SOD1 and diabetes mellitus: Statistically significant decreases in the activities of SOD, CAT and GSH-PX were observed in the WT-DM group compared with the WT-NC group (p < 0.001, p < 0.05 and p < 0.0001, respectively), but the MDA activities in the WT-DM group was significantly increased compared with it in the WT-NC group (p < 0.001).