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Updated: May 24, 2026

Investigating Intestinal Inflammation in DSS-induced Model of IBD
Published on: February 1, 2012
Indoleamine 2,3-dioxygenase expression in human inflammatory bowel disease
Liping Zhou1, Huan Chen, Quan Wen
1Department of Gastroenterology, West China Hospital of Sichuan University, Chengdu, Sichuan, China.
Indoleamine 2,3-dioxygenase (IDO) is overexpressed in inflammatory bowel disease and may link innate and adaptive immunity. Steroids and salicylates reduce IDO expression, suggesting a potential therapeutic target for Crohn's disease and ulcerative colitis.
Area of Science:
- Immunology
- Gastroenterology
- Molecular Biology
Background:
- Inflammatory bowel disease (IBD), including Crohn's disease and ulcerative colitis, is characterized by chronic inflammation.
- Indoleamine 2,3-dioxygenase (IDO) is an enzyme involved in tryptophan metabolism and immune regulation.
Purpose of the Study:
- To determine the expression pattern of IDO in human IBD.
- To investigate the impact of various therapies on intestinal IDO expression.
Main Methods:
- Immunohistochemistry was employed to assess IDO expression.
- Quantification of IDO-positive cells in 10 high-power fields per patient.
Main Results:
- IDO was expressed in both the lamina propria and epithelium of the intestine.
- IDO expression was elevated in IBD lesions and correlated with inflammation severity.
- IDO expression decreased with steroid and salicylate treatment but not with infliximab therapy.
Conclusions:
- IDO is upregulated in IBD and may serve as a link between innate and adaptive immunity.
- Steroids and salicylates may exert their effects by inhibiting IDO.
- Targeting IDO could be a potential therapeutic strategy for IBD remission.
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