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Methotrexate-induced nitrosative stress may play a critical role in small intestinal damage in the rat

  • Organ Toxicity and Mechanisms
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Abstract

Methotrexate (MTX), a structural analogue of folic acid, is widely used as a chemotherapeutic agent for leukemia and other malignancies. One of the major toxic effects of MTX is intestinal injury and enterocolitis .The mechanism of gastrointestinal toxicity of methotrexate has not been investigated completely. Therefore cancer chemotherapy has to be accompanied by symptomatic therapy such as antibiotics and anti-diarrheal drugs. It is important to investigate the mechanism by which methotrexate induces intestinal damage in order to perform cancer chemotherapy effectively by preventing the side effects. This study aimed at investigating whether nitrosative stress plays a role in methotrexate induced small intestinal damage using a rat model. Adult male rats were administered methotrexate at the dose of 7 mg/kg body weight intraperitoneally for 3 consecutive days and sacrificed 12 or 24 h after the final dose of methotrexate. Vehicle treated rats served as control. The intestinal tissue was used for light microscopic studies and markers of nitrosative stress including tissue nitrite level and nitrotyrosine. Myeloperoxidase (MPO) activity, a marker of neutrophil infiltration was also measured in intestinal homogenates. The villi were damaged at 12 h and the damage progressed and became severe at 24 h after the final dose of MTX. Biochemically, tissue nitrate was elevated fivefold at 12 h and fourfold at 24 h after the final dose of MTX as compared with control. Nitrotyrosine, measured immunohistochemically was detected in all the parts of the small intestine. Duodenum stained the most for nitrotyrosine, followed by ileum and then jejunum. The staining for nitrotyrosine was more intense at 24 h as compared with 12 h after the final dose of methotrexate. There was marked neutrophil infiltration as evidenced by increase in MPO activity in the small intestines. In conclusion, the results of the present study reveal that nitrosative stress may play a critical role in methotrexate induced small intestinal damage. Intervention studies using nitric oxide synthase inhibitors is being carried out in order to confirm the role of nitrosative stress in methotrexate induced small intestinal damage.

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Acknowledgments

The authors acknowledge the Council for Scientific and Industrial Research (CSIR), New Delhi for the financial support for the study. Mr. Viswa Kalyan Kolli is a junior research fellow under the present study. Dr Bina Isaac, Professor in Anatomy is acknowledged for her assessment in light microscopic studies.

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Authors and Affiliations

  1. Department of Biochemistry, Christian Medical College, Bagayam, Vellore, 632002, Tamil Nadu, India

    Viswa Kalyan Kolli & Premila Abraham

  2. Department of Anatomy, Christian Medical College, Bagayam, Vellore, 632002, Tamil Nadu, India

    Suganthy Rabi

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  1. Viswa Kalyan Kolli
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  2. Premila Abraham
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  3. Suganthy Rabi
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Correspondence to Premila Abraham.

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Kolli, V.K., Abraham, P. & Rabi, S. Methotrexate-induced nitrosative stress may play a critical role in small intestinal damage in the rat. Arch Toxicol 82, 763–770 (2008). https://doi.org/10.1007/s00204-008-0287-9

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  • DOI: https://doi.org/10.1007/s00204-008-0287-9

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