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EBV reactivation

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https://www.readbyqxmd.com/read/28624961/phenotypic-and-functional-characterization-of-t-cells-in-white-matter-lesions-of-multiple-sclerosis-patients
#1
Gijsbert P van Nierop, Marvin M van Luijn, Samira S Michels, Marie-Jose Melief, Malou Janssen, Anton W Langerak, Werner J D Ouwendijk, Rogier Q Hintzen, Georges M G M Verjans
T cells are considered pivotal in the pathology of multiple sclerosis (MS), but their function and antigen specificity are unknown. To unravel the role of T cells in MS pathology, we performed a comprehensive analysis on T cells recovered from paired blood, cerebrospinal fluid (CSF), normal-appearing white matter (NAWM) and white matter lesions (WML) from 27 MS patients with advanced disease shortly after death. The differentiation status of T cells in these compartments was determined by ex vivo flow cytometry and immunohistochemistry...
June 17, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28617871/hypoxia-inducible-factor-1%C3%AE-plays-roles-in-epstein-barr-virus-s-natural-life-cycle-and-tumorigenesis-by-inducing-lytic-infection-through-direct-binding-to-the-immediate-early-bzlf1-gene-promoter
#2
Richard J Kraus, Xianming Yu, Blue-Leaf A Cordes, Saraniya Sathiamoorthi, Tawin Iempridee, Dhananjay M Nawandar, Shidong Ma, James C Romero-Masters, Kyle G McChesney, Zhen Lin, Kathleen R Makielski, Denis L Lee, Paul F Lambert, Eric C Johannsen, Shannon C Kenney, Janet E Mertz
When confronted with poor oxygenation, cells adapt by activating survival signaling pathways, including the oxygen-sensitive transcriptional regulators called hypoxia-inducible factor alphas (HIF-αs). We report here that HIF-1α also regulates the life cycle of Epstein-Barr virus (EBV). Incubation of EBV-positive gastric carcinoma AGS-Akata and SNU-719 and Burkitt lymphoma Sal and KemIII cell lines with a prolyl hydroxylase inhibitor, L-mimosine or deferoxamine, or the NEDDylation inhibitor MLN4924 promoted rapid and sustained accumulation of both HIF-1α and lytic EBV antigens...
June 15, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28604802/serological-profiling-of-the-ebv-immune-response-in-chronic-fatigue-syndrome-using-a-peptide-microarray
#3
Madlen Loebel, Maren Eckey, Franziska Sotzny, Elisabeth Hahn, Sandra Bauer, Patricia Grabowski, Johannes Zerweck, Pavlo Holenya, Leif G Hanitsch, Kirsten Wittke, Peter Borchmann, Jens-Ulrich Rüffer, Falk Hiepe, Klemens Ruprecht, Uta Behrends, Carola Meindl, Hans-Dieter Volk, Ulf Reimer, Carmen Scheibenbogen
BACKGROUND: Epstein-Barr-Virus (EBV) plays an important role as trigger or cofactor for various autoimmune diseases. In a subset of patients with Chronic Fatigue Syndrome (CFS) disease starts with infectious mononucleosis as late primary EBV-infection, whereby altered levels of EBV-specific antibodies can be observed in another subset of patients. METHODS: We performed a comprehensive mapping of the IgG response against EBV comparing 50 healthy controls with 92 CFS patients using a microarray platform...
2017: PloS One
https://www.readbyqxmd.com/read/28588024/bet-inhibitors-block-the-epstein-barr-virus-lytic-cycle-at-two-distinct-steps
#4
Kristin M Keck, Stephanie A Moquin, Amanda He, Samantha G Fernandez, Jessica J Somberg, Stephanie M Liu, Delsy M Martinez, Jj L Miranda
Lytic infection by the Epstein-Barr virus (EBV) poses numerous health risks, such as infectious mononucleosis and lymphoproliferative disorder. Proteins in the bromodomain and extraterminal (BET) family regulate multiple stages of viral life cycles and provide promising intervention targets. Synthetic small molecules can bind to the bromodomains and disrupt function by preventing recognition of acetylated lysine substrates. We demonstrate that JQ1 and other BET inhibitors block two different steps in the sequential cascade of the EBV lytic cycle...
June 6, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28581032/preemptive-therapy-with-rituximab-for-epstein-barr-virus-reactivation-after-haplo-hsct
#5
Shogo Kobayashi, Hideki Sano, Kazuhiro Mochizuki, Yoshihiro Ohara, Nobuhisa Takahashi, Hitoshi Ohto, Atsushi Kikuta
BACKGROUND: Epstein-Barr virus-related post-transplantation lymphoproliferative disorder (EBV-PTLD) is a serious complication in hematopoietic stem cell transplantation (HSCT) recipients. METHODS: We conducted a retrospective study to investigate the incidence and potential risk factors for EBV reactivation and to assess the efficacy of the management of EBV reactivation with preemptive rituximab in children who had T-cell-replete haploidentical HSCT (TCR-haplo-SCT) with low-dose anti-thymocyte globulin (ATG)...
