Pathogenesis and mechanisms of protease antigen-induced innate-type airway inflammation

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After inhalation of papain (mimic of allergen with protease activity), we found 1. Early reaction (1 day) with neutrophil-dominant inflammation was induced by IL-33-release via activation of non-T cells, whereas late reaction (7 days) with eosinophil-dominant inflammation was induced by IL-33-release via activation of rag-2+ cells. 2. Biphasic (6h and 72 h) IL-13 induction was observed after IL-33 release which peaks at 6h after inhalation. 3. Immune response against papain varied with gender, age and strain. These findings may help understanding the development and pathogenesis of bronchial asthma.