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Erschienen in: European Journal of Nutrition 2/2017

14.11.2015 | Original Contribution

Hepatic DNA hydroxymethylation is site-specifically altered by chronic alcohol consumption and aging

verfasst von: Stephanie A. Tammen, Lara K. Park, Gregory G. Dolnikowski, Lynne M. Ausman, Simonetta Friso, Sang-Woon Choi

Erschienen in: European Journal of Nutrition | Ausgabe 2/2017

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Abstract

Purpose

Global DNA hydroxymethylation is markedly decreased in human cancers, including hepatocellular carcinoma, which is associated with chronic alcohol consumption and aging. Because gene-specific changes in hydroxymethylcytosine may affect gene transcription, giving rise to a carcinogenic environment, we determined genome-wide site-specific changes in hepatic hydroxymethylcytosine that are associated with chronic alcohol consumption and aging.

Methods

Young (4 months) and old (18 months) male C57Bl/6 mice were fed either an ethanol-containing Lieber–DeCarli liquid diet or an isocaloric control diet for 5 weeks. Genomic and gene-specific hydroxymethylcytosine patterns were determined through hydroxymethyl DNA immunoprecipitation array in hepatic DNA.

Results

Hydroxymethylcytosine patterns were more perturbed by alcohol consumption in young mice than in old mice (431 differentially hydroxymethylated regions, DhMRs, in young vs 189 DhMRs in old). A CpG island ~2.5 kb upstream of the glucocorticoid receptor gene, Nr3c1, had increased hydroxymethylation as well as increased mRNA expression (p = 0.015) in young mice fed alcohol relative to the control group. Aging alone also altered hydroxymethylcytosine patterns, with 331 DhMRs, but alcohol attenuated this effect. Aging was associated with a decrease in hydroxymethylcytosine ~1 kb upstream of the leptin receptor gene, Lepr, and decreased transcription of this gene (p = 0.029). Nr3c1 and Lepr are both involved in hepatic lipid homeostasis and hepatosteatosis, which may create a carcinogenic environment.

Conclusions

These results suggest that the location of hydroxymethylcytosine in the genome is site specific and not random, and that changes in hydroxymethylation may play a role in the liver’s response to aging and alcohol.
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Metadaten
Titel
Hepatic DNA hydroxymethylation is site-specifically altered by chronic alcohol consumption and aging
verfasst von
Stephanie A. Tammen
Lara K. Park
Gregory G. Dolnikowski
Lynne M. Ausman
Simonetta Friso
Sang-Woon Choi
Publikationsdatum
14.11.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Nutrition / Ausgabe 2/2017
Print ISSN: 1436-6207
Elektronische ISSN: 1436-6215
DOI
https://doi.org/10.1007/s00394-015-1098-4

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