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Am. J. Respir. Crit. Care Med., Volume 161, Number 2, February 2000, 627-635

Prolonged Allergen Exposure Induces Structural Airway Changes in Sensitized Rats

ELS PALMANS, JOHAN C. KIPS, and ROMAIN A. PAUWELS

Department of Respiratory Diseases, University Hospital Gent, Gent, Belgium

The pathogenesis and functional consequences of airway remodeling in asthma remain to be fully established. In the present study we evaluated the effect of prolonged allergen exposure on airway function and structure in rats. Sensitized Brown Norway rats were repeatedly exposed for periods of 2, 4, or 12 wk to aerosolized ovalbumin (OA) or phosphate-buffered saline (PBS). OA exposure induced a persistent increase in OA-specific serum IgE and in the number of peribronchial eosinophils. After 2 wk of OA exposure, airway histology revealed goblet-cell hyperplasia, an increase in bromodeoxyuridine-positive cells in airway epithelium, increased fibronectin deposition, and a thickening of the airway inner wall area. This coincided with airway hyperresponsiveness (AHR) to aerosolized carbachol. After OA exposure for 12 wk, increased fibronectin (p < 0.05 versus PBS) and collagen deposition (p < 0.05 versus PBS) were observed in the submucosa. After 12 wk of exposure, neither total nor inner wall area or airway responsiveness to carbachol were any longer significantly different from those of PBS-exposed animals. In conclusion, prolonged OA exposure in rats induces structural airway changes that bear similarities to airway remodeling in asthma. The study data further indicate that depending on the extent and distribution of remodeling, changes in the extracellular matrix can enhance or protect against AHR. Palmans E, Kips JC, Pauwels RA. Prolonged allergen exposure induces structural airway changes in sensitized rats.




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