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Cytotoxicity of Dichloromethane Extracts of Asian Dust
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 Title & Authors
Cytotoxicity of Dichloromethane Extracts of Asian Dust
Park, Eun-Jung; Kim, Dae-Seon; Yu, Seong-Do; Park, Kwang-Sik;
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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.
Asian Dust;PAHs;inflammation;BEAS-2B;RAW264.7;
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