Abstract
Zinc oxide nanoparticle is one of the nanomaterials people engaged most in their life and its health effect has been taken into concern. In this work, A549 cell line was used as cell model, and the cytotoxicity of zinc oxide nanoparticles was revealed to be concentration-dependent. Through the measurement of cellular proteome, much more differentially expressed proteins were observed after the cells being treated for 9 h than 24 h. Also, most of these proteins expressed in the pattern which showed a significant decrease after exposure to zinc oxide nanoparticles and then an increase at 24 h. Intracellular reactive oxygen species and glutathione determination indicated that high level of oxidative stress was presented in cell after treatment with zinc oxide nanoparticles for 9 h. It can be observed from western blot analysis that the expression of NF-κB p65, PNPase, and HSP90 rose significantly after 9 h of exposure. Thus, a deduction was reached that toxicity of nanoparticles consists both of particle toxicity and ion toxicity, and a long-time treatment may conceal the toxicity induced by particles. The conclusion we made highlighted the importance of exposure time in the study of nanoparticle toxicity and would provide a new perspective for studying toxicity mechanism of nanoparticles.
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Funding
This work was supported by the National Natural Science Foundation of China (91643105, 21577057, 91543129, 81072712, and 90913012), the Natural Science Foundation of Jiangsu Province (BK20171335), and the National Basic Research Program of China (973 program, 2011CB911003). We thank Mr. LY Huang for assistance in the ICP-MS determination of zinc.
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Zhang, Zj., Tang, Zj., Zhu, Zy. et al. The time-dependent cellular response mechanism upon exposure to zinc oxide nanoparticles. J Nanopart Res 20, 263 (2018). https://doi.org/10.1007/s11051-018-4333-0
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DOI: https://doi.org/10.1007/s11051-018-4333-0