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Gao X, Li J, Wang Y, Liu S, Yue B. Clinical characteristics and prognostic significance of EBER positivity in diffuse large B-cell lymphoma: A meta-analysis. PLoS One 2018; 13:e0199398. [PMID: 29920566 PMCID: PMC6007832 DOI: 10.1371/journal.pone.0199398] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 06/06/2018] [Indexed: 12/15/2022] Open
Abstract
Recent studies show that Epstein-Barr virus (EBV) positivity might be related to adverse prognosis in patients with diffuse large B-cell lymphoma (DLBCL), but the results are still inconclusive. We conducted this meta-analysis to define the clinical value of EBV infection in DLBCL. All potential articles in PubMed, Web of Science, Medline, and Embase were retrieved. Using the random-effects or fixed-effect model, pooled hazard ratios (HRs) or relative risk (RR) with 95% confidence intervals (CIs) were used to calculate the correlation between EBER and prognosis and clinical features in DLBCL. A total of 13 qualified studies with 4111 patients were identified in our meta-analysis based on the inclusion and exclusion criteria. The overall estimates revealed that EBV-encoded small RNAs (EBER) positivity was significantly correlated with worse overall survival (HR = 2.43, 95% CI: 1.73–3.36) and progression-free survival (HR = 3.60, 95% CI: 2.07–6.26). In addition, EBER positivity was associated with age older than 60 years (RR = 1.51, 95% CI: 1.02–2.24), male sex (RR = 1.34, 95% CI: 1.05–1.71), more advanced stage (RR = 2.25, 95% CI: 1.72–2.96), high international prognostic index (RR = 2.20, 95% CI: 1.71–2.82), more than one extranodal involvement (RR = 1.69, 95% CI: 1.27–2.26), presence of B symptom (RR = 1.75, 95% CI: 1.30–2.35), non-germinal center B-cell subtype (RR = 1.35, 95% CI: 1.03–1.78), and elevated lactate dehydrogenase levels (RR = 1.30, 95% CI: 0.98–1.72). EBER positivity was correlated with worse outcomes, worse clinical course, and adverse clinicopathologic features among patients with DLBCL.
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MESH Headings
- Disease-Free Survival
- Herpesvirus 4, Human/genetics
- Herpesvirus 4, Human/isolation & purification
- Herpesvirus 4, Human/pathogenicity
- Humans
- Lymphoma, Large B-Cell, Diffuse/epidemiology
- Lymphoma, Large B-Cell, Diffuse/pathology
- Lymphoma, Large B-Cell, Diffuse/virology
- Prognosis
- RNA, Viral/genetics
- RNA, Viral/isolation & purification
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Affiliation(s)
- Xiaojuan Gao
- Department of Laboratory Medicine, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, P. R. China
- Faculty of Laboratory Medicine, Zhengzhou University, Zhengzhou, P. R. China
| | - Jia Li
- Department of Laboratory Medicine, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, P. R. China
- Faculty of Laboratory Medicine, Zhengzhou University, Zhengzhou, P. R. China
| | - Yaqi Wang
- Department of Laboratory Medicine, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, P. R. China
- Faculty of Laboratory Medicine, Zhengzhou University, Zhengzhou, P. R. China
| | - Shuai Liu
- Department of Laboratory Medicine, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, P. R. China
- Faculty of Laboratory Medicine, Zhengzhou University, Zhengzhou, P. R. China
- Key Laboratory Medicine of Henan Province, Faculty of Laboratory Medicine of Zhengzhou University, Zhengzhou, P. R. China
| | - Baohong Yue
- Department of Laboratory Medicine, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, P. R. China
- Faculty of Laboratory Medicine, Zhengzhou University, Zhengzhou, P. R. China
- Key Laboratory Medicine of Henan Province, Faculty of Laboratory Medicine of Zhengzhou University, Zhengzhou, P. R. China
- Open Laboratory, Henan Province Key Subject of Clinical Medicine, Zhengzhou, P. R. China
- * E-mail:
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EBNA1: Oncogenic Activity, Immune Evasion and Biochemical Functions Provide Targets for Novel Therapeutic Strategies against Epstein-Barr Virus- Associated Cancers. Cancers (Basel) 2018; 10:cancers10040109. [PMID: 29642420 PMCID: PMC5923364 DOI: 10.3390/cancers10040109] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 03/26/2018] [Accepted: 03/29/2018] [Indexed: 12/12/2022] Open