June 5, 2017: Pediatrics International: Official Journal of the Japan Pediatric Society
https://www.readbyqxmd.com/read/28574826/leflunomide-teriflunomide-inhibit-epstein-barr-virus-ebv-induced-lymphoproliferative-disease-and-lytic-viral-replication
#6
Andrea Bilger, Julie Plowshay, Shidong Ma, Dhananjay Nawandar, Elizabeth A Barlow, James C Romero-Masters, Jillian A Bristol, Zhe Li, Ming-Han Tsai, Henri-Jacques Delecluse, Shannon C Kenney
EBV infection causes mononucleosis and is associated with specific subsets of B cell lymphomas. Immunosuppressed patients such as organ transplant recipients are particularly susceptible to EBV-induced lymphoproliferative disease (LPD), which can be fatal. Leflunomide (a drug used to treat rheumatoid arthritis) and its active metabolite teriflunomide (used to treat multiple sclerosis) inhibit de novo pyrimidine synthesis by targeting the cellular dihydroorotate dehydrogenase, thereby decreasing T cell proliferation...
May 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28573910/haploidentical-hematopoietic-stem-cell-transplantation-for-adult-patients-with-epstein-barr-virus-associated-hemophagocytic-lymphohistiocytosis
#7
Zhihui Li, Yini Wang, Jingshi Wang, Jia Zhang, Zhao Wang
To assess the efficacy of haploidentical hematopoietic stem cell transplantation (HSCT) in adult patients with Epstein-Barr virus-associated hemophagocytic lymphohistiocytosis (EBV-HLH), we retrospectively analyzed 30 cases that presented at our institution. At the time of HSCT, 20 patients (66.7%) had achieved a response after receiving HLH-94 or salvage therapies. All patients underwent myeloablative conditioning followed by peripheral blood HSCT from their related, haploidentical donors. Twenty-six patients (86...
June 2, 2017: Leukemia & Lymphoma
https://www.readbyqxmd.com/read/28572837/serum-ebv-antibodies-and-lmp-1-in-polish-patients-with-oropharyngeal-and-laryngeal-cancer
#8
Sylwia Fołtyn, Małgorzata Strycharz-Dudziak, Bartłomiej Drop, Anastazja Boguszewska, Małgorzata Polz-Dacewicz
BACKGROUND: The association between Epstein-Barr virus (EBV) and the development of head and neck cancer was reported by many researchers. The aim of the present study was to detect EBV DNA and EBV antibodies in 110 Polish patients with oropharyngeal and laryngeal cancer compared to 40 healthy individuals. METHODS: Frozen tumor tissue fragments were tested using nested PCR assay for EBV DNA detection. Sera from all individuals were investigated using ELISA tests to detect the presence of VCA IgM and IgG, EBNA IgG, EA IgG...
2017: Infectious Agents and Cancer
https://www.readbyqxmd.com/read/28571118/the-role-of-oxidative-stress-in-ebv-lytic-reactivation-radioresistance-and-the-potential-preventive-and-therapeutic-implications
#9
REVIEW
Jianmin Hu, Hongde Li, Xiangjian Luo, Yueshuo Li, Ann Bode, Ya Cao
Epstein-Barr virus (EBV) is an important cancer causing virus. Cancer associated with EBV account for approximately 1.5% of all cancers, and represent 1.8% of all cancer deaths worldwide. EBV reactivation plays an important role in the development of EBV-related diseases and is closely related with patients' survival and clinical stages of EBV-related cancers. The therapy regarding to EBV-related cancers is very urgent, especially in endemic areas. Generating oxidative stress is a critical mechanism by which host cells defend against infection by virus...
June 1, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28560170/rna-seq-detects-pharmacological-inhibition-of-epstein-barr-virus-late-transcription-during-spontaneous-reactivation
#10
An T Phan, Delsy M Martinez, Jj L Miranda
The stepwise and sequential expression of viral genes underlies progression of the infectious life cycle. The Epstein-Barr virus (EBV) is both a tractable model for elucidating principles of transcription as well as a global health threat. We describe an experimental protocol and bioinformatics pipeline for functional identification of EBV true late genes, the last step of transcription prior to virion packaging and egress. All data have been uploaded to the Gene Expression Omnibus under accession code GSE96689...
