Published online Jul 21, 2019. doi: 10.3748/wjg.v25.i27.3572
Peer-review started: April 10, 2019
First decision: May 9, 2019
Revised: May 27, 2019
Accepted: June 8, 2019
Article in press: June 8, 2019
Published online: July 21, 2019
Processing time: 101 Days and 21.1 Hours
Rapid mucosal healing after an intestinal inflammatory episode is considered beneficial to diminishing the relapse risk in inflammatory bowel disease patients. However, the event progression of colon mucosal repair after a colitic flare has barely been studied.
A better understanding of the events associated with inflammation resolution and mucosal healing are necessary to identify potential targets for colon mucosal healing enhancement.
To document longitudinal modifications of the colon mucosa and luminal ecosystem following an episode of chemically-induced colitis.
Evolution of colon mucosa inflammation and healing indicators, as well the changes in colonic luminal environment, were assessed in dextran sodium sulfate-treated mice during the 3 wk after the maximal intensity of colitis. Complementary approaches such as measurement of physicochemical parameters in colonic luminal content, mucosa-adherent microbiota composition and activity, colon mucosa histo-morphological analysis, permeability tests, and expression of numerous factors involved in epithelial inflammation and/or repair were used.
Indications of epithelial repair were observed early, while inflammation was still active. However, colitis-induced luminal colonic environment alterations and microscopic abnormalities of colon mucosa persisted even though inflammation had been resolved.
The longitudinal evolution study of the overlapping events that participated in epithelial repair revealed modulation factors (Il-15, Il-33, and Saa) that may prove to be potential therapeutic targets for mucosal healing enhancement.
Since repairing processes were launched by mucosal inflammation, the interventional time window is an important parameter to take into account in clinical trials aiming to accelerate intestinal mucosal healing.