Abstract
The presence of the Epstein-Barr virus (EBV)-encoded nuclear antigen-1 (EBNA1) protein in all EBV-carrying tumours constitutes a marker that distinguishes the virus-associated cancer cells from normal cells and thereby offers opportunities for targeted therapeutic intervention. EBNA1 is essential for viral genome maintenance and also for controlling viral gene expression and without EBNA1, the virus cannot persist. EBNA1 itself has been linked to cell transformation but the underlying mechanism of its oncogenic activity has been unclear. However, recent data are starting to shed light on its growth-promoting pathways, suggesting that targeting EBNA1 can have a direct growth suppressing effect. In order to carry out its tasks, EBNA1 interacts with cellular factors and these interactions are potential therapeutic targets, where the aim would be to cripple the virus and thereby rid the tumour cells of any oncogenic activity related to the virus. Another strategy to target EBNA1 is to interfere with its expression. Controlling the rate of EBNA1 synthesis is critical for the virus to maintain a sufficient level to support viral functions, while at the same time, restricting expression is equally important to prevent the immune system from detecting and destroying EBNA1-positive cells. To achieve this balance EBNA1 has evolved a unique repeat sequence of glycines and alanines that controls its own rate of mRNA translation. As the underlying molecular mechanisms for how this repeat suppresses its own rate of synthesis in cis are starting to be better understood, new therapeutic strategies are emerging that aim to modulate the translation of the EBNA1 mRNA. If translation is induced, it could increase the amount of EBNA1-derived antigenic peptides that are presented to the major histocompatibility (MHC) class I pathway and thus, make EBV-carrying cancers better targets for the immune system. If translation is further suppressed, this would provide another means to cripple the virus.
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Farina A, Peruzzi G, Lacconi V, Lenna S, Quarta S, Rosato E, Vestri AR, York M, Dreyfus DH, Faggioni A, Morrone S, Trojanowska M, Farina GA. Epstein-Barr virus lytic infection promotes activation of Toll-like receptor 8 innate immune response in systemic sclerosis monocytes. Arthritis Res Ther 2017; 19:39. [PMID: 28245863 PMCID: PMC5331713 DOI: 10.1186/s13075-017-1237-9] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 01/16/2017] [Indexed: 01/15/2023] Open
Abstract
Background Monocytes/macrophages are activated in several autoimmune diseases, including systemic sclerosis (scleroderma; SSc), with increased expression of interferon (IFN)-regulatory genes and inflammatory cytokines, suggesting dysregulation of the innate immune response in autoimmunity. In this study, we investigated whether the lytic form of Epstein-Barr virus (EBV) infection (infectious EBV) is present in scleroderma monocytes and contributes to their activation in SSc. Methods Monocytes were isolated from peripheral blood mononuclear cells (PBMCs) depleted of the CD19+ cell fraction, using CD14/CD16 negative-depletion. Circulating monocytes from SSc and healthy donors (HDs) were infected with EBV. Gene expression of innate immune mediators were evaluated in EBV-infected monocytes from SSc and HDs. Involvement of Toll-like receptor (TLR)8 in viral-mediated TLR8 response was investigated by comparing the TLR8 expression induced by infectious EBV to the expression stimulated by CL075/TLR8/agonist-ligand in the presence of TLR8 inhibitor in THP-1 cells. Results Infectious EBV strongly induced TLR8 expression in infected SSc and HD monocytes in vitro. Markers of activated monocytes, such as IFN-regulated genes and chemokines, were upregulated in SSc- and HD-EBV-infected monocytes. Inhibiting TLR8 expression reduced virally induced TLR8 in THP-1 infected cells, demonstrating that innate immune activation by infectious EBV is partially dependent on TLR8. Viral mRNA and proteins were detected in freshly isolated SSc monocytes. Microarray