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The dipeptide Tyr-Pro, a novel natural agonist of adiponectin receptor 1 (AdipoR1), promotes glucose uptake in skeletal muscle cells. This study investigated the antidiabetic effect of orally administ...ered Tyr-Pro in spontaneously diabetic Torii (SDT) rats. Oral administration of Tyr-Pro (1 mg/kg/day) improved glucose intolerance in SDT rats at 22 weeks of prediabetic age. By 29 weeks of age, fasting blood glucose levels (BGLs) increased to 142 ± 14 mg/dL in the control group, whereas those in the Tyr-Pro group remained within the normal range (80–99 mg/dL), demonstrating a novel antidiabetic effect in vivo. Substantially increased levels of AdipoR1 and p-AMPK/AMPK were observed in the skeletal muscle of Tyr-Pro-administrated SDT rats. The intake of Tyr-Pro also enhanced insulin secretion and inhibited p-IRS-1(Ser) in skeletal muscle. These findings demonstrate that Tyr-Pro prevented the onset of diabetes and improved impaired insulin signaling pathways in SDT rats by inducing AdipoR1-mediated AMPK activation.続きを見る
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