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Lin KM, Weng LF, Chen SYJ, Lin SJ, Tsai CH. Upregulation of IQGAP2 by EBV transactivator Rta and its influence on EBV life cycle. J Virol 2023; 97:e0054023. [PMID: 37504571 PMCID: PMC10506479 DOI: 10.1128/jvi.00540-23] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 06/09/2023] [Indexed: 07/29/2023] Open
Abstract
Epstein-Barr virus (EBV) is a human oncogenic γ-herpesvirus that establishes persistent infection in more than 90% of the world's population. EBV has two life cycles, latency and lytic replication. Reactivation of EBV from latency to the lytic cycle is initiated and controlled by two viral immediate-early transcription factors, Zta and Rta, encoded by BZLF1 and BRLF1, respectively. In this study, we found that IQGAP2 expression was elevated in EBV-infected B cells and identified Rta as a viral gene responsible for the IQGAP2 upregulation in both B cells and nasopharyngeal carcinoma cell lines. Mechanistically, we showed that Rta increases IQGAP2 expression through direct binding to the Rta-responsive element in the IQGAP2 promoter. We also demonstrated the direct interaction between Rta and IQGAP2 as well as their colocalization in the nucleus. Functionally, we showed that the induced IQGAP2 is required for the Rta-mediated Rta promoter activation in the EBV lytic cycle progression and may influence lymphoblastoid cell line clumping morphology through regulating E-cadherin expression. IMPORTANCE Elevated levels of antibodies against EBV lytic proteins and increased EBV DNA copy numbers in the sera have been reported in patients suffering from Burkitt's lymphoma, Hodgkin's lymphoma, and nasopharyngeal carcinoma, indicating that EBV lytic cycle progression may play an important role in the pathogenesis of EBV-associated diseases and highlighting the need for a more complete mechanistic understanding of the EBV lytic cycle. Rta acts as an essential transcriptional activator to induce lytic gene expression and thus trigger EBV reactivation. In this study, scaffolding protein IQGAP2 was found to be upregulated prominently following EBV infection via the direct binding of Rta to the RRE in the IQGAP2 promoter but not in response to other biological stimuli. Importantly, IQGAP2 was demonstrated to interact with Rta and promote the EBV lytic cycle progression. Suppression of IQGAP2 was also found to decrease E-cadherin expression and affect the clumping morphology of lymphoblastoid cell lines.
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Affiliation(s)
- Kai-Min Lin
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Li-Fang Weng
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Shi-Yo Jill Chen
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Sue-Jane Lin
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Ching-Hwa Tsai
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan
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Epstein-Barr Virus Viral Processivity Factor EA-D Facilitates Virus Lytic Replication by Inducing Poly(ADP-Ribose) Polymerase 1 Degradation. J Virol 2022; 96:e0037122. [PMID: 36286483 PMCID: PMC9645209 DOI: 10.1128/jvi.00371-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PARP1 acts as a negative regulator of lytic replication in EBV. To successfully enter the reactivation cycle, EBV has developed multiple strategies to counteract the host’s repressive mechanisms.
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Nečasová I, Stojaspal M, Motyčáková E, Brom T, Janovič T, Hofr C. Transcriptional regulators of human oncoviruses: structural and functional implications for anticancer therapy. NAR Cancer 2022; 4:zcac005. [PMID: 35252867 PMCID: PMC8892037 DOI: 10.1093/narcan/zcac005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 02/04/2022] [Accepted: 02/15/2022] [Indexed: 11/26/2022] Open
Abstract
Transcription is often the first biosynthetic event of viral infection. Viruses produce preferentially viral transcriptional regulators (vTRs) essential for expressing viral genes and regulating essential host cell proteins to enable viral genome replication. As vTRs are unique viral proteins that promote the transcription of viral nucleic acid, vTRs interact with host proteins to suppress detection and immune reactions to viral infection. Thus, vTRs are promising therapeutic targets that are sequentially and structurally distinct from host cell proteins. Here, we review vTRs of three human oncoviruses: HBx of hepatitis B virus, HBZ of human T-lymphotropic virus type 1, and Rta of Epstein–Barr virus. We present three cunningly exciting and dangerous transcription strategies that make viral infections so efficient. We use available structural and functional knowledge to critically examine the potential of vTRs as new antiviral-anticancer therapy targets. For each oncovirus, we describe (i) the strategy of viral genome transcription; (ii) vTRs’ structure and binding partners essential for transcription regulation; and (iii) advantages and challenges of vTR targeting in antiviral therapies. We discuss the implications of vTR regulation for oncogenesis and perspectives on developing novel antiviral and anticancer strategies.
