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Oxygen free radical induced damage during intestinal ischemia/reperfusion in normal and xanthine oxidase deficient rats

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Abstract

This study looks at the role of xanthine oxidase (XO) in ischemia/reperfusion (I/R) induced intestinal mucosal damage using normal and xanthine oxidase deficient rats. Tungstate feeding for 3 days depleted the intestinal mucosal XO by 80%. A ligated loop of the rat small intestine (both normal and XO-deficient) was subjected to 1 h of total ischemia followed by 5 min revascularisation. The ensuing mucosal damage was assessed by biochemical and histological studies. Ischemia or I/R increased the XO levels in normal rats without any change in XO-deficient rats. Myeloperoxidase (a neutrophil marker) level was increased in both group of rats but it was comparatively higher in the XO-deficient rats. Accumulation of peroxidation products such as malondialdehyde, conjugated diene and increased production of hydroxyl radicals by microsomes were seen after ischemia and I/R and were similar in normal and XO-deficient rats. Studies on other parameters of peroxidation showed a decrease in polyunsaturated fatty acids and alpha-tocopherol, an increase in cysteine and cystine levels after I/R and were similar in both normal and XO-deficient rats. Histological results indicated gross morphological changes in the intestinal mucosa due to ischemia and I/R, and the damage was more severe in XO-deficient rats. These observations suggest that oxygen-derived free radicals are involved in the intestinal mucosal damage during I/R and infiltrated neutrophils rather than XO may be the primary source of free radicals under these conditions.

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Authors and Affiliations

  1. The Wellcome Trust Research Laboratory, Department of Gastrointestinal Sciences, Christian Medical College & Hospital, 632 004, Vellore, Tamilnadu, India

    S. Nalini, M. M. Mathan & K. A. Balasubramanian

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  1. S. Nalini
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  2. M. M. Mathan
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  3. K. A. Balasubramanian
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Nalini, S., Mathan, M.M. & Balasubramanian, K.A. Oxygen free radical induced damage during intestinal ischemia/reperfusion in normal and xanthine oxidase deficient rats. Mol Cell Biochem 124, 59–66 (1993). https://doi.org/10.1007/BF01096382

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  • DOI: https://doi.org/10.1007/BF01096382

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