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Iridoid glycosides (CIG) are the major component of Corni fructus . In this work, we researched the antioxidative, hypoglycemic and lowering blood lipids effects of CIG on diabetic mice induced by a high-fat diet (HFD) and streptozotocin (STZ). Furthermore, to investigate the molecular mechanism of action, the phosphorylation and protein expression of phosphoinositide 3-kinase (PI3K) and its downstream proteins, such as insulin receptor (INSR), protein kinase B (Akt/PKB) and glucose transporter 4 (GLUT4) have been detected. The results showed that CIG significantly improved oral glucose tolerance in diabetic mice. Biochemical indices also revealed that CIG had a positive effect on lipid metabolism and oxidative stress. In addition, CIG can significantly enhance the expression level of the PI3K-Akt/PKB pathway related proteins in skeletal muscle, which is the key pathway of insulin metabolism. These findings show that CIG can improve the hyperglycemia and hyperlipidemia of HFD-STZ-induced diabetic mice through the PI3K-Akt/PKB signaling pathway, and CIG might be a potential medicine or functional food for type 2 diabetes mellitus remedies.

rsc advances

Hypoglycemic, hypolipidemic and antioxidant effects of iridoid glycosides extracted from <i>Corni fructus</i>: possible involvement of the PI3K–Akt/PKB signaling pathway

Hypoglycemic, hypolipidemic and antioxidant effects of iridoid glycosides extracted from Corni fructus: possible involvement of the PI3K–Akt/PKB signaling pathway