September 2017: Genomics Data
https://www.readbyqxmd.com/read/28549714/the-enigmatic-role-of-viruses-in-multiple-sclerosis-molecular-mimicry-or-disturbed-immune-surveillance
#11
REVIEW
Jens Geginat, Moira Paroni, Massimiliano Pagani, Daniela Galimberti, Raffaele De Francesco, Elio Scarpini, Sergio Abrignani
Multiple sclerosis (MS) is a T cell driven autoimmune disease of the central nervous system (CNS). Despite its association with Epstein-Barr Virus (EBV), how viral infections promote MS remains unclear. However, there is increasing evidence that the CNS is continuously surveyed by virus-specific T cells, which protect against reactivating neurotropic viruses. Here, we discuss how viral infections could lead to the breakdown of self-tolerance in genetically predisposed individuals, and how the reactivations of viruses in the CNS could induce the recruitment of both autoaggressive and virus-specific T cell subsets, causing relapses and progressive disability...
May 23, 2017: Trends in Immunology
https://www.readbyqxmd.com/read/28495131/massive-intracerebral-epstein-barr-virus-reactivation-in-lethal-multiple-sclerosis-relapse-after-natalizumab-withdrawal
#12
Barbara Serafini, Eleonora Scorsi, Barbara Rosicarelli, Valérie Rigau, Eric Thouvenot, Francesca Aloisi
Rebound of disease activity in multiple sclerosis patients after natalizumab withdrawal is a potentially life-threatening event. To verify whether highly destructive inflammation after natalizumab withdrawal is associated with Epstein-Barr virus (EBV) reactivation in central nervous system infiltrating B-lineage cells and cytotoxic immunity, we analyzed post-mortem brain tissue from a patient who died during a fulminating MS relapse following natalizumab withdrawal. Numerous EBV infected B cells/plasma cells and CD8+ T cells infiltrated all white matter lesions; the highest frequency of EBV lytically infected cells and granzyme B+ CD8+ T cells was observed in actively demyelinating lesions...
June 15, 2017: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/28490592/epstein-barr-virus-rta-mediated-accumulation-of-dna-methylation-interferes-with-ctcf-binding-in-both-host-and-viral-genomes
#13
Yen-Ju Chen, Yu-Lian Chen, Yao Chang, Chung-Chun Wu, Ying-Chieh Ko, Sai Wah Tsao, Jen-Yang Chen, Su-Fang Lin
Rta, an Epstein-Barr virus (EBV) immediate-early protein, reactivates viral lytic replication that is closely associated with tumorigenesis. In previous studies, we demonstrated that in epithelial cells Rta efficiently induced cellular senescence, which is an irreversible G1 arrest likely to provide a favorable environment for productive replications of EBV and Kaposi's sarcoma-associated herpesvirus (KSHV). To restrict progression of the cell cycle, Rta simultaneously upregulates CDK inhibitors and downregulates MYC, CCND1 and JUN, among others...
May 10, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28487730/the-methylation-status-and-expression-of-epstein-barr-virus-early-genes-barf1-and-bhrf1-in-epstein-barr-virus-associated-gastric-carcinomas
#14
Jing Li, Wen Liu, Kui Che, Yan Zhang, Zhenzhen Zhao, Bing Luo
Epstein-Barr virus (EBV) is an important DNA virus which establishes latent infection in human malignancies. Expression of EBV-encoded genes in the associated tumors is strongly modulated by promoter CpG methylation of EBV genome. This study aimed to explore the methylation status of the promoters of EBV BamHI-A rightward frame 1 (BARF1) and BamHI-H rightward open reading frame 1 (BHRF1) and their influence on transcriptional expression, to further understand the roles of BARF1 and BHRF1 in the occurrence of EBV-associated cancer...
2017: Gastroenterology Research and Practice
https://www.readbyqxmd.com/read/28478837/the-spread-of-ebv-to-ectopic-lymphoid-aggregates-may-be-the-final-common-pathway-in-the-pathogenesis-of-me-cfs
#15
Willy Eriksen
According to the hypothesis presented here, myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) develops over 3 steps: Step 1 is characterized by the aggregation of lymphoid cells in dorsal root ganglia or other nervous structures. The cause of this formation of ectopic lymphoid aggregates may be an acute infection, asymptomatic reactivations of a common neurotropic virus, exposure to a neurotoxin, or physical injury to peripheral nerves. In step 2, Epstein-Barr virus (EBV)-infected lymphocytes or monocytes bring EBV from the circulation to one or several of these lymphoid aggregates, whereupon cell-to-cell transmission of EBV and proliferation of latently EBV-infected lymphocytes lead to the presence of many EBV-infected cells in the lymphoid aggregates...