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Affiliation(s)
- Ivona Nečasová
- Institute of Biophysics of the Czech Academy of Sciences, Scientific Incubator, Královopolská 135, Brno 612 65, Czech Republic
| | - Martin Stojaspal
- Institute of Biophysics of the Czech Academy of Sciences, Scientific Incubator, Královopolská 135, Brno 612 65, Czech Republic
| | - Edita Motyčáková
- Institute of Biophysics of the Czech Academy of Sciences, Scientific Incubator, Královopolská 135, Brno 612 65, Czech Republic
| | - Tomáš Brom
- LifeB, Functional Genomics and Proteomics, National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 753/5, Brno 625 00, Czech Republic
| | - Tomáš Janovič
- LifeB, Functional Genomics and Proteomics, National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 753/5, Brno 625 00, Czech Republic
| | - Ctirad Hofr
- Institute of Biophysics of the Czech Academy of Sciences, Scientific Incubator, Královopolská 135, Brno 612 65, Czech Republic
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Identification of anti-Epstein-Barr virus (EBV) antibody signature in EBV-associated gastric carcinoma. Gastric Cancer 2021; 24:858-867. [PMID: 33661412 PMCID: PMC8206016 DOI: 10.1007/s10120-021-01170-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 02/09/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Around 10% of gastric carcinomas (GC) contain Epstein-Barr virus (EBV) DNA. We characterized the GC-specific antibody response to this common infection, which may provide a noninvasive method to detect EBV-positive GC and elucidate its contribution to carcinogenesis. METHODS Plasma samples from EBV-positive (n = 28) and EBV-negative (n = 34) Latvian GC patients were immune-profiled against 85 EBV proteins on a multi-microbial Nucleic Acid Programmable Protein Array (EBV-NAPPA). Antibody responses were normalized for each sample as ratios to the median signal intensity (MNI) across all antigens, with seropositivity defined as MNI ≥ 2. Antibodies with ≥ 20% sensitivity at 95% specificity for tumor EBV status were verified by enzyme-linked immunosorbent assay (ELISA) and validated in independent samples from Korea and Poland (n = 24 EBV-positive, n = 65 EBV-negative). RESULTS Forty anti-EBV IgG and eight IgA antibodies were detected by EBV-NAPPA in ≥ 10% of EBV-positive or EBV-negative GC patients, of which nine IgG antibodies were discriminative for tumor EBV status. Eight of these nine were verified and seven were validated by ELISA: anti-LF2 (odds ratio = 110.0), anti-BORF2 (54.2), anti-BALF2 (44.1), anti-BaRF1 (26.7), anti-BXLF1 (12.8), anti-BRLF1 (8.3), and anti-BLLF3 (5.4). The top three had areas under receiver operating characteristics curves of 0.81-0.85 for distinguishing tumor EBV status. CONCLUSIONS The EBV-associated GC-specific humoral response was exclusively directed against lytic cycle immediate-early and early antigens, unlike other EBV-associated malignancies such as nasopharyngeal carcinoma and lymphoma where humoral response is primarily directed against late lytic antigens. Specific anti-EBV antibodies could have utility for clinical diagnosis, epidemiologic studies, and immune-based precision treatment of EBV-positive GC.
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Long X, Yang Z, Li Y, Sun Q, Li X, Kuang E. BRLF1-dependent viral and cellular transcriptomes and transcriptional regulation during EBV primary infection in B lymphoma cells. Genomics 2021; 113:2591-2604. [PMID: 34087421 DOI: 10.1016/j.ygeno.2021.05.039] [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] [Received: 09/02/2020] [Revised: 02/17/2021] [Accepted: 05/30/2021] [Indexed: 12/11/2022]
Abstract
The immediate-early protein BRLF1 plays important roles in lytic infection of Epstein-Barr virus (EBV), in which it activates lytic viral transcription and replication. However, knowledge of the influence of BRLF1 on cellular gene expression and transcriptional reprogramming during the early lytic cycle remains limited. In the present study, deep RNA-sequencing analysis identified all differentially expressed genes (DEGs) and alternative splicing in B lymphoma cells subjected to wild-type and BRLF1-deficient EBV primary infection. The BRLF1-dependent cellular DEGs were annotated, and major differentially enriched pathways were related to DNA replication and transcription, immune and inflammatory responses, cytokine-receptor interactions and chemokine signaling and metabolic processes. Furthermore, analysis of BRLF1-binding proteins by mass spectrometry shows that BRLF1 binds to and cooperates with several transcription factors and components of the spliceosome and then influences both RNA polymerase II-dependent transcription and pre-mRNA splicing. The RTA-binding RRE motifs or specific motifs of unique cooperative transcription factors in viral and cellular DEG promoter regions indicate that BRLF1 employs different strategies for regulating viral and cellular transcription. Thus, our study characterized BRLF1-dependent cellular and viral transcriptional profile during primary infection and then revealed the comprehensive virus-cell interaction and alterations of transcription during EBV primary infection and lytic replication.
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Affiliation(s)
- Xubing Long
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, Guangdong 510080, China
| | - Ziwei Yang
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, Guangdong 510080, China
| | - Yang Li
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, Guangdong 510080, China
| | - Qinqin Sun
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, Guangdong 510080, China
| | - Xiaojuan Li
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, Guangdong 510080, China.
| | - Ersheng Kuang
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, Guangdong 510080, China; Key Laboratory of Tropical Disease Control (Sun Yat-Sen University), Ministry of Education, Guangzhou, Guangdong 510080, China.
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Liang DY, Sha S, Yi Q, Shi J, Chen Y, Hou Y, Chang Q. Hepatitis B X protein upregulates decoy receptor 3 expression via the PI3K/NF-κB pathway. Cell Signal 2019; 62:109346. [PMID: 31229617 DOI: 10.1016/j.cellsig.2019.109346] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 06/14/2019] [Accepted: 06/18/2019] [Indexed: 12/22/2022]
Abstract
Chronic hepatitis B (CHB) is associated with the development of hepatocellular carcinoma (HCC). Decoy receptor 3 (DcR3) is a tumor necrosis factor receptor that promotes tumor cell survival by inhibiting apoptosis and interfering with immune surveillance. Previous studies showed that DcR3 was overexpressed in HCC cells and that short hairpin RNA (shDcR3) sensitizes TRAIL-resistant HCC cells. However, the expression of DcR3 during hepatitis B virus (HBV) infection has not been investigated. Here, we demonstrated that DcR3 was overexpressed in CHB patients and that DcR3 upregulation was positively correlated with the HBV DNA load and liver injury (determined by histological activity index, serum alanine aminotransferase level, and aspartate aminotransferase level). We found that hepatitis B virus X protein (HBx) upregulated DcR3 expression in a dose-dependent manner, but this increase was blocked by NF-κB inhibitors. HBx also induced the activation of NF-κB, and the NF-κB subunits p65 and p50 upregulated DcR3 by directly binding to the DcR3 promoters. Inhibition of PI3K significantly downregulated DcR3 and inhibited the binding of NF-κB to the DcR3 promoters. Our results demonstrate that the HBx induced DcR3 expression via the PI3K/NF-κB pathway; this process may contribute to the development of HBV-mediated HCC.
