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Kar A, Samanta A, Mukherjee S, Barik S, Biswas A. The HBV web: An insight into molecular interactomes between the hepatitis B virus and its host en route to hepatocellular carcinoma. J Med Virol 2023; 95:e28436. [PMID: 36573429 DOI: 10.1002/jmv.28436] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 11/26/2022] [Accepted: 12/23/2022] [Indexed: 12/28/2022]
Abstract
Hepatitis B virus (HBV) is a major aetiology associated with the development and progression of hepatocellular carcinoma (HCC), the most common primary liver malignancy. Over the past few decades, direct and indirect mechanisms have been identified in the pathogenesis of HBV-associated HCC which include altered signaling pathways, genome integration, mutation-induced genomic instability, chromosomal deletions and rearrangements. Intertwining of the HBV counterparts with the host cellular factors, though well established, needs to be systemized to understand the dynamics of host-HBV crosstalk and its consequences on HCC progression. Existence of a vast array of protein-protein and protein-nucleic acid interaction databases has led to the uncoiling of the compendia of genes/gene products associated with these interactions. This review covers the existing knowledge about the HBV-host interplay and brings it down under one canopy emphasizing on the HBV-host interactomics; and thereby highlights new strategies for therapeutic advancements against HBV-induced HCC.
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Affiliation(s)
- Arpita Kar
- Department of Signal Transduction and Biogenic Amines, Chittaranjan National Cancer Institute, Kolkata, West Bengal, India
| | - Abhisekh Samanta
- Department of Signal Transduction and Biogenic Amines, Chittaranjan National Cancer Institute, Kolkata, West Bengal, India
| | - Soumyadeep Mukherjee
- Department of In Vitro Carcinogenesis and Cellular Chemotherapy, Chittaranjan National Cancer Institute, Kolkata, West Bengal, India
| | - Subhasis Barik
- Department of In Vitro Carcinogenesis and Cellular Chemotherapy, Chittaranjan National Cancer Institute, Kolkata, West Bengal, India
| | - Avik Biswas
- Department of Signal Transduction and Biogenic Amines, Chittaranjan National Cancer Institute, Kolkata, West Bengal, India
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2
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Yang L, Zou T, Chen Y, Zhao Y, Wu X, Li M, Du F, Chen Y, Xiao Z, Shen J. Hepatitis B virus X protein mediated epigenetic alterations in the pathogenesis of hepatocellular carcinoma. Hepatol Int 2022; 16:741-754. [PMID: 35648301 DOI: 10.1007/s12072-022-10351-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 04/25/2022] [Indexed: 12/13/2022]
Abstract
Chronic hepatitis B virus (HBV) infection is a worldwide health problem. Hepatitis B virus X protein (HBx), a pleiotropic regulatory protein encoded by HBV, is necessary for the transcription of HBV covalently closed circular DNA (cccDNA) minichromosomes, and affects the epigenetic regulation of host cells. The epigenetic reprogramming of HBx on host cell genome is strongly involved in HBV-related HCC carcinogenesis. Here, we review the latest findings of the epigenetic regulation induced by HBx protein in hepatocellular carcinoma (HCC), including DNA methylation, histone modification and non-coding RNA expression. The influence of HBx on the epigenetic regulation of cccDNA is also summarized. In addition, preliminary studies of targeted drugs for epigenetic changes induced by HBx are also discussed. The exploration of epigenetic markers as potential targets will help to develop new prevention and/or treatment methods for HBx-related HCC.
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Affiliation(s)
- Liqiong Yang
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China
| | - Tao Zou
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China
| | - Yao Chen
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China
| | - Yueshui Zhao
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China
| | - Xu Wu
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China
| | - Mingxing Li
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China
| | - Fukuan Du
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China
| | - Yu Chen
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China
| | - Zhangang Xiao
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China.
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China.
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China.
| | - Jing Shen
- Laboratory of Molecular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China.
- Cell Therapy and Cell Drugs of Luzhou Key Laboratory, Luzhou, 646000, China.
- South Sichuan Institute of Translational Medicine, Luzhou, 646000, China.
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3
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Cha S, Jang KL. Hepatitis B virus X protein stimulates cell growth by downregulating p16 levels via PA28γ-mediated proteasomal degradation. J Gen Virol 2021; 101:963-971. [PMID: 32568029 DOI: 10.1099/jgv.0.001461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Proteasomal activator 28 gamma (PA28γ), an essential constituent of the 20S proteasome responsible for ubiquitin-independent degradation of target proteins, is frequently overexpressed in hepatocellular carcinoma. Recently, we have reported that hepatitis B virus (HBV) X protein (HBx) activates PA28γ expression in human hepatocytes via upregulation of p53 levels; however, its role in HBV tumorigenesis remains unknown. Here, we found that HBx-activated PA28γ downregulates p16 levels via ubiquitin-independent proteasomal degradation. As a result, HBx activated the Rb-E2F pathway and stimulated G1/S cell cycle progression, resulting in an increase in cell proliferation. The potential of HBx to induce these effects was reproduced in a 1.2-mer HBV replicon and in in vitro HBV infection systems and was almost completely abolished by either PA28γ knockdown or p16 overexpression, demonstrating the critical role of the PA28γ-mediated p16 degradation in HBV tumorigenesis.
