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Hepatitis B Viral Protein HBx and the Molecular Mechanisms Modulating the Hallmarks of Hepatocellular Carcinoma: A Comprehensive Review. Cells 2022; 11:cells11040741. [PMID: 35203390 PMCID: PMC8870387 DOI: 10.3390/cells11040741] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 02/10/2022] [Accepted: 02/16/2022] [Indexed: 02/06/2023] Open
Abstract
With 296 million cases estimated worldwide, chronic hepatitis B virus (HBV) infection is the most common risk factor for hepatocellular carcinoma (HCC). HBV-encoded oncogene X protein (HBx), a key multifunctional regulatory protein, drives viral replication and interferes with several cellular signalling pathways that drive virus-associated hepatocarcinogenesis. This review article provides a comprehensive overview of the role of HBx in modulating the various hallmarks of HCC by supporting tumour initiation, progression, invasion and metastasis. Understanding HBx-mediated dimensions of complexity in driving liver malignancies could provide the key to unlocking novel and repurposed combinatorial therapies to combat HCC.
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2
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Van Damme E, Vanhove J, Severyn B, Verschueren L, Pauwels F. The Hepatitis B Virus Interactome: A Comprehensive Overview. Front Microbiol 2021; 12:724877. [PMID: 34603251 PMCID: PMC8482013 DOI: 10.3389/fmicb.2021.724877] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 08/17/2021] [Indexed: 12/19/2022] Open
Abstract
Despite the availability of a prophylactic vaccine, chronic hepatitis B (CHB) caused by the hepatitis B virus (HBV) is a major health problem affecting an estimated 292 million people globally. Current therapeutic goals are to achieve functional cure characterized by HBsAg seroclearance and the absence of HBV-DNA after treatment cessation. However, at present, functional cure is thought to be complicated due to the presence of covalently closed circular DNA (cccDNA) and integrated HBV-DNA. Even if the episomal cccDNA is silenced or eliminated, it remains unclear how important the high level of HBsAg that is expressed from integrated HBV DNA is for the pathology. To identify therapies that could bring about high rates of functional cure, in-depth knowledge of the virus' biology is imperative to pinpoint mechanisms for novel therapeutic targets. The viral proteins and the episomal cccDNA are considered integral for the control and maintenance of the HBV life cycle and through direct interaction with the host proteome they help create the most optimal environment for the virus whilst avoiding immune detection. New HBV-host protein interactions are continuously being identified. Unfortunately, a compendium of the most recent information is lacking and an interactome is unavailable. This article provides a comprehensive review of the virus-host relationship from viral entry to release, as well as an interactome of cccDNA, HBc, and HBx.
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Affiliation(s)
- Ellen Van Damme
- Janssen Research & Development, Janssen Pharmaceutical Companies, Beerse, Belgium
| | - Jolien Vanhove
- Janssen Research & Development, Janssen Pharmaceutical Companies, Beerse, Belgium.,Early Discovery Biology, Charles River Laboratories, Beerse, Belgium
| | - Bryan Severyn
- Janssen Research & Development, Janssen Pharmaceutical Companies, Springhouse, PA, United States
| | - Lore Verschueren
- Janssen Research & Development, Janssen Pharmaceutical Companies, Beerse, Belgium
| | - Frederik Pauwels
- Janssen Research & Development, Janssen Pharmaceutical Companies, Beerse, Belgium
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3
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Suzuki F, Hosaka T, Imaizumi M, Kobayashi M, Ohue C, Suzuki Y, Fujiyama S, Kawamura Y, Sezaki H, Akuta N, Kobayashi M, Saitoh S, Arase Y, Ikeda K, Kumada H. Potential of ultra-highly sensitive immunoassays for hepatitis B surface and core-related antigens in patients with or without development of hepatocellular carcinoma after hepatitis B surface antigen seroclearance. Hepatol Res 2021; 51:426-435. [PMID: 33270344 DOI: 10.1111/hepr.13602] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 11/16/2020] [Accepted: 11/19/2020] [Indexed: 02/08/2023]
Abstract
AIMS Hepatitis B surface antigen (HBsAg) seroclearance indicates a "functional cure" in chronic hepatitis B (CHB) virus infection. However, several cases of hepatocellular carcinoma (HCC) development have been reported after HBsAg seroclearance. We evaluated the potential of HBsAg and hepatitis B core-related antigen (HBcrAg), measured by the ultra-highly sensitive assays, in cases with HCC development after HBsAg seroclearance. METHODS We enrolled 17 patients with CHB who achieved HBsAg seroclearance, defined by the conventional assay using Architect HBsAg QT kit (five HCC patients and 12 non-HCC patients). HBsAg and HBcrAg were measured in their stored serum samples using ultra-highly sensitive assays featuring "immunoassay for total antigen including complex via pretreatment (iTACT)" technology. RESULTS All five patients who developed HCC were positive for HBsAg or HBcrAg by iTACT-HBsAg or iTACT-HBcrAg at all follow-up points. HBcrAg levels in the HCC group, using iTACT-HBcrAg, were significantly higher than those in the non-HCC group at HBsAg seroclearance (3.6 LogU/ml (2.8-4.2) versus 2.6 (<2.1-3.8), p = 0.020). The best cutoff value of iTACT-HBcrAg for predicting HCC development was 2.7 LogU/ml by receiver operating characteristic curve analysis. The prevalence of HBcrAg ≥2.7 in the HCC group was significantly higher than that in non-HCC group (100% [5/5] versus 33% [4/12], p = 0.029). CONCLUSIONS Residual low viral antigen might predict HCC development even if HBsAg seroclearance was achieved according to a conventional assay. The results suggest that iTACT assays of HBsAg and HBcrAg would be useful for monitoring CHB patients.
