scholarly journals Anti-oncogene PTPN13 inactivation by hepatitis B virus X protein counteracts IGF2BP1 to promote hepatocellular carcinoma progression

Oncogene ◽  
2020 ◽  
Vol 40 (1) ◽  
pp. 28-45 ◽  
Author(s):  
Yongcong Yan ◽  
Pinbo Huang ◽  
Kai Mao ◽  
Chuanchao He ◽  
Qiaodong Xu ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Tyrosine Phosphatase ◽  
Cellular Protein ◽  
Metabolic Reprogramming ◽  
X Protein ◽  
B Virus

AbstractHepatitis B x protein (HBx) affects cellular protein expression and participates in the tumorigenesis and progression of hepatitis B virus (HBV)-related hepatocellular carcinoma (HCC). Metabolic reprogramming contributed to the HCC development, but its role in HBV-related HCC remains largely unclear. Tyrosine-protein phosphatase nonreceptor type 13 (PTPN13) is a significant regulator in tumor development, however, its specific role in hepatocarcinogenesis remains to be explored. Here, we found that decreased PTPN13 expression was associated with HBV/HBx. Patients with low PTPN13 expression showed a poor prognosis. Functional assays revealed that PTPN13 inhibited proliferation and tumorigenesis in vitro and in vivo. Further mechanistic studies indicated that HBx inhibited PTPN13 expression by upregulating the expression of DNMT3A and interacting with DNMT3A. Furthermore, we found that DNMT3A bound to the PTPN13 promoter (−343 to −313 bp) in an epigenetically controlled manner associated with elevated DNA methylation and then inhibited PTPN13 transcription. In addition, we identified IGF2BP1 as a novel PTPN13-interacting gene and demonstrated that PTPN13 influences c-Myc expression by directly and competitively binding to IGF2BP1 to decrease the intracellular concentration of functional IGF2BP1. Overexpressing PTPN13 promoted c-Myc mRNA degradation independent of the protein tyrosine phosphatase (PTP) activity of PTPN13. Importantly, we discovered that the PTPN13-IGF2BP1-c-Myc axis was important for cancer cell growth through promoting metabolic reprogramming. We verified the significant negative correlations between PTPN13 expression and c-Myc, PSPH, and SLC7A1 expression in clinical HCC tissue samples. In summary, our findings demonstrate that PTPN13 is a novel regulator of HBV-related hepatocarcinogenesis and may play an important role in HCC. PTPN13 may serve as a prognostic marker and therapeutic target in HBV-related HCC patients.

Hepatitis B virus X protein promotes proliferation of hepatocellular carcinoma cells by upregulating miR-181b by targeting ING5

2018 ◽  
Vol 399 (6) ◽  
pp. 611-619 ◽  
Author(s):  
Xuhua Xie ◽  
Xiaopei Xu ◽  
Changyu Sun ◽  
Zujiang Yu
Keyword(s):  
Hepatocellular Carcinoma ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Cell Lines ◽  
Tumor Model ◽  
Luciferase Reporter ◽  
X Protein ◽  
B Virus

Abstract Hepatitis B virus X protein (HBx) played a key role in the development of hepatitis B virus (HBV)-related hepatocellular carcinoma (HCC). Emerging evidence has demonstrated that miR-181b and the inhibitor of growth protein 5 (ING5) participated in the pathophysiological process. However, the regulatory mechanism of HBx remained unknown. The expression of miR-181b and ING5 in HCC tissues and cell lines were examined using quantitative real-time polymerase chain reaction (qRT-PCR) and Western blotting. Cell viability was determined using the MTT method following HCC cell lines transfection. The interaction between miR-181b and ING5 was assessed by luciferase reporter assay. The nude mice tumor model was well established to evaluate the role and biological functions of HBx on the progression of HBV-related HCC in vivo. MiR-181b was upregulated and ING5 was downregulated in HCC tissues and cell lines. As suggested by the results from in vitro and in vivo experiments, HBx downregulates the expression of the miR-181b target gene ING5, resulting in the promotion of HCC cell proliferation. HBx accelerates proliferation activity of HCC cells by increasing miR-181b expression via targeting ING5, thereby influencing the progression of HBV-related HCC.

scholarly journals In Vitro and In Vivo Interactions between the Hepatitis B Virus Protein P22 and the Cellular Protein gC1qR

