Elastic-Collagen Profile in Emphysematous Airspaces from Different Chronic Fibrosing Lung Disorders
Lia J Marcal, Leila Antonangelo, Edwin R Parra, Francisco S Vargas, Walcy R Teodoro, Ellen CT Nascimento, Vera L Capelozzi. University of Sao Paulo Medical School, São Paulo, Brazil
Background: Parenchyma elastic and collagen components of chronic fibrosing lung disorders has been exhaustively investigated, but little attention has been aimed at the emphysematous airspaces present in bullous disease, smoking-related interstitial disease and usual interstitial pneumonia. The aim of this study was to evaluate whether elastic deposition accompanies collagen deposition in the repairing process of emphysematous airspaces in chronic fibrosing lung injuries.
Design: The elastic and collagen fibers distribution were evaluated in emphysematous airspaces of bullous type I and II disease, smoking-related interstitial fibrosis and of usual interstitial pneumonia (UIP). Lung specimens obtained by surgical lung biopsy or by bullectomy divided the patients into four groups: 1) type I bullous disease (SPT-I; n=7); 2) type II bullous disease (SPT-II; n=12); 3) smoking-related interstitial pneumonia (SRIP; n=5) and 4) usual interstitial pneumonia/idiopathic pulmonary fibrosis (UIP/IPF; n=5). Collagen and elastic fibers were identified respectively by Picrosirius-polarization and Weigert's resorcin-fucsin staining and quantified by image analysis.The results were expressed in percentual area.
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