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Affiliation(s)
- Fumitaka Suzuki
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | - Tetsuya Hosaka
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | - Masayasu Imaizumi
- Product Development Department, Fujirebio Inc, Hachioji, Tokyo, Japan
| | - Mariko Kobayashi
- Research Institute for Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | - Chiharu Ohue
- Research and Development Department, Advanced Life Science Institute, Inc., Hachioji, Tokyo, Japan
| | - Yoshiyuki Suzuki
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | | | - Yusuke Kawamura
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | - Hitomi Sezaki
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | - Norio Akuta
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | | | - Satoshi Saitoh
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | - Yasuji Arase
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | - Kenji Ikeda
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
| | - Hiromitsu Kumada
- Department of Hepatology, Toranomon Hospital, Minato-ku, Tokyo, Japan
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4
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Zamaraev AV, Zhivotovsky B, Kopeina GS. Viral Infections: Negative Regulators of Apoptosis and Oncogenic Factors. BIOCHEMISTRY (MOSCOW) 2021. [PMID: 33202204 PMCID: PMC7590567 DOI: 10.1134/s0006297920100077] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The disruption of apoptotic cell death process is closely associated with the etiology of various diseases, including cancer. Permanent viral infections can cause different types of cancers. Oncogenic viruses manipulate both external and internal apoptosis pathways, and inhibit the activity of proapoptotic proteins and signaling pathways, which facilitates carcinogenesis. Ineffective immune surveillance or immune response suppression can induce uncontrolled virus propagation and host cell proliferation. In this review, we discuss current data that provide insights into mechanisms of apoptotic death suppression by viruses and their role in oncogenesis.
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Affiliation(s)
- A V Zamaraev
- Faculty of Basic Medicine, Lomonosov Moscow State University, Moscow, 119192, Russia
| | - B Zhivotovsky
- Faculty of Basic Medicine, Lomonosov Moscow State University, Moscow, 119192, Russia.,Institute of Environmental Medicine, Karolinska Institute, Stockholm, SE-171 77, Sweden
| | - G S Kopeina
- Faculty of Basic Medicine, Lomonosov Moscow State University, Moscow, 119192, Russia.
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5
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Ni Z, Lu J, Huang W, Khan H, Wu X, Huang D, Shi G, Niu Y, Huang H. Transcriptomic identification of HBx-associated hub genes in hepatocellular carcinoma. PeerJ 2021; 9:e12697. [PMID: 35036167 PMCID: PMC8710059 DOI: 10.7717/peerj.12697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 12/06/2021] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Hepatocellular carcinoma (HCC) is one of the most common malignancies around the world. Among the risk factors involved in liver carcinogenesis, hepatitis B virus (HBV) X protein (HBx) is considered to be a key regulator in hepatocarcinogenesis. Whether HBx promotes or protects against HCC remains controversial, therefore exploring new HBx-associated genes is still important. METHODS HBx was overexpressed in HepG2, HepG2.2.15 and SMMC-7721 cell lines, primary mouse hepatocytes and livers of C57BL/6N mice. High-throughput RNA sequencing profiling of HepG2 cells with HBx overexpression and related differentially-expressed genes (DEGs), pathway enrichment analysis, protein-protein interaction networks (PPIs), overlapping analysis were conducted. In addition, Gene Expression Omnibus (GEO) and proteomic datasets of HBV-positive HCC datasets were used to verify the expression and prognosis of selected DEGs. Finally, we also evaluated the known oncogenic role of HBx by oncogenic array analysis. RESULTS A total of 523 DEGs were obtained from HBx-overexpressing HepG2 cells. Twelve DEGs were identified and validated in cells transiently transfected with HBx and three datasets of HBV-positive HCC transcription profiles. In addition, using the Kaplan-Meier plotter database, the expression levels of the twelve different genes were further analyzed to predict patient outcomes. CONCLUSION Among the 12 identified HBx-associated hub genes, HBV-positive HCC patients expressing ARG1 and TAT showed a good overall survival (OS) and relapse-free survival (RFS). Thus, ARG1 and TAT expression could be potential prognostic markers.
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Affiliation(s)
- Zhengzhong Ni
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, China
| | - Jun Lu
- Department of Hepatobiliary Surgery, First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Weiyi Huang
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, China
| | - Hanif Khan
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, China
| | - Xuejun Wu
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, China
| | - Danmei Huang
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, China
| | - Ganggang Shi
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, China
| | - Yongdong Niu
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, China
| | - Haihua Huang
- Department of Pathology, Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
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6
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Tang Y, Zhang Y, Wang C, Sun Z, Li L, Dong J, Zhou W. 14-3-3ζ binds to hepatitis B virus protein X and maintains its protein stability in hepatocellular carcinoma cells. Cancer Med 2018; 7:5543-5553. [PMID: 30358169 PMCID: PMC6247021 DOI: 10.1002/cam4.1512] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 03/07/2018] [Accepted: 03/29/2018] [Indexed: 12/17/2022] Open
Abstract
14‐3‐3ζ, a phosphopeptide‐binding molecule, is reportedly overexpressed in the cancerous tissues of patients with hepatocellular carcinoma (HCC). Hepatitis B virus (HBV) protein X (HBx) draws intensive attention in HBV‐related HCC because it not only regulates HBV replication, but also promotes carcinogenesis by interacting with various tumor or antitumor molecules. This study is performed to investigate whether and how 14‐3‐3ζ interacts with HBx. The coimmunoprecipitation (Co‐IP) results showed that 14‐3‐3ζ bond to HBx in HBV‐infected Hep3B HCC cells and CSQT‐2 portal vein tumor thrombosis (PVTT) cells. By performing Co‐IP assay in HBV‐free Huh7 cells expressing wild‐type HBx, mutant HBx‐S31A, or HBx‐S31D (serine31 was mutated into alanine31 or aspartic acid31), we found that the phosphorylated serine31 with its near amino acid residues constituted a RPLphosphoS31GP (R, arginine; P, proline; L, leucine; S, serine; G, glycine) motif in HBx for 14‐3‐3ζ docking. This 14‐3‐3ζ‐HBx interaction was partly impaired when Akt signaling transduction was blocked by LY294002. Furthermore, 14‐3‐3ζ silencing augmented HBx ubiquitination and decreased its expression in cancer cells and xenograft tumor. The migratory and invasive abilities of CSQT‐2 cells were inhibited upon 14‐3‐3ζ silencing, whereas partly restored by HBx overexpression. Additionally, 14‐3‐3ζ positively correlated with HBx to be overexpressed in the primary HCC tissues (r = 0.344) and metastatic PVTT (r = 0.348). In summary, findings of this study reveal a novel 14‐3‐3ζ‐HBx interaction in HCC cells and suggest 14‐3‐3ζ as a candidate target for treating HBV‐related HCC.