2003 ◽  
Vol 77 (23) ◽  
pp. 12875-12880 ◽  
Author(s):  
S. Lainé ◽  
A. Thouard ◽  
J. Derancourt ◽  
M. Kress ◽  
D. Sitterlin ◽  
...  
Keyword(s):  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Matrix Protein ◽  
Cellular Protein ◽  
Virus Protein ◽  
B Virus ◽  
Immunofluorescence Studies ◽  
Cellular Partner

ABSTRACT gC1qR, a mitochondrial matrix protein, was identified as the main cellular partner of the hepatitis B virus P22 protein. We demonstrated by immunofluorescence studies that some P22 molecules were colocalized with the endogenous gC1qR in both the cytoplasm and the nucleus but never in the mitochondria. We also showed that the last 34 amino acids of P22 were involved in the association with gC1qR.

scholarly journals Role and Functional Domain of Hepatitis B Virus X Protein in Regulating HBV Transcription and Replication in Vitro and in Vivo

Viruses ◽  
2013 ◽  
Vol 5 (5) ◽  
pp. 1261-1271 ◽  
Author(s):  
Dao-Yin Gong ◽  
En-Qiang Chen ◽  
Fei-Jun Huang ◽  
Xiao-Hua Leng ◽  
Xing Cheng ◽  
...  
Keyword(s):  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Functional Domain ◽  
X Protein ◽  
B Virus ◽  
Transcription And Replication

scholarly journals Stimulation of Cellular Proliferation by Hepatitis B Virus X Protein

2001 ◽  
Vol 17 (3) ◽  
pp. 153-157 ◽  
Author(s):  
Charles R. Madden ◽  
Betty L. Slagle
Keyword(s):  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Cellular Proliferation ◽  
X Protein ◽  
Hepatitis Viruses ◽  
B Virus ◽  
Infected Cells ◽  
Proliferation In Vitro

Chronic infection with the hepatitis B virus (HBV) is a known risk factor in the development of human hepatocellular carcinoma (HCC). The HBV-encoded X protein, HBx, has been investigated for properties that may explain its cancer cofactor role in transgenic mouse lines. We discuss here recent data showing that HBx is able to induce hepatocellular proliferation in vitro and in vivo. This property of HBx is predicted to sensitize hepatocytes to other HCC cofactors, including exposure to carcinogens and to other hepatitis viruses. Cellular proliferation is intimately linked to the mechanism(s) by which most tumor-associated viruses transform virus-infected cells. The HBx alteration of the cell cycle provides an additional mechanism by which chronic HBV infection may contribute to HCC.

scholarly journals TLR4 Influences Hepatitis B Virus Related Hepatocellular Carcinoma by Regulating the Wnt/β-Catenin Pathway

2017 ◽  
Vol 42 (2) ◽  
pp. 469-479 ◽  
Author(s):  
Yuanqin Yin ◽  
Fei Li ◽  
Songlin Li ◽  
Jingjing Cai ◽  
Jing Shi ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Cell Apoptosis ◽  
Migration And Invasion ◽  
Control Group ◽  
B Virus ◽  
Sirna Group

Background/Aims: We investigated the correlation between toll-like receptor 4 (TLR4) and β-catenin for disclosing the potential pathogenesis of hepatocellular carcinoma (HCC). Methods: Immunohistochemical toolkit was implemented to measure the expression of TLR4 and β-catenin in 98 cases of HCC tissues and adjacent tissues. After setting up the HepG2.2.15 hepatitis B virus (HBV) related HCC cell line, we divided the cells into the control group, TLR4 siRNA group, β-catenin siRNA group, and pcDNA.3.1 TLR4 + β-catenin siRNA group. Western blot, CCK-8 method, Transwell and flow cytometry were used to detect protein expression, cell proliferation, cell migration and invasion as well as cell apoptosis, respectively. Nude mice tumor model was established to observe the effects of TLR4 and β-catenin on the progression of HBV-related HCC in vivo. Results:The positive rates of TLR4 and β-catenin were higher in HCC tissues compared with normal tissues. Both the TLR4 siRNA group and β-catenin siRNA group exhibited a decreased expression of β-catenin. The proliferation, migration and invasion of tumor cells in the above two groups were suppressed, while the cell apoptosis appeared to be stimulated. As suggested by the results from in vivo and in vitro experiments, the up-regulation of TLR4 could antagonize the corresponding effect of β-catenin siRNA. Conclusions: TLR4 can affect the expression of β-catenin and hence influence the progression of HBV-related HCC.

scholarly journals Hepatitis B Virus Pre-S Mutants as Biomarkers and Targets for the Development and Recurrence of Hepatocellular Carcinoma

