Effect of sesamin on expression of inducible nitric oxide synthase and nitrotyrosine in rat liver tissue with metabolic syndromic hepatic steatosis

AIM:To study the effect of sesamin on expression of inducible nitric oxide synthase(iNOS)and nitrotyrosine(NT)in rat liver tissue with metabolic syndromic hepatic steatosis. METHODS:The rat model of metabolic syndromic hepatic steatosis was induced by operation of two kidneys with one clip(2K1C)and high-fat. The rats taken from that successful model were randomly divided into model group and sesamin(120,60,and 30 mg·kg-1·d-1)groups. In addition,the sham-operated group was set up. The rats in treated group were given sesamin intragastrically everyday for 8 weeks. The levels of blood lipids(TC,TG and FFA)in serum were detected. The activity of SOD and MDA level in the liver homogenate were determined. The expressions of iNOS and NT proteins were detected by Western blotting analysis. The histopathological changes were observed by HE staining in the liver tissues. RESULTS:Compared to model groups,sesamin(120,60 mg·kg-1)significantly inhibited the elevation of serum TC,TG,FFA,and MDA in liver homogenate(P0.05),and increased the activity of SOD(P0.05). It also decreased the protein expression of iNOS and NT(P0.05),and ameliorated the degree of hepatic steatosis. CONCLUSION:Sesamin prevents and cures the metabolic syndromic hepatic steatosis. The mechanism is probably mediated through decreasing the protein expression of iNOS and NT,and alleviating the oxidative stress in addition to regulating the lipid metabolism.