期刊
TOXICOLOGY REPORTS
卷 3, 期 -, 页码 832-840出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.toxrep.2016.10.009
关键词
Silica nanoparticles; Endoplasmic reticulum stress; MAPK; TNE-alpha; Huh7 cells
类别
Humans may be exposed to engineered silica nanoparticles (SiO2-NPs) but potential adverse effects are poorly understood, in particular in relation to cellular effects and modes of action. Here we studied effects of SiO2-NPs on cellular function in human hepatoma cells (Huh7). Exposure for 24 h to 10 and 50 mu g/m1 SiO2-NPs led to induction of endoplasmic reticulum (ER) stress as demonstrated by transcriptional induction of DNAJB9, GADD34, CHOP, as well as CHOP target genes BIM, CHAC-1, NOXA and PUMA. In addition, CHOP protein was induced. In addition, SiO2-NPs induced an inflammatory response as demonstrated by induction of TNF-ce. and IL-8. Activation of MAPK signalling was investigated employing a PCR array upon exposure of Huh7 cells to SiO2-NPs. Five of 84 analysed genes, including P21, P19, CFOS, CJUN and KSR1 exhibited significant transcriptional up-regulation, and 18 genes a significant down-regulation. Strongest down-regulation occurred for the proto-oncogene BRAF, MAPK11, one of the four p38 MAPK genes, and for NFATC4. Strong induction of CFOS, CJUN, FRA1 and CMYC was found after exposure to 50 mu g/m1 SiO(2)NPs for 24 h. To analyse for effects derived from up-regulation of TNF-alpha, Huh7 cells were exposed to SiO2-NPs in the presence of the TNF-alpha inhibitor sauchinone, which reduced the induction of the TNF-alpha transcript by about 50%. These data demonstrate that SiO2-NPs induce ER stress, MAPK pathway and lead to inflammatory reaction in human hepatoma cells. Health implications of SiO2-NPs exposure should further be investigated for a risk assessment of these frequently used nanoparticles. (C) 2016 The Author(s). Published by Elsevier Ireland Ltd.
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