Treatment of experimental colitis by oral tolerance induction: A central role for suppressor lymphocytes

Yaron Ilan*, Sarah Weksler-Zangen, Shomron Ben-Horin, Judith Diment, Bernhard Sauter, Elazar Rabbani, Dean Engelhardt, Namita Roy Chowdhury, Jayanta Roy Chowdhury, Eran Goldin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


OBJECTIVE: Inflammatory bowel diseases (IBD) are immune-mediated disorders wherein an imbalance between proinflammatory (Th1) and antiinflammatory (Th2) cytokines is thought to play a role in the pathogenesis. The aim of this study was to test whether induction of oral tolerance to proteins extracted from inflammatory colon alleviates experimental colitis, and whether oral tolerization mediated by suppressor cells can induce immune tolerance. METHODS: Colitis was induced in rats by intracolonic instillation of trinitrobenzenesulfonic acid (TNBS). Rats received five oral doses of colonic proteins extracted from TNBS-colitis colonic wall. Splenocytes harvested from tolerized and control rats were transplanted into irradiated naive rats. RESULTS: Feeding of colitis- extracted proteins ameliorated colonic inflammation, as shown by reduction of colonic ulcerations, as well as decreased diarrhea, intestine and peritoneal adhesions, wall thickness, and edema. A marked reduction of the fraction of injured colonic area and colon weight, and decrease in colon weight, were observed in tolerized rats versus controls. Histological parameters for colitis were markedly improved in tolerized animals that showed significant reduction in inflammatory response and mucosal ulcerations. Tolerized rats developed an increase in TGFβ1 and a decrease in IFNγ serum levels. TNBS- induced colitis was significantly attenuated in naive recipients of splenocytes from tolerized rats, compared with rats that received splenocytes from control donors. CONCLUSIONS: Induction of oral tolerance to colitis- extracted proteins downregulates the anticolon immune response, thereby ameliorating experimental colitis. Suppressor lymphocytes mediate the tolerance by induction of a shift from a proinflammatory to an antiinflammatory immune response. (C) 2000 by Am. Coll. of Gastroenterology.

Original languageEnglish
Pages (from-to)966-973
Number of pages8
JournalAmerican Journal of Gastroenterology
Issue number4
StatePublished - Apr 2000
Externally publishedYes


FundersFunder number
ENZO Biochem Inc.RO1-DK 39137, P30-DK 41296, ROI-DK 46057
National Institute of Diabetes and Digestive and Kidney DiseasesR01DK046057
National Institute of Diabetes and Digestive and Kidney Diseases
United States-Israel Binational Science Foundation


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