Journal of Environmental Health Sciences (한국환경보건학회지)

Korean Society of Environmental Health (한국환경보건학회)
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Cytotoxicity of Dichloromethane Extracts of Asian Dust

  • Received : 2010.05.06
  • Accepted : 2010.08.05
  • Published : 2010.08.30
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Abstract

The appearance of Asian Dust (AD) originating from China and Mongolia during spring each year is a meteorological phenomenon periodically observed in extensive regions of East Asia. According to a previous epidemiological study, AD has adverse effects on both human beings and ecosystems. In this study, we collected total suspension particles (TSP) in the AD period and Non-AD (NAD) period. We extracted organic components from TSP using dichloromethane (DCM), and the polyaromatic hydrocarbons (PAHs) were analyzed. The DCM extracts contained PAHs such as benzo(b)fluoranthene, benzo[g,h,i]perylene, benzo(k)fluoranthene, benzo(a)pyrene, and pyrene. No significant difference was observed in cytotoxicity of the DCM extracts from AD versus NAD when tested on the human bronchial epithelial cells, BEAS-2B. e also examined the toxic mechanisms of AD extracts in cultured BEAS-2B cells and RAW264.7 cells, and in BEAS-2B cells observed increased levels of reactive oxygen species (ROS), decreased glutathione (GSH), and induced caspase-3 activity. Increased expression of oxidative stress-related and inflammation- related genes were also observed in BEAS-2B cells, while nitric oxide (NO) levels were increased in RAW264.7 cells. Taken together, the results suggest that in these cultured cells, AD may induce cytotoxicity through oxidative stress and pro-inflammatory signals.

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