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Affiliation(s)
- Sungkyung Cha
- Department of Microbiology, College of Natural Sciences, Pusan National University, Busan 46241, Republic of Korea
| | - Kyung Lib Jang
- Department of Microbiology, College of Natural Sciences, Pusan National University, Busan 46241, Republic of Korea
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4
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Wang DY, An SH, Liu L, Bai SS, Wu KX, Zhu R, Wang ZJ. Hepatitis B virus X protein influences enrichment profiles of H3K9me3 on promoter regions in human hepatoma cell lines. Oncotarget 2018; 7:84883-84892. [PMID: 27768594 PMCID: PMC5356706 DOI: 10.18632/oncotarget.12751] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 10/12/2016] [Indexed: 01/12/2023] Open
Abstract
We previously showed that hepatitis B virus (HBV) X protein (HBx) could promote the trimethylation of histone H3 lysine 9 (H3K9me3) to repress tumor suppressor genes in hepatocellular carcinoma (HCC). In this work, we analyze 23,148 human promoters using ChIP-chip to determine the effects of HBx on H3K9me3 enrichments in hepatoma cells with transfection of HBx-expressing plasmid. Immunohistochemistry for HBx and H3K9me3 was performed in 21 cases of HBV-associated HCC tissues. We identified that H3K9me3 immunoreactivity was significantly correlated with HBx staining in HCC tissues. ChIP-chip data indicated that HBx remarkably altered promoter enrichments of H3K9me3 in hepatoma cells. We identified 25 gene promoters, whose H3K9me3 enrichments are significantly altered in hepatoma cells transfected HBx-expressing plasmid, including 19 gaining H3K9m3, and six losing this mark. Most of these genes have not been previously reported in HCC, and BTBD17, MIR6089, ZNF205-AS1 and ZP1 have not previously been linked to cancer; only two genes (DAB2IP and ZNF185) have been reported in HCC. Genomic analyses suggested that genes with the differential H3K9me3 enrichments function in diverse cellular pathways and many are involved in cancer development and progression.
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Affiliation(s)
- Di-Yi Wang
- Department of Pathology, Affiliated Hospital of Taishan Medical University, Taian 271000, China
| | - Shu-Hong An
- Department of Human Anatomy, Taishan Medical University, Taian, 271000, China
| | - Lei Liu
- Department of Pathology, Affiliated Hospital of Taishan Medical University, Taian 271000, China
| | - Shan-Shan Bai
- Department of Pathology, The First people's Hospital of Taian, Taian, 271000, China
| | - Kai-Xiang Wu
- Department of Pathology, Affiliated Hospital of Taishan Medical University, Taian 271000, China
| | - Rong Zhu
- Department of Pathology, Shanghai Medical College, Fudan University, Shanghai 200032, China
| | - Zhao-Jin Wang
- Department of Human Anatomy, Taishan Medical University, Taian, 271000, China
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Kostyushev DS, Zueva AP, Brezgin SA, Lipatnikov AD, Volchkova EV, Maleyev VV, Chulanov VP. THE ROLE OF DNA-METHYLTRANSFERASES IN THE LIFE CYCLE OF HEPATITIS B VIRUS AND PATHOGENESIS OF CHRONIC HEPATITIS B. Vopr Virusol 2018; 63:19-29. [PMID: 36494993 DOI: 10.18821/0507-4088-2018-63-1-19-29] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Indexed: 12/13/2022]
Abstract
Chronic hepatitis B is caused by a persistent form of hepatitis B virus, covalently closed circular DNA (cccDNA). Stability of cccDNA is associated with intracellular localization of cccDNA and formation of minichromosome, regulated by epigenetic mechanisms. One of the key mechanisms in epigenetics is methylation of DNA on CpG islands. Expression levels of DNA-methyltransferases (DNMTs) in chronic hepatitis B patients were shown to be upregulated. Nevertheless, the role of DNMTs in the life cycle of HBV and their effects on the cell remain elusive. In this review, we discuss latest achievements on the role of DNMTs in chronic hepatitis B and HBV in vitro models.