analysis substantiated the evidence of an increased IFN signature and altered level of TLR8 expression in SSc monocytes carrying infectious EBV compared to HD monocytes. Conclusion This study provides the first evidence of infectious EBV in monocytes from patients with SSc and links EBV to the activation of TLR8 and IFN innate immune response in freshly isolated SSc monocytes. This study provides the first evidence of EBV replication activating the TLR8 molecular pathway in primary monocytes. Immunogenicity of infectious EBV suggests a novel mechanism mediating monocyte inflammation in SSc, by which EBV triggers the innate immune response in infected cells. Electronic supplementary material The online version of this article (doi:10.1186/s13075-017-1237-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Antonella Farina
- Rheumatology, Boston University School of Medicine, Arthritis Center, 72 E. Concord Street, E-5, Boston, MA, 02118, USA.,Department of Experimental Medicine, Sapienza University, Rome, Italy
| | | | - Valentina Lacconi
- Rheumatology, Boston University School of Medicine, Arthritis Center, 72 E. Concord Street, E-5, Boston, MA, 02118, USA
| | - Stefania Lenna
- Rheumatology, Boston University School of Medicine, Arthritis Center, 72 E. Concord Street, E-5, Boston, MA, 02118, USA
| | - Silvia Quarta
- Department of Clinical Medicine, Sapienza University, Rome, Italy
| | - Edoardo Rosato
- Department of Clinical Medicine, Sapienza University, Rome, Italy
| | | | - Michael York
- Rheumatology, Boston University School of Medicine, Arthritis Center, 72 E. Concord Street, E-5, Boston, MA, 02118, USA
| | | | - Alberto Faggioni
- Department of Experimental Medicine, Sapienza University, Rome, Italy
| | - Stefania Morrone
- Department of Experimental Medicine, Sapienza University, Rome, Italy
| | - Maria Trojanowska
- Rheumatology, Boston University School of Medicine, Arthritis Center, 72 E. Concord Street, E-5, Boston, MA, 02118, USA
| | - G Alessandra Farina
- Rheumatology, Boston University School of Medicine, Arthritis Center, 72 E. Concord Street, E-5, Boston, MA, 02118, USA.
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Daramola O, Stevenson J, Dean G, Hatton D, Pettman G, Holmes W, Field R. A high-yielding CHO transient system: Coexpression of genes encoding EBNA-1 and GS enhances transient protein expression. Biotechnol Prog 2013; 30:132-41. [DOI: 10.1002/btpr.1809] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Revised: 08/08/2013] [Indexed: 12/19/2022]
Affiliation(s)
- Olalekan Daramola
- Cell Sciences; Biopharmaceutical Development, MedImmune; Cambridge CB21 6GH U.K
| | - Jessica Stevenson
- Cell Sciences; Biopharmaceutical Development, MedImmune; Cambridge CB21 6GH U.K
| | - Greg Dean
- Cell Sciences; Biopharmaceutical Development, MedImmune; Cambridge CB21 6GH U.K
| | - Diane Hatton
- Cell Sciences; Biopharmaceutical Development, MedImmune; Cambridge CB21 6GH U.K
| | - Gary Pettman
- Cell Sciences; Biopharmaceutical Development, MedImmune; Cambridge CB21 6GH U.K
| | - William Holmes
- Cell Sciences; Biopharmaceutical Development, MedImmune; Cambridge CB21 6GH U.K
| | - Ray Field
- Cell Sciences; Biopharmaceutical Development, MedImmune; Cambridge CB21 6GH U.K
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Potential cellular functions of Epstein-Barr Nuclear Antigen 1 (EBNA1) of Epstein-Barr Virus. Viruses 2013; 5:226-40. [PMID: 23325328 PMCID: PMC3564119 DOI: 10.3390/v5010226] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 12/23/2012] [Accepted: 01/11/2013] [Indexed: 11/17/2022] Open
Abstract
Epstein-Barr Nuclear Antigen 1 (EBNA1) is a multifunctional protein encoded by EBV. EBNA1’s role in maintaining EBV in latently proliferating cells, by mediating EBV genome synthesis and nonrandom partitioning to daughter cells, as well as regulating viral gene transcription, is well characterized. Less understood are the roles of EBNA1 in affecting the host cell to provide selective advantages to those cells that harbor EBV. In this review we will focus on the interactions between EBNA1 and the host cell that may provide EBV-infected cells selective advantages beyond the maintenance of EBV.
