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• W2059835530 abstract "Background. The mechanisms underlying the frequent development of carcinomas associated with ulcerative colitis (UC) are not understood. Cellular antioxidants play a crucial role in protection against neoplastic disease. The purpose of this study is to investigate a critical balance between free radical activity and the antioxidant defense system in carcinogenesis associated with UC, using a model of experimental colitis induced in mice by dextran sulfate sodium (DSS) treatment. Methods. Chronic colitis was induced by feeding the mice for 7 days with 4% DSS, followed by drinking water alone for the subsequent 14 days. Animals were sacrificed after one, two, three, or four cycles of DSS administration. Development of dysplastic epithelium and invasive carcinoma was histologically examined. Lipid peroxide level was estimated by measuring malondialdehyde (MDA) content. Alterations in MDA content and superoxide dismutase (SOD) activity in colonic tissues together with production of serum tumor necrosis factor (TNF)-α were determined. Results. Colonic neoplasms including dysplastic epithelium and invasive carcinoma developed in 28.6 and 25.0% of the animals at the end of the third and fourth cycles, respectively. In accordance with elevation of serum TNF-α level, there was a substantial increase in MDA in the colonic mucosa, while tissue SOD activity tended to be suppressed during the DSS treatment periods. Dysplastic epithelium and invasive carcinoma revealed significantly lower SOD levels compared with colonic colitis, although MDA levels were not statistically different among these colonic diseases. Conclusions. The results obtained in this experimental model suggest that an impaired antioxidant defense system might be critical for cancer development associated with UC." @default.
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• W2059835530 date "2002-02-01" @default.
• W2059835530 modified "2023-10-17" @default.
• W2059835530 title "Impaired Antioxidant Defense System of Colonic Tissue and Cancer Development in Dextran Sulfate Sodium-Induced Colitis in Mice" @default.
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• W2059835530 doi "https://doi.org/10.1006/jsre.2001.6314" @default.
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