Ameliorative role of conjugated linolenic acid isomers against oxidative DNA damage induced by sodium arsenite in rat model.

The present study was undertaken to evaluate the ameliorative role of α-eleostearic acid and punicic acid, isomers of conjugated linolenic (CLnA) acid, against oxidative stress induced DNA damage. Male albino rats were divided into six groups. Group 1 and 2 were normal control and sodium arsenite treated (Sa; 10 mg/kg BW) control respectively. Group 3-6 were orally treated with different doses of two fatty acids (0.5% and 1.0% of total lipid given for each isomer) along with sodium arsenite (Sa; 10 mg/kg BW). Comet assay of blood leukocytes showed that administration of CLnA reduced DNA damage significantly (P<0.05) which was determined by tail DNA percent and olive tail moment. Results showed that activity of antioxidant enzymes viz. catalase, superoxide dismutase (SOD), glutathione peroxidase (GPx) and reduced glutathione (GSH) in plasma, liver and erythrocyte lysate decreased and activity of nitric oxide synthase in plasma and liver increased significantly due to oxidative stress generated by sodium arsenite. Administration of CLnA isomers restored all the altered parameters and also reduced lipid peroxidation and leakage of transaminase enzymes from liver to blood due to liver injury. α-Eleostearic acid was more efficient antioxidant than punicic acid against oxidative DNA damage.