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Affiliation(s)
- Yufu Tang
- Department of Hepatobiliary Surgery, The General Hospital of Shenyang Military Area Command, Shenyang, 100016, China.,Post-doctoral Station, The General Hospital of Shenyang Military Area Command, Shenyang, 10016, China
| | - Yibing Zhang
- Department of Hepatobiliary Surgery, The General Hospital of Shenyang Military Area Command, Shenyang, 100016, China
| | - Chunhui Wang
- Department of Hepatobiliary Surgery, The General Hospital of Shenyang Military Area Command, Shenyang, 100016, China
| | - Zhongyi Sun
- Department of Hepatobiliary Surgery, The General Hospital of Shenyang Military Area Command, Shenyang, 100016, China
| | - Longfei Li
- Department of Hepatobiliary Surgery, The General Hospital of Shenyang Military Area Command, Shenyang, 100016, China
| | - Jiahong Dong
- Department of Hepatobiliary and Pancreas Surgery, Beijing Tsinghua Changgung Hospital (BTCH), School of Clinical Medicine, Tsinghua University, Beijing, China
| | - Wenping Zhou
- Department of Hepatobiliary Surgery, The General Hospital of Shenyang Military Area Command, Shenyang, 100016, China
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7
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Zhang Q, Song G, Yao L, Liu Y, Liu M, Li S, Tang H. miR-3928v is induced by HBx via NF-κB/EGR1 and contributes to hepatocellular carcinoma malignancy by down-regulating VDAC3. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2018; 37:14. [PMID: 29378599 PMCID: PMC5789631 DOI: 10.1186/s13046-018-0681-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 01/15/2018] [Indexed: 12/29/2022]
Abstract
BACKGROUND Hepatitis B virus (HBV) plays a critical role in the tumorigenic behavior of human hepatocellular carcinoma (HCC). MicroRNAs (miRNAs) have been reported to participate in HCC development via the regulation of their target genes. However, HBV-modulated miRNAs involved in tumorigenesis remain to be identified. Here, we found that a novel highly expressed miRNA, TLRC-m0008_3p (miR-3928v), may be an important factor that promotes the malignancy of HBV-related HCC. METHODS Solexa sequencing was applied to profile miRNAs, and RT-qPCR was used to identify and quantitate miRNAs. We studied miR-3928v function in HCC cell lines by MTT, colony formation, migration/invasion, and vascular mimicry (VM) assays in vitro and by a xenograft tumor model in vivo. Finally, we predicted and verified the target gene of miR-3928v by a reporter assay, studied the function of this target gene, and cloned the promoter of miR-3928v and the transcription factor for use in dual-luciferase reporter assays and EMSAs. RESULTS A variant of miR-3928 (miR-3928v) was identified and found to be highly expressed in HBV (+) HCC tissues. Voltage-dependent anion channel 3 (VDAC3) was validated as a target of miR-3928v and found to mediate the effects of miR-3928v in promoting HCC growth and migration/invasion. Furthermore, HBx protein increased early growth response 1 (EGR1) expression and facilitated its translocation into the nucleus to enhance miR-3928v promoter activity in an NF-κB signaling-dependent manner. CONCLUSIONS miR-3928v is induced by HBx through the NF-κB/EGR1 signaling pathway and down-regulates the tumor suppressor gene VDAC3 to accelerate the progression of HCC.
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Affiliation(s)
- Qiaoge Zhang
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
| | - Ge Song
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
| | - Lili Yao
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
| | - Yankun Liu
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China ,grid.459483.7The Cancer Institute, Tangshan People’s Hospital, Tangshan, 063001 China
| | - Min Liu
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
| | - Shengping Li
- 0000 0001 2360 039Xgrid.12981.33Department of Hepatobiliary Oncology, State Key Laboratory of Oncology in Southern China, Cancer Center, Sun Yat-sen University, Guangzhou, 510060 China
| | - Hua Tang
- 0000 0000 9792 1228grid.265021.2Tianjin Life Science Research Center and Department of Pathogen Biology, Collaborative Innovation Center of Tianjin for Medical Epigenetics, School of Basic Medical Sciences, Tianjin Medical University, No. 22 Qi-Xiang-Tai Road, Tianjin, 300070 China
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8
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Sengupta I, Das D, Singh SP, Chakravarty R, Das C. Host transcription factor Speckled 110 kDa (Sp110), a nuclear body protein, is hijacked by hepatitis B virus protein X for viral persistence. J Biol Chem 2017; 292:20379-20393. [PMID: 29046350 DOI: 10.1074/jbc.m117.796839] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 10/13/2017] [Indexed: 12/20/2022] Open
Abstract
Promyelocytic leukemia nuclear bodies (PML-NB) are sub-nuclear organelles that are the hub of numerous proteins. DNA/RNA viruses often hijack the cellular factors resident in PML-NBs to promote their proliferation in host cells. Hepatitis B virus (HBV), belonging to Hepadnaviridae family, remains undetected in early infection as it does not induce the innate immune response and is known to be the cause of several hepatic diseases leading to cirrhosis and hepatocellular carcinoma. The association of PML-NB proteins and HBV is being addressed in a number of recent studies. Here, we report that the PML-NB protein Speckled 110 kDa (Sp110) is SUMO1-modified and undergoes a deSUMOylation-driven release from the PML-NB in the presence of HBV. Intriguingly, Sp110 knockdown significantly reduced viral DNA load in the culture supernatant by activation of the type I interferon-response pathway. Furthermore, we found that Sp110 differentially regulates several direct target genes of hepatitis B virus protein X (HBx), a viral co-factor. Subsequently, we identified Sp110 as a novel interactor of HBx and found this association to be essential for the exit of Sp110 from the PML-NB during HBV infection and HBx recruitment on the promoter of these genes. HBx, in turn, modulates the recruitment of its associated transcription cofactors p300/HDAC1 to these co-regulated genes, thereby altering the host gene expression program in favor of viral persistence. Thus, we report a mechanism by which HBV can evade host immune response by hijacking the PML-NB protein Sp110, and therefore, we propose it to be a novel target for antiviral therapy.