Viruses ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 945 ◽  
Author(s):  
Chiao-Fang Teng ◽  
Han-Chieh Wu ◽  
Ih-Jen Su ◽  
Long-Bin Jeng
Keyword(s):  
Hepatocellular Carcinoma ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Hbv Infection ◽  
Signal Pathways ◽  
Recurrence Rates ◽  
Chronic Hepatitis B Virus ◽  
B Virus

Chronic hepatitis B virus (HBV) infection is a major risk factor for the development of hepatocellular carcinoma (HCC), the leading cause of cancer-related death worldwide. Despite progress in the prevention and therapy of HCC, high incidence and recurrence rates of HCC remain big threats, resulting in poor patient survival. Effective biomarkers and targets of HCC are therefore urgently needed for better management and to improve patient outcomes. Pre-S mutants have been well demonstrated as HBV oncoproteins that play important roles in HCC development through activation of multiple oncogenic signal pathways in hepatocytes, in vitro and in vivo. The presence of pre-S mutants in patients with chronic HBV infection and HBV-related HCC has been associated with a significantly higher risk of HCC development and recurrence after curative surgical resection, respectively. In this review, we summarize the roles of pre-S mutants as biomarkers for predicting HBV-related HCC development and recurrence, and highlight the pre-S mutants-activated oncogenic signal pathways as potential targets for preventing HBV-related HCC development.

scholarly journals Different Regions of Hepatitis B Virus X Protein Are Required for Enhancement of bZip-Mediated Transactivation versus Transrepression

2000 ◽  
Vol 74 (1) ◽  
pp. 83-90 ◽  
Author(s):  
Sangeeta Barnabas ◽  
Ourania M. Andrisani
Keyword(s):  
Amino Acid ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Deletion Mutants ◽  
Amino Acid Residues ◽  
X Protein ◽  
Amino Acid Region ◽  
B Virus

ABSTRACT The hepatitis B virus X protein (pX) interacts directly with the bZip transactivator CREB and the bZip repressors ICERIIγ and ATF3, increasing their DNA-binding affinity in vitro and their transcriptional efficacy in vivo. However, the mechanism of bZip-pX interaction and of the pX-mediated increase in the bZip transcriptional efficacy remains to be understood. In this study with deletion mutants of pX, we delineated a 67-amino-acid region spanning residues 49 to 115 required for direct CREB, ATF3, and ICER IIγ interaction in vitro and in vivo and increased bZip/CRE binding in vitro. Transient transfections of the pX deletion mutants in AML12 hepatocytes demonstrate that pX49–115 is as effective as the full-length pX in enhancing the ATF3- and ICERIIγ-mediated transrepression. However, this pX region is inactive in increasing the transactivation efficacy of CREB; additional amino acid residues present in pX49–140are required to mediate the increased transactivation efficacy of CREB in vivo. This requirement for different regions of pX in affecting CREB transactivation suggests that amino acid residues 115 to 140 integrate additional events in effecting pX-mediated transactivation, such as concomitant interactions with select components of the basal transcriptional apparatus.

Hepatitis B Virus X Protein Modulates Chemokine CCL15 Upregulation in Hepatocellular Carcinoma

2021 ◽  
Vol 21 ◽  
Author(s):  
Ying Li ◽  
Chaomin Wang ◽  
Ting Zhao ◽  
Ranliang Cui ◽  
Linfei Hu ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
X Protein ◽  
Tissue Samples ◽  
B Virus ◽  
Mrna And Protein Expression ◽  
Progression Factor ◽  
Liver Tissues

Background: Hepatitis B virus X protein (HBx) is an indispensable progression factor in hepatocellular carcinoma (HCC). CCL15 could be a peculiar proteomic biomarker of HCC with tumorigenesis and tumor invasion. Objective: The aim of study was to explore the relationship between HBx and CCL15 expression in HCC. Methods: HBV–positive HCC pathological tissue samples and corresponding adjacent non-tumor liver tissues were clearly collected. The expression of HBx and CCL15 was analyzed by immunohistochemistry, real-time polymerase chain reaction (PCR) and western blot analysis in tissues or in vitro. Results: The levels of CCL15 mRNA and protein expression in HCC samples were observably higher than the ones of adjacent non-tumor liver tissues. The CCL15 was significantly associated with the expression of HBx in HBV-positive HCC samples. The up-regulation of HBx induced CCL15 expression in vitro. The high expression score of CCL15 was significant associated with the poor prognosis of HCC patients. Conclusions: The CCL15 expression was observably associated with HBx in HCC patients. The CCL15 may be considered as a indicator in clinical managment of HBV-associated HCC.

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