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Affiliation(s)
| | - A P Zueva
- Central Research Institute of Epidemiology.,M.V. Lomonosov Moscow State University
| | - S A Brezgin
- Central Research Institute of Epidemiology.,I.M. Sechenov First State Medical University
| | - A D Lipatnikov
- Central Research Institute of Epidemiology.,D.I. Mendeleev University of Chemical Technology of Russia
| | | | | | - V P Chulanov
- Central Research Institute of Epidemiology.,I.M. Sechenov First State Medical University
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Lv X, Ye G, Zhang X, Huang T. p16 Methylation was associated with the development, age, hepatic viruses infection of hepatocellular carcinoma, and p16 expression had a poor survival: A systematic meta-analysis (PRISMA). Medicine (Baltimore) 2017; 96:e8106. [PMID: 28930859 PMCID: PMC5617726 DOI: 10.1097/md.0000000000008106] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Loss of tumor suppressor gene p16 expression via promoter methylation has been reported in hepatocellular carcinoma (HCC). This meta-analysis was conducted to evaluate the correlation between p16 methylation and HCC. Additionally, we also analyzed the potential prognostic role of p16 methylation, expression or alteration-associated HCC. METHODS Online databases based on the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guideline were performed to analyze the role of p16 gene in HCC. The combined odds ratios (ORs) or hazard ratios (HRs) and their 95% confidence intervals (95% CIs) were summarized. RESULTS Final 3105 HCCs and 808 non-tumor controls (chronic hepatitis and liver cirrhosis) were performed in this meta-analysis. p16 promoter methylation in HCC was significantly higher than in chronic hepatitis and chronic hepatitis in tissue and blood samples. In addition, p16 promoter methylation was notably higher in patients >50 years' old than in patients aged <50 years, and it was higher in hepatitis B virus (HBV) or hepatitis C virus (HCV)-positive HCC than in hepatic viruses-negative HCC. However, p16 promoter methylation was not correlated with sex, cirrhosis, tumor differentiation, clinical stage. No association was found between p16 methylation or alteration and the prognosis of patients with HCC in overall survival (OS) and disease-free survival (DFS). Although p16 expression was significantly correlated with a poor prognosis in OS and DFS (P < .05) CONCLUSIONS:: Our results indicate that p16 methylation was linked to the development, age, HBV, and HCV infection of HCC. p16 methylation or alteration was not associated with the prognosis, but p16 expression was linked to a poor survival.
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7
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Xu H, Hao S, Zhang J, Chen Z, Wang H, Guan W. The formation and modification of chromatin-like structure of human parvovirus B19 regulate viral genome replication and RNA processing. Virus Res 2017; 232:134-138. [PMID: 28263841 DOI: 10.1016/j.virusres.2017.03.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 03/01/2017] [Accepted: 03/01/2017] [Indexed: 11/25/2022]
Abstract
B19 virus (B19V) is a single stranded virus in the genus of Erythroparvovirus in the family of Parvoviridae. One of the limiting steps of B19V infection is the replication of viral genome which affected the alternative processing of its RNA. Minute virus of mice (MVM) and adeno-associated virus (AAV) has been reported to form chromatin-like structure within hours after infection of cells. However, the role of chromatin-like structure is unclear. In the present study, we found that B19V formed chromatin-like structure after 12h when B19V infectious clone was co-transfected with pHelper plasmid to HEK293T cells. Interestingly, the inhibitor of DNA methyl-transferase (5-Aza-2'-deoxycytidine, DAC) inhibited not only the formation of chromatin-like structure, but also the replication of the viral genomic DNA. More importantly, the splicing of the second intron at splice acceptor sites (A2-1, and A2-2) were reduced and polyadenylation at (pA)p increased when transfected HEK293T cells were treated with DAC. Our results showed that the formation and modification of chromatin-like structure are a new layer to regulate B19V gene expression and RNA processing.
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Affiliation(s)
- Huanzhou Xu
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Sujuan Hao
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Junmei Zhang
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhen Chen
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Hanzhong Wang
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Wuxiang Guan
- Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China.
