Airway fibrosis in rats induced by vanadium pentoxide.

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Abstract
Vanadium pentoxide (V2O5) is a cause of occupational asthma and bronchitis. We previously reported that intratracheal instillation of rats with V2O5causes fibrosis of the lung parenchyma (J. C. Bonner, P. M. Lindroos, A. B. Rice, C. R. Moomaw, and D. L. Morgan. Am. J. Physiol. Lung Cell. Mol. Physiol. 274: L72–L80, 1998). In this report, we show that intratracheal instillation of V2O5induces airway remodeling similar to that observed in individuals with asthma. These changes include airway smooth muscle cell thickening, mucous cell metaplasia, and airway fibrosis. The transient appearance of peribronchiolar myofibroblasts, which were desmin and vimentin positive, coincided with a twofold increase in the thickness of the airway smooth muscle layer at day 6after instillation and preceded the development of airway fibrosis by day 15. The number of nuclear profiles within the smooth muscle layer also increased twofold after V2O5instillation, suggesting that hyperplasia accounted for thickening of the smooth muscle layer. The majority of cells incorporating bromodeoxyuridine at day 3 were located in the connective tissue surrounding the airway smooth muscle wall that was positive for vimentin and desmin. These data suggest that myofibroblasts are the principal proliferating cell type that contributes to the progression of airway fibrosis after V2O5injury.