CAT and colitis: Some studies have indicated that the oral administration of live recombinant lactobacillus strains producing superoxide dismutase (SOD) could ameliorate TNBS-induced colitis in mice, and enhance the activities of catalase (CAT), SOD, and glutathione peroxidase (GSH-Px) in the serum, liver, and intestinal tract of mice, as well as reduce the levels of MDA [6].