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BMC Cancer
Published in: BMC Cancer 1/2012

Open Access 01-12-2012 | Research article

Oxidative DNA damage correlates with cell immortalization and mir-92 expression in hepatocellular carcinoma

Authors: Cardin Romilda, Piciocchi Marika, Sinigaglia Alessandro, Lavezzo Enrico, Bortolami Marina, Kotsafti Andromachi, Cillo Umberto, Zanus Giacomo, Mescoli Claudia, Rugge Massimo, Farinati Fabio

Published in: BMC Cancer | Issue 1/2012

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Abstract

Background

MicroRNAs expression has been extensively studied in hepatocellular carcinoma but little is known regarding the relationship, if any, with inflammation, production of reactive oxygen species (ROS), host’s repair mechanisms and cell immortalization. This study aimed at assessing the extent of oxidative DNA damage (8-hydroxydeoxyguanosine - 8-OHdG) in different phases of the carcinogenetic process, in relation to DNA repair gene polymorphism, telomeric dysfunction and to the expression of several microRNAs, non-coding genes involved in post-transcriptional regulation, cell proliferation, differentiation and death.

Methods

Tissue samples obtained either at surgery, [neoplastic (HCC) and adjacent non-cancerous cirrhotic tissues (NCCT)] at percutaneous or laparoscopic biopsy (patients with HCV or HBV-related hepatitis or patients undergoing cholecystectomy) were analysed for 8-OHdG (HPLC-ED), OGG1 (a DNA repair gene) polymorphism (PCR-RFLP), telomerase activity, telomere length (T/S, by RT-PCR), Taqman microRNA assay and Bad/Bax mRNA (RT-PCR). Fifty-eight samples from 29 HCC patients (obtained in both neoplastic and peritumoral tissues), 22 from chronic hepatitis (CH) and 10 controls (cholecystectomy patients - CON) were examined.

Results

Eight-OHdG levels were significantly higher in HCC and NCCT than in CH and CON (p=0.001). Telomerase activity was significantly higher in HCC than in the remaining subgroups (p=0.002); conversely T/S was significantly lower in HCC (p=0.05). MiR-199a-b, -195, -122, -92a and −145 were down-regulated in the majority of HCCs while miR-222 was up-regulated. A positive correlation was observed among 8-OHdG levels, disease stage, telomerase activity, OGG1 polymorphisms and ALT/GGT levels. In HCC, miR-92 expression correlated positively with telomerase activity, 8-OHdG levels and Bad/Bax mRNA.

Conclusions

The above findings confirm the accumulation, in the progression of chronic liver damage to HCC, of a ROS-mediated oxidative DNA damage, and suggest that this correlates with induction of telomerase activity and, as a novel finding, with over-expression of miR-92, a microRNA that plays a role in both the apoptotic process and in cellular proliferation pathways.
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Metadata
Title
Oxidative DNA damage correlates with cell immortalization and mir-92 expression in hepatocellular carcinoma
Authors
Cardin Romilda
Piciocchi Marika
Sinigaglia Alessandro
Lavezzo Enrico
Bortolami Marina
Kotsafti Andromachi
Cillo Umberto
Zanus Giacomo
Mescoli Claudia
Rugge Massimo
Farinati Fabio
Publication date
01-12-2012
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2012
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-12-177

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