Effect of Oleanic Acid on Key Enzyme Activity in Insulin-Resistant HepG2 Cell Line / 医药导报

ABSTRACT

Objective To explore the effect of oleanic acid on key enzyme activity in insulin-resistant HepG2 cells. Methods The HepG2 cells were divided into normal control,model control,metformin,and oleanic acid groups.Glycogen content in insulin-resistant HepG2 cell model were detected by hepatic glycogen test kit upon treatment with oleanic acid.Activities of glucokinase ( GK) ,phosphoenolpyruvate carboxylase kinase (PEPCK),and glucose-6-phosphatase (G-6-Pase) were assayed by the glucose 6-phosphate dehydrogenase coupling colorimetric, lactate dehydrogenase coupling colorimetric and ammonium molybdate constant phosphorus methods. Results The oleanic acid enhanced glucose consumption,lowered the activity of G-6-Pase and PEPCK by 54.8% and 18.8%,respectively,and increased the activity of GK and glycogen content in also insulin-resistant HepG2 cells by 100.6% and 98.6%,respectively. Conclusion Aqueous extracts of shirako play a role in lowering PEPCK and G-6-Pase activities and inhibiting glucogenesis, resulting in the reduction of endogenous glucose in the cell. In addition,it can augment the activity of GK,accelerate the process of glucolysis,increase the glycogen content,and alleviate insulin resistance of HepG2.