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- W95955415 abstract "The responses of alveolar and bronchial cells to asbestos exposure were studied to relate the cytokinetic changes of injury and repair to the inflammatory process and subsequent fibroblast activity. Lesions were induced by intratracheal instillation of 1 mg crocidolite asbestos to mice which were killed up to 20 weeks; /sup 3/H thymidine was injected 1 hr before death. A rapid inflammatory response with elevated PMN and lysosomal enzyme release was largely over by 2 wks though an increase in alveolar macrophages (AM) was maintained. Within 48 hrs there was multifocal necrosis of bronchiolar epithelium, maximal at bifurcations where longer fibers tend to adhere. Subsequently, intralumenal exudates were overgrown by proliferating epithelial cells and were incorporated, with long fibers, into bronchiolar connective tissue where granulomas formed. Alveolar lesions were located in peribronchiolar air sacs where focal injury of Type 1 cells by short fibers was rapidly repaired by division of Type 2 cells. Most short fibers were cleared by AMs, only a few fibers reached the interstitium. After 2 wks the increase in labeling index was due to labeled peribronchial fibroblasts. Biochemically, collagen increased after 4 wks when fibrosis was seen in bronchiolar lumens and in peribronchiolar connective tissue with lessermore » amounts in the centrilobular alveolar interstitium. The results suggest that long fibers induce bronchiolar injury and a more severe fibrotic pattern similar to human asbestosis.« less" @default.
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- W95955415 date "1986-03-05" @default.
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- W95955415 title "Crocidolite-induced pulmonary fibrosis in mice" @default.
- W95955415 hasPublicationYear "1986" @default.
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