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Epstein-Barr Virus and the Pathogenesis of Diffuse Large B-Cell Lymphoma. Life (Basel) 2023; 13:life13020521. [PMID: 36836878 PMCID: PMC9967091 DOI: 10.3390/life13020521] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/10/2023] [Accepted: 02/11/2023] [Indexed: 02/17/2023] Open
Abstract
Epstein-Barr virus (EBV), defined as a group I carcinogen by the World Health Organization (WHO), is present in the tumour cells of patients with different forms of B-cell lymphoma, including Burkitt lymphoma, Hodgkin lymphoma, post-transplant lymphoproliferative disorders, and, most recently, diffuse large B-cell lymphoma (DLBCL). Understanding how EBV contributes to the development of these different types of B-cell lymphoma has not only provided fundamental insights into the underlying mechanisms of viral oncogenesis, but has also highlighted potential new therapeutic opportunities. In this review, we describe the effects of EBV infection in normal B-cells and we address the germinal centre model of infection and how this can lead to lymphoma in some instances. We then explore the recent reclassification of EBV+ DLBCL as an established entity in the WHO fifth edition and ICC 2022 classifications, emphasising the unique nature of this entity. To that end, we also explore the unique genetic background of this entity and briefly discuss the potential role of the tumour microenvironment in lymphomagenesis and disease progression. Despite the recent progress in elucidating the mechanisms of this malignancy, much work remains to be done to improve patient stratification, treatment strategies, and outcomes.
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Differential epigenetic regulation between the alternative promoters, PRDM1α and PRDM1β, of the tumour suppressor gene PRDM1 in human multiple myeloma cells. Sci Rep 2020; 10:15899. [PMID: 32985591 PMCID: PMC7522722 DOI: 10.1038/s41598-020-72946-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Accepted: 09/07/2020] [Indexed: 12/23/2022] Open
Abstract
Multiple myeloma (MM) is a B-cell neoplasm that is characterized by the accumulation of malignant plasma cells in the bone marrow. The transcription factor PRDM1 is a master regulator of plasma cell development and is considered to be an oncosuppressor in several lymphoid neoplasms. The PRDM1β isoform is an alternative promoter of the PRDM1 gene that may interfere with the normal role of the PRDM1α isoform. To explain the induction of the PRDM1β isoform in MM and to offer potential therapeutic strategies to modulate its expression, we characterized the cis regulatory elements and epigenetic status of its promoter. We observed unexpected patterns of hypermethylation and hypomethylation at the PRDM1α and PRDM1β promoters, respectively, and prominent H3K4me1 and H3K9me2 enrichment at the PRDM1β promoter in non-expressing cell lines compared to PRDM1β-expressing cell lines. After treatment with drugs that inhibit DNA methylation, we were able to modify the activity of the PRDM1β promoter but not that of the PRDM1α promoter. Epigenetic drugs may offer the ability to control the expression of the PRDM1α/PRDM1β promoters as components of novel therapeutic approaches.
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Sphingosine-1-phosphate signalling drives an angiogenic transcriptional programme in diffuse large B cell lymphoma. Leukemia 2019; 33:2884-2897. [PMID: 31097785 PMCID: PMC6887546 DOI: 10.1038/s41375-019-0478-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 02/26/2019] [Accepted: 04/01/2019] [Indexed: 12/15/2022]
Abstract
Although the over-expression of angiogenic factors is reported in diffuse
large B-cell lymphoma (DLBCL), the poor response to anti-VEGF drugs observed in
clinical trials suggests that angiogenesis in these tumours might be driven by
VEGF-independent pathways. We show that sphingosine kinase-1 (SPHK1), which
generates the potent bioactive sphingolipid sphingosine-1-phosphate (S1P), is
over-expressed in DLBCL. A meta-analysis of over 2000 cases revealed that genes
correlated with SPHK1 mRNA expression in DLBCL were significantly enriched for
tumour angiogenesis meta-signature genes; an effect evident in both major cell
of origin (COO) and stromal subtypes. Moreover, we found that S1P induces
angiogenic signalling and a gene expression programme that is present within the
tumour vasculature of SPHK1-expressing DLBCL. Importantly, S1PR1 functional
antagonists, including Siponimod, and the S1P neutralising antibody, Sphingomab,
inhibited S1P signalling in DLBCL cells in vitro. Furthermore,
Siponimod, also reduced angiogenesis and tumour growth in an S1P-producing mouse
model of angiogenic DLBCL. Our data define a potential role for S1P signalling
in driving an angiogenic gene expression programme in the tumour vasculature of
DLBCL and suggest novel opportunities to target S1P-mediated angiogenesis in
patients with DLBCL.