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Affiliation(s)
- Isha Sengupta
- From the Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, Kolkata-700064
| | - Dipanwita Das
- the Indian Council of Medical Research (ICMR) Virus Unit, Kolkata, Infectious Diseases and Beliaghata General Hospital Campus, Kolkata 700010, and
| | - Shivaram Prasad Singh
- the Kalinga Gastroenterology Foundation, Beam Diagnostics Premises, Cuttack-753001, India
| | - Runu Chakravarty
- the Indian Council of Medical Research (ICMR) Virus Unit, Kolkata, Infectious Diseases and Beliaghata General Hospital Campus, Kolkata 700010, and
| | - Chandrima Das
- From the Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, Kolkata-700064,
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9
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Interference of Apoptosis by Hepatitis B Virus. Viruses 2017; 9:v9080230. [PMID: 28820498 PMCID: PMC5580487 DOI: 10.3390/v9080230] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 08/07/2017] [Accepted: 08/10/2017] [Indexed: 12/16/2022] Open
Abstract
Hepatitis B virus (HBV) causes liver diseases that have been a consistent problem for human health, leading to more than one million deaths every year worldwide. A large proportion of hepatocellular carcinoma (HCC) cases across the world are closely associated with chronic HBV infection. Apoptosis is a programmed cell death and is frequently altered in cancer development. HBV infection interferes with the apoptosis signaling to promote HCC progression and viral proliferation. The HBV-mediated alteration of apoptosis is achieved via interference with cellular signaling pathways and regulation of epigenetics. HBV X protein (HBX) plays a major role in the interference of apoptosis. There are conflicting reports on the HBV interference of apoptosis with the majority showing inhibition of and the rest reporting induction of apoptosis. In this review, we described recent studies on the mechanisms of the HBV interference with the apoptosis signaling during the virus infection and provided perspective.
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10
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Development of Lateral Flow Assay Based on Size-Controlled Gold Nanoparticles for Detection of Hepatitis B Surface Antigen. SENSORS 2016; 16:s16122154. [PMID: 27999291 PMCID: PMC5191134 DOI: 10.3390/s16122154] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 11/30/2016] [Accepted: 12/12/2016] [Indexed: 12/14/2022]
Abstract
In this study, we developed lateral flow assay (LFA) biosensors for the detection of hepatitis B surface antigens using well-controlled gold nanoparticles (AuNPs). To enhance colorimetric signals, a seeded growth method was used for the preparation of size-controlled AuNPs with a narrow size distribution. Different sizes of AuNPs in the range of 342–137.8 nm were conjugated with antibodies and then optimized for the efficient detection of LFA biosensors. The conjugation stability was investigated by UV-vis spectroscopy of AuNP dispersion at various pH values and concentrations of antibody. Based on optimized conjugation conditions, the use of 42.7 ± 0.8 nm AuNPs exhibited superior performance for the detection of LFAs relative to other sizes of AuNPs.
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11
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Fu S, Zhou RR, Li N, Huang Y, Fan XG. Hepatitis B virus X protein in liver tumor microenvironment. Tumour Biol 2016; 37:10.1007/s13277-016-5406-2. [PMID: 27658781 PMCID: PMC5250643 DOI: 10.1007/s13277-016-5406-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 09/13/2016] [Indexed: 12/18/2022] Open
Abstract
Encoded by the hepatitis B virus, hepatitis B virus X protein (HBx) is a multifunctional, potentially oncogenic protein that acts primarily during the progression from chronic hepatitis B to cirrhosis and hepatocellular carcinoma (HCC). In recent decades, it has been established that chronic inflammation generates a tumor-supporting microenvironment. HCC is a typical chronic inflammation-related cancer, and inflammation is the main risk factor for HCC progression. The viral transactivator HBx plays a pivotal role in the initiation and maintenance of hepatic inflammatory processes through interactions with components of the tumor microenvironment including tumor cells and the surrounding peritumoral stroma. The complex interactions between HBx and this microenvironment are thought to regulate tumor growth, progression, invasion, metastasis, and angiogenesis. In this review, we have summarized the current evidence evaluating the function of HBx and its contribution to the inflammatory liver tumor microenvironment.
