Pleural macrophage recruitment and activation in asbestos-induced pleural injury

Autor:	Nonghoon Choe, David R. Hemenway, Elliott Kagan, Shogo Tanaka, Weijia Xia, Victor L. Roggli
Rok vydání:	1997
Předmět:	Male Pathology medicine.medical_specialty Health Toxicology and Mutagenesis medicine.medical_treatment Cell Count Nitric Oxide medicine.disease_cause Asbestos Nitric oxide Pleural disease chemistry.chemical_compound Chrysotile medicine Animals Particle Size Cells Cultured Inhalation Tumor Necrosis Factor-alpha Chemistry Macrophages Asbestos Crocidolite Public Health Environmental and Occupational Health Macrophage Activation medicine.disease Rats Inbred F344 Rats Cytokine Carcinogens Microscopy Electron Scanning Pleura Cytokine secretion Tumor necrosis factor alpha Research Article
Zdroj:	Environmental Health Perspectives
ISSN:	1552-9924 0091-6765
DOI:	10.1289/ehp.97105s51257
Popis:	The pathogenesis of asbestos-induced pleural fibrosis is poorly understood. Moreover, there has been a long-standing controversy regarding the relative potential of different commercial types of asbestos to cause pleural disease. We postulated that inhaled asbestos fibers translocate to the pleural space where they stimulate the recruitment and activation of pleural macrophages. To test this hypothesis, and to determine whether there are differences between inhaled amphibole and serpentine asbestos, Fischer 344 rats were exposed by intermittent inhalation (6 hr/day for 5 days/week over 2 weeks) to either National Institute of Environmental Health Sciences (NIEHS) crocidolite (average concentration 7.55 mg/m3) or NIEHS chrysotile fibers (average concentration 8.51 mg/m3). Comparisons were made with sham-exposed rats. The rats were sacrificed at 1 and 6 weeks after the cessation of exposure. More pleural macrophages were recovered at 1 and 6 weeks after crocidolite and chrysotile exposure than after sham exposure. Small numbers of crocidolite fibers (approximately 1 per 4000 cells) were detected in the pleural cell pellet of one crocidolite-exposed rat by scanning electron microscopy. Pleural macrophage supernatants were assayed for production of nitric oxide (NO) (by the Griess reaction) and tumor necrosis factor alpha (TNF-alpha) (by an enzyme-linked immunosorbent assay method). Significantly greater amounts of NO as well as TNF-alpha were generated by pleural macrophages at 1 and 6 weeks after either crocidolite or chrysotile inhalation than after sham exposure. Conceivably, translocation of asbestos fibers to the pleural space may provide a stimulus for persistent pleural space inflammation, cytokine production, and the generation of toxic oxygen and nitrogen radicals. Enhanced cytokine secretion within the pleural space may in turn upregulate adhesion molecule expression and the synthesis of extracellular matrix constituents by pleural mesothelial cells. Thus, our findings may have significance for the development of asbestos-induced pleural injury. Images Figure 1.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be8d097bca2de0ee71162983ce9b463b https://doi.org/10.1289/ehp.97105s51257 Zobrazit plný text záznamu Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.