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http://dx.doi.org/10.5012/bkcs.2011.32.6.2051

Evaluation of Toxicity and Gene Expression Changes Triggered by Oxide Nanoparticles  

Dua, Pooja (Global Research Laboratory for RNAi Medicine, Department of Chemistry and BK21 School of Chemical Materials Science, Sungkyunkwan University)
Chaudhari, Kiran N. (Department of Advanced Materials Chemistry, BK21 Research Team, Korea University)
Lee, Chang-Han (Global Research Laboratory for RNAi Medicine, Department of Chemistry and BK21 School of Chemical Materials Science, Sungkyunkwan University)
Chaudhari, Nitin K. (Department of Advanced Materials Chemistry, BK21 Research Team, Korea University)
Hong, Sun-Woo (Global Research Laboratory for RNAi Medicine, Department of Chemistry and BK21 School of Chemical Materials Science, Sungkyunkwan University)
Yu, Jong-Sung (Department of Advanced Materials Chemistry, BK21 Research Team, Korea University)
Kim, So-Youn (Department of Biomedical Engineering, Dongguk University)
Lee, Dong-Ki (Global Research Laboratory for RNAi Medicine, Department of Chemistry and BK21 School of Chemical Materials Science, Sungkyunkwan University)
Publication Information
Abstract
Several studies have demonstrated that nanoparticles (NPs) have toxic effects on cultured cell lines, yet there are no clear data describing the overall molecular changes induced by NPs currently in use for human applications. In this study, the in vitro cytotoxicity of three oxide NPs of around 100 nm size, namely, mesoporous silica (MCM-41), iron oxide ($Fe_2O_3$-NPs), and zinc oxide (ZnO-NPs), was evaluated in the human embryonic kidney cell line HEK293. Cell viability assays demonstrated that 100 ${\mu}g/mL$ MCM-41, 100 ${\mu}g/mL$ $Fe_2O_3$, and 12.5 ${\mu}g/mL$ ZnO exhibited 20% reductions in HEK293 cell viability in 24 hrs. DNA microarray analysis was performed on cells treated with these oxide NPs and further validated by real time PCR to understand cytotoxic changes occurring at the molecular level. Microarray analysis of NP-treated cells identified a number of up- and down-regulated genes that were found to be associated with inflammation, stress, and the cell death and defense response. At both the cellular and molecular levels, the toxicity was observed in the following order: ZnO-NPs > $Fe_2O_3$-NPs > MCM-41. In conclusion, our study provides important information regarding the toxicity of these three commonly used oxide NPs, which should be useful in future biomedical applications of these nanoparticles.
Keywords
MCM-41; $Fe_2O_3$ nanoparticle; ZnO nanoparticle; HEK293; Microarray;
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