Protective effect and mechanism of manganese superoxide dismutase mimic on ulcerative colitis induced by trinitrobenzene sulfonic acid in rats
10.12092/j.issn.1009-2501.2020.10.001
- VernacularTitle: 锰超氧化物歧化酶模拟物对三硝基苯磺酸诱导溃疡性结肠炎大鼠的保护作用及机制研究
- Author:
Yanhong WANG
1
Author Information
1. Department of Pharmacy, Gansu Provincial Hospital
- Publication Type:Journal Article
- Keywords:
2, 4, 6-trinitrobenzenesulfonic acid;
Antiinflammatory;
Manganese superoxide dismutase mimic;
Mechanism;
Ulcerative colitis
- From:
Chinese Journal of Clinical Pharmacology and Therapeutics
2020;25(10):1081-1087
- CountryChina
- Language:Chinese
-
Abstract:
AIM: To investigate the effects of manganese superoxide dismutase mimic (MnSODm) on 2, 4, 6-trinitrobenzene sulfonic acid (TNBS) induced ulcerative colitis (UC) in rats and to probe into its underlying mechanism. METHODS: Wistar rats were randomly divided into blank group, model group, sulfasalazine (SASP, 500 mg/kg) group, and different doses of MnSODm (10, 20 and 40 mg/kg) groups. Ulcerative colitis was induced in rats by rectal administration of 100 mg/kg TNBS dissolved in 50% ethanol. Rats were killed after SASP and different doses of MnSODm treatment 7 days. The disease activity index (DAI) was recorded, and then the colonic injury and inflammation were assessed by the colon weight/length ratio and microscopic damage scores. The serum and colon tissues activities myeloperoxidase (MPO) were detected by biochemistry method. The activities of glutathione peroxidase (GSH-Px), inducible nitric oxide synthase (iNOS), and the levels of glutathione (GSH) and NO in colon tissues were also detected. The levels of TNF-α, IL-4 and IL-10 in the colon tissues were measure by ELISA. Western blot was undertaken to determine the phosphorylation levels of AKT and PI3K. RESULTS: Compared with the model group, the colonic weight/length ratios, microscopic damage scores and colon tissues and serum MPO activity were significantly decreased in MnSODm groups (P<0.05 or P<0.01). INOS, NO, TNF-α, PI3K, p-AKT levels in colon tissues were also significantly decreased in MnSODm treatment groups; while the activity of GSH-Px and the concentration of GSH, IL-4 and IL-10 obviously increased (P<0.05, P<0.01). CONCLUSION: MnSODm is protective against colitis via antioxidant activity and by inhibiting inflammatory mediators and then down-regulating PI3K/AKT signaling pathways.