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MESH Headings
- Binding Sites/genetics
- Carcinoma, Hepatocellular/genetics
- Carcinoma, Hepatocellular/pathology
- Carcinoma, Hepatocellular/virology
- Gene Expression Regulation, Neoplastic/genetics
- Hep G2 Cells
- Hepatitis B, Chronic/genetics
- Hepatitis B, Chronic/pathology
- Hepatitis B, Chronic/virology
- Humans
- Liver Neoplasms/genetics
- Liver Neoplasms/pathology
- Liver Neoplasms/virology
- NF-kappa B p50 Subunit/genetics
- Phosphatidylinositol 3-Kinases/genetics
- Promoter Regions, Genetic/genetics
- Protein Binding/genetics
- RNA, Small Interfering/genetics
- Receptors, Tumor Necrosis Factor, Member 6b/genetics
- Signal Transduction/genetics
- Trans-Activators/genetics
- Transcription Factor RelA/genetics
- Viral Regulatory and Accessory Proteins
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Affiliation(s)
- Dong-Yu Liang
- Shanghai General Practice Medical Education and Research Center, Jiading District Central Hospital Affiliated Shanghai University of Medicine & Health Sciences, China; College of medical technology, Shanghai University of Medicine & Health Sciences, China
| | - Shuang Sha
- Shanghai Key Laboratory for Molecular Imaging, Shanghai University of Medicine & Health Sciences, Shanghai, China
| | - Qingqing Yi
- Shanghai General Practice Medical Education and Research Center, Jiading District Central Hospital Affiliated Shanghai University of Medicine & Health Sciences, China
| | - Junfeng Shi
- Shanghai Key Laboratory for Molecular Imaging, Shanghai University of Medicine & Health Sciences, Shanghai, China
| | - Yingmin Chen
- Shanghai General Practice Medical Education and Research Center, Jiading District Central Hospital Affiliated Shanghai University of Medicine & Health Sciences, China
| | - Yanqiang Hou
- Department of Central Laboratory, Shanghai Songjiang District Central Hospital, Shanghai 201600, China.
| | - Qing Chang
- Shanghai General Practice Medical Education and Research Center, Jiading District Central Hospital Affiliated Shanghai University of Medicine & Health Sciences, China.
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Hou Y, Liang D, Liu Y, Chen H, Lou X. Up-regulation of DcR3 in microbial toxins-stimulated HUVECs involves NF-κB signalling. BMC BIOCHEMISTRY 2018; 19:13. [PMID: 30587127 PMCID: PMC6307204 DOI: 10.1186/s12858-018-0102-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 12/05/2018] [Indexed: 12/11/2022]
Abstract
Background Sepsis is a severe condition characterised by the body’s systemic inflammatory response to infection. The specific sepsis-related biomarkers should be used in clinical diagnosis, therapeutic response monitoring, rational use of antibiotics, and prognosis (risk stratification), etc. Results In this study, we investigated the expression level of Decoy Receptor 3 (DcR3) and the mechanism of high expression in sepsis patients. Septic cell model experiments were performed by treating human umbilical vein endothelial cells (HUVECs) and Jurkat cells with lipopolysaccharide (LPS), lipoteichoic acid (LTA) and zymosan, respectively. SP600125, SB203580 and ammonium pyrrolidinedithiocarbamate (PDTC) were used to inhibit JNK1/2, p38MAPK and NF-κB signalling pathways in septic cell model, respectively. These results showed that DcR3 levels were higher in sepsis group than control. DcR3 mRNA and protein levels in HUVECs were increased following treatment with LPS, LTA and zymosan, and also increased in Jurkat cells treated by LPS, but not by LTA or zymosan. When HUVECs were treated with the NF-κB inhibitor PDTC, DcR3 expression was decreased compared with controls. However, SP600125 and SB203580 had no effect on DcR3 mRNA or protein levels. Conclusions The results indicated that DcR3 secretion proceeded through the NF-κB signalling pathway in HUVECs.
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Affiliation(s)
- Yanqiang Hou
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, NO.748 Middle Zhongshan Road, Songjiang District, Shanghai, 201600, China.
| | - Dongyu Liang
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, NO.748 Middle Zhongshan Road, Songjiang District, Shanghai, 201600, China
| | - Yang Liu
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, NO.748 Middle Zhongshan Road, Songjiang District, Shanghai, 201600, China
| | - Hongwei Chen
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, NO.748 Middle Zhongshan Road, Songjiang District, Shanghai, 201600, China
| | - Xiaoli Lou
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, NO.748 Middle Zhongshan Road, Songjiang District, Shanghai, 201600, China
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Lan YY, Chang FH, Tsai JH, Chang Y. Epstein-Barr virus Rta promotes invasion of bystander tumor cells through paracrine of matrix metalloproteinase 9. Biochem Biophys Res Commun 2018; 503:2160-2166. [PMID: 30082032 DOI: 10.1016/j.bbrc.2018.08.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Accepted: 08/01/2018] [Indexed: 10/28/2022]
Abstract
Clinical studies suggest a positive association between malignant progression of nasopharyngeal carcinoma (NPC) and Rta, a transcription factor of Epstein-Barr virus (EBV). However, Rta induces cellular senescence in vitro. To provide an underlying mechanism integrating these clues, we adapted a concept of senescence-associated secretory phenotype (SASP), based on which senescent cells facilitate tumor progression through paracrine. First, Rta-expressing NPC cells themselves show reduced invasiveness but promote invasion of Rta-negative tumor cells through secreted factors. Secretion of matrix metalloproteinase 9 (MMP9), an SASP protein, is increased by Rta, which requires the C-terminus of Rta and Rta-induced activation of E2F. Furthermore, the Rta-induced, paracrine-mediated pro-invasive effect is blocked upon knockdown of MMP9 expression or treatment with an MMP9 inhibitor. This study not only indicates that Rta can contribute to NPC progression through paracrine but also supports that MMP9 is a potential therapeutic target to prevent NPC metastasis.
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Affiliation(s)
- Yu-Yan Lan
- Department of Physical Therapy, Shu-Zen Junior College of Medicine and Management, Kaohsiung, 821, Taiwan; National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Tainan, 704, Taiwan
| | - Fang-Hsin Chang
- Department of Microbiology and Immunology, Medical College, National Cheng Kung University, Tainan, 701, Taiwan; National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Tainan, 704, Taiwan
| | - Jen-Hao Tsai
- National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Tainan, 704, Taiwan
| | - Yao Chang
- Department of Microbiology and Immunology, Medical College, National Cheng Kung University, Tainan, 701, Taiwan; National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Tainan, 704, Taiwan.
