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JOURNAL ARTICLE
REVIEW
Cytokines and cytokine network in silicosis and coal workers' pneumoconiosis.
European Respiratory Journal 1995 May
The alveolar macrophage (AM) is a critically important cell playing a prominent role in lung inflammation via the production of oxygen radicals, enzymes, arachidonic acid metabolites, and also a large panel of cytokines. Among interstitial lung disorders, silicosis and coal workers' pneumoconiosis (CWP) are the most widespread fibrotic lung diseases. Although their pathophysiology remains incompletely understood, several lines of evidence suggest the participation of cytokines produced by AMs at least in the initiation of the alveolitis. In vitro exposure of AMs (obtained from healthy subjects) to coal dust particles triggered a significant release of tumour necrosis factor (TNF) and interleukin-6, by comparison with titanium dioxide used as a biologically inert control dust. Moreover, it appeared that coal mine dust was more aggressive than similar concentrations of pure silica, suggesting that cytokine secretion induced by coal mine dust was not exclusively related to the presence of silica but resulted from a complex interaction between the different components. In silicosis and CWP, bronchoalveolar lavage showed a large influx of mononuclear phagocytes, with an increased spontaneous production of oxidants, fibronectin, neutrophil chemotactic factor, and also of interleukin-6 and TNF-alpha. This spontaneous cytokine release was associated with an increased cytokine messenger ribonucleic acid (mRNA) expression in the lungs of coal miners.(ABSTRACT TRUNCATED AT 250 WORDS)
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