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https://www.readbyqxmd.com/read/28077791/carcinoma-risk-variant-of-ebna1-deregulates-epstein-barr-virus-episomal-latency
#1
Jayaraju Dheekollu, Kimberly Malecka, Andreas Wiedmer, Henri-Jacques Delecluse, Alan Ks Chiang, Dario C Altieri, Troy E Messick, Paul M Lieberman
Epstein-Barr Virus (EBV) latent infection is a causative co-factor for endemic Nasopharyngeal Carcinoma (NPC). NPC-associated variants have been identified in EBV-encoded nuclear antigen EBNA1. Here, we solve the X-ray crystal structure of an NPC-derived EBNA1 DNA binding domain (DBD) and show that variant amino acids are found on the surface away from the DNA binding interface. We show that NPC-derived EBNA1 is compromised for DNA replication and episome maintenance functions. Recombinant virus containing the NPC EBNA1 DBD are impaired in their ability to immortalize primary B-lymphocytes and suppress lytic transcription during early stages of B-cell infection...
January 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28063010/chaetocin-reactivates-the-lytic-replication-of-epstein-barr-virus-from-latency-via-reactive-oxygen-species
#2
Shilun Zhang, Juan Yin, Jiang Zhong
Oxidative stress, regarded as a negative effect of free radicals in vivo, takes place when organisms suffer from harmful stimuli. Some viruses can induce the release of reactive oxygen species (ROS) in infected cells, which may be closely related with their pathogenicity. In this report, chaetocin, a fungal metabolite reported to have antimicrobial and cytostatic activity, was studied for its effect on the activation of latent Epstein-Barr virus (EBV) in B95-8 cells. We found that chaetocin remarkably up-regulated EBV lytic transcription and DNA replication at a low concentration (50 nmol L(-1))...
January 5, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28039929/epstein-barr-virus-dna-monitoring-in-serum-and-whole-blood-in-pediatric-liver-transplant-recipients-who-do-or-do-not-discontinue-immunosuppressive-therapy
#3
C Kullberg-Lindh, R Saalman, M Olausson, G Herlenius, M Lindh
The rate of PTLD can be reduced by weaned IS guided by monitoring of EBV DNA. In this single-center retrospective case series study, we analyzed how reduction in IS influenced EBV DNA levels in whole blood and serum in 30 children during the first year after liver transplantation, and how these levels were related to symptoms putatively due to EBV. Primary and reactivated EBV infection was seen in 18 (60%) and eight patients (27%), respectively. Thirteen patients (42%) developed chronic high load the first year post-transplant...
December 31, 2016: Pediatric Transplantation
https://www.readbyqxmd.com/read/28032863/short-term-inhibition-of-tert-induces-telomere-length-independent-cell-cycle-arrest-and-apoptotic-response-in-ebv-immortalized-and-transformed-b-cells
#4
Andrea Celeghin, Silvia Giunco, Riccardo Freguja, Manuela Zangrossi, Silvia Nalio, Riccardo Dolcetti, Anita De Rossi
Besides its canonical role in stabilizing telomeres, telomerase reverse transcriptase (TERT) may promote tumorigenesis through extra-telomeric functions. The possible therapeutic effects of BIBR1532 (BIBR), a powerful TERT inhibitor, have been evaluated in different cellular backgrounds, but no data are currently available regarding Epstein-Barr virus (EBV)-driven B-cell malignancies. Our aim was to characterize the biological effects of TERT inhibition by BIBR on EBV-immortalized lymphoblastoid cell lines (LCLs) and fully transformed Burkitt's lymphoma (BL) cell lines...
December 29, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/28031537/activation-of-atr-chk1-pathway-facilitates-ebv-mediated-transformation-of-primary-tonsillar-b-cells
#5
Vanessa Mordasini, Seigo Ueda, Roberta Aslandogmus, Christoph Berger, Claudine Gysin, Daniela Hühn, Alessandro A Sartori, Michele Bernasconi, David Nadal
Primary infection of the immunocompromised host with the oncovirus Epstein-Barr virus (EBV) that targets mainly B-cells is associated with an increased risk for EBV-associated tumors. The early events subsequent to primary infection with potential for B-cell transformation are poorly studied. Here, we modeled in vitro the primary infection by using B-cells isolated from tonsils, the portal of entry of EBV, since species specificity of EBV hampers modeling in experimental animals. Increasing evidence indicates that the host DNA damage response (DDR) can influence and be influenced by EBV infection...