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Wang F, Feng Y, Li P, Wang K, Feng L, Liu YF, Huang H, Guo YB, Mao QS, Xue WJ. RASSF10 is an epigenetically inactivated tumor suppressor and independent prognostic factor in hepatocellular carcinoma. Oncotarget 2016; 7:4279-97. [PMID: 26701853 PMCID: PMC4826205 DOI: 10.18632/oncotarget.6654] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 12/04/2015] [Indexed: 01/12/2023] Open
Abstract
Methylation of the Ras-association domain family 10 (RASSF10) promoter region correlates with clinicopathological characteristics and poor prognosis in several human cancers. Here, we examined RASSF10 expression in hepatocellular carcinoma (HCC) and its role in hepatocarcinogenesis. RASSF10 mRNA and protein levels were downregulated in both HCC cell lines and patient tissue samples. In patient tissues, low RASSF10 levels correlated with hepatocirrhosis, poor tumor differentiation, tumor thrombus and Barcelona Clinic Liver Cancer stage, and were indicative of increased tumor recurrence and reduced patient survival. Low RASSF10 expression was associated with promoter hypermethylation, which was in turn associated with polycyclic aromatic hydrocarbon and aflatoxin B1 exposure, but not DNA methyltransferase expression. Overexpression of RASSF10 in HCC cell lines suppressed cell growth and colony formation, and induced apoptosis by up- or down-regulating specific Bcl-2 family proteins. RASSF10 overexpression increased pro-apoptotic Bax and Bad levels, but decreased anti-apoptotic Bcl-2 and Bcl-xl expression. Overexpression also inhibited tumor formation in nude mice and reduced cell migration and invasion by inhibiting the epithelial-mesenchymal transition. RASSF10 knockdown promoted cell growth. Our results show that RASSF10 is frequently hypermethylated and down-regulated in HCC and can potentially serve as a useful biomarker predictive of HCC patient prognosis.
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Affiliation(s)
- Fei Wang
- Department of General Surgery, Nantong University Affiliated Hospital, Nantong, Jiangsu, China
| | - Ying Feng
- Department of General Surgery, Nantong University Affiliated Hospital, Nantong, Jiangsu, China
| | - Peng Li
- Department of General Surgery, Nantong University Affiliated Hospital, Nantong, Jiangsu, China
| | - Kun Wang
- Department of General Surgery, Nantong University Affiliated Hospital, Nantong, Jiangsu, China.,Department of General Surgery, Changzhou Wujin People's Hospital, Changzhou, Jiangsu, China
| | - Liang Feng
- Department of General Surgery, Nantong University Affiliated Hospital, Nantong, Jiangsu, China
| | - Yi-Fei Liu
- Department of Pathology, Nantong University Affiliated Hospital, Nantong, Jiangsu, China
| | - Hua Huang
- Department of Pathology, Nantong University Affiliated Hospital, Nantong, Jiangsu, China
| | - Yi-Bing Guo
- Department of Surgical Comprehensive Laboratory, Nantong University Affiliated Hospital, Nantong, Jiangsu, China
| | - Qin-Sheng Mao
- Department of General Surgery, Nantong University Affiliated Hospital, Nantong, Jiangsu, China
| | - Wan-Jiang Xue
- Department of General Surgery, Nantong University Affiliated Hospital, Nantong, Jiangsu, China
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Wang Q, Wang Y, Xing Y, Yan Y, Guo P, Zhuang J, Qin F, Zhang J. RETRACTED: Physcion 8-O-β-glucopyranoside induces apoptosis, suppresses invasion and inhibits epithelial to mesenchymal transition of hepatocellular carcinoma HepG2 cells. Biomed Pharmacother 2016; 83:372-380. [PMID: 27416558 DOI: 10.1016/j.biopha.2016.06.045] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 06/22/2016] [Accepted: 06/25/2016] [Indexed: 12/12/2022] Open
Abstract
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief. Panels from Figure 4A appear similar to panels from Figure 1 of the article previously published by Z. Ding, F. Xu, J. Tang, G. Li, P. Jiang, Z. Tang and H. Wu in Neoplasma 63(3) (2016) 351–361 http://www.elis.sk/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=4703&category_id=128&option=com_virtuemart&vmcchk=1&Itemid=1. One of the conditions of submission of a paper for publication is that authors declare explicitly that the paper has not been previously published and is not under consideration for publication elsewhere. Re-use of any data should be appropriately cited. As such this article represents a misuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process.
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Affiliation(s)
- Qiang Wang
- Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Yong Wang
- Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Yuqing Xing
- Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Yi Yan
- Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Peng Guo
- Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Jianguang Zhuang
- Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Fawei Qin
- Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Jie Zhang
- Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China.