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Lou X, Hou Y, Cao H, Zhao J, Zhu F. Clinical significance of decoy receptor 3 upregulation in patients with hepatitis B and liver fibrosis. Oncol Lett 2018; 16:1147-1154. [PMID: 30061940 DOI: 10.3892/ol.2018.8762] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 04/16/2018] [Indexed: 12/28/2022] Open
Abstract
Decoy receptor 3 (DcR3) is a tumor necrosis factor receptor, which may inhibit apoptosis. The aim of the present study was to investigate the clinical significance of DcR3 upregulation in patients with chronic hepatitis B (CHB) and hepatic fibrosis. A total of 128 patients with a clinical diagnosis of CHB who underwent liver biopsy were included in the present study. The expression levels of DcR3, hyaluronic acid (HA), type III procollagen, type IV collagen (IV-C) and laminin protein were assessed. The diagnostic value of DcR3 in patients with CHB with hepatic fibrosis was determined using receiver operating characteristic (ROC) curve analysis. DcR3 was significantly upregulated in patients with CHB, particularly in patients with active CHB. The expression of DcR3 was significantly increased in patients with CHB with liver fibrosis and liver cirrhosis, compared with patients with CHB without liver fibrosis. The area under the ROC curve for the diagnosis of CHB liver fibrosis based on DcR3 or DcR3 combined with IV-C/HA was 0.807 or 0.869, with a sensitivity and specificity of 76.9 and 77.8% or 84.6 and 81.2%, respectively. DcR3 is a marker for liver fibrosis in patients with hepatitis B infection. The use of DcR3 in combination with IV-C and HA may further increase its diagnostic value for liver fibrosis.
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Affiliation(s)
- Xiaoli Lou
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, Shanghai 201600, P.R. China
| | - Yanqiang Hou
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, Shanghai 201600, P.R. China
| | - Hui Cao
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, Shanghai 201600, P.R. China
| | - Jingjing Zhao
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, Shanghai 201600, P.R. China
| | - Fengting Zhu
- Department of Central Laboratory, Songjiang Hospital Affiliated First People's Hospital, Shanghai Jiao Tong University, Shanghai 201600, P.R. China
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Ge H, Liang C, Li Z, An D, Ren S, Yue C, Wu J. DcR3 induces proliferation, migration, invasion, and EMT in gastric cancer cells via the PI3K/AKT/GSK-3β/β-catenin signaling pathway. Onco Targets Ther 2018; 11:4177-4187. [PMID: 30050309 PMCID: PMC6056154 DOI: 10.2147/ott.s172713] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Background Decoy receptor 3 (DcR3) has been reported to be overexpressed in a wide variety of malignancies and is correlated with tumorigenesis and progression. In gastric cancer (GC), DcR3 overexpression is associated with lymph node and distant metastasis, as well as poor prognosis. However, the functional role of DcR3 expression in GC remains elusive. Purpose The aim of this study is to elucidate the direct role of DcR3 in regulating GC progression and metastasis and identify the potential mechanism. Methods DcR3 expression was stably knocked down in HGC27 and MKN28 cells by transfecting the cells with DcR3 shRNA using lentiviral vector system. After the knockdown of DcR3 was confirmed, cell proliferation, colony formation, cell cycle distribution, apoptosis, cell invasion and migration were assessed in vitro. In addition, Western blot analysis was performed to evaluate the expression of downstream mediators of DcR3. Comparisons between multiple groups were performed using one-way analysis of variance (ANOVA) or unpaired Student’s t-test. Differences were considered significant at P<0.05. Results Our findings demonstrate that DcR3 induces proliferation, migration, invasion, and promotes epithelial-mesenchymal transition (EMT) of GC cells. In addition, DcR3 increases the expression levels of several components of the PI3K/AKT/GSK-3β/β-catenin signaling pathway, such as p-AKT, GSK-3β, p-GSK-3β and β-catenin. Additionally, DcR3 also enhances the expression of N-cadherin and Vimentin and decreases the expression of E-cadherin. Conclusion In summary, the findings of this study indicate that during GC progression, DcR3 plays a key role in cell proliferation and invasion via the PI3K/AKT/GSK-3β/β-catenin signaling pathway. Thus, targeting DcR3 might be a potential therapeutic approach for the treatment of GC.
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Affiliation(s)
- Hua Ge
- Department of General Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China,
| | - Chaojie Liang
- Department of General Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China,
| | - Zhixia Li
- Department of General Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China,
| | - Dali An
- Department of General Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China,
| | - Shulin Ren
- Department of General Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China,
| | - Chaosen Yue
- Department of General Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China,
| | - Jixiang Wu
- Department of General Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China,
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Abstract
Decoy receptor 3 (DcR3), also known as tumor necrosis factor receptor (TNFR) superfamily member 6b (TNFRSF6B), is a soluble decoy receptor which can neutralize the biological functions of three members of tumor necrosis factor superfamily (TNFSF): Fas ligand (FasL), LIGHT, and TL1A. In addition to ‘decoy’ function, recombinant DcR3.Fc is able to modulate the activation and differentiation of dendritic cells (DCs) and macrophages via ‘non-decoy’ action. DcR3-treated DCs skew T cell differentiation into Th2 phenotype, while DcR3-treated macrophages behave M2 phenotype. DcR3 is upregulated in various cancer cells and several inflammatory tissues, and is regarded as a potential biomarker to predict inflammatory disease progression and cancer metastasis. However, whether DcR3 is a pathogenic factor or a suppressor to attenuate inflammatory reactions, has not been discussed comprehensively yet. Because mouse genome does not have DcR3, it is not feasible to investigate its physiological functions by gene-knockout approach. However, DcR3-mediated effects in vitro are determined via overexpressing DcR3 or addition of recombinant DcR3.Fc fusion protein. Moreover, CD68-driven DcR3 transgenic mice are used to investigate DcR3-mediated systemic effects in vivo. Upregulation of DcR3 during inflammatory reactions exerts negative-feedback to suppress inflammation, while tumor cells hijack DcR3 to prevent apoptosis and promote tumor growth and invasion. Thus, ‘switch-on’ of DcR3 expression may be feasible for the treatment of inflammatory diseases and enhance tissue repairing, while ‘switch-off’ of DcR3 expression can enhance tumor apoptosis and suppress tumor growth in vivo.
