Abstract
The effect of irsogladine maleate, a widely used antiulcer drug in Japan, on indomethacin-induced small intestinal lesions was examined in rats. Animals without fasting were given indomethacin (10 mg/kg, s.c.) and sacrificed 24 h later. Irsogladine (1–10 mg/kg) or 16,16-dimethyl prostaglandin E2 (dmPGE2 0.03 mg/kg) was given p.o. twice, 0.5 before and 6 h after indomethacin, while ampicillin (800 mg/kg) was given twice, 18 and 0.5 h before. Indomethacin caused severe lesions in the small intestine, mainly the jejunum and ileum, accompanied by intestinal hypermotility, the up-regulation of inducible nitric oxide synthase (iNOS) expression, and an increase of myeloperoxidase (MPO) activity as well as enterobacterial invasion in the mucosa. These events were all prevented by both dmPGE2 and ampicillin, except the intestinal hypermotility which was only prevented by dmPGE2. Likewise, irsogladine also significantly and dose-dependently prevented these lesions at >1 mg/kg. This agent alone increased mucus secretion and significantly suppressed the decreased mucus response to indomethacin, resulting in a suppression of the bacterial invasion as well as the increase in MPO activity and iNOS expression. The protective effect of irsogladine was mimicked by isobutylmethylxanthine, a nonselective inhibitor of phosphodiesterase (PDE), as well as rolipram, a selective PDE4 inhibitor. These results suggest that irsogladine protects the small intestine against indomethacin-induced lesions, and this effect may be associated with the increased mucus secretion, probably due to the inhibitory actions of PDE, resulting in suppression of enterobacterial invasion and iNOS expression.
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Kamei, K., Kubo, Y., Kato, N. et al. Prophylactic Effect of Irsogladine Maleate Against Indomethacin-Induced Small Intestinal Lesions in Rats. Dig Dis Sci 53, 2657–2666 (2008). https://doi.org/10.1007/s10620-008-0199-9
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DOI: https://doi.org/10.1007/s10620-008-0199-9