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Distribution of transforming growth factor-beta 1, fibronectin, and smooth muscle actin in asbestos-induced pulmonary fibrosis in rats
TD Perdue and AR Brody
Laboratory of Pulmonary Pathobiology, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina.
We are studying the development of fibrogenic lesions in the lungs of rats exposed briefly to an aerosol of chrysotile asbestos fibers. This model of asbestosis has enabled us to establish very early cellular events at the specific locations where interstitial fibrosis will develop. These sites, the first alveolar duct bifurcations, are where the fibers are initially deposited and where macrophages first accumulate. In the studies presented here, we used immunohistochemical techniques to show that these macrophages exhibit strong localization of transforming growth factor-beta. In the adjacent developing fibrogenic lesions a clear increase in fibronectin staining was demonstrated and morphological analysis indicated a significant increase in amounts of smooth muscle actin. Such studies are essential in furthering our understanding of the distribution of potential mediators of the fibrogenic process and the cellular responses they elicit during the pathogenesis of disease.
Volume 42,
Issue 8,
pp. 1061-1070,
08/01/1994
Copyright © 1994 by The Histochemical Society
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