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Analysis of the Ambient Particulate Matter-induced Chromosomal Aberrations Using an In Vitro System
Published on: December 21, 2016
Diffusion flame-derived fine particulate matters doped with iron caused genotoxicity in B6C3F1 mice
Jin Hong Park1, Kyu Tae Han, Kook-Jong Eu
1Laboratory of Toxicology, College of Veterinary Medicine, College of Agricultural Biotechnology, Seoul National University, Seoul, Korea.
Abstract:
Potential genotoxic effects of diffusion flame-derived particulate matters (PMs), known to cause various adverse health problems, doped with iron, one of the representative heavy metals frequently found in the atmosphere, were examined. B6C3F1 mice were exposed to PMs [chamber 1 (low), 100; chamber 2 (middle), 200; and chamber 3 (high), 400 microg/m3] for 6 h/day, 5 days/week for one, two and four weeks in 1.5 m3 whole-body inhalation chambers. Our diffusion flame system produced 94.8 and 5.2% fine PM2.5 and PM10, respectively, with 89% of PM2.5 sized between 0.1 and 0.2 microm. Two cytogenetic endpoints were investigated through chromosomal aberration and supravital micronucleus (SMN) assays. Frequencies of cells with chromosome aberration (%) were observed in time- and concentration-dependent manners except in one-week exposure group, as also observed in SMN study. Generally, noniron flame induced less chromosome aberration than iron-doped flame, an indication that iron particles could potentiate urban PM toxicity. The above results indicate our diffusion flame system generated genotoxic fine PMs, whose effects were potentiated by organometallic particles such as iron. Our system can provide reliable PM models for studying the toxicity of urban fine PMs applicable for risk assessment.
Insights
Iron-doped particulate matter (PM) exposure in mice showed potential genotoxic effects, increasing with concentration and duration. Iron particles potentiated the toxicity of fine PM2.5, highlighting risks from urban air pollution.
Area of Science:
- Environmental Health
- Toxicology
- Genetics
Background:
- Particulate matters (PMs) from diffusion flames are linked to adverse health effects.
- Iron is a common atmospheric heavy metal pollutant.
- Understanding the genotoxicity of PMs is crucial for risk assessment.
Purpose of the Study:
- To investigate the potential genotoxic effects of iron-doped diffusion flame-derived PMs.
- To assess the influence of iron on the toxicity of fine PM2.5.
- To establish a reliable model for studying urban PM toxicity.
Main Methods:
- B6C3F1 mice were exposed to varying concentrations of PMs (100-400 microg/m3) for up to four weeks.
- Chromosomal aberration and supravital micronucleus (SMN) assays were used to evaluate genotoxicity.
- A diffusion flame system generated PMs, characterized for size distribution (94.8% PM2.5).
Main Results:
- Genotoxic effects, including chromosomal aberrations and SMN, were observed in a time- and concentration-dependent manner.
- Iron-doped PMs induced significantly more chromosomal aberrations than non-iron PMs.
- Fine PM2.5 particles, particularly those between 0.1-0.2 microm, were found to be genotoxic.
Conclusions:
- Diffusion flame-generated PMs, especially when doped with iron, exhibit genotoxic potential.
- Iron particles can potentiate the toxicity of urban fine PMs.
- The developed diffusion flame system provides a reliable model for assessing the health risks of urban fine PMs.
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