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Affiliation(s)
- Sha Fu
- Department of Infectious Diseases, Key Laboratory of Viral Hepatitis of Hunan Province, Xiangya Hospital, Central South University, P. O. Box: 410008, Changsha, China
| | - Rong-Rong Zhou
- Department of Infectious Diseases, Key Laboratory of Viral Hepatitis of Hunan Province, Xiangya Hospital, Central South University, P. O. Box: 410008, Changsha, China.
| | - Ning Li
- Department of Blood Transfusion, Xiangya Hospital, Central South University, Changsha, China
| | - Yan Huang
- Department of Infectious Diseases, Key Laboratory of Viral Hepatitis of Hunan Province, Xiangya Hospital, Central South University, P. O. Box: 410008, Changsha, China
| | - Xue-Gong Fan
- Department of Infectious Diseases, Key Laboratory of Viral Hepatitis of Hunan Province, Xiangya Hospital, Central South University, P. O. Box: 410008, Changsha, China.
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12
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Hu WY, Yao CL. Molecular and immune response characterizations of a novel AIF and cytochrome c in Litopenaeus vannamei defending against WSSV infection. FISH & SHELLFISH IMMUNOLOGY 2016; 56:84-95. [PMID: 27368536 DOI: 10.1016/j.fsi.2016.06.050] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 06/22/2016] [Accepted: 06/27/2016] [Indexed: 06/06/2023]
Abstract
Apoptosis inducing factor (AIF) and cytochrome c (CYC) are two mitochondrial apoptogenic factors. In the present study, the cDNA sequences of AIF (LvAIF) and CYC (LvCYC) were cloned from Pacific white shrimp, Litopenaeus vannamei. The LvAIF was 1664 bp, including a 5'-terminal untranslated region (UTR) of 154 bp, an open reading frame (ORF) of 1323 bp encoding a polypeptide of 440 amino acids (aa) and a 3' UTR of 187 bp. The LvCYC was 582 bp, including a 50 bp 5' UTR, a 315 bp ORF encoding for 104 aa, and a 217 bp 3' UTR. The deduced protein of LvAIF contained a conserved Pyr_redox and AIF_C domain at the N-terminal and the predicted LvCYC included a conservative cytochrome_C domain, respectively. Phylogenetic analysis revealed that LvAIF belonged to AIF1 subfamily and showed a close relationship with AIF1 from vertebrates and LvCYC showed the closest relationship with its counterparts from shrimp Marsupenaeus japonicus. Tissue expression profiles showed that both LvAIF and LvCYC existed in most tissues, with the most predominant expression of LvAIF in intestine, then followed muscle and the weakest expression in gill. The highest expression of LvCYC was detected in muscle, and the weakest expression was in hemocytes. Additionally, after white spot syndrome virus (WSSV) infection, the significant up-regulation of LvAIF, LvCYC and caspase 3 transcripts and the increase of pro-caspase 3 and active-caspase 3 protein were detected at most time points (P < 0.05). However, all of the three genes down-regulated in hemocytes in the early stage after WSSV infection. WSSV proliferation and shrimp mortality showed a time-dependent manner and the production of ROS in hemocytes were significantly increased at 6 and 24 h after infection. Our results showed that the apoptotic genes AIF, CYC and caspase 3 might play crucial roles in hepatopancreas, however, the production of ROS in hemocytes might be important in shrimp defense against WSSV infection.
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Affiliation(s)
- Wen-Yan Hu
- Fisheries College, Jimei University, Xiamen, 361021, PR China
| | - Cui-Luan Yao
- Fisheries College, Jimei University, Xiamen, 361021, PR China.
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13
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Yu Y, Wei S, Wang Z, Huang X, Huang Y, Cai J, Li C, Qin Q. Establishment of a new cell line from the snout tissue of golden pompano Trachinotus ovatus, and its application in virus susceptibility. JOURNAL OF FISH BIOLOGY 2016; 88:2251-62. [PMID: 27146361 DOI: 10.1111/jfb.12986] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 03/03/2016] [Indexed: 05/27/2023]
Abstract
A new marine-fish cell line, designated GPS, was established from the snout tissue of golden pompano Trachinotus ovatus. GPS cells multiplied well in Leibovitz's L-15 containing 10% foetal bovine serum (FBS) at 28° C and the cells have been subcultured for >60 passages. Polymerase chain reaction (PCR) amplification of 16S ribosomal (r)RNA confirmed the origin of this cell line from T. ovatus. Chromosome analysis showed that GPS cells exhibited chromosomal aneuploidy with a modal chromosome number of 54. Bright green fluorescence signal was observed in enhanced green fluorescent protein (EGFP)-N3 transfected cells, indicating that GPS cells could be used to investigate gene functions in vitro. The GPS cells were highly susceptible to Singapore grouper iridovirus (SGIV), which was demonstrated by the presence of severe cytopathic effect (CPE) and increased viral titres. Real-time quantitative PCR and Western blot analysis showed that the viral gene transcription and protein synthesis occurred during SGIV infection in GPS cells. Thus, this study described the characteristic of a new cell line from the snout tissue of T. ovatus that could be used as a tool for propagation of iridovirus and genetic manipulation to investigate host-pathogen interactions.
