It has been demonstrated that hard metal dust, which consists of a mixture of cobalt and tungsten carbide, is more toxic toward mouse peritoneal and rat alveolar macrophages than pure cobalt (Co) or tungsten carbide (WC).
The aim of this study was to investigate the toxic effects of Co and hard metal dust on alveolar epithelial type II cells (AT-II), and to compare these with alveolar macrophages.
Freshly isolated rat and human AT-II and rat alveolar macrophages were exposed for 18 hr to particles of Co, WC or Co/WC.
As an index for cell toxicity, release of lactate dehydrogenase was measured.
For rat AT-II, TD50 values per 105 cells were 672 mug (95% C.I.=264-1706 mug) for pure Co and 101 mug (95% C.I.=59-172 mug) for Co in Co/WC mixture.
For rat alveolar macrophages, TD50 values per 105 cells were 18 mug (95% C.I.=15-24 mug) for pure Co and 5 mug (95% C.I.=5-6 mug) for Co in Co/WC mixture.
WC only caused an increase in lactate dehydrogenase at high concentrations.
No toxicity was found in human AT-II for either Co, WC or Co/WC.
These results indicate that I) rat AT-II are less sensitive to Co than rat alveolar macrophages, 2) human AT-II are less sensitive to Co than rat AT-II, 3) the toxicity of Co is increased by the presence of WC.
Mots-clés Pascal : Cobalt, Poussière atmosphérique, Exposition professionnelle, Pneumoconiose, Pneumocyte, Macrophage, Cellule alvéolaire type II, Toxicité, Homme, Animal, Rat, Rodentia, Mammalia, Vertebrata, Souris, In vitro, Mélange, Comparaison interspécifique, Médecine travail, Appareil respiratoire pathologie, Poumon pathologie
Mots-clés Pascal anglais : Cobalt, Atmospheric dust, Occupational exposure, Pneumoconiosis, Pneumocyte, Macrophage, Alveolar type II cell, Toxicity, Human, Animal, Rat, Rodentia, Mammalia, Vertebrata, Mouse, In vitro, Mixture, Interspecific comparison, Occupational medicine, Respiratory disease, Lung disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0452794
Code Inist : 002B03L03. Création : 03/02/1998.