title: Hypoglycemic effect of resveratrol in type 2 diabetic model db/db mice and its actions in cultured L6 myotubes and RIN-5F pancreatic β-cells.
abstract: Resveratrol, a phytoalexin present in the skin of grapes and red wine, has been demonstrated to possess a wide range of health promoting activities including anti-diabetic properties. In the present study, we investigated the effect of resveratrol in both type 2 diabetic mice and cell culture systems. In cultured L6 myotubes, we studied the effect of resveratrol on glucose uptake and translocation of glucose transporter 4 to plasma membrane from the aspects of insulin signaling and AMP-activated protein kinase signaling. In cultured RIN-5F cells, we examined whether resveratrol would protect the pancreas-derived β-cells from oxidative stress. Resveratrol significantly suppressed the elevation in the fasting blood glucose level and the serum triglyceride and lipid peroxide levels in db/db mice. Resveratrol stimulated glucose uptake and glucose transporter 4 translocation by activating both insulin signaling and AMP-activated protein kinase signaling. Moreover, resveratrol could protect pancreatic β-cells from advanced glycation end products-induced oxidative stress and apoptosis. From these results, resveratrol is suggested to show anti-diabetic effect by stimulating both insulin-dependent and -independent glucose uptake in muscles and by protecting pancreatic β-cells from advanced glycation end products-induced oxidative stress and apoptosis.
authors.affiliation: Department of Applied Biological Chemistry, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Miki
authors.initials: M
authors.lastname: Minakawa
authors.forename: Atutoshi
authors.initials: A
authors.lastname: Kawano
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Miura
authors.forename: Kazumi
authors.initials: K
authors.lastname: Yagasaki