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Affiliation(s)
- Shie-Liang Hsieh
- Genomics Research Center, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei, 115, Taiwan. .,Institute of Clinical Medicine & Immunology Research Center, National Yang-Ming University, Taipei, Taiwan. .,Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan. .,Institute of Immunology, College of Medicine, National Taiwan University Taipei, Taipei, Taiwan. .,Institute for Cancer Biology and Drug Discovery, Taipei Medical University, Taipei, Taiwan.
| | - Wan-Wan Lin
- Department of Pharmacology, College of Medicine, National Taiwan University, No. 1 Section 1, Jen Ai Road, Taipei, 10001, Taiwan.
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Hung CH, Chen LW, Wang WH, Chang PJ, Chiu YF, Hung CC, Lin YJ, Liou JY, Tsai WJ, Hung CL, Liu ST. Regulation of autophagic activation by Rta of Epstein-Barr virus via the extracellular signal-regulated kinase pathway. J Virol 2014; 88:12133-45. [PMID: 25122800 PMCID: PMC4178756 DOI: 10.1128/jvi.02033-14] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 08/04/2014] [Indexed: 12/14/2022] Open
Abstract
Autophagy is an intracellular degradation pathway that provides a host defense mechanism against intracellular pathogens. However, many viruses exploit this mechanism to promote their replication. This study shows that lytic induction of Epstein-Barr virus (EBV) increases the membrane-bound form of LC3 (LC3-II) and LC3-containing punctate structures in EBV-positive cells. Transfecting 293T cells with a plasmid that expresses Rta also induces autophagy, revealing that Rta is responsible for autophagic activation. The activation involves Atg5, a key component of autophagy, but not the mTOR pathway. The expression of Rta also activates the transcription of the genes that participate in the formation of autophagosomes, including LC3A, LC3B, and ATG9B genes, as well as those that are involved in the regulation of autophagy, including the genes TNF, IRGM, and TRAIL. Additionally, treatment with U0126 inhibits the Rta-induced autophagy and the expression of autophagy genes, indicating that the autophagic activation is caused by the activation of extracellular signal-regulated kinase (ERK) signaling by Rta. Finally, the inhibition of autophagic activity by an autophagy inhibitor, 3-methyladenine, or Atg5 small interfering RNA, reduces the expression of EBV lytic proteins and the production of viral particles, revealing that autophagy is critical to EBV lytic progression. This investigation reveals how an EBV-encoded transcription factor promotes autophagy to affect viral lytic development.
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Affiliation(s)
- Chien-Hui Hung
- Graduate Institute of Clinical Medical Sciences, Chang-Gung University, Taoyuan, Taiwan
| | - Lee-Wen Chen
- Department of Respiratory Care, Chung-Gung University of Science and Technology, Chiayi, Taiwan
| | - Wen-Hung Wang
- Molecular Genetics Laboratory, Department of Microbiology and Immunology, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
| | - Pey-Jium Chang
- Graduate Institute of Clinical Medical Sciences, Chang-Gung University, Taoyuan, Taiwan
| | - Ya-Fang Chiu
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Chen-Chia Hung
- Molecular Genetics Laboratory, Department of Microbiology and Immunology, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
| | - Ying-Ju Lin
- Graduate Institute of Chinese Medical Science, China Medical University, Taichung, Taiwan
| | - Jieh-Yuan Liou
- Department of Medical Research, Chang-Gung Memorial Hospital, Chiayi, Taiwan
| | - Wan-Ju Tsai
- Graduate Institute of Clinical Medical Sciences, Chang-Gung University, Taoyuan, Taiwan
| | - Chia-Ling Hung
- Graduate Institute of Clinical Medical Sciences, Chang-Gung University, Taoyuan, Taiwan
| | - Shih-Tung Liu
- Molecular Genetics Laboratory, Department of Microbiology and Immunology, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
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Zhu LH, Gao S, Jin R, Zhuang LL, Jiang L, Qiu LZ, Xu HG, Zhou GP. Repression of interferon regulatory factor 3 by the Epstein-Barr virus immediate-early protein Rta is mediated through E2F1 in HeLa cells. Mol Med Rep 2014; 9:1453-9. [PMID: 24535579 DOI: 10.3892/mmr.2014.1957] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2013] [Accepted: 02/10/2014] [Indexed: 11/06/2022] Open
Abstract
Interferon regulatory factor 3 (IRF-3), an essential transcriptional regulator of the interferon (IFN) genes, is important in the host defense against viral and microbial infection. Epstein-Barr virus (EBV) immediate-early protein replication and transcription activator (Rta) and the transcription factor E2F1 are two important inhibitive factors, which repress IRF-3 expression. Numerous studies have identified that Rta can directly bind to the Rta-response element in promoters of its target genes and regulate their expression. In the present study, we demonstrated that Rta represses the expression of IRF-3 by E2F1 rather than through its traditional way. Transient transfection analysis and chromatin immunoprecipitation (ChIP) assays revealed that the overexpression of Rta elevated the expression of E2F1 and increased the binding of E2F1 to the promoter of IRF-3. The mutation of the E2F1‑binding site and the knocking down of E2F1 by small interfering RNA (siRNA) can eradicate the inhibitory effect of Rta. These results suggested that Rta represses IRF-3 expression by increasing E2F1 binding to the IRF-3 promoter.
