期刊
GASTROENTEROLOGY
卷 140, 期 1, 页码 254-+出版社
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1053/j.gastro.2010.09.047
关键词
Colitis; Helminth; IBD; Th17
资金
- National Institute of Allergy and Infectious Diseases, National Institutes of Health
- National Institutes of Health [AI61570]
- William and Shelby Modell Family Foundation
- MRC [MC_UP_A253_1028] Funding Source: UKRI
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [ZIAAI000829, R01AI061570, ZIAAI001019, ZIAAI000833] Funding Source: NIH RePORTER
- Medical Research Council [MC_UP_A253_1028] Funding Source: researchfish
BACKGROUND & AIMS: The cytokine interleukin (IL)-10 is required to maintain immune homeostasis in the gastrointestinal tract. IL-10 null mice spontaneously develop colitis or are more susceptible to induction of colitis by infections, drugs, and autoimmune reactions. IL-13 regulates inflammatory conditions; its activity might be compromised by the IL-13 decoy receptor (IL-13R alpha 2). METHODS: We examined the roles of IL-13 and IL-13R alpha 2 in intestinal inflammation in mice. To study the function of IL-13R alpha 2, il10(-/-) mice were crossed with il13r alpha 2(-/-) to generate il10(-/-) il13r alpha 2(-/-) double knockout (dKO) mice. Colitis was induced with the gastrointestinal toxin piroxicam or Trichuris muris infection. RESULTS: Induction of colitis by interferon (IFN)-gamma or IL-17 in IL-10 null mice requires IL-13R alpha 2. Following exposure of il10(-/-) mice to piroxicam or infection with T muris, production of IL-13R alpha 2 increased, resulting in decreased IL-13 bioactivity and increased inflammation in response to IFN-gamma or IL-17A. In contrast to il10(-/-) mice, dKO mice were resistant to piroxicam-induced colitis; they also developed less severe colitis during chronic infection with T muris infection. In both models, resistance to IFN-gamma and IL-17-mediated intestinal inflammation was associated with increased IL-13 activity. Susceptibility to colitis was restored when the dKO mice were injected with monoclonal antibodies against IL-13, confirming its protective role. CONCLUSIONS: Colitis and intestinal inflammation in IL10(-/-) mice results from IL-13R alpha 2-mediated attenuation of IL-13 activity. In the absence of IL-13R alpha 2, IL-13 suppresses proinflammatory Th1 and Th17 responses. Reagents that block the IL-13 decoy receptor IL-13R alpha 2 might be developed for inflammatory bowel disease associated with increased levels of IFN-gamma and IL-17.
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