Universität zu Köln

Limonciel, Alice ORCID: 0000-0001-6588-5944, van Breda, Simone G., Jiang, Xiaoqi, Tredwell, Gregory D., Wilmes, Anja ORCID: 0000-0001-9485-4565, Aschauer, Lydia, Siskos, Alexandros P., Sachinidis, Agapios, Keun, Hector C., Kopp-Schneider, Annette, de Kok, Theo M., Kleinjans, Jos C. S. and Jennings, Paul ORCID: 0000-0002-6860-2898 (2018). Persistence of Epigenomic Effects After Recovery From Repeated Treatment With Two Nephrocarcinogens. Front. Genet., 9. LAUSANNE: FRONTIERS MEDIA SA. ISSN 1664-8021

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Abstract

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 two high-content epigenomic methodologies. Transcriptomic data confirmed the previously reported activation (by KBrO3) and inhibition (by OTA) of protective pathways. However, the integration of omic datasets suggested that HA and DM were not driving forces in the gene expression changes induced by either chemical.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Limonciel, Alice UNSPECIFIED orcid.org/0000-0001-6588-5944 UNSPECIFIED van Breda, Simone G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jiang, Xiaoqi UNSPECIFIED UNSPECIFIED UNSPECIFIED Tredwell, Gregory D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilmes, Anja UNSPECIFIED orcid.org/0000-0001-9485-4565 UNSPECIFIED Aschauer, Lydia UNSPECIFIED UNSPECIFIED UNSPECIFIED Siskos, Alexandros P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sachinidis, Agapios UNSPECIFIED UNSPECIFIED UNSPECIFIED Keun, Hector C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kopp-Schneider, Annette UNSPECIFIED UNSPECIFIED UNSPECIFIED de Kok, Theo M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kleinjans, Jos C. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jennings, Paul UNSPECIFIED orcid.org/0000-0002-6860-2898 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-162462
DOI:	10.3389/fgene.2018.00558
Journal or Publication Title:	Front. Genet.
Volume:	9
Date:	2018
Publisher:	FRONTIERS MEDIA SA
Place of Publication:	LAUSANNE
ISSN:	1664-8021
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OCHRATOXIN-A; POTASSIUM BROMATE; INDUCED CYTOTOXICITY; OXIDATIVE STRESS; FOOD-ADDITIVES; DNA-DAMAGE; IN-VITRO; TOXICITY; KIDNEY; RAT Multiple languages Genetics & Heredity Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16246