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Affiliation(s)
- Liang-Hua Zhu
- Department of Pediatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Shan Gao
- Department of Pediatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Rui Jin
- Department of Pediatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Li-Li Zhuang
- Department of Pediatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Li Jiang
- Department of Pediatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Ling-Zhi Qiu
- Department of Pediatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Hua-Guo Xu
- Department of Clinical Laboratory, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Guo-Ping Zhou
- Department of Pediatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
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14
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Weissinger D, Tagscherer KE, Macher-Göppinger S, Haferkamp A, Wagener N, Roth W. The soluble Decoy Receptor 3 is regulated by a PI3K-dependent mechanism and promotes migration and invasion in renal cell carcinoma. Mol Cancer 2013; 12:120. [PMID: 24107265 PMCID: PMC3852559 DOI: 10.1186/1476-4598-12-120] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 10/04/2013] [Indexed: 01/04/2023] Open
Abstract
Background Overexpression of Decoy Receptor 3 (DcR3), a soluble member of the tumor necrosis factor receptor superfamily, is a common event in several types of cancer. In renal cell carcinoma (RCC), DcR3 overexpression is associated with lymph node and distant metastasis as well as a poor prognosis. However, the functional role and regulation of DcR3 expression in RCC is so far unknown. Methods Modulation of DcR3 expression by siRNA and ectopic gene expression, respectively, was performed in ACHN and 769-P RCC cell lines. Functional effects of a modulated DcR3 expression were analyzed with regard to migration, invasion, adhesion, clonogenicity, and proliferation. Furthermore, quantitative RT-PCR and immunoblot analyses were performed to evaluate the expression of downstream mediators of DcR3. In further experiments, luciferase assays, quantitative RT-PCR and immunoblot analyses were applied to study the regulation of DcR3 expression in RCC. Additionally, an ex vivo tissue slice culture technique combined with immunohistochemistry was used to study the regulation of DcR3 expression in human RCC specimens. Results Here, we show that DcR3 promotes adhesion, migration and invasiveness of RCC cells. The DcR3-dependent increase in cellular invasiveness is accompanied with an up-regulation of integrin alpha 4, matrixmetalloproteinase 7 and urokinase plasminogen activator (uPA). Further, we identified a signaling pathway regulating DcR3 expression in RCC. Using in vitro experiments as well as an ex vivo RCC tissue slice culture model, we demonstrate that expression of DcR3 is regulated in a PI3K/AKT-dependent manner involving the transcription factor nuclear factor of activated T-cells (NFAT). Conclusions Taken together, our results identify DcR3 as a key driver of tumor cell dissemination and suggest DcR3 as a promising target for rational therapy of RCC.
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Affiliation(s)
- Daniel Weissinger
- Molecular Tumor-Pathology, German Cancer Research Center (DKFZ), Heidelberg 69120, Germany.
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15
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Lin YT, Yen CH, Chen HL, Liao YJ, Lin IF, Chen M, Lan YC, Chuang SY, Hsieh SL, Chen YMA. The serologic decoy receptor 3 (DcR3) levels are associated with slower disease progression in HIV-1/AIDS patients. J Formos Med Assoc 2013; 114:498-503. [PMID: 26062966 DOI: 10.1016/j.jfma.2013.01.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 01/15/2013] [Accepted: 01/22/2013] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND/PURPOSE The decoy receptor 3 (DcR3) is a member of the tumor necrosis factor receptor (TNFR) super-family. It counteracts the biological effects of Fas ligands and inhibits apoptosis. The goals of this study were to understand the associations between serologic DcR3 (sDcR3) levels and different human immunodeficiency virus type 1 (HIV-1) subtypes, as well as the AIDS disease progression. METHODS Serum samples from 61 HIV/AIDS patients, who had been followed up every 6 months for 3 years, were collected. sDcR3 levels were quantified using an enzyme immunoassay (EIA). RESULTS The sDcR3 levels in patients with HIV-1 subtype B were significantly higher than those in patients infected with subtype CRF01_AE (p < 0.001). In addition, multivariable linear mixed model analysis demonstrated that HIV-1 subtype B and slow disease progression were associated with higher levels of sDcR3, adjusting for potential predictors (p = 0.0008 and 0.0455, respectively). CONCLUSION HIV-1-infected cells may gain a survival advantage by activating DcR3, which prevents infected cell detection by the host immune system. These data indicate that the sDcR3 level is a biomarker for AIDS disease progression.
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Affiliation(s)
- Yu-Ting Lin
- AIDS Prevention and Research Centre, National Yang-Ming University, Taipei 11221, Taiwan
| | - Chia-Hung Yen
- AIDS Prevention and Research Centre, National Yang-Ming University, Taipei 11221, Taiwan
| | - Heng-Li Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Yi-Jen Liao
- AIDS Prevention and Research Centre, National Yang-Ming University, Taipei 11221, Taiwan; School of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei 11031, Taiwan
| | - I-Feng Lin
- Institute of Public Health, National Yang-Ming University, Taipei 11221, Taiwan
| | - Marcelo Chen
- AIDS Prevention and Research Centre, National Yang-Ming University, Taipei 11221, Taiwan; Department of Urology, Mackay Memorial Hospital, Taipei 10449, Taiwan; School of Medicine, Mackay Medical College, New Taipei City 25245, Taiwan
| | - Yu-Ching Lan
- AIDS Prevention and Research Centre, National Yang-Ming University, Taipei 11221, Taiwan; Department of Health Risk Management, China Medical University, Taichung 40402, Taiwan
| | - Shao-Yuan Chuang
- Institute of Population Health Sciences, National Health Research Institutes, Miaoli County 35053, Taiwan
| | - Shie-Liang Hsieh
- Institute of Clinical Medicine, National Yang-Ming University, Taipei 11221, Taiwan; Department and Institute of Microbiology and Immunology, National Yang-Ming University, Taipei 11221, Taiwan; Infection and Immunity Research Centre, National Yang-Ming University, Taipei 11221, Taiwan; Immunology Centre, Taipei Veterans General Hospital, Taipei 11221, Taiwan
| | - Yi-Ming Arthur Chen
- AIDS Prevention and Research Centre, National Yang-Ming University, Taipei 11221, Taiwan; Department of Microbiology, School of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan.