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Affiliation(s)
- Y Yu
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - S Wei
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Z Wang
- College of Ecological Environment Engineering, Qinghai University, Xining, 810016, China
| | - X Huang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Y Huang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - J Cai
- Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Guangdong Ocean University, Zhanjiang, 524088, China
| | - C Li
- College of Ecological Environment Engineering, Qinghai University, Xining, 810016, China
| | - Q Qin
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510641, China
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14
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Han J, Zhang M, Froese S, Dai FF, Robitaille M, Bhattacharjee A, Huang X, Jia W, Angers S, Wheeler MB, Wei L. The Identification of Novel Protein-Protein Interactions in Liver that Affect Glucagon Receptor Activity. PLoS One 2015; 10:e0129226. [PMID: 26075596 PMCID: PMC4468146 DOI: 10.1371/journal.pone.0129226] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 05/06/2015] [Indexed: 11/18/2022] Open
Abstract
Glucagon regulates glucose homeostasis by controlling glycogenolysis and gluconeogenesis in the liver. Exaggerated and dysregulated glucagon secretion can exacerbate hyperglycemia contributing to type 2 diabetes (T2D). Thus, it is important to understand how glucagon receptor (GCGR) activity and signaling is controlled in hepatocytes. To better understand this, we sought to identify proteins that interact with the GCGR to affect ligand-dependent receptor activation. A Flag-tagged human GCGR was recombinantly expressed in Chinese hamster ovary (CHO) cells, and GCGR complexes were isolated by affinity purification (AP). Complexes were then analyzed by mass spectrometry (MS), and protein-GCGR interactions were validated by co-immunoprecipitation (Co-IP) and Western blot. This was followed by studies in primary hepatocytes to assess the effects of each interactor on glucagon-dependent glucose production and intracellular cAMP accumulation, and then in immortalized CHO and liver cell lines to further examine cell signaling. Thirty-three unique interactors were identified from the AP-MS screening of GCGR expressing CHO cells in both glucagon liganded and unliganded states. These studies revealed a particularly robust interaction between GCGR and 5 proteins, further validated by Co-IP, Western blot and qPCR. Overexpression of selected interactors in mouse hepatocytes indicated that two interactors, LDLR and TMED2, significantly enhanced glucagon-stimulated glucose production, while YWHAB inhibited glucose production. This was mirrored with glucagon-stimulated cAMP production, with LDLR and TMED2 enhancing and YWHAB inhibiting cAMP accumulation. To further link these interactors to glucose production, key gluconeogenic genes were assessed. Both LDLR and TMED2 stimulated while YWHAB inhibited PEPCK and G6Pase gene expression. In the present study, we have probed the GCGR interactome and found three novel GCGR interactors that control glucagon-stimulated glucose production by modulating cAMP accumulation and genes that control gluconeogenesis. These interactors may be useful targets to control glucose homeostasis in T2D.
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Affiliation(s)
- Junfeng Han
- Department of Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada
- Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China
| | - Ming Zhang
- Department of Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Sean Froese
- Department of Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Feihan F. Dai
- Department of Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Mélanie Robitaille
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, M5S1A8, Canada
| | - Alpana Bhattacharjee
- Department of Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Xinyi Huang
- Department of Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Weiping Jia
- Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China
| | - Stéphane Angers
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, M5S1A8, Canada
| | - Michael B. Wheeler
- Department of Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada
- * E-mail: (MW); (LW)
| | - Li Wei
- Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai, China
- * E-mail: (MW); (LW)
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15
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Alvarez-Sanchez C, Cancio-Lonches C, Mora-Heredia JE, Santos-Valencia JC, Barrera-Vázquez OS, Yocupicio-Monroy M, Gutiérrez-Escolano AL. Negative effect of heat shock on feline calicivirus release from infected cells is associated with the control of apoptosis. Virus Res 2015; 198:44-52. [DOI: 10.1016/j.virusres.2015.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Revised: 12/22/2014] [Accepted: 01/07/2015] [Indexed: 02/07/2023]
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16
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Targeting the Achilles heel of the hepatitis B virus: a review of current treatments against covalently closed circular DNA. Drug Discov Today 2015; 20:548-61. [PMID: 25622780 DOI: 10.1016/j.drudis.2015.01.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 12/15/2014] [Accepted: 01/14/2015] [Indexed: 01/05/2023]
Abstract
Chronic infection with hepatitis B virus (HBV) often leads to the development of liver cancer and cirrhosis, creating immense sociological, clinical and economic burdens worldwide. Although current anti-HBV medications manage to control the disease progression and help restore normal liver functions, they often fail to eliminate the virus completely. A major reason for this failure is the presence of a stable viral genome in the hepatocyte nucleus: the covalently closed circular DNA (cccDNA). Targeting HBV cccDNA is a promising approach that could lead to a complete cure. Here, we review various research approaches that are directed toward eliminating HBV cccDNA. This is a brief, yet comprehensive, summary of current state-of-the-art developments in this emerging area of interest.
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17
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Zhu W, Zhu N, Bai D, Miao J, Zou S. The crosstalk between Dectin1 and TLR4 via NF-κB subunits p65/RelB in mammary epithelial cells. Int Immunopharmacol 2014; 23:417-25. [DOI: 10.1016/j.intimp.2014.09.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 09/03/2014] [Accepted: 09/05/2014] [Indexed: 01/28/2023]
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18
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Zou C, Chen J, Chen K, Wang S, Cao Y, Zhang J, Sheng Y, Huang A, Tang H. Functional analysis of miR-181a and Fas involved in hepatitis B virus-related hepatocellular carcinoma pathogenesis. Exp Cell Res 2014; 331:352-61. [PMID: 25449696 DOI: 10.1016/j.yexcr.2014.11.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 11/12/2014] [Accepted: 11/13/2014] [Indexed: 01/05/2023]
Abstract
The hepatitis B virus (HBV) is responsible for most of hepatocellular carcinoma (HCC). However, whether HBV plays an important role during hepatocarcinogenesis through effecting miRNAs remains unknown. Here, we reported that HBV up-regulated microRNA-181a (miR-181a) by enhancing its promoter activity. Simultaneously, we found that miR-181a inhibited apoptosis in vitro and promoted tumor cell growth in vivo. TNF receptor superfamily member 6 (Fas) was further identified as a target of miR-181a. We also found that Fas could reverse the apoptosis-inhibition effect induced by miR-181a. Moreover, HBV could inhibit cell apoptosis by down-regulating Fas expression, which could be reversed by miR-181a inhibitor. Our data demonstrated that HBV suppressed apoptosis of hepatoma cells by up-regulating miR-181a expression and down-regulating Fas expression, which may provide a new understanding of the mechanism in HBV-related HCC pathogenesis.
