Abstract
Asbestos is an important occupational and environmental toxicant that affects several cell types in the respiratory tract. In an effort to understand how asbestos causes cell injury and/or altered proliferation and differentiation of cells, this laboratory has focused on reactive oxygen species as mediators of asbestos-induced biological effects. A compendium of experimental results reported by this laboratory and others supports this hypothesis. For example, scavengers of reactive oxygen metabolites and iron chelators (i.e., desferroxamine) prevent cytotoxicity after addition of asbestos to a variety of cell lines and macrophages in vitro. DNA strand breakage associated with toxicity of crocidolite asbestos in C3H10T 1/2 cells also is ameliorated with use of desferroxamine. All types of asbestos cause lipid peroxidation in mammalian cells and artificial membranes, a phenomenon that can be prevented by removal of catalytic iron. Last, asbestos causes generation of active oxygen species after interaction with leukocytes or by reduction of oxygen on the surface of the fibers.
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