Early-type hypersensitivity-associated airway inflammation and eosinophilia induced by Dermatophagoides farinae in sensitized mice.

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Abstract
In a murine ear-swelling model, we demonstrated a unique hypersensitivity response and defined it as early-type hypersensitivity (ETH). ETH was characterized by increased vasopermeability and edematous change that occurred within 1 h at the site of Ag challenge. In this study, intranasal challenge with Dermatophagoides farinae (Df) on Df-sensitized BALB/c mice induced an ETH response in the lungs. The lung ETH was manifested by an increase in wet lung weight, production of TNF-alpha in bronchoalveolar lavage fluids, and hyperemia and edematous change around vessels of small airways 1 h after Ag provocation. The challenged animals subsequently developed airway inflammation, beginning with a neutrophilic infiltrate which was followed by lymphocytes and eosinophils. The Df-induced eosinophilia was Ag-specific and maximal at 48 h after challenge. At this time, the trachea from sensitized mice also exhibited hyperreactivity to carbachol. Pretreatment with anti-CD4+ mAb significantly decreased the recruitment of eosinophils in bronchoalveolar lavage fluids. An enhanced expression of pulmonary endothelial vascular cell adhesion molecule-1 was noted as early as 6 h after challenge. Anti-Df Abs of IgG class, but not IgE class, were detected in Df-immunized mice at the time of challenge. Furthermore, Df challenge induced a stronger eosinophil response in BALB/c mice (H-2d) than in B10.BR (H-2k) mice. B10.BR mice also did not exhibit pulmonary edema or ETH of ear swelling 1 h after challenge. These data suggest that an ETH-associated 1 h pulmonary edematous change was induced by intranasal challenge of Df in Df-sensitized mice, and that the ETH might contribute to the development of subsequent pulmonary inflammation and eosinophilia.

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