activities of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px) in the liver. Thus, quercetin could be effective in improving hyperglycemia, dyslipidemia, and antioxidant status in type 2 diabetes.


Supported by : National Research Foundation of Korea (NRF)


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