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Experimental research into the pathogenesis of cobalt/hard metal lung disease

D Lison, R Lauwerys, M Demedts, B Nemery
European Respiratory Journal 1996 9: 1024-1028; DOI: 10.1183/09031936.96.09051024
D Lison
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R Lauwerys
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M Demedts
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B Nemery
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Abstract

In recent years clinical, epidemiological and experimental evidence has accumulated indicating that cobalt metal particles, when inhaled in association with other agents such as metallic carbides (hard metals) or diamond dust, may produce an interstitial lung disease termed "hard metal disease" or "cobalt lung". This article summarizes the progress accomplished in our two laboratories to understand the pathogenesis of this disease. Gaps and weaknesses in our current knowledge have also been highlighted in order to suggest potential avenues for further research. Whilst animal models have proved useful for the demonstration of the toxic synergy between cobalt and carbides (e.g. tungsten carbide), most animal models have remained descriptive and have not provided information on the mechanism for this synergy. In particular, the bizarre multinucleated giant cells which are an important hallmark of the human disease, have not been reproduced consistently in experimental animals. Since cobalt is a known sensitizer, there may also be a need to develop experimental models to test the possible involvement of immunological mechanisms in the pathogenesis of the interstitial disease. In vitro systems including macrophage cell cultures and physico-chemical tests have been useful to investigate the mechanism underlying the toxic synergy. The recent finding that, in vitro, cobalt and metallic carbides interact with oxygen to produce toxic activated oxygen species opens a new avenue of research and may offer an alternative interpretation of the fact that only a limited proportion of exposed workers develop interstitial disease. Besides the possible involvement of immunological mechanisms, it may be speculated that individuals with a lower antioxidant defence are more susceptible to the toxic effect of activated oxygen species produced by cobalt-containing dusts from hard metal.

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Experimental research into the pathogenesis of cobalt/hard metal lung disease
D Lison, R Lauwerys, M Demedts, B Nemery
European Respiratory Journal May 1996, 9 (5) 1024-1028; DOI: 10.1183/09031936.96.09051024

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Experimental research into the pathogenesis of cobalt/hard metal lung disease
D Lison, R Lauwerys, M Demedts, B Nemery
European Respiratory Journal May 1996, 9 (5) 1024-1028; DOI: 10.1183/09031936.96.09051024
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