CD4+ T cell-specific deletion of IL-4 receptor α prevents ovalbumin-induced anaphylaxis by an IFN-γ-dependent mechanism

Nieuwenhuizen, Natalie, Herbert, De'Broski R., Lopata, Andreas L., and Brombacher, Frank (2007) CD4+ T cell-specific deletion of IL-4 receptor α prevents ovalbumin-induced anaphylaxis by an IFN-γ-dependent mechanism. Journal of Immunology, 179 (5). pp. 2758-5765.

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Abstract

IL-4Rα-mediated STAT6 activation serves an essential role in various animal models of allergy and asthma at both the sensitization and effector phases. IL-4 and IL-13 signaling via the IL-4Rα chain exacerbates murine anaphylaxis, but the cell-specific requirements for IL-4Rα expression are unclear. The purpose of this study was to elucidate the mechanisms of systemic anaphylaxis to OVA in gene-targeted mice with a deletion of the IL-4Rα chain in the macrophage/neutrophil or CD4+ T lymphocyte population. Results demonstrated that anaphylaxis in this model was entirely dependent upon the FcγRII/III and was associated with mast cell degranulation. Expression of the IL-4Rα on CD4+ T cells, but not macrophages or neutrophils, was critical for severe anaphylaxis, characterized by diarrhea, hypothermia, and death. Ab depletion experiments demonstrated that IFN-γ protected against mortality and severe intestinal pathology despite the presence of Ag and specific Ab. This protection was associated with reduced levels of mast cell protease, a marker of mast cell degranulation, suggesting that IFN-γ may inhibit mast cell degranulation in vivo. These data suggest that it may be possible to limit the severity of anaphylaxis using rational therapies designed to increase numbers of IFN-γ-producing cells by targeting IL-4Rα signaling in CD4+ T lymphocytes.

Item ID: 15250
Item Type: Article (Refereed Research - C1)
ISSN: 1550-6606
Date Deposited: 28 Jan 2011 01:50
FoR Codes: 06 BIOLOGICAL SCIENCES > 0601 Biochemistry and Cell Biology > 060199 Biochemistry and Cell Biology not elsewhere classified @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920108 Immune System and Allergy @ 100%
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