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16
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Kim JH, Kim WS, Park C. Epstein-Barr virus latent membrane protein 1 increases genomic instability through Egr-1-mediated up-regulation of activation-induced cytidine deaminase in B-cell lymphoma. Leuk Lymphoma 2013; 54:2035-40. [PMID: 23363221 DOI: 10.3109/10428194.2013.769218] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Epstein-Barr virus (EBV)-encoded latent membrane protein-1 (LMP1) is a transmembrane protein essential for EBV-induced immortalization and transformation of B cells. Activation-induced cytidine deaminase (AID) triggers somatic hypermutation and recombination, in turn contributing to lymphomagenesis. Here, we report an intracellular mechanism by which LMP1 contributes to B cell lymphomagenesis via AID expression. In our experiments, LMP1 increased AID mRNA expression and promoter activity. The AID promoter region contains a binding site for Egr-1, a prominent transcription factor that is reported to be up-regulated by LMP1. In promoter activity analysis, Egr-1 enhanced the reporter activity of the wild-type AID promoter, but not that containing a mutated Egr-1 binding site. Egr-1 knockdown abrogated LMP-1-mediated up-regulation of AID promoter reporter activity in EBV-negative BJAB cells and reduced AID promoter reporter activity in EBV-positive SKW6.4 cells. AID induced down-regulation of the nuclear factor-κB (NFκB) inhibitory tumor suppressor Rassf6, suggesting that AID functions as an upstream regulator of the NFκB inhibitory Rassf6. Moreover, Egr-1 expression was associated with an increased number of genomic lesions in genome-wide analysis using single nucleotide polymorphism (SNP) microarray and copy number variation (CNV). Collectively, LMP1 induces AID up-regulation and genomic instability via Egr-1. Increased AID expression may, in turn, promote down-regulation of the NFκB inhibitor, Rassf6, thereby further increasing the survival of genetically destabilized B-cell lymphoma cells.
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Affiliation(s)
- Joo Hyun Kim
- Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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17
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Yoo S, Jang J, Kim S, Cho H, Lee MS. Expression of DcR3 and Its Effects in Kaposi’s Sarcoma-Associated Herpesvirus-Infected Human Endothelial Cells. Intervirology 2012; 55:45-52. [DOI: 10.1159/000323522] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Accepted: 11/18/2010] [Indexed: 11/19/2022] Open
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18
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Lin WW, Hsieh SL. Decoy receptor 3: a pleiotropic immunomodulator and biomarker for inflammatory diseases, autoimmune diseases and cancer. Biochem Pharmacol 2011; 81:838-47. [PMID: 21295012 DOI: 10.1016/j.bcp.2011.01.011] [Citation(s) in RCA: 120] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Revised: 01/19/2011] [Accepted: 01/24/2011] [Indexed: 12/28/2022]
Abstract
Recently, several decoy molecules belonging to tumor necrosis factor receptor superfamily (TNFRSF) have been identified, including decoy receptor 1 (DcR1), decoy receptor 2 (DcR2), and decoy receptor 3 (DcR3). One of the tumor necrosis factor superfamily (TNFSF) members, TNF-related apoptosis-inducing ligand (TRAIL), binds to DcR1 and DcR2, which are membranous receptors with a truncated cytoplasmic domain, thus unable to transduce TRAIL-mediated signaling. In contrast to DcR1 and DcR2, DcR3 is a soluble receptor capable of neutralizing the biological effects of three other TNFSF members: Fas ligand (FasL/TNFSF6/CD95L), LIGHT (TNFSF14) and TNF-like molecule 1A (TL1A/TNFSF15). Since FasL is a potent apoptosis- and inflammation-inducing factor, LIGHT is involved in apoptosis and inflammation, and TL1A is a T cell costimulator and is involved in gut inflammation, DcR3 can be defined as an immunomodulator on the basis of its neutralizing effects on FasL, LIGHT, and TL1A. Initial studies demonstrated that DcR3 expression is elevated in tumors cells; however, later work showed that DcR3 expression is also upregulated in inflammatory diseases, where serum DcR3 levels correlate with disease progression. In addition to its neutralizing effect, DcR3 also acts as an effector molecule to modulate cell function via 'non-decoy' activities. This review focuses on the immunomodulatory effects of DcR3 via 'decoy' and 'non-decoy' functions, and discusses the potential of DcR3 as a biomarker to predict cancer invasion and inflammation progression. We also discuss the possible utility of recombinant DcR3 as a therapeutic agent to control autoimmune diseases, as well as the potential to attenuate tumor progression by inhibiting DcR3 expression.
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Affiliation(s)
- Wan-Wan Lin
- Department of Pharmacology, National Taiwan University, Taipei, Taiwan
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Clyde K, Glaunsinger BA. Getting the message direct manipulation of host mRNA accumulation during gammaherpesvirus lytic infection. Adv Virus Res 2011; 78:1-42. [PMID: 21040830 DOI: 10.1016/b978-0-12-385032-4.00001-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The Gammaherpesvirinae subfamily of herpesviruses comprises lymphotropic viruses, including the oncogenic human pathogens Epstein-Barr virus and Kaposi's sarcoma-associated herpesvirus. During lytic infection, gammaherpesviruses manipulate host gene expression to optimize the cellular environment for viral replication and to evade the immune response. Additionally, although a lytically infected cell will itself be killed in the process of viral replication, lytic infection can contribute to pathogenesis by inducing the secretion of paracrine factors with functions in cell survival and proliferation, and angiogenesis. The mechanisms by which these viruses manipulate host gene expression are varied and target the accumulation of cellular mRNAs and their translation, signaling pathways, and protein stability. Here, we discuss how gammaherpesviral proteins directly influence host mRNA biogenesis and stability, either selectively or globally, in order to fine-tune the cellular environment to the advantage of the virus. Appreciation of the mechanisms by which these viruses interface with and adapt normal cellular processes continues to inform our understanding of gammaherpesviral biology and the regulation of mRNA accumulation and turnover in our own cells.
