期刊
TOXICOLOGY IN VITRO
卷 24, 期 1, 页码 45-55出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tiv.2009.09.007
关键词
Nanoparticles; ZnO; Oxidative stress; Calcium modulation; Cytotoxicity; Gene expression
类别
资金
- Department of Biological Sciences
- cDNA Resource Center of the Missouri University of Science and Technology
The influence of 20 nm ZnO nanoparticles on cytotoxicity, oxidative stress, intracellular calcium homeostasis, and gene expression was studied in human bronchial epithelial cells (BEAS-2B). ZnO caused a concentration- and time-dependent cytotoxicity while elevating oxidative stress and causing membrane damage (cellular LDH release). There was a remarkably steep relationship between concentration and toxicity at concentrations from 5 to 10 mu g/ml. Cytotoxicity was completely abolished by the antioxidant N-acetylcysteine (NAC). Exposure to ZnO also increased intracellular calcium levels ([Ca2+](in)) in a concentration- and time-dependent manner that was partially attenuated by NAC. Nifedipine, a calcium channel blocker, partially attenuated the elevated [Ca2+](in), indicating that some of the excess [Ca2+](in) is a result of influx from outside the cell. The relationships between oxidative stress, [Ca2+](in), and cytotoxicity are discussed. Exposure to a sublethal concentration of ZnO increased the expression of four genes that are involved in apoptosis and oxidative stress responses BNIP, PRDX3, PRNP, and TXRND1, by at least 2.5-fold. Thus, ZnO alters transcriptional regulation in BEAS-2B cells. (C) 2009 Elsevier Ltd. All rights reserved.
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