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Fu X, Song X, Li Y, Tan D, Liu G. Hepatitis B virus X protein upregulates DNA methyltransferase 3A/3B and enhances SOCS-1CpG island methylation. Mol Med Rep 2016; 13:301-8. [PMID: 26573490 DOI: 10.3892/mmr.2015.4545] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Accepted: 09/22/2015] [Indexed: 02/07/2023] Open
Abstract
The aim of the present study was to investigate the effect of hepatitis B virus X protein (HBx) on the expression of DNA methyltransferase (DNMT)3A/3B and suppressors of cytokine signaling‑1 (SOCS‑1), as well as promoter CpG island methylation of the SOCS‑1 gene. Stable hepatocyte cell lines expressing the HBx gene (pcDNA‑X/QSG7701) or an empty gene (pcDNA3.0/QSG7701) were established. Reverse transcription quantitative polymerase chain reaction (PCR) was used to detect the mRNA expression levels of DNMT3A/3B and SOCS‑1. Immunohistochemistry was used to detect the protein expression of DNMT3A/3B. Methylation‑specific PCR (MSP) was used to detect the methylation status of the SOCS‑1 gene promoter. The mRNA and protein expression levels of DNMT3A/3B were significantly higher in the pcDNA‑X/QSG7701‑transfected cells, compared with those in the pcDNA3.0/QSG7701 or non‑transfected QSG7701 cells (P<0.05), whereas the relative mRNA expression of SOCS‑1 was significantly lower in the pcDNA‑X/QSG7701 cells compared with the pcDNA3.0/QSG7701 and non‑transfected QSG7701 cells (F=19.6; P<0.05). Western blot analysis showed that the protein expression of SOCS‑1 was significantly lower in the pcDNA‑X/QSG7701 cells, compared with the pcDNA3.0/QSG7701 or non‑transfected QSG7701 cells (F=19.4; P<0.05). The results of the MSP analysis showed that SOCS‑1 promoter region methylation was present only in the pcDNA‑X/QSG7701 cells. The HBV‑X gene upregulated the mRNA and protein expression levels of DNMT3A/3B, downregulated the expression of SOCS‑1 and increased SOCS‑1 gene promoter CpG island methylation. This may provide a potential explanation of the mechanism underlying HBx-associated hepatocellular carcinoma.
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Affiliation(s)
- Xiaoyu Fu
- Department of Infectious Disease, Key Laboratory of Viral Hepatitis of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Xiaoling Song
- Department of Infectious Disease, East of People's Hospital, Linyi, Shandong 276034, P.R. China
| | - Yanyan Li
- Department of Infectious Disease, The Eighth People's Hospital of Nanchang, Nanchang, Jiangxi 330008, P.R. China
| | - Deming Tan
- Department of Infectious Disease, Key Laboratory of Viral Hepatitis of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Guozhen Liu
- Department of Infectious Disease, Key Laboratory of Viral Hepatitis of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
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11
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Geng M, Xin X, Bi LQ, Zhou LT, Liu XH. Molecular mechanism of hepatitis B virus X protein function in hepatocarcinogenesis. World J Gastroenterol 2015; 21:10732-10738. [PMID: 26478665 PMCID: PMC4600575 DOI: 10.3748/wjg.v21.i38.10732] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 06/24/2015] [Accepted: 09/02/2015] [Indexed: 02/06/2023] Open
Abstract
Many factors are considered to contribute to hepatitis B virus (HBV)-associated hepatocellular carcinoma (HCC), including products of HBV, HBV integration and mutation, and host susceptibility. HBV X protein (HBx) can interfere with several signaling pathways associated with cell proliferation and invasion, and HBx C-terminal truncation has been suggested to impact the development of HCC. This review focuses on the pathological functions of HBx in HBV-induced hepatocarcinogenesis. As a transactivator, HBx can affect regulatory non-coding RNAs (ncRNAs), including microRNAs and long ncRNAs. HBx is also involved in epigenetic modification and DNA repair. HBx interacts with various signal-transduction pathways, such as the p53, Wnt, and nuclear factor-κB pathways. We conclude that HBx hastens the development of hepatoma.
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12
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Tang S, Hu W, Hu J, Wu S, Li J, Luo Y, Cao M, Zhou H, Jiang X. Hepatitis B virus X protein promotes P3 transcript expression of the insulin-like growth factor 2 gene via inducing hypomethylation of P3 promoter in hepatocellular carcinoma. Liver Int 2015; 35:608-19. [PMID: 24423280 DOI: 10.1111/liv.12469] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Accepted: 01/08/2014] [Indexed: 12/11/2022]
Abstract
BACKGROUND & AIMS Hepatitis B virus (HBV) X protein (HBx) contributes to hepatocarcinogenesis. The overexpression of transcripts from P3 and P4 promoters of the insulin-like growth factor 2 (IGF2) gene is observed in hepatocellular carcinoma (HCC). Here, we aimed to explore the involvement of HBx in P3-driven mRNA overexpression and underlying epigenetic mechanism. METHODS P3 mRNA, P3 methylation status, HBx mRNA and HBx protein were analysed in human HCC samples with and without HBV infection using quantitative RT-PCR, bisulphite sequencing and Western blotting. The effects of HBx on P3 mRNA expression, and P3 transcriptional activity and methylation were further evaluated in HCC cell lines. RESULTS P3 mRNA level was higher and P3 methylation level was lower in HBV-positive HCC specimens compared with those of HBV-negative HCC specimens. P3 transcript abundance was positively correlated with HBx expression and negatively correlated with P3 methylation in HCC specimens. The stable expression of HBx upregulated P3 mRNA expression and reduced P3 methylation level in HepG2-HBx cells. The transient expression of HBx stimulated P3 promoter activity and decreased P3 methylation level of P3 promoter-luciferase construct in a dose-dependent manner in HepG2 and Huh-7 cells. Furthermore, HBx mRNA expression was found to be independent predictive factors for both shorter disease-free survival time and shorter overall survival time of HCC patients. CONCLUSION HBx may promote IGF2-P3 transcript expression by inducing hypomethylation of P3 promoter and may be associated with an inferior clinical outcome of HBV-related HCC patients. This study provides useful information for understanding the mechanism of HBx-mediated HCC.
