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Abstract

In this study using guinea pigs, we investigated the effects of diesel exhaust (DE) containing diesel exhaust particulate (DEP) on 1) vascular permeability induced by histamine, 2) nasal mucosal permeability to horseradish peroxidase (HRP), and 3) eosinophilic epithelial infiltration. The vascular permeability induced by histamine was enhanced significantly and dose-dependently in DE-exposed guinea pigs. The HRP reaction products in epithelial cells and intercellular spaces were significantly and dose-dependently increased in those guinea pigs. Eosinophil infiltration into the epithelial layer was significantly increased in guinea pigs exposed to DE containing 3.2 mg/m³ DEP, and the reactivity of the nasal mucosa to histamine solution applied on the nasal mucosa was significantly enhanced in those guinea pigs. These findings suggest that DE may play an important role not only in promoting nasal hyperreactivity induced by the enhancement of absorption of antigen through the nasal epithelium, but also in inducing eosinophil infiltration in nasal mucosa and enhancing nasal mucosal reactivity.

Keywords

diesel exhaust diesel exhaust particulate eosinophil infiltration epithelial permeability horseradish peroxidase

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Effect of Diesel Exhaust on Guinea Pig Nasal Mucosa

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