May 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28456021/parp1-restricts-epstein-barr-virus-lytic-reactivation-by-binding-the-bzlf1-promoter
#16
Lena N Lupey-Green, Stephanie A Moquin, Kayla A Martin, Shane M McDevitt, Michael Hulse, Lisa B Caruso, Richard T Pomerantz, Jj L Miranda, Italo Tempera
The Epstein Barr virus (EBV) genome persists in infected host cells as a chromatinized episome and is subject to chromatin-mediated regulation. Binding of the host insulator protein CTCF to the EBV genome has an established role in maintaining viral latency type, and in other herpesviruses, loss of CTCF binding at specific regions correlates with viral reactivation. Here, we demonstrate that binding of PARP1, an important cofactor of CTCF, at the BZLF1 lytic switch promoter restricts EBV reactivation. Knockdown of PARP1 in the Akata-EBV cell line significantly increases viral copy number and lytic protein expression...
July 2017: Virology
https://www.readbyqxmd.com/read/28452728/cytokine-production-peculiarities-in-different-forms-of-epstein-barr-virus-infection
#17
М Popov, Т Lyadova, О Volobuyeva, N Shepileva, А Kozlov, О Sorokina
In article presented results of the study of basic levels of regulatory cytokines in patients with various forms of Epstein-Barr virus (EBV) infection. Analysis of the dynamics of cytokine profile in patients with EBV infection revealed the opposite changes studied synthesis of proinflammatory and anti-inflammatory cytokines, which was the basis for the establishment of the four types of immune response. The findings confirm the existence of cytokine imbalance with EBV infection. The established types of immune responses indicate inadequate cell humoral reactivity in a long persistence of EBV, which manifests a tendency to suppression of cell-mediated and humoral immune response enhancement mechanisms and displayed in the clinical and biochemical manifestations of the disease, and also leads to prolonged undulating course...
February 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28447898/splenic-epstein-barr-virus-associated-inflammatory-pseudotumor
#18
Chris Van Baeten, Jo Van Dorpe
Splenic inflammatory pseudotumor (IPT) is an uncommon lesion with an inflammatory morphologic aspect that often poses a diagnostic challenge. The etiology of IPT can be infectious, autoimmune, reactive, or neoplastic. Splenic Epstein-Barr virus (EBV)-associated IPTs form a subset of splenic IPTs in which there is a spindle cell component infected by EBV. The best characterized and most frequent subgroup of splenic EBV-associated IPT is IPT-like follicular dendritic cell tumor. This review also focusses on EBV-associated splenic IPTs without follicular dendritic cell marker expression...
May 2017: Archives of Pathology & Laboratory Medicine
https://www.readbyqxmd.com/read/28435676/understanding-cd8-t-cell-responses-toward-the-native-and-alternate-hla-a-02-01-restricted-wt1-epitope
#19
Thi Ho Nguyen, Amabel Cl Tan, Sue D Xiang, Anne Goubier, Kim L Harland, E Bridie Clemens, Magdalena Plebanski, Katherine Kedzierska
The Wilms' tumor 1 (WT1) antigen is expressed in solid and hematological malignancies, but not healthy tissues, making it a promising target for cancer immunotherapies. Immunodominant WT1 epitopes, the native HLA-A2/WT1126-134 (RMFPNAPYL) (HLA-A2/RMFPNAPYL epitope (WT1A)) and its modified variant YMFPNAPYL (HLA-A2/YMFPNAPYL epitope (WT1B)), can induce WT1-specific CD8(+) T cells, although WT1B is more stably bound to HLA-A*02:01. Here, to further determine the benefits of those two targets, we assessed the naive precursor frequencies; immunogenicity and cross-reactivity of CD8(+) T cells directed toward these two WT1 epitopes...
March 2017: Clinical & Translational Immunology
https://www.readbyqxmd.com/read/28414949/ebv-encoded-micrornas-profile-evaluation-in-pediatric-liver-transplant-recipients
#20
Massimiliano Bergallo, Stefano Gambarino, Michele Pinon, Veronica Barat, Paola Montanari, Valentina Daprà, Ilaria Galliano, Pier Luigi Calvo
BACKGROUND: Epstein-Barr virus (EBV) infects 90% of the world population, commonly causing self-limiting infectious mononucleosis or rarely inciting a range of malignancies. EBV microRNAs (miRNAs) were discovered by sequencing libraries of small RNAs generated from several EBV-positive cell lines. Little is known about their roles, but their high stability and easy quantification make these molecules potential biomarkers. OBJECTIVES: In this study a stem-loop MGB real-time RT-PCR has been used to detect and quantify miR-BART2-5p, miR-BART15 and miR-BART22 EBV miRNAs levels...
June 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
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