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Affiliation(s)
- Shaohui Tang
- Department of Gastroenterology, The First Affiliated Hospital, Jinan University, Guangzhou, China
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Anestopoulos I, Voulgaridou GP, Georgakilas AG, Franco R, Pappa A, Panayiotidis MI. Epigenetic therapy as a novel approach in hepatocellular carcinoma. Pharmacol Ther 2014; 145:103-19. [PMID: 25205159 DOI: 10.1016/j.pharmthera.2014.09.005] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 09/02/2014] [Indexed: 02/07/2023]
Abstract
Hepatocellular carcinoma (HCC) is the most common type of liver malignancy and one with high fatality. Its 5-year survival rate remains low and thus, there is a need for improvement of current treatment strategies as well as development of novel targeted methodologies in order to optimize existing therapeutic protocols. To this end, only recently, it was discovered that its pathophysiology also involves epigenetic alterations in DNA methylation, histone modifications and/or non-coding microRNA patterns. Unlike genetic events, epigenetic alterations are reversible and thus potentially considered to be an alternative option in cancer treatment protocols. In this review, we describe the general characteristics and resulted major alterations of the epigenetic machinery as well as current state of progress of epigenetic therapy (via different single or combinatorial experimental approaches) in HCC.
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Affiliation(s)
- Ioannis Anestopoulos
- Department of Molecular Biology & Genetics, Democritus University of Thrace, Alexandroupolis, Greece
| | | | - Alexandros G Georgakilas
- School of Applied Mathematical & Physical Sciences, National Technical University of Athens, Athens, Greece
| | - Rodrigo Franco
- Redox Biology Center, School of Veterinary Medicine & Biomedical Sciences, Redox Biology Center, University of Nebraska-Lincoln, USA
| | - Aglaia Pappa
- Department of Molecular Biology & Genetics, Democritus University of Thrace, Alexandroupolis, Greece
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Jiang SS, Huang SF, Huang MS, Chen YT, Jhong HJ, Chang IC, Chen YT, Chang JW, Chen WL, Lee WC, Chen MF, Yeh CT, Matsuura I. Dysregulation of the TGFBI gene is involved in the oncogenic activity of the nonsense mutation of hepatitis B virus surface gene sW182*. Biochim Biophys Acta Mol Basis Dis 2014; 1842:1080-7. [DOI: 10.1016/j.bbadis.2014.03.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 03/05/2014] [Accepted: 03/09/2014] [Indexed: 01/14/2023]
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The Complex Relationship between Liver Cancer and the Cell Cycle: A Story of Multiple Regulations. Cancers (Basel) 2014; 6:79-111. [PMID: 24419005 PMCID: PMC3980619 DOI: 10.3390/cancers6010079] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 12/24/2013] [Accepted: 01/03/2014] [Indexed: 12/14/2022] Open
Abstract
The liver acts as a hub for metabolic reactions to keep a homeostatic balance during development and growth. The process of liver cancer development, although poorly understood, is related to different etiologic factors like toxins, alcohol, or viral infection. At the molecular level, liver cancer is characterized by a disruption of cell cycle regulation through many molecular mechanisms. In this review, we focus on the mechanisms underlying the lack of regulation of the cell cycle during liver cancer, focusing mainly on hepatocellular carcinoma (HCC). We also provide a brief summary of novel therapies connected to cell cycle regulation.