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Affiliation(s)
- Chengcheng Zou
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China
| | - Juan Chen
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China
| | - Ke Chen
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China
| | - Sen Wang
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China
| | - Yiyi Cao
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China
| | - Jinnan Zhang
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China
| | - Yanrui Sheng
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China
| | - Ailong Huang
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China
| | - Hua Tang
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China.
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19
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Yuan Y, Tian C, Gong Q, Shang L, Zhang Y, Jin C, He F, Wang J. Interactome map reveals phospholipid scramblase 1 as a novel regulator of hepatitis B virus x protein. J Proteome Res 2014; 14:154-63. [PMID: 25365352 DOI: 10.1021/pr500943x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
HBV X protein plays crucial roles during viral infection and hepatocellular carcinoma (HCC) development through interaction with various host factors. Here, we mapped the interactome of HBx using a yeast two-hybrid screen. Nine human proteins were identified as novel interacting partners of HBx, one of which is phospholipid scramblase 1 (PLSCR1). PLSCR1 is an interferon-inducible protein that mediates antiviral activity against DNA and RNA viruses. However, the molecular mechanisms of PLSCR1 activity against HBV remain unclear. Here, we reported that PLSCR1 promotes HBx degradation by a proteasome- and ubiquitin-dependent mechanism. Furthermore, we found that PLSCR1 inhibits HBx-mediated cell proliferation. After HBV infection, the protein level of PLSCR1 in plasma is elevated, and chronic hepatitis B patients with low plasma levels of PLSCR1 have a high risk of developing HCC. These results suggest that the nuclear trafficking of PLSCR1 mediates the antiviral activity and anticarcinogenesis against HBV by regulating HBx stability.
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Affiliation(s)
- Yanzhi Yuan
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine , Beijing 102206, China
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20
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Feitelson MA, Bonamassa B, Arzumanyan A. The roles of hepatitis B virus-encoded X protein in virus replication and the pathogenesis of chronic liver disease. Expert Opin Ther Targets 2014; 18:293-306. [PMID: 24387282 DOI: 10.1517/14728222.2014.867947] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
INTRODUCTION Hepatitis B virus (HBV) is a major cause of chronic liver disease (CLD) and hepatocellular carcinoma (HCC) worldwide. More than 350 million people are at risk for HCC, and with few treatment options available, therapeutic approaches to targets other than the virus polymerase will be needed. This review suggests that the HBV-encoded X protein, HBx, would be an outstanding target because it contributes to the biology and pathogenesis of HBV in three fundamental ways. AREAS COVERED First, HBx is a trans-activating protein that stimulates virus gene expression and replication, thereby promoting the development and persistence of the carrier state. Second, HBx partially blocks the development of immune responses that would otherwise clear the virus, and protects infected hepatocytes from immune-mediated destruction. Thus, HBx contributes to the development of CLD without virus clearance. Third, HBx alters patterns of host gene expression that make possible the emergence of HCC. The selected literature cited is from the National Library of Medicine (Pubmed and Medline). EXPERT OPINION Understanding the mechanisms, whereby HBx supports virus replication and promotes pathogenesis, suggests that HBx will be an important therapeutic target against both virus replication and CLD aimed at the chemoprevention of HCC.
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Affiliation(s)
- Mark A Feitelson
- Temple University, College of Science and Technology, Department of Biology , Room 409 BioLife Science Building, 1900 N. 12th Street, Philadelphia, PA 19122 , USA +1 215 204 8434 ; +1 215 204 8359 ;
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21
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Xie N, Chen X, Zhang T, Liu B, Huang C. Using proteomics to identify the HBx interactome in hepatitis B virus: how can this inform the clinic? Expert Rev Proteomics 2013; 11:59-74. [PMID: 24308553 DOI: 10.1586/14789450.2014.861745] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Hepatitis B virus (HBV) is a small and enveloped DNA virus, of which chronic infection is the main risk factor of liver cirrhosis and hepatocellular carcinoma. Hepatitis B virus X protein (HBx) is a multifunctional protein encoded by HBV genome, which have significant effects on HBV replication and pathogenesis. Through directly interacting with cellular proteins, HBx is capable to promote HBV replication, regulate transcription of host genes, disrupt protein degradation, modulate signaling pathway, manipulate cell death and deregulate cell cycle. In this review, we briefly discuss the diversified effects of HBx-interactome and their potential clinical significances.
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Affiliation(s)
- Na Xie
- The State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, 610041, P.R. China
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22
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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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23
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Xu C, Zhou W, Wang Y, Qiao L. Hepatitis B virus-induced hepatocellular carcinoma. Cancer Lett 2013; 345:216-22. [PMID: 23981576 DOI: 10.1016/j.canlet.2013.08.035] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 08/10/2013] [Accepted: 08/18/2013] [Indexed: 12/12/2022]
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 signal pathways that associated with cell proliferation and apoptosis, and the impact of HBx C-terminal truncation in the development of HCC has been implicated. Recent studies by advanced sequencing technologies have revealed recurrent HBV DNA integration sites in hepatoma cells and susceptible genes/SNPs play an important role in the pathogenesis of liver cancer. Epigenetic changes, immune and inflammatory factors are also important contributing factors for liver cancer. This mini-review provides an overview on the recent development of HBV induced HCC.
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Affiliation(s)
- Cheng Xu
- Institute for Infectious Diseases, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Wence Zhou
- The Department of General Surgery II, The First Hospital of Lanzhou University, Lanzhou 730000, Gansu Province, China
| | - Yuming Wang
- Institute for Infectious Diseases, Southwest Hospital, Third Military Medical University, Chongqing 400038, China.
| | - Liang Qiao
- Storr Liver Unit, University of Sydney, Westmead Millennium Institute, Westmead Hospital, Westmead, NSW 2145, Australia.
