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Effects of indomethacin on the rat small intestinal mucosa: immunohistochemical and biochemical studies using anti-mucin monoclonal antibodies

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Abstract

Background

The luminal surface of the gastrointestinal tract is covered by a viscoelastic gel layer that acts as a protective barrier against the intraluminal environment. Because the situation of the small intestine has not been elucidated to the same degree as other sections, in this study, we investigated the effects of indomethacin on the rat small intestinal mucosa.

Methods

Male Wistar rats were given indomethacin 10 mg/kg s-c and sacrificed 1, 3, 7, or 14 days later. The small intestine was opened along the anti-mesenteric side, and examined macroscopically. Total mucin content in the small intestinal epithelium was measured and immunoreactivity was examined using anti-mucin monoclonal antibodies HCM31 and PGM34.

Results

Indomethacin caused punched out and linear ulcers located mostly along the mesenteric margin of the distal jejunum with sparing of the ileum. Histological examination showed sialomucin recognized by HCM31 increased on day 3 especially in the regenerating epithelium around the ulcer edge. Furthermore, the surface mucous gel layer displayed a multilaminated pattern, consisting of non-sulfated sialomucin-rich layers and sulfated mucin-rich layers, where both mucins had the common core protein, MUC2. Biochemical measurements also showed the total mucin content of the jejunum increased transiently and HCM31-positive mucin increased approximately 4 times greater than baseline on day 3, but no marked changes were observed in the ileum, with few ulcers observed.

Conclusions

Indomethacin administration causes quantitative and qualitative change in jejunal mucin. In particular, sialomucin plays an important role in regenerating epithelium during the healing process following indomethacin-induced mucosal damage.

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Acknowledgments

We express our sincere thanks to S. Sugawara, M. Hashimura, and Y. Numata for technical assistance. Part of this work was supported by Grants from the Shin-Caterpillar Mitsubishi Co., Grants from the SRL Co., and Grants from the Integrative Research Project of the Graduate School of Medical Sciences, Kitasato University.

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Correspondence to Kazuhiko Ishihara.

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Iwai, T., Ichikawa, T., Goso, Y. et al. Effects of indomethacin on the rat small intestinal mucosa: immunohistochemical and biochemical studies using anti-mucin monoclonal antibodies. J Gastroenterol 44, 277–284 (2009). https://doi.org/10.1007/s00535-009-0007-0

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  • DOI: https://doi.org/10.1007/s00535-009-0007-0

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