Bernstein D.M., Rogers R.A., Sepulveda R., Kunzendorf P., Bellmann B., Ernst H., Creutzenberg O., Phillips J.I.
Geneva, Switzerland; Rogers Imaging, Needham, MA, United States; GSA Gesellschaft für Schadstoffanalytik mbH, Ratingen, Germany; Fraunhofer Institute for Toxicology and Experimental Medicine, Hannover, Germany; National Institute for Occupational Health, National Health Laboratory Service, Johannesburg South Africa and Department of Biomedical Technology, Faculty of Health Sciences, University of Johannesburg, Johannesburg, South Africa
Bernstein, D.M., Geneva, Switzerland; Rogers, R.A., Rogers Imaging, Needham, MA, United States; Sepulveda, R., Rogers Imaging, Needham, MA, United States; Kunzendorf, P., GSA Gesellschaft für Schadstoffanalytik mbH, Ratingen, Germany; Bellmann, B., Fraunhofer Institute for Toxicology and Experimental Medicine, Hannover, Germany; Ernst, H., Fraunhofer Institute for Toxicology and Experimental Medicine, Hannover, Germany; Creutzenberg, O., Fraunhofer Institute for Toxicology and Experimental Medicine, Hannover, Germany; Phillips, J.I., National Institute for Occupational Health, National Health Laboratory Service, Johannesburg South Africa and Department of Biomedical Technology, Faculty of Health Sciences, University of Johannesburg, Johannesburg, South Africa
This study was designed to provide an understanding of the biokinetics and potential toxicology in the lung and pleura following inhalation of brake dust following short term exposure in rats. The deposition, translocation and pathological response of brake-dust derived from brake pads manufactured with chrysotile were evaluated in comparison to the amphibole, crocidolite asbestos. Rats were exposed by inhalation 6. h/day for 5. days to either brake-dust obtained by sanding of brake-drums manufactured with chrysotile, a mixture of chrysotile and the brake-dust or crocidolite asbestos. The chrysotile fibers were relatively biosoluble whereas the crocidolite asbestos fibers persisted through the life-time of the animal. This was reflected in the lung and the pleura where no significant pathological response was observed at any time point in the brake dust or chrysotile/brake dust exposure groups through 365. days post exposure. In contrast, crocidolite asbestos produced a rapid inflammatory response in the lung parenchyma and the pleura, inducing a significant increase in fibrotic response in both of these compartments. Crocidolite fibers were observed embedded in the diaphragm with activated mesothelial cells immediately after cessation of exposure. While no chrysotile fibers were found in the mediastinal lymph nodes, crocidolite fibers of up to 35. μm were observed. These results provide support that brake-dust derived from chrysotile containing brake drums would not initiate a pathological response in the lung or the pleural cavity following short term inhalation. © 2015 .
chrysotile; crocidolite; chrysotile; crocidolite; dust; animal experiment; animal tissue; Article; controlled study; diaphragm; dust exposure; inhalation; kinetics; lung; mediastinum lymph node; mesothelium cell; nonhuman; pleura; rat; scanning electron microscopy; analysis; animal; car; drug effects; dust; fibrosis; inhalational drug administration; lung; lymph node; male; metabolism; pathology; pleura; toxicity; Wistar rat; Animalia; Rattus; Administration, Inhalation; Animals; Asbestos, Crocidolite; Asbestos, Serpentine; Automobiles; Diaphragm; Dust; Fibrosis; Lung; Lymph Nodes; Male; Pleura; Rats, Wistar