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Erschienen in: Digestive Diseases and Sciences 6/2012

01.06.2012 | Original Article

DNA Methyltransferases 1 and 3b Expression in Huh-7 Cells Expressing HCV Core Protein of Different Genotypes

verfasst von: Giorgia Benegiamo, Manlio Vinciguerra, Gianluigi Mazzoccoli, Ada Piepoli, Angelo Andriulli, Valerio Pazienza

Erschienen in: Digestive Diseases and Sciences | Ausgabe 6/2012

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Abstract

Background

Hepatitis C virus infects ~3 % of the population and it is a risk factor for hepatocarcinogenesis. The epigenetic mechanisms of HCV-induced hepatocyte transformation towards malignancy in this context are unclear.

Aims

The purpose of this study was to evaluate the effect of HCV core proteins of different genotypes on DNA methyltransferases (DNMTs) induction.

Materials/Methods

We investigated DNMT1, DNMT3b and E-Cadherin (CDH1) mRNA and protein expression levels in an in vitro model of Huh-7 cells expressing the HCV core protein of different genotypes: 1b, 2a, 3a, 4h and 5a.

Results

We found that both mRNA and protein expression levels of DNMT1 and 3b were upregulated in genotype 1b HCV core expressing cells as compared to control cells. DNMT3b mRNA levels did not change in genotypes 2a, 3a, 4h and 5a, but were upregulated at the protein level by genotype 1b, 2a, 3a. CDH1 mRNA expression was downregulated only in genotype 1b, whereas its protein expression resulted in downregulation by the HCV core of genotypes 1b, 2a and 3a. Conversely, no significant changes were observed for DNMTs and CDH1 investigated in Huh-7 cells expressing the genotypes 4h and 5a. Furthermore, we present evidence that HCV core 1b protein expression induces DNMTs overexpression through STAT3 protein as demonstrated by NSC74859 treatment. Moreover, SIRT1 inhibition affected DNMT1 and 3b expression only in HCV core protein genotype 1b expressing cells as demonstrated by treatment with its inhibitor sirtinol.

Conclusions

Our findings suggest that HCV core protein could play a role in HCC development at least in part by altering DNMTs expression.
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Metadaten
Titel
DNA Methyltransferases 1 and 3b Expression in Huh-7 Cells Expressing HCV Core Protein of Different Genotypes
verfasst von
Giorgia Benegiamo
Manlio Vinciguerra
Gianluigi Mazzoccoli
Ada Piepoli
Angelo Andriulli
Valerio Pazienza
Publikationsdatum
01.06.2012
Verlag
Springer US
Erschienen in
Digestive Diseases and Sciences / Ausgabe 6/2012
Print ISSN: 0163-2116
Elektronische ISSN: 1573-2568
DOI
https://doi.org/10.1007/s10620-012-2160-1

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