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Translating DRiPs: progress in understanding viral and cellular sources of MHC class I peptide ligands. Cell Mol Life Sci 2011; 68:1481-9. [PMID: 21416150 DOI: 10.1007/s00018-011-0656-z] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Revised: 02/17/2011] [Accepted: 02/18/2011] [Indexed: 11/27/2022]
Abstract
It has been 15 years since we proposed the defective ribosomal product (DRiP) hypothesis to explain the rapid presentation of viral peptides by MHC class I molecules on the surface of infected cells. Here, we review the evidence for the contribution of DRiPs to antigen processing, pointing to the uncertainties regarding the physical nature of DRiPs, and emphasizing recent findings suggesting that peptide generation is a specialized process involving compartmentalized translation.
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Ressing ME, Horst D, Griffin BD, Tellam J, Zuo J, Khanna R, Rowe M, Wiertz EJHJ. Epstein-Barr virus evasion of CD8(+) and CD4(+) T cell immunity via concerted actions of multiple gene products. Semin Cancer Biol 2008; 18:397-408. [PMID: 18977445 DOI: 10.1016/j.semcancer.2008.10.008] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Upon primary infection, EBV establishes a latent infection in B cells, characterized by maintenance of the viral genome in the absence of viral replication. The Epstein-Barr Nuclear Antigen 1 (EBNA1) plays a crucial role in maintenance of the viral DNA episome and is consistently expressed in all EBV-associated malignancies. Compared to other EBV latent gene products, EBNA1 is poorly recognized by CD8(+) T lymphocytes. Recent studies are discussed that shed new light on the mechanisms that underlie this unusual lack of CD8(+) T cell activation. Whereas the latent phase is characterized by the expression of a limited subset of viral gene products, the full repertoire of over 80 EBV lytic gene products is expressed during the replicative phase. Despite this abundance of potential T cell antigens, which indeed give rise to a strong response of CD4(+) and CD8(+) T lymphocytes, the virus can replicate successfully. Evidence is accumulating that this paradoxical situation is the result of actions of multiple viral gene products, inhibiting discrete stages of the MHC class I and class II antigen presentation pathways. Immediately after initiation of the lytic cycle, BNLF2a prevents peptide-loading of MHC class I molecules through inhibition of the Transporter associated with Antigen Processing, TAP. This will reduce presentation of viral antigens by the large ER-resident pool of MHC class I molecules. Synthesis of new MHC class I molecules is blocked by BGLF5. Viral-IL10 causes a reduction in mRNA levels of TAP1 and bli/LMP2, a subunit of the immunoproteasome. MHC class I molecules present at the cell surface are downregulated by BILF1. Also the antigen presenting capacity of MHC class II molecules is severely compromised by multiple EBV lytic gene products, including gp42/gH/gL, BGLF5, and vIL-10. In this review, we discuss how concerted actions of these EBV lytic proteins result in highly effective interference with CD8(+) and CD4(+) T cell surveillance, thereby providing the virus with a window for undisturbed generation of viral progeny.
