Ketotifen inhibits Clostridium difficile toxin A-induced enteritis in rat ileum

Charalabos Pothoulakis*, Fanny Karmeli, Ciaran P. Kelly, Rami Eliakim, Manher A. Joshi, Connor J. O'Keane, Ignazio Castagliuolo, J. Thomas LaMont, Daniel Rachmilewitz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Background:Clostridium difficile toxin A is the principal mediator of inflammatory enterocolitis in experimental animals. The purpose of this study was to explore the effect of ketotifen, an anti-inflammatory drug, on toxin A-induced enterotoxicity in rat ileum. Methods: The effects of intragastric administration of ketotifen on secretion, mannitol permeability, histological damage, and mucosal levels of leukotriene B4, leukotriene C4, and platelet activating factor in toxin A-exposed rat ileal loops were measured in vivo. The effects of ketotifen on toxin A-mediated release of rat mast cell protease II (rat mucosa mast cell product) release were also measured in rat ileal explants in vitro. The effect of ketotifen on neutrophil migration in vitro was also evaluated. Results: Ketotifen pretreatment inhibited toxin A-associated intestinal secretion by 42.5% and mannitol permeability by 56.3% and reduced epithelial cell inflammation and necrosis. These effects were associated with reduced levels of leukotriene B4 by 65.8%, leukotriene C4 by 88.8%, platelet activating factor by 77.8%, and inhibition of rat mast cell protease II by 58.4%. In addition, pretreatment of neutrophils with ketotifen inhibited neutrophil migration in vitro. Conclusions: The protective effect of ketotifen in this animal model was associated with significant inhibition of release of mast cells and neutrophil derived mediators, supporting their involvement in C. difficile enteritis.

Original languageEnglish
Pages (from-to)701-707
Number of pages7
Issue number3
StatePublished - Sep 1993
Externally publishedYes


FundersFunder number
National Institute of Diabetes and Digestive and Kidney DiseasesR37DK034583


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