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Metformin reduces body weight gain and improves glucose intolerance in high-fat diet-fed C57BL/6J mice.

In an acute treatment experiment, metformin (150, 300 mg/kg, per os (p.o.)) markedly reduced the consumption of a high-fat diet (HFD) (45 kcal% fat-containing diet) for 2 h after the HFD was given to the fasted male C57BL/6J (B6) mice. In addition, metformin at a higher dose increased plasma active glucagon-like peptide-1 (GLP-1) levels at 1 h after the HFD was given. On the other hand, pioglitazone (12 mg/kg, p.o.) slightly increased the food intake but did not affect active GLP-1 levels when given at 6 and 12 mg/kg, p.o. In a long-team experiment for 9 weeks, metformin treatment (0.25, 0.5% in the HFD) resulted in reduction of body weight gain and HFD intake. When wet weights of various body fat pads of each mouse were measured at 9 weeks after treatment, metformin markedly decreased these weights. However, pioglitazone treatment (0.01, 0.02% in the HFD) did not have obvious effects on these parameters. Oral glucose tolerance test was carried out after 20-h fasting at 4 weeks post-treatment. Whereas metformin treatment (0.25, 0.5%) markedly improved glucose intolerance, pioglitazone treatment (0.02%) slightly improved this parameter. At 9 weeks, both metformin and pioglitazone markedly improved hyperglycemia and hyperinsulinemia. Metformin treatment also improved hyperleptinemia, whereas pioglitazone was ineffective. These results indicate that metformin reduces body weight gain and improves glucose intolerance in HFD-induced obese diabetic B6 mice.

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