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Affiliation(s)
- Maaike E Ressing
- Department of Medical Microbiology, Center of Infectious Diseases, Leiden University Medical Center (LUMC), Leiden, The Netherlands
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8
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Regulation of protein translation through mRNA structure influences MHC class I loading and T cell recognition. Proc Natl Acad Sci U S A 2008; 105:9319-24. [PMID: 18591662 DOI: 10.1073/pnas.0801968105] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Many viruses avoid immune surveillance during latent infection through reduction in the synthesis of virally encoded proteins. Although antigen presentation critically depends on the level of viral protein synthesis, the precise mechanism used to regulate the generation of antigenic peptide precursors remains elusive. Here, we demonstrate that a purine overloaded virally encoded mRNA lacking secondary structure significantly impacts the efficiency of protein translation and prevents endogenous antigen presentation. Reducing this purine bias through the generation of constructs expressing codon-modified sequences, while maintaining the encoded protein sequence, increased the stem-loop structure of the corresponding mRNA and dramatically enhanced self-synthesis of the viral protein. As a consequence, a higher number of HLA-peptide complexes were detected on the surface of cells expressing this viral protein. Furthermore, these cells were more efficiently recognized by virus-specific T cells compared with those expressing the same antigen expressed by a purine-biased mRNA. These findings delineate a mechanism by which viruses regulate self-synthesis of proteins and offer an effective strategy to evade CD8(+) T cell-mediated immune regulation.
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Tellam J, Rist M, Connolly G, Webb N, Fazou C, Wang F, Khanna R. Translation efficiency of EBNA1 encoded by lymphocryptoviruses influences endogenous presentation of CD8+ T cell epitopes. Eur J Immunol 2007; 37:328-37. [PMID: 17236233 DOI: 10.1002/eji.200636153] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Lymphocryptoviruses (LCV) that infect humans and Old World primates display a significant degree of genetic identity. These viruses use B lymphocytes as primary host cells to establish a long-term latent infection and express highly homologous latent viral proteins. Of particular interest is the expression of the EBV-encoded nuclear antigen-1 (EBNA1), which plays a crucial role in maintaining the viral genome in B cells. Using human and Old World primate homologues of EBNA1, we show that the internal repeat sequences differentially influence their in vitro translation efficiency. Although the glycine-alanine repeat domain of human LCV (EBV) EBNA1 inhibits its self-synthesis, the repeat domains within the simian LCV homologues of EBNA1 do not inhibit self-synthesis. As a consequence, simian LCV EBNA1-expressing cells are more efficiently recognized by virus-specific CTL when compared to human EBV EBNA1, even though both proteins are highly stable in B cells. Interestingly, we also show that similar to human EBNA1, CD8+ T cell epitopes from simian LCV EBNA1 are predominantly derived from newly synthesized protein rather than the long-lived pool of stable protein. These observations provide additional evidence that supports the theory that immune recognition of EBNA1 can occur without compromising the biological maintenance function of this protein.
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Affiliation(s)
- Judy Tellam
- Australian Centre for Vaccine Development and Tumour Immunology Laboratory, Division of Infectious Diseases and Immunology, Clive Berghofer Cancer Research Centre, Queensland Institute of Medical Research, Brisbane, Australia
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Yewdell JW, Haeryfar SMM. Understanding presentation of viral antigens to CD8+ T cells in vivo: the key to rational vaccine design. Annu Rev Immunol 2005; 23:651-82. [PMID: 15771583 DOI: 10.1146/annurev.immunol.23.021704.115702] [Citation(s) in RCA: 173] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
CD8+ T cells play a critical role in antiviral immunity by exerting direct antiviral activity against infected cells. Because of their ability to recognize all types of viral proteins, they offer the promise of providing broad immunity to viruses that evade humoral immunity by varying their surface proteins. Consequently, there is considerable interest in developing vaccines that elicit effective antiviral T(CD8+) responses. Generating optimal vaccines ultimately requires rational design based on detailed knowledge of how T(CD8+) are activated in vivo under natural circumstances. Here we review recent progress obtained largely by in vivo studies in mice to understand the mechanistic basis for activation of naive T(CD8+) in virus infections. These studies point the way to detailed understanding and provide some key information for vaccine development, although much remains to be learned to enable truly rational vaccine design.
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Affiliation(s)
- Jonathan W Yewdell
- Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892-0440, USA.
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Damania B. Oncogenic gamma-herpesviruses: comparison of viral proteins involved in tumorigenesis. Nat Rev Microbiol 2004; 2:656-68. [PMID: 15263900 DOI: 10.1038/nrmicro958] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Blossom Damania
- Lineberger Comprehensive Cancer Center, Department of Microbiology & Immunology, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
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