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Shen L, Zhang X, Hu D, Feng T, Li H, Lu Y, Huang J. Hepatitis B virus X (HBx) play an anti-apoptosis role in hepatic progenitor cells by activating Wnt/β-catenin pathway. Mol Cell Biochem 2013; 383:213-22. [PMID: 23934090 DOI: 10.1007/s11010-013-1769-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Accepted: 08/02/2013] [Indexed: 12/16/2022]
Abstract
Increasing evidence has shown that normal stem cells may act as cancer-initiating cells and contribute to the development and progression of cancer. HBx has a close relationship with hepatocellular carcinoma, however, the role of HBx in hepatic progenitor cells (HPCs) is poorly understood. In this study, we sought to determine the role of HBx in regulating HPCs apoptosis and the underlying molecular mechanism(s) using HPCs derived from mouse fetal liver. The apoptotic ratio of HPCs infected with adenovirus-expressing HBx (Ad-HBx) was examined using flow cytometry. Results showed that the Ad-HBx treatment led to substantially decreased apoptotic ratio of HPCs, as confirmed by the Hoechst 33342 staining and terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL). Possible alterations of relative proteins were examined using Western blot and real-time PCR assays. The HBx expression in HPCs increased the expression levels of Bcl2 and Mcl1 while decreasing the expression levels of Bax and cleaved caspase-9 and -3. In addition, the mRNA and protein expression levels of β-catenin were both increased. The β-catenin protein were mainly accumulated in cytoplasm and tended to transfer into cell nucleus after Ad-HBx treatment. The over-expression of β-catenin decreased the apoptotic ratio of HPCs and inhibited the expression of cleaved caspase-9 and -3 while blocking β-catenin expression resulted in the opposite results. Taken together, our results strongly suggested that the HBx protein may inhibits apoptosis of hepatic progenitor cells, at least in part by activating the WNT/β-catenin pathway. This provided a new insight into the molecular mechanism of HBx-mediated live carcinogenesis.
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Affiliation(s)
- Lihong Shen
- Molecular Medicine and Cancer Research Center, Chongqing Medical University, Chongqing, 400016, People's Republic of China
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25
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Li W, Zhu MY, Lu Y, Zhu LQ, Dong X, Chen Y, Li MS. Construction and identification of a green fluorescent protein expression vector carrying the HBx gene (pHBx-EGFP) and its expression in hepatocellular carcinoma cell line Bel 7402. Shijie Huaren Xiaohua Zazhi 2013; 21:2016-2022. [DOI: 10.11569/wcjd.v21.i21.2016] [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
AIM: To construct an eukaryotic expression vector carrying hepatitis B virus X (HBx) gene and enhanced green fluorescent protein gene (pHBx-EGFP), and to express it transiently in hepatocellular carcinoma (HCC) Bel 7402 cells for observing the expression and cellular localization of HBx-EGFP fusion protein and providing an experimental tool for investigating the function of HBx gene.
METHODS: pcDNA3.1-HBx was used to amplify the HBx gene fragment by polymerase chain reaction (PCR). Recombinant DNA technology was used to insert the HBx gene into the eukaryotic expression vector pEGFP to obtain a recombinant vector pHBx-EGFP. After the recombinant vector or pEGFP was transfected into Bel 7402 cells for 24 h, the expression and subcellular location of HBx-EGFP was detected under an inverted fluorescence microscope, and the expression of HBx protein in total cellular proteins was detected by Western blot.
RESULTS: Restriction digestion and DNA sequence analyses verified that the recombinant plasmid was constructed successfully. After the HBx-EGFP recombinant plasmid was transfected into Bel 7402 cells, it was found that HBx-EGFP was present in the perinuclear region, while EGFP was distributed throughout the cells. Western blot analysis demonstrated that EGFP and HBx were expressed efficiently.
CONCLUSION: A recombinant eukaryotic fluorescent expression vector carrying the HBx gene (pHBx-EGFP) has been constructed successfully, which could express EGFP and HBx in Bel 7402 cells.
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Liu B, Wen X, Huang C, Wei Y. Unraveling the complexity of hepatitis B virus: from molecular understanding to therapeutic strategy in 50 years. Int J Biochem Cell Biol 2013; 45:1987-96. [PMID: 23819994 DOI: 10.1016/j.biocel.2013.06.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Revised: 06/18/2013] [Accepted: 06/21/2013] [Indexed: 02/05/2023]
Abstract
Hepatitis B virus (HBV) is a well-known hepadnavirus with a double-stranded circular DNA genome. Although HBV was first described approximately 50 years ago, the precise mechanisms of HBV infection and effective therapeutic strategies remain unclear. Here, we focus on summarizing the complicated mechanisms of HBV replication and infection, as well as genomic factors and epigenetic regulation. Additionally, we discuss in vivo models of HBV, as well as diagnosis, prevention and therapeutic drugs for HBV. Together, the data in this 50-year review may provide new clues to elucidate molecular mechanisms of HBV pathogenesis and shed new light on the future HBV therapies.
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Affiliation(s)
- Bo Liu
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China
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27
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Miteva YV, Budayeva HG, Cristea IM. Proteomics-based methods for discovery, quantification, and validation of protein-protein interactions. Anal Chem 2013; 85:749-68. [PMID: 23157382 PMCID: PMC3666915 DOI: 10.1021/ac3033257] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Ileana M. Cristea
- Corresponding author: Ileana M. Cristea 210 Lewis Thomas Laboratory Department of Molecular Biology Princeton University Princeton, NJ 08544 Tel: 6092589417 Fax: 6092584575
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