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A preclinical study on the protective effect of melatonin against methotrexate-induced small intestinal damage: effect mediated by attenuation of nitrosative stress, protein tyrosine nitration, and PARP activation

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Abstract

Purpose

One of the major toxic side effects of methotrexate (MTX) is enterocolitis. To date, there is no efficient standard treatment for this side effect. Nitrosative stress is reported to play a critical role in MTX-induced mucositis. The purpose of this study is to investigate whether pretreatment with melatonin, an inhibitor of nitro-oxidative stress, prevents MTX-induced mucositis in rats.

Methods

Rats were pretreated with melatonin (20 and 40 mg/kg body weight) i.p. daily 1 h before MTX (7 mg/kg body weight) administration for three consecutive days. After the final dose of MTX, the rats were killed and the small intestines were used for analysis.

Results

The small intestines of MTX-treated rats showed moderate to severe injury. The villi were distorted, blunted, and atrophied and focally absent in various segments of the small intestines. Crypt abscesses were also found, suggesting an inflammatory response. Pretreatment with melatonin had a dose-dependent protective effect on MTX-induced mucositis. Morphology was saved to a moderate extent with 20 mg melatonin pretreatment, and near-normal morphology was achieved with 40 mg melatonin pretreatment. Damage to the villi and crypt abscess was reduced. The villi/crypt ratio was almost restored. Melatonin pretreatment protected the small intestines from MTX-induced damage by attenuating nitrosative stress, protein tyrosine nitration and PARP expression.

Conclusion

Because of its versatility in protecting against nitro-oxidative stress and reducing inflammation, we suggest that melatonin could be beneficial in ameliorating MTX-induced enteritis in humans.

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Acknowledgments

The authors would like to thank CSIR, New Delhi, for the financial support. Mr. Viswa Kalyan Kolli is a senior research fellow on the project.

Conflict of interest

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Authors and Affiliations

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

    Viswa Kalyan Kolli, Minnie Faith, Hemalatha Ramamoorthy, Kasthuri Natarajan & Premila Abraham

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

    Indirani Kanakasabapathy & Bina Isaac

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  1. Viswa Kalyan Kolli
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  2. Indirani Kanakasabapathy
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  3. Minnie Faith
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Correspondence to Premila Abraham.

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Kolli, V.K., Kanakasabapathy, I., Faith, M. et al. A preclinical study on the protective effect of melatonin against methotrexate-induced small intestinal damage: effect mediated by attenuation of nitrosative stress, protein tyrosine nitration, and PARP activation. Cancer Chemother Pharmacol 71, 1209–1218 (2013). https://doi.org/10.1007/s00280-013-2115-z

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  • DOI: https://doi.org/10.1007/s00280-013-2115-z

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