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@article{Limonciel:2018:10.3389/fgene.2018.00558,
author = {Limonciel, A and van, Breda SG and Jiang, X and Tredwell, GD and Wilmes, A and Aschauer, L and Siskos, AP and Sachinidis, A and Keun, HC and Kopp-Schneider, A and de, Kok TM and Kleinjans, JCS and Jennings, P},
doi = {10.3389/fgene.2018.00558},
journal = {Frontiers in Genetics},
title = {Persistence of epigenomic effects after recovery from repeated treatment with two nephrocarcinogens},
url = {http://dx.doi.org/10.3389/fgene.2018.00558},
volume = {9},
year = {2018}
}

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TY  - JOUR
AB  - The discovery of the epigenetic regulation of transcription has provided a new source of mechanistic understanding to long lasting effects of chemicals. However, this information is still seldom exploited in a toxicological context and studies of chemical effect after washout remain rare. Here we studied the effects of two nephrocarcinogens on the human proximal tubule cell line RPTEC/TERT1 using high-content mRNA microarrays coupled with miRNA, histone acetylation (HA) and DNA methylation (DM) arrays and metabolomics during a 5-day repeat-dose exposure and 3 days after washout. The mycotoxin ochratoxin A (OTA) was chosen as a model compound for its known impact on HA and DM. The foremost effect observed was the modulation of thousands of mRNAs and histones by OTA during and after exposure. In comparison, the oxidant potassium bromate (KBrO3) had a milder impact on gene expression and epigenetics. However, there was no strong correlation between epigenetic modifications and mRNA changes with OTA while with KBrO3 the gene expression data correlated better with HA for both up- and down-regulated genes. Even when focusing on the genes with persistent epigenetic modifications after washout, only half were coupled to matching changes in gene expression induced by OTA, suggesting that while OTA causes a major effect on the two epigenetic mechanisms studied, these alone cannot explain its impact on gene expression. Mechanistic analysis confirmed the known activation of Nrf2 and p53 by KBrO3, while OTA inhibited most of the same genes, and genes involved in the unfolded protein response. A few miRNAs could be linked to these effects of OTA, albeit without clear contribution of epigenetics to the modulation of the pathways at large. Metabolomics revealed disturbances in amino acid balance, energy catabolism, nucleotide metabolism and polyamine metabolism with both chemicals. In conclusion, the large impact of OTA on transcription was confirmed at the mRNA level but also with
AU  - Limonciel,A
AU  - van,Breda SG
AU  - Jiang,X
AU  - Tredwell,GD
AU  - Wilmes,A
AU  - Aschauer,L
AU  - Siskos,AP
AU  - Sachinidis,A
AU  - Keun,HC
AU  - Kopp-Schneider,A
AU  - de,Kok TM
AU  - Kleinjans,JCS
AU  - Jennings,P
DO  - 10.3389/fgene.2018.00558
PY  - 2018///
SN  - 1664-8021
TI  - Persistence of epigenomic effects after recovery from repeated treatment with two nephrocarcinogens
T2  - Frontiers in Genetics
UR  - http://dx.doi.org/10.3389/fgene.2018.00558
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000452098600001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/69362
VL  - 9
ER  -

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