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The aim of this study is to investigate the effect of Lespedeza maximowiczii var. tricolor Nakai (LMTN) on glucose metabolism. LMTN extract significantly enhanced the glucose uptake and lipid accumulation in 3T3-L1 adipocytes compared with control. Also, LMTN extract in 3T3-L1 adipocytes significantly increased the protein expression of peroxisome proliferatoractivated receptor (PPAR)γ, insulin receptor substrate-1, and glucose transporter (GLUT)4. The regulatory effect on glucose uptake or insulin signal transduction of LMTM extract was lower than troglitazone or pinitol such as the positive control, but increased PPARγ activation. Additionally, LMTM extract has an insulin-mimetic effect. In db/db mice, LMTN extract (250 mg/kg BW) significantly reduced water and food intake, blood glucose, and level of plasma triglyceride and total cholesterol. Furthermore, the expression of PPARã and GLUT4 mRNA in adipose or muscle tissue effectively was increased by oral treatment of LMTN extract. Thus, our results suggest that LMTN extract improves the glucose metabolism through PPARγ and insulinmimetic effect in 3T3-L1 adipocytes and db/db mice.

journal of applied biological chemistry

Methanol extract ofLespedeza maximowicziivar.tricolorNakai improves glucose metabolism through PPARγ agonist and insulin-mimetic effect in 3T3-L1 adipocytes anddb/dbmice