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http://dx.doi.org/10.5352/JLS.2022.32.4.310

The Induction of ROS-dependent Autophagy by Particulate Matter 2.5 and Hydrogen Peroxide in Human Lung Epithelial A549 Cells  

Park, Beom Su (Anti-Aging Research Center, Dong-eui University)
Kim, Da Hye (Anti-Aging Research Center, Dong-eui University)
Hwangbo, Hyun (Anti-Aging Research Center, Dong-eui University)
Lee, Hyesook (Department of Convergence Medicine, Pusan National University School of Medicine)
Hong, Su Hyun (Anti-Aging Research Center, Dong-eui University)
Cheong, Jaehun (Department of Molecular Biology, Pusan National University)
Choi, Yung Hyun (Anti-Aging Research Center, Dong-eui University)
Publication Information
Journal of Life Science / v.32, no.4, 2022 , pp. 310-317 More about this Journal
Abstract
Recently, interest in the harmful factors of particulate matter (PM), a major component of air pollution, has been increasing. In particular, PM2.5 with a diameter of less than 2.5 ㎛ is well known to induce oxidative stress accompanied by autophagy in human lung epithelial cells. However, studies on whether PM2.5 increases autophagy under oxidative stress and whether this process is reactive oxygen species (ROS)-dependent are insufficient. Therefore, in this study, we investigated whether PM2.5 promotes autophagy through the generation of ROS in human alveolar epithelial A594 cells. According to our results, cells co-treated with PM2.5 and hydrogen peroxide (H2O2) showed a lower cell viability than cells treated with each alone, which was associated with increased total and mitochondrial ROS production. The co-treatment of PM2.5 and H2O2 also increased autophagy induction, which was confirmed through Cyto-ID staining, and the expression of autophagy biomarker proteins increased. However, when ROS generation was artificially blocked by N-acetyl-L-cysteine pretreatment, the reduction in cell viability and induction of autophagy by PM2.5 and H2O2 co-treatment were markedly attenuated. Therefore, the present results suggest that PM2.5-induced ROS generation may play a critical role in autophagy induction in A549 cells.
Keywords
Autophagy; lung epithelial cells; particulate matter 2.5; ROS;
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