Apigenin and naringenin regulate glucose and lipid metabolism, and ameliorate vascular dysfunction in type 2 diabetic rats

European Journal of Pharmacology
Bei RenJingyu Liang

Abstract

Vascular endothelial dysfunction is regarded as the initial step of vascular complications in diabetes mellitus. This study investigated the amelioration of apigenin and naringenin in type 2 diabetic (T2D) rats induced by high-fat diet and streptozotocin and explored the underlying mechanism. Apigenin or naringenin was intragastrically administered at 50 or 100mg/kg once a day for 6 weeks. Biochemical parameters including blood glucose, glycated serum protein, serum lipid, insulin, superoxide dismutase (SOD), malonaldehyde and intercellular adhesion molecule-1 (ICAM-1) were measured. Vascular reactivity in isolated thoracic aortic rings was examined. Pathological features of the thoracic aorta were further observed through optical microscopy and transmission electron microscopy. Lastly, we evaluated their effects on insulin resistance of palmitic acid (PA)-induced endothelial cells. Compared with diabetic control group, apigenin and naringenin significantly decreased the levels of blood glucose, serum lipid, malonaldehyde, ICAM-1 and insulin resistance index, increased SOD activity and improved impaired glucose tolerance. Apigenin and naringenin restored phenylephrine-mediated contractions and acetylcholine or insulin-induced r...Continue Reading

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