December 23, 2016: Oncotarget
https://www.readbyqxmd.com/read/28029657/prognostication-of-serial-post-intensity-modulated-radiation-therapy-undetectable-plasma-ebv-dna-for-nasopharyngeal-carcinoma
#6
Victor Ho-Fun Lee, Dora Lai-Wan Kwong, To-Wai Leung, Cheuk-Wai Choi, Vincent Lai, Lydia Ng, Ka-On Lam, Sherry Chor-Yi Ng, Chun-Kin Sze, Chi-Chung Tong, Patty Pui-Ying Ho, Wing-Lok Chan, Lai-San Wong, Dennis Kwok-Chuen Leung, Sum-Yin Chan, Pek-Lan Khong
Plasma Epstein-Barr virus (EBV) DNA titers have been used to monitor treatment response and provide prognostic information on survival for nasopharyngeal carcinoma (NPC). However, the long-term prognostic role of pretreatment and posttreatment titers after radical contemporaneous radiation therapy remains uncertain. We recruited 260 evaluable patients with non-metastatic NPC treated with radical intensity-modulated radiation therapy (IMRT) with or without adjunct chemotherapy. Plasma EBV DNA titers at baseline and then 8 weeks and 6 months after IMRT were measured...
December 24, 2016: Oncotarget
https://www.readbyqxmd.com/read/28029001/performance-of-the-real-q-ebv-quantification-kit-for-epstein-barr-virus-dna-quantification-in-whole-blood
#7
Hee Jae Huh, Jong Eun Park, Ji Youn Kim, Sun Ae Yun, Myoung Keun Lee, Nam Yong Lee, Jong Won Kim, Chang Seok Ki
There has been increasing interest in standardized and quantitative Epstein-Barr virus (EBV) DNA testing for the management of EBV disease. We evaluated the performance of the Real-Q EBV Quantification Kit (BioSewoom, Korea) in whole blood (WB). Nucleic acid extraction and real-time PCR were performed by using the MagNA Pure 96 (Roche Diagnostics, Germany) and 7500 Fast real-time PCR system (Applied Biosystems, USA), respectively. Assay sensitivity, linearity, and conversion factor were determined by using the World Health Organization international standard diluted in EBV-negative WB...
March 2017: Annals of Laboratory Medicine
https://www.readbyqxmd.com/read/28024511/-clinico-pathologic-characteristics-of-adult-patients-with-atypical-infectious-mononucleosis
#8
Ya-Ping Yu, Ping Song, Zhi-Ming An, Xiao-Gang Zhou, Feng Li, Li-Ping Wang, Jian-Gang Mei, Yong-Ping Zhai
OBJECTIVE: To investigate the clinicopathologic characteristics of adult patients with atypical infectious mononucleosis(IM). METHODS: From January 2003 to December 2013, a total of 5 cases of atypical IM misdiagnosed as lymphoma were selected, and the clinico-pathological characteristics and efficacy of treatment were analyzed. Biopsy of lymph node or tonsil was performed to evaluate the possibility of lymphoma. Peripheral blood EBV antibody and EBV-DNA were examined by ELISA and real-time fluorescence quantitative PCR, respectively...
December 2016: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/28024491/-children-s-nk-t-cell-lymphoma-associated-hemophagocytic-syndrome-clinical-analysis-of-6-cases
#9
Yong-Zhi Zheng, Hao Zheng, Jian Li, Shao-Hua LE, Xue-Ling Hua, Zai-Sheng Chen, Ling Zheng, Mei Li, Yi-Qiao Chen, Qin-Li Gao, Jing-Hui Yang, Jian-Da Hu
OBJECTIVE: To study the clinical features, treatment and prognosis of patients with NK/T cell lymphoma-associated hemophagocytic syndrome(NK/T-LAHPS). METHODS: Retrospective analysis was used to explore the clinical data of 6 children with NK/T-LAHPS who were admitted in Department of Pediatric Hematology of Fujian Medical University Union Hospital from July 2012 to June 2016. The 6 patients included 4 boys and 2 girls, with a median age of 4 years(range 1.75 to 11)...
December 2016: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/28018767/a-rare-case-of-hemophagocytic-lymphohistiocytosis-associated-with-parvovirus-b19-infection
#10
Cai Yuan, Fnu Asad-Ur-Rahman, Khalid Abusaada
Hemophagocytic lymphohistiocytosis (HLH) is a rare but life-threatening syndrome resulting from excessive immune activation. Secondarily, HLH is often associated with autoimmune disease, infection, and malignancy. The most common infectious trigger is Epstein-Barr virus (EBV) infection. HLH is rarely triggered by parvovirus B19. We discuss a case of a 62-year-old male who presented with multi-organ failure with presumed septic shock who eventually was diagnosed with HLH, with positive parvovirus B19 deoxyribonucleic acid (DNA) polymerase chain reaction (PCR)...
