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Crocidolite-induced reactive oxygen metabolites generation from human polymorphonuclear leukocytes
1Department of Public Health, Teikyo University School of Medicine, Tokyo, Japan.
Environmental Research
|August 1, 1994
Summary
Crocidolite asbestos exposure induces reactive oxygen metabolites (ROM) in human white blood cells. Hydroxyl radical (OH.) is identified as a key species in crocidolite-induced carcinogenesis.
Area of Science:
- Toxicology
- Cell Biology
- Biochemistry
Background:
- Crocidolite asbestos is a known carcinogen.
- The precise mechanisms of asbestos-induced carcinogenicity are not fully understood.
- Reactive oxygen metabolites (ROM) are implicated in cellular damage and disease.
Purpose of the Study:
- To investigate the species of ROM induced by crocidolite asbestos.
- To elucidate the role of these ROM in the carcinogenicity of crocidolite.
- To understand the interaction between crocidolite and human polymorphonuclear leukocytes (PMN).
Main Methods:
- Utilized electron spin resonance (ESR) with DMPO spin trapping.
- Employed luminol-dependent chemiluminescence (CL) assays.
- Investigated the effects of ROM scavengers (superoxide dismutase, catalase, DMSO) and MPO inhibitor (sodium azide).
Main Results:
- Confirmed the generation of hydroxyl radical (OH.) from PMN stimulated by crocidolite using ESR.
- Observed a dose-dependent increase in chemiluminescence (CL) intensity with crocidolite exposure.
- Demonstrated that scavengers of superoxide (O2-), hydrogen peroxide (H2O2), and OH., as well as MPO inhibition, reduced CL production.
Conclusions:
- The study suggests the involvement of O2-, H2O2, OH., and OCl- in crocidolite-stimulated CL production by PMN.
- Hydroxyl radical (OH.) is proposed as a key ROM species in the mechanism of crocidolite-induced carcinogenesis.