Rag2-deficient IL-1 Receptor Antagonist-deficient Mice Are a Novel Colitis Model in Which Innate Lymphoid Cell-derived IL-17 Is Involved in the Pathogenesis

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  • Akitsu Aoi
    Center for Experimental Medicine and Systems Biology, The Institute of Medical Science, The University of Tokyo, 4-6-1, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0032, Japan Research Institute for Biomedical Sciences, Tokyo University of Science, Chiba 278-0022, Japan
  • Kakuta Shigeru
    Center for Experimental Medicine and Systems Biology, The Institute of Medical Science, The University of Tokyo, 4-6-1, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan Present address: Department of Biomedical Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
  • Saijo Shinobu
    Center for Experimental Medicine and Systems Biology, The Institute of Medical Science, The University of Tokyo, 4-6-1, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan Present address: Department of Molecular Immunology, Medical Mycology Research Center, Chiba University, Chiba 263-8522, Japan
  • Iwakura Yoichiro
    Center for Experimental Medicine and Systems Biology, The Institute of Medical Science, The University of Tokyo, 4-6-1, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0032, Japan Research Institute for Biomedical Sciences, Tokyo University of Science, Chiba 278-0022, Japan

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Il1rn−/− mice spontaneously develop arthritis and aortitis by an autoimmune mechanism and also develop dermatitis by an autoinflammatory mechanism. Here, we show that Rag2−/−Il1rn−/− mice develop spontaneous colitis with high mortality, making a contrast to the suppression of arthritis in these mice. Enhanced IL-17A expression in group 3 innate lymphoid cells (ILC3s) was observed in the colon of Rag2−/−Il1rn−/− mice. IL-17A-deficiency prolonged the survival of Rag2−/−Il1rn−/− mice, suggesting a pathogenic role of this cytokine in the development of intestinal inflammation. Although IL-17A-producing T cells were increased in Il1rn−/− mice, these mice did not develop colitis, because CD4+Foxp3+ regulatory T cell population was also expanded. Thus, excess IL-1 signaling and IL-1-induced IL-17A from ILC3s cause colitis in Rag2−/−Il1rn−/− mice in which Treg cells are absent. These observations suggest that the balance between IL-17A-producing cells and Treg cells is important to keep the immune homeostasis of the colon.

Journal

  • Experimental Animals

    Experimental Animals 63 (2), 235-246, 2014

    Japanese Association for Laboratory Animal Science

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