Baicalein, a naturally occurring flavone, has been proved as a promising chemopreventive compound for many chronic human diseases. The aim of this work was to investigate whether treatment with baicalein prevented nonalcoholic steatohepatitis (NASH) induced by methionine-choline-deficient (MCD) diet. Rats were divided into four experimental groups and fed for 8 weeks as follows: (1) control rats; (2) control rats treated with baicalein (intraperitoneal injection of 10mg/kg); (3) MCD-diet-fed rats; (4) MCD-diet-fed rats treated with baicalein. Treatment with baicalein prevented MCD-diet-induced NASH, as evidenced by reduced histological scores, apoptosis, activities of ALT and AST, and hepatic fat accumulation in rats. Treatment with baicalein abated MCD-diet-induced oxidative stress through enhancing Nrf2/HO-1 pathway and activities of SOD and catalase in livers. Treatment with baicalein preserved hepatic mitochondrial function in MCD-diet fed rats. Treatment with baicalein reduced hepatic NO formation through suppressing MCD-diet-induced iNOS activation, and suppressed MCD-diet-induced inflammation through suppressing NFκB activation and reducing IL-6 and TNFα expressions in livers. Treatment of MCD-diet fed rats with baicalein had a beneficial modulation on expression profiles of fatty acid metabolism genes in livers. The results support the investigation of baicalein as a therapeutic candidate for NASH induced by MCD diet in rats.
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