Unknown,Transcriptomics,Genomics,Proteomics

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Expression data from mouse liver tissue from SKH:QS mice treated with 68ZnO sunscreens

ABSTRACT: ZnO nanoparticles can elicit a range of perturbed cell responses in vitro. Exposure to topically applied sunscreens containing ZnO particles may or may not elicit a biological effect in mice. We aimed to determine whether exposure to topically applied ZnO particles manufactured as either microparticles or nanoparticles could elicit a biological response in liver tissue isolated from treated mice, compared to the sunscreen formulation only or untreated mice. Sunscreens containing 68ZnO microparticles, 68ZnO nanoparticles or no metal oxide particles at all (formulation only) were applied to the backs of SKH:QS mice six times over four days. On the fifth day mice were sacrificed and liver tissue was harvested for RNA isolation and whole genome transcriptional profiling, comparing the expression profiles of treated mice with untreated mice. Two separate experiments were conducted, one using virgin mice and the other using pregnant mice (~17d gestation)

ORGANISM(S): Mus musculus

SUBMITTER: Megan Osmond-McLeod

PROVIDER: E-GEOD-46568 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:A comprehensive in vitro assessment of two commercial metal oxide nanoparticles, TiO2 and ZnO, was performed using human monocyte-derived macrophages (HMDM), monocyte-derived dendritic cells (MDDC), and T cell leukemia-derived cell line (Jurkat). TiO2 nanoparticles were found to be non-toxic whereas ZnO nanoparticles caused dose-dependent cell death. Subsequently, global gene expression profiling was performed to identify signaling pathways underlying the cytotoxicity caused by ZnO nanoparticles. Analysis was done with doses, 1ug/ml and 10ug/ml after 6 and 24 hours of exposure. Interestingly, 2703 genes were significantly differentially expressed in HMDM upon exposure to 10ug/ml ZnO nanoparticles, while in MDDCs only 12 genes were affected. In Jurkat cells, 980 genes were differentially expressed. It is noteworthy that the gene expression of metallothioneins was upregulated in all the three cell types. In addition to the common ZnO-inducible changes, a notable proportion of the genes were regulated in a cell type-specific manner. Using a panel of ZnO nanoparticles, we obtained an additional support that the cellular response to ZnO nanoparticles is caused by particle dissolution. Gene ontology analysis revealed that the top biological processes disturbed in HMDM and Jurkat cells were regulating cell death and growth. In addition, genes controlling immune system development were affected. Bioinformatics assessment showed that the top human disease category associated with ZnO-responsive genes in both HMDM and Jurkat cells was cancer. Overall, the study revealed novel genes and pathways for mediating ZnO nanoparticle-induced toxicity and demonstrated the value of assessing nanoparticle responses through combined transcriptomics and bioinformatics approach. Nanoparticles used in the study: ZnO-1 commercial (IBU-tec advanced materials AG), ZnO-2 (mandelic acid coated ZnO-1), ZnO-3 (mercaptopropyl-trimethoxysilane coated ZnO-1), ZnO-4 (methoxyl coated ZnO), ZnO-5 (diethylene glycol modified ZnO) and ZnO-9 (folic acid modified ZnO). Detailed particle production and characterization data can be found from the articles: Buerki-Thurnherr et al. 2012 Nanotoxicology and Tuomela et al.

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Expression data from mouse liver tissue from SKH:QS mice treated with 68ZnO sunscreens

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