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Molecular Responses of Human Lung Epithelial Cells to the Toxicity of Copper Oxide Nanoparticles Inferred from Whole Genome Expression Analysis

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Hanagata, Nobutaka, Zhuang, Fei, Connolly, Sarah, Li, Jie, Ogawa, Nobuhiro, Xu, Mingsheng·2011·ACS Nano
DOI 10.1021/nn202966t
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Abstract

This study proposes a molecular mechanism for lung epithelial A549 cell response to copper oxide nanoparticles (CuO-NPs) related to Cu ions released from CuO-NPs. Cells that survived exposure to CuO-NPs arrested the cell cycle as a result of the downregulation of proliferating cell nuclear antigen (PCNA), cell division control 2 (CDC2), cyclin B1 (CCNB1), target protein for Xklp2 (TPX2), and aurora kinase A (AURKA) and B (AURKB). Furthermore, cell death was avoided through the induced expression of nuclear receptors NR4A1 and NR4A3 and growth arrest and DNA damage-inducible 45 β and γ (GADD45B and GADD45G, respectively). The downregulation of CDC2, CCNB1, TPX2, AURKA, and AURKB, the expressions of which are involved in cell cycle arrest, was attributed to Cu ions released from CuO-NPs into medium. NR4A1 and NR4A3 expression was also induced by Cu ions released into the medium. The expression of GADD45B and GADD45G activated the p38 pathway that was involved in escape from cell death. The upregulation of GADD45B and GADD45G was not observed with Cu ions released into medium but was observed in cells exposed to CuO-NPs. However, because the expression of the genes was also induced by Cu ion concentrations higher than that released from CuO-NPs into the medium, the expression appeared to be triggered by Cu ions released from CuO-NPs taken up into cells. We infer that, for cells exposed to CuO-NPs, those able to make such a molecular response survived and those unable to do so eventually died.

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Citations

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Cited by

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Metadata

Authors
Hanagata, N., Zhuang, F., Connolly, S., Li, J., Ogawa, N., & Xu, M.
Venue
ACS Nano
Publisher
American Chemical Society (ACS)
Published
2011-11-18
Volume
5
Issue
12
Pages
9326-9338
ISSN
  • 1936-0851 (ISSN-L)
  • 1936-086X
DOI
10.1021/nn202966t
OpenAlex
W2104086585
Cited by
175
References
4
FWCI
4.80
Type
journal article
Language
en
Open access
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