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Frost TC, Gewurz BE. Epigenetic crossroads of the Epstein-Barr virus B-cell relationship. Curr Opin Virol 2018; 32:15-23. [PMID: 30227386 DOI: 10.1016/j.coviro.2018.08.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 08/24/2018] [Indexed: 12/14/2022]
Abstract
Epstein-Barr virus (EBV) is a gamma-herpesvirus that establishes lifelong infection in the majority of people worldwide. EBV uses epigenetic reprogramming to switch between multiple latency states in order to colonize the memory B-cell compartment and to then periodically undergo lytic reactivation upon plasma cell differentiation. This review focuses on recent advances in the understanding of epigenetic mechanisms that EBV uses to control its lifecycle and to subvert the growth and survival pathways that underly EBV-driven B-cell differentiation versus B-cell growth transformation, a hallmark of the first human tumor virus. These include the formation of viral super enhancers that drive expression of key host dependency factors, evasion of tumor suppressor responses, prevention of plasmablast differentiation, and regulation of the B-cell lytic switch.
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Affiliation(s)
- Thomas C Frost
- Graduate Program in Virology, Harvard Medical School, Boston, MA, 02115, USA
| | - Benjamin E Gewurz
- Graduate Program in Virology, Harvard Medical School, Boston, MA, 02115, USA; Division of Infectious Disease, Department of Medicine, Brigham & Women's Hospital, Boston, MA, 02115, USA; Department of Microbiology, Harvard Medical School, Boston, MA, 02115, USA; Broad Institute of Harvard and Massachusetts Institute of Technology, Cambridge, MA, 02142, USA.
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Vrzalikova K, Ibrahim M, Vockerodt M, Perry T, Margielewska S, Lupino L, Nagy E, Soilleux E, Liebelt D, Hollows R, Last A, Reynolds G, Abdullah M, Curley H, Care M, Krappmann D, Tooze R, Allegood J, Spiegel S, Wei W, Woodman CBJ, Murray PG. S1PR1 drives a feedforward signalling loop to regulate BATF3 and the transcriptional programme of Hodgkin lymphoma cells. Leukemia 2018; 32:214-223. [PMID: 28878352 PMCID: PMC5737877 DOI: 10.1038/leu.2017.275] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 08/09/2017] [Accepted: 08/14/2017] [Indexed: 12/15/2022]
Abstract
The Hodgkin/Reed-Sternberg cells of classical Hodgkin lymphoma (HL) are characterised by the aberrant activation of multiple signalling pathways. Here we show that a subset of HL displays altered expression of sphingosine-1-phosphate (S1P) receptors (S1PR)s. S1P activates phosphatidylinositide 3-kinase (PI3-K) in these cells that is mediated by the increased expression of S1PR1 and the decreased expression of S1PR2. We also showed that genes regulated by the PI3-K signalling pathway in HL cell lines significantly overlap with the transcriptional programme of primary HRS cells. Genes upregulated by the PI3-K pathway included the basic leucine zipper transcription factor, ATF-like 3 (BATF3), which is normally associated with the development of dendritic cells. Immunohistochemistry confirmed that BATF3 was expressed in HRS cells of most HL cases. In contrast, in normal lymphoid tissues, BATF3 expression was confined to a small fraction of CD30-positive immunoblasts. Knockdown of BATF3 in HL cell lines revealed that BATF3 contributed to the transcriptional programme of primary HRS cells, including the upregulation of S1PR1. Our data suggest that disruption of this potentially oncogenic feedforward S1P signalling loop could provide novel therapeutic opportunities for patients with HL.