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Qiu X, Zhang L, Lu S, Song Y, Lao Y, Hu J, Fan H. Upregulation of DNMT1 mediated by HBx suppresses RASSF1A expression independent of DNA methylation. Oncol Rep 2014; 31:202-8. [PMID: 24247422 DOI: 10.3892/or.2013.2848] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 09/02/2013] [Indexed: 12/12/2022] Open
Abstract
The hepatitis B virus (HBV) X protein (HBx) plays a key role in the molecular pathogenesis of HBV-related hepatocellular carcinoma (HCC). However, its critical gene targets remain largely unknown. RASSF1A gene (Ras-association domain family 1A, RASSF1A), a tumor-suppressor gene, is frequently found to be hypermethylated and downregulated in HCC. In the present study, we investigated whether HBx is involved in the hypermethylation and downregulation of RASSF1A and we examined the potential regulation mechanisms. RT-PCR analysis was used to determine RASSF1A and HBx expression in 9 liver cell lines and the results showed that RASSF1A expression was relatively low in HBx-positive cells. Notably, RASSF1A was downregulated in HepG2.2.15 cells, as compared to HepG2 cells. Further analysis revealed that HBx transfection suppressed RASSF1A expression and HBx knockdown induced its expression. Enforced HBx suppressed RASSF1A and meanwhile induced DNMT1 and DNMT3B expression. In addition, RASSF1A is negatively regulated by DNMT1. ChIP analysis using an antibody against DNMT1 revealed that HBx enhanced the binding of DNMT1 to the RASSF1A promoter but the inhibition of RASSF1A by HBx is DNA methylation-independent as detected by methylation-specific PCR (MSP). Further studies using MSP and bisulfite genomic sequencing (BGS) revealed that no significant methylation changes were observed for regional methylation levels of RASSF1A in DNMT1 knockdown cells, although methylation levels of specific CpG sites at the predicted binding sites for the Sp1 and USF transcription factors were reduced. Additionally, RASSF1A was downregulated in HBV-associated HCC (HBV-HCC) as detected by RT-PCR and immunohistochemistry suggesting RASSF1A expression may be related to HBx in HCC and the clinical relevance of our observations. Collectively, our data showed that HBx suppressed RASSF1A expression via DNMT1 and offered a new mechanism of RASSF1A inactive in HCC in addition to the widely known DNA methylation, enriching the epigenetic mechanism by which HBx contributes to the pathogenesis of HBV-HCC.
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Affiliation(s)
- Xuemei Qiu
- Department of Medical Genetics and Developmental Biology, Medical School of Southeast University and the Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Southeast University, Nanjing, Jiangsu, P.R. China
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17
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Wu YL, Wang D, Peng XE, Chen YL, Zheng DL, Chen WN, Lin X. Epigenetic silencing of NAD(P)H:quinone oxidoreductase 1 by hepatitis B virus X protein increases mitochondrial injury and cellular susceptibility to oxidative stress in hepatoma cells. Free Radic Biol Med 2013; 65:632-644. [PMID: 23920313 DOI: 10.1016/j.freeradbiomed.2013.07.037] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 07/22/2013] [Accepted: 07/24/2013] [Indexed: 12/31/2022]
Abstract
NAD(P)H:quinone oxidoreductase 1 (NQO1) is a phase II enzyme that participates in the detoxification of dopamine-derived quinone molecules and reactive oxygen species. Our prior work using a proteomic approach found that NQO1 protein levels were significantly decreased in stable hepatitis B virus (HBV)-producing hepatoma cells relative to the empty-vector-transfected controls. However, the mechanism and biological significance of the NQO1 suppression remain elusive. In this study we demonstrate that HBV X protein (HBx) induces epigenetic silencing of NQO1 in hepatoma cells through promoter hypermethylation via recruitment of DNA methyltransferase DNMT3A to the promoter region of the NQO1 gene. In HBV-related hepatocellular carcinoma (HCC) specimens, HBx expression was correlated negatively to NQO1 transcripts but positively to NQO1 promoter hypermethylation. Downregulation of NQO1 by HBx reduced intracellular glutathione levels, impaired mitochondrial function, and increased susceptibility of hepatoma cells to oxidative stress-induced cell injury. These results suggest a novel mechanism for HBV-mediated pathogenesis of chronic liver diseases, including HCC.
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Affiliation(s)
- Yun-Li Wu
- Key Laboratory of Ministry of Education for Gastrointestinal Cancer, School of Basic Medical Sciences, Fujian Medical University, Fuzhou 350108, China
| | - Dong Wang
- Department of Hepatobiliary and Pancreatic Surgery, Union Clinical Medical College, Fujian Medical University, Fuzhou 350108, China
| | - Xian-E Peng
- Key Laboratory of Ministry of Education for Gastrointestinal Cancer, School of Basic Medical Sciences, Fujian Medical University, Fuzhou 350108, China
| | - Yan-Ling Chen
- Department of Hepatobiliary and Pancreatic Surgery, Union Clinical Medical College, Fujian Medical University, Fuzhou 350108, China
| | - Da-Li Zheng
- Key Laboratory of Ministry of Education for Gastrointestinal Cancer, School of Basic Medical Sciences, Fujian Medical University, Fuzhou 350108, China
| | - Wan-Nan Chen
- Key Laboratory of Ministry of Education for Gastrointestinal Cancer, School of Basic Medical Sciences, Fujian Medical University, Fuzhou 350108, China; Key Laboratory of Tumor Microbiology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou 350108, China
| | - Xu Lin
- Key Laboratory of Ministry of Education for Gastrointestinal Cancer, School of Basic Medical Sciences, Fujian Medical University, Fuzhou 350108, China; Key Laboratory of Tumor Microbiology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou 350108, China.
