The mechanisms of bisphenolâA (BPA)âinduced metabolic syndrome as well as the protective role of grape seed extract (GSE) and resveratrol were investigated. Rats were treated with BPA (0 and 35 mg·kgâ1·dayâ1, gavage) plus resveratrol (25, 50, and 100 mg·kgâ1·dayâ1, i.p.) or GSE (3, 6, 12 mg·kgâ1·dayâ1, i.p.) or vitamin E (200 IU/kg/every other day, i.p.). After 2 months, mean systolic blood pressure, serum lipid profile, glycaemia, and fat index were examined. By enzymeâlinked immunosorbent assay, the serum concentrations of insulin, leptin, adiponectin, and paraoxonase 1, and by realâtime polymerase chain reaction as well as western blotting, key liver elements in cholesterol hemostasis (LDLR, CYP7A1, ABCG5 and 8) and insulin signaling (pâAkt/Akt and pâPI3K/PI3K) were measured. BPA increased mean systolic blood pressure, total cholesterol, and lowâdensity lipoprotein cholesterol and reduced paraoxonase1 and the hepatic expression of both ABCG5 and ABCG8. It increased the body fat index, leptin, adiponectin, insulin, and glycaemia level and decreased the hepatic protein expression of pâAkt/Akt and pâPI3K/PI3k. GSE, resveratrol, or vitamin E coadministration along with BPA restored the detrimental effects of BPA in some levels.
Herein, the predisposing effects of BPAâinduced metabolic syndrome were restored by GSE and resveratrol, linked to the regulation of insulin signaling, ABCG8 expression, and their antioxidant properties.