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Affiliation(s)
- K Vrzalikova
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - M Ibrahim
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - M Vockerodt
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
- Institute of Anatomy and Cell Biology, Georg-August University of Göttingen, Göttingen, Germany
| | - T Perry
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - S Margielewska
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - L Lupino
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - E Nagy
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - E Soilleux
- Department of Cellular Pathology, John Radcliffe Hospital, Oxford, UK
| | - D Liebelt
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - R Hollows
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - A Last
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - G Reynolds
- Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK
| | - M Abdullah
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
- Department of Pathology, Universiti Putra Malaysia, Selangor, Malaysia
| | - H Curley
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - M Care
- Leeds Institute of Cancer and Pathology, University of Leeds, Leeds, UK
| | - D Krappmann
- Research Unit Cellular Signal Integration, Helmholtz Zentrum München, Neuherberg, Germany
| | - R Tooze
- Leeds Institute of Cancer and Pathology, University of Leeds, Leeds, UK
| | - J Allegood
- Department of Biochemistry and Molecular Biology and Massey Cancer Center, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - S Spiegel
- Department of Biochemistry and Molecular Biology and Massey Cancer Center, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - W Wei
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
- Sheffield Institute of Translational Neuroscience, University of Sheffield, Sheffield, UK
| | - C B J Woodman
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - P G Murray
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
- Department of Clinical and Molecular Pathology, Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
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Murray P, Bell A. Contribution of the Epstein-Barr Virus to the Pathogenesis of Hodgkin Lymphoma. Curr Top Microbiol Immunol 2015; 390:287-313. [PMID: 26424651 DOI: 10.1007/978-3-319-22822-8_12] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The morphology of the pathognomonic Hodgkin and Reed-Sternberg cells (HRS) of Hodgkin lymphoma was described over a century ago, yet it was only relatively recently that the B-cell origin of these cells was identified. In a proportion of cases, HRS cells harbour monoclonal forms of the B lymphotropic Epstein-Barr virus (EBV). This review summarises current knowledge of the pathogenesis of Hodgkin lymphoma with a particular emphasis on the contribution of EBV.
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Affiliation(s)
- Paul Murray
- School of Cancer Sciences and Centre for Human Virology, College of Medical and Dental Sciences, University of Birmingham, Birmingham, Edgbaston, B15 2TT, UK.
| | - Andrew Bell
- School of Cancer Sciences and Centre for Human Virology, College of Medical and Dental Sciences, University of Birmingham, Birmingham, Edgbaston, B15 2TT, UK.
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Cellular differentiation regulator BLIMP1 induces Epstein-Barr virus lytic reactivation in epithelial and B cells by activating transcription from both the R and Z promoters. J Virol 2014; 89:1731-43. [PMID: 25410866 DOI: 10.1128/jvi.02781-14] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
UNLABELLED Epstein-Barr virus (EBV) maintains a lifelong latent infection within a subset of its host's memory B cells, while lytic EBV replication takes place in plasma cells and differentiated epithelial cells. Therefore, cellular transcription factors, such as BLIMP1, that are key mediators of differentiation likely contribute to the EBV latent-to-lytic switch. Previous reports showed that ectopic BLIMP1 expression induces reactivation in some EBV-positive (EBV(+)) B-cell lines and transcription from Zp, with all Z(+) cells in oral hairy leukoplakia being BLIMP1(+). Here, we examined BLIMP1's role in inducing EBV lytic gene expression in numerous EBV(+) epithelial and B-cell lines and activating transcription from Rp. BLIMP1 addition was sufficient to induce reactivation in latently infected epithelial cells derived from gastric cancers, nasopharyngeal carcinomas, and normal oral keratinocytes (NOK) as well as some, but not all B-cell lines. BLIMP1 strongly induced transcription from Rp as well as Zp, with there being three or more synergistically acting BLIMP1-responsive elements (BRE) within Rp. BLIMP1's DNA-binding domain was required for reactivation, but BLIMP1 did not directly bind the nucleotide (nt) -660 Rp BRE. siRNA knockdown of BLIMP1 inhibited 12-O-tetradecanoyl-phorbol-13-acetate (TPA)-induced lytic reactivation in NOK-Akata cells, cells that can be reactivated by R, but not Z. Thus, we conclude that BLIMP1 expression is both necessary and sufficient to induce EBV lytic replication in many (possibly all) EBV(+) epithelial-cell types, but in only a subset of EBV(+) B-cell types; it does so, at least in part, by strongly activating expression of both EBV immediately early genes, BZLF1 and BRLF1. IMPORTANCE This study is the first one to show that the cellular transcription factor BLIMP1, a key player in both epithelial and B-cell differentiation, induces reactivation of the oncogenic herpesvirus Epstein-Barr virus (EBV) out of latency into lytic replication in a variety of cancerous epithelial cell types as well as in some, but not all, B-cell types that contain this virus in a dormant state. The mechanism by which BLIMP1 does so involves strongly turning on expression of both of the immediate early genes of the virus, probably by directly acting upon the promoters as part of protein complexes or indirectly by altering the expression or activities of some cellular transcription factors and signaling pathways. The fact that EBV(+) cancers usually contain mostly undifferentiated cells may be due in part to these cells dying from lytic EBV infection when they differentiate and express wild-type BLIMP1.
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