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Affiliation(s)
- Karen Clyde
- Department of Plant and Microbial Biology, University of California, Berkeley, USA
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20
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Ho CH, Chen CL, Li WY, Chen CJ. Decoy receptor 3, upregulated by Epstein-Barr virus latent membrane protein 1, enhances nasopharyngeal carcinoma cell migration and invasion. Carcinogenesis 2009; 30:1443-51. [PMID: 19483191 DOI: 10.1093/carcin/bgp135] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Decoy receptor 3 (DcR3), a member of tumor necrosis factor receptor superfamily, has been implicated in tumorigenesis through its abilities to modulate immune responses and induce angiogenesis. Epstein-Barr virus (EBV), a ubiquitous gamma-herpesvirus, is associated with malignancies including nasopharyngeal carcinoma (NPC). Previous studies show that DcR3 is overexpressed in EBV-positive lymphomas and Rta, an EBV transcription activator, can upregulate DcR3 in Burkitt lymphoma cell lines. However, DcR3 expression has not been demonstrated in EBV-associated NPC nor have there been any EBV latent genes linked to DcR3 upregulation. Here, we showed DcR3 was overexpressed in NPC. Higher DcR3 expression score and DcR3-positive rate were found in metastatic NPC than in primary NPC tissues, suggesting DcR3 may enhance cell metastatic potential. This hypothesis is supported by our observation that NPC HONE-1 cells overexpressing DcR3 exhibited significant higher migration and invasion abilities in vitro. We found besides Rta, EBV latent membrane protein (LMP) 1 can upregulate DcR3 via nuclear factor-kappaB and phosphatidylinositol 3-kinase-signaling events. Approximate 75% of LMP1-positive NPC tissues overexpressed DcR3, suggesting LMP1 may enhance DcR3 expression in vivo. Data herein suggested that increasing DcR3 expression by LMP1 not only helps EBV-associated cancer cells gain survival advantage by preventing host immune detection but also increases the chance of cancer metastasis by enhancing cell migration and invasion. All these DcR3-mediated events facilitate normal cells to gain cancer hallmarks.
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Affiliation(s)
- Cheng-Hsun Ho
- Institute of Microbiology and Immunology, National Yang-Ming University, No. 155, Section 2, Linong Street, Taipei 112, Taiwan
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21
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CUX1/Wnt signaling regulates epithelial mesenchymal transition in EBV infected epithelial cells. Exp Cell Res 2009; 315:1819-31. [PMID: 19361498 DOI: 10.1016/j.yexcr.2009.04.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2008] [Revised: 03/06/2009] [Accepted: 04/02/2009] [Indexed: 02/07/2023]
Abstract
Idiopathic pulmonary fibrosis (IPF) is a refractory and lethal interstitial lung disease characterized by alveolar epithelial cells apoptosis, fibroblast proliferation and extra-cellular matrix protein deposition. EBV, localised to alveolar epithelial cells of pulmonary fibrosis patients is associated with a poor prognosis. A strategy based on microarray-differential gene expression analysis to identify molecular drivers of EBV-associated lung fibrosis was utilized. Alveolar epithelial cells were infected with EBV to identify genes whose expression was altered following TGFbeta1-mediated lytic phase. EBV lytic reactivation by TGFbeta1 drives a selective alteration in CUX1 variant (a) (NCBI accession number NM_181552) expression, inducing activation of non-canonical Wnt pathway mediators, implicating it in Epithelial Mesenchymal Transition (EMT), the molecular event underpinning scar production in tissue fibrosis. The role of EBV in EMT can be attenuated by antiviral strategies and inhibition of Wnt signaling by using All-Trans Retinoic Acids (ATRA). Activation of non-canonical Wnt signaling pathway by EBV in epithelial cells suggests a novel mechanism of EMT via CUX1 signaling. These data present a framework for further description of the link between infectious agents and fibrosis, a significant disease burden.
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Abstract
Soluble cytokine receptors play key roles in regulating cytokine-mediated biological events by binding and modulating the activity of target ligands in either an antagonistic or agonistic fashion. This Minireview will provide an overview of the molecular mechanisms mediating the generation of soluble cytokine receptors, which include sheddase-mediated proteolytic cleavage of cell-surface receptors, generation of soluble receptors by alternative gene splicing, transcription and translation of cytokine-binding genes, and extracellular release of membrane-bound receptors within vesicles such as exosomes.
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Affiliation(s)
- Stewart J Levine
- Pulmonary and Vascular Medicine Branch, NHLBI, NIH, Bethesda, MD 20892-1590, USA.
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Epstein-Barr virus lytic transactivator Zta enhances chemotactic activity through induction of interleukin-8 in nasopharyngeal carcinoma cells. J Virol 2008; 82:3679-88. [PMID: 18234802 DOI: 10.1128/jvi.02301-07] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Epstein-Barr virus (EBV)-associated, undifferentiated type of nasopharyngeal carcinoma (NPC) is characterized by intensive leukocyte infiltration. Interaction between the infiltrating cells and the tumor cells has been considered crucial for NPC development. Recruitment of the infiltrates can be directed by certain chemokines present in the NPC tissues. It is unknown whether and how EBV lytic infection regulates expression of the chemokines. Using an antibody array, we first found that several chemokines secreted from EBV-infected NPC cells are increased upon EBV reactivation into the lytic cycle, and interleukin-8 (IL-8) is the chemokine upregulated most significantly and consistently. Further studies showed that the EBV lytic transactivator Zta is a potent inducer of IL-8 in NPC cells, augmenting secreted and intracellular IL-8 proteins, as well as IL-8 RNA. Zta upregulates Egr-1, a cellular transcription factor that has been involved in upregulation of IL-8, but the Zta-induced IL-8 expression is independent of Egr-1. The ability of Zta to transactivate the IL-8 promoter is important for the induction of IL-8, and we have identified two Zta-responsive elements in the promoter. Zta can bind to these two elements in vitro and can also be recruited to the IL-8 promoter in vivo. DNA-binding-defective Zta mutants can neither activate the IL-8 promoter nor induce IL-8 production. In addition, Zta-expressing NPC cells exert enhanced chemotactic activity that is mainly mediated by IL-8. Since IL-8 may contribute to not only leukocyte infiltration but also multiple oncogenic processes, the present study provides a potential link between EBV lytic infection and pathogenesis of NPC.
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