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Duan CH, Tai S. Role of hepatitis B virus X protein in hepatocarcinogenesis. Shijie Huaren Xiaohua Zazhi 2013; 21:2397-2402. [DOI: 10.11569/wcjd.v21.i24.2397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is the fifth most common cancer in the world and the third most common cause of cancer-related death. Chronic hepatitis B virus (HBV) infection has been identified as a major risk factor for HCC. Evidence suggests that the HBV X protein (HBx) plays a crucial role in the carcinogenesis of HCC. HBx is a multifunctional regulator that plays a key role in the occurrence, development, invasion and metastasis of cancers. Due to its important roles in the development of HCC, the research on the HBx protein has become a hot topic in recent years. This review describes the latest advances in understanding the role of the HBx protein in hepatocarcinogenesis.
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Herceg Z, Lambert MP, van Veldhoven K, Demetriou C, Vineis P, Smith MT, Straif K, Wild CP. Towards incorporating epigenetic mechanisms into carcinogen identification and evaluation. Carcinogenesis 2013; 34:1955-67. [PMID: 23749751 DOI: 10.1093/carcin/bgt212] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Remarkable progress in the field of epigenetics has turned academic, medical and public attention to the potential applications of these new advances in medicine and various fields of biomedical research. The result is a broader appreciation of epigenetic phenomena in the a etiology of common human diseases, most notably cancer. These advances also represent an exciting opportunity to incorporate epigenetics and epigenomics into carcinogen identification and safety assessment. Current epigenetic studies, including major international sequencing projects, are expected to generate information for establishing the 'normal' epigenome of tissues and cell types as well as the physiological variability of the epigenome against which carcinogen exposure can be assessed. Recently, epigenetic events have emerged as key mechanisms in cancer development, and while our search of the Monograph Volume 100 revealed that epigenetics have played a modest role in evaluating human carcinogens by the International Agency for Research on Cancer (IARC) Monographs so far, epigenetic data might play a pivotal role in the future. Here, we review (i) the current status of incorporation of epigenetics in carcinogen evaluation in the IARC Monographs Programme, (ii) potential modes of action for epigenetic carcinogens, (iii) current in vivo and in vitro technologies to detect epigenetic carcinogens, (iv) genomic regions and epigenetic modifications and their biological consequences and (v) critical technological and biological issues in assessment of epigenetic carcinogens. We also discuss the issues related to opportunities and challenges in the application of epigenetic testing in carcinogen identification and evaluation. Although the application of epigenetic assays in carcinogen evaluation is still in its infancy, important data are being generated and valuable scientific resources are being established that should catalyse future applications of epigenetic testing.
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Affiliation(s)
- Zdenko Herceg
- International Agency for Research on Cancer (IARC), 150 Cours Albert Thomas, F-69008 Lyon, France
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Tan YJ. Hepatitis B virus infection and the risk of hepatocellular carcinoma. World J Gastroenterol 2011; 17:4853-7. [PMID: 22171125 PMCID: PMC3235627 DOI: 10.3748/wjg.v17.i44.4853] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2011] [Revised: 07/06/2011] [Accepted: 07/13/2011] [Indexed: 02/06/2023] Open
Abstract
Epidemiological studies have provided overwhelming evidence for a causal role of chronic hepatitis B virus (HBV) infection in the development of hepatocellular carcinoma (HCC). However, the pathogenesis of HBV infection and carcinogenesis of HBV-associated HCC are still elusive. This review will summarize the current knowledge on the mechanisms involved in HBV-related liver carcinogenesis. The role of HBV in tumor formation appears to be complex, and may involve both direct and indirect mechanisms. Integration of HBV DNA into the host genome occurs at early steps of clonal tumor expansion, and it has been shown to enhance the host chromosomal instability, leading to large inverted duplications, deletions and chromosomal translocations. It has been shown that the rate of chromosomal alterations is increased significantly in HBV-related tumors. Prolonged expression of the viral regulatory HBV x protein may contribute to regulating cellular transcription, protein degradation, proliferation, and apoptotic signaling pathways, and it plays a critical role in the development of hepatocellular carcinoma.
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Pollicino T, Saitta C, Raimondo G. Hepatocellular carcinoma: the point of view of the hepatitis B virus. Carcinogenesis 2011; 32:1122-32. [PMID: 21665892 DOI: 10.1093/carcin/bgr108] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Teresa Pollicino
- Department of Internal Medicine, Unit of Clinical and Molecular Hepatology, University Hospital of Messina, Via Consolare Valeria, Messina, Italy.
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