title: CD4+CD25+ regulatory T cells have divergent effects on intestinal inflammation in IL-10 gene-deficient mice.
abstract: The regulatory effect of murine CD4+CD25+ T-cells in vivo appears to be dependent on the secretion of IL-10. The lack of IL-10 in the IL-10 gene-deficient mouse has a profoundly negative effect on the mouse's regulation of the response to intestinal bacteria, resulting in severe enterocolitis. We investigated the effect of neonatal injection with wild-type CD4+CD25+ T-cells on the intestinal immune response in IL-10 gene-deficient mice. At the time of analysis, 8-15 weeks later, all mice demonstrated an increased, antigen-stimulated systemic response. However, the intestinal response was divergent with about half of the mice developing an intestinal inflammation with a high injury score, the other half demonstrating a remarkable reduction in injury score with a marked decrease in intestinal IFNgamma release. Our data demonstrate that CD4+CD25+ T-cells can be activated in IL-10 gene-deficient mice and that this stimulation under stringent conditions has the potential to reduce intestinal inflammation.
authors.affiliation: Department of Medicine, Division of Gastroenterology, Center of Excellence for Gastrointestinal Inflammation and Immunity Research, University of Alberta, Zeidler Ledcor Building, Edmonton, Alberta, Canada. bsydora@ualberta.ca
authors.forename: Beate C
authors.initials: BC
authors.lastname: Sydora
authors.forename: Sarah M
authors.initials: SM
authors.lastname: MacFarlane
authors.forename: Michele M
authors.initials: MM
authors.lastname: Tavernini
authors.forename: Jason S G
authors.initials: JS
authors.lastname: Doyle
authors.forename: Richard N
authors.initials: RN
authors.lastname: Fedorak
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D015212:Inflammatory Bowel Diseases / Q000276:immunology*; D016753:Interleukin-10 / Q000172:deficiency / Q000276:immunology*; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology; D051379:Mice; D008822:Mice, Transgenic; D013154:Spleen / Q000166:cytology / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D016753:Interleukin-10