International Immunology, Vol. 15, No. 4, pp. 483-490,
April 2003
© 2003 Japanese Society for Immunology
IL-1 is required for allergen-specific Th2 cell activation and the development of airway hypersensitivity response
1 Center for Experimental Medicine, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan 2 Second Department of Physiology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan 3 Research Center Kyoto, Bayer Yakuhin, Ltd, 6-5-1-3 Kunimidai, Kizu-cho, Sorakugun, Kyoto 619-0216, Japan 4 Present address: Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 5 Present address: Institute for Experimental Animals, School of Medicine, Kanazawa University, 13-1 Takaramachi, Kanazawa 920-8640, Japan
Correspondence to: Y. Iwakura; E-mail: iwakura{at}ims.u-tokyo.ac.jp
Transmitting editor: S. J. Galli
IL-1 is a pro-inflammatory cytokine consisted of two molecular species, IL-1
and IL-1ß, and the IL-1 receptor antagonist (IL-1Ra) is a natural inhibitor of both molecules. Although it is suggested that IL-1 potentiates immune responses mediated by Th2 cells, the role of IL-1 in asthma still remains unclear. In this study, we demonstrate that the ovalbumin (OVA)-induced airway hypersensitivity response (AHR) in IL-1
/ß-deficient (IL-1
/ß/) mice was significantly reduced from the levels seen in wild-type mice, whereas the responses seen in IL-1Ra/ mice were profoundly exacerbated, suggesting that IL-1 is required for Th2 cell activation during AHR. OVA-specific T cell proliferation, IL-4 and IL-5 production by T cells, and IgG1 and IgE production by B cells in IL-1
/ß/ mice were markedly reduced compared with these responses in wild-type mice; such responses were enhanced in IL-1Ra/ mice. Using IL-1
/ and IL-1ß/ mice, we determined that both IL-1
and IL-1ß are involved in this reaction. Both IgG1 and IgE levels were reduced in IL-1ß/ mice, while only IgE levels were affected in IL-1
/ mice, indicating a functional difference between IL-1
and IL-1ß. These observations indicate that IL-1 plays important roles in the development of AHR.
Keywords: IL-1 receptor antagonist, IL-1
, IL-1ß, knockout mouse
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