November 24, 2016: Curēus
https://www.readbyqxmd.com/read/28008927/immunotherapy-against-cancer-related-viruses
#11
REVIEW
Haruko Tashiro, Malcolm K Brenner
Approximately 12% of all cancers worldwide are associated with viral infections. To date, eight viruses have been shown to contribute to the development of human cancers, including Epstein-Barr virus (EBV), Hepatitis B and C viruses, and Human papilloma virus, among others. These DNA and RNA viruses produce oncogenic effects through distinct mechanisms. First, viruses may induce sustained disorders of host cell growth and survival through the genes they express, or may induce DNA damage response in host cells, which in turn increases host genome instability...
January 2017: Cell Research
https://www.readbyqxmd.com/read/28004435/biopsy-proven-case-of-epstein-barr-virus-ebv-associated-vasculitis-of-the-central-nervous-system
#12
Kohei Kano 鹿野耕平, Takayuki Katayama, Shiori Takeguchi, Asuka Asanome, Kae Takahashi, Tsukasa Saito, Jun Sawada, Masato Saito, Ryogo Anei, Kyousuke Kamada, Naoyuki Miyokawa, Hiroshi Nishihara, Naoyuki Hasebe
A 75-year-old woman was admitted to our hospital with rapidly deteriorating consciousness disturbance. She had a 7-year history of rheumatoid arthritis (RA), which had been treated with methotrexate (MTX) and prednisolone. Brain T2-weighted MRI showed diffuse high-intensity lesions in the cerebral subcortical and deep white matter, bilateral basal ganglia and thalamus. A cerebrospinal fluid examination revealed elevated protein levels and positive Epstein-Barr virus (EBV) DNA. Human immunodeficiency virus was negative...
December 22, 2016: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/28003489/restricted-tet2-expression-in-germinal-center-type-b-cells-promotes-stringent-epstein-barr-virus-latency
#13
Coral K Wille, Yangguang Li, Lixin Rui, Eric C Johannsen, Shannon C Kenney
: EBV latently infects normal B cells, and contributes to the development of certain human lymphomas. Newly infected B cells support a highly transforming form (type III) of viral latency; however, long-term EBV infection in immunocompetent hosts is limited to B cells with a more restricted form of latency (type I) where most viral gene expression is silenced by promoter DNA methylation. How EBV converts latency type is unclear, although it is known that type I latency is associated with germinal center (GC) B cell phenotype, and type III latency with an activated B-cell (ABC) phenotype...
December 21, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27994225/comparison-of-circulating-tumour-cells-and-circulating-cell-free-epstein-barr-virus-dna-in-patients-with-nasopharyngeal-carcinoma-undergoing-radiotherapy
#14
Jess Honganh Vo, Wen Long Nei, Min Hu, Wai Min Phyo, Fuqiang Wang, Kam Weng Fong, Terence Tan, Yoke Lim Soong, Shie Lee Cheah, Kiattisa Sommat, Huiyu Low, Belinda Ling, Johnson Ng, Wan Loo Tan, Kian Sing Chan, Lynette Oon, Jackie Y Ying, Min-Han Tan
Quantification of Epstein-Barr virus (EBV) cell-free DNA (cfDNA) is commonly used in clinical settings as a circulating biomarker in nasopharyngeal carcinoma (NPC), but there has been no comparison with circulating tumour cells (CTCs). Our study aims to compare the performance of CTC enumeration against EBV cfDNA quantitation through digital PCR (dPCR) and quantitative PCR. 74 plasma samples from 46 NPC patients at baseline and one month after radiotherapy with or without concurrent chemotherapy were analysed...
December 2016: Scientific Reports
https://www.readbyqxmd.com/read/27993616/quantitative-multi-target-rna-profiling-in-epstein-barr-virus-infected-tumor-cells
#15
A E Greijer, O Ramayanti, S A W M Verkuijlen, Z Novalić, H Juwana, J M Middeldorp
Epstein-Barr virus (EBV) is etiologically linked to multiple acute, chronic and malignant diseases. Detection of EBV-RNA transcripts in tissues or biofluids besides EBV-DNA can help in diagnosing EBV related syndromes. Sensitive EBV transcription profiling yields new insights on its pathogenic role and may be useful for monitoring virus targeted therapy. Here we describe a multi-gene quantitative RT-PCR profiling method that simultaneously detects a broad spectrum (n=16) of crucial latent and lytic EBV transcripts...
December 16, 2016: Journal of Virological Methods
https://www.readbyqxmd.com/read/27989423/-diagnostic-and-therapeutic-contribution-of-microbiological-analysis-in-severe-microbial-keratitis-at-reims-university-hospital-between-2012%C3%A2-and-2014
#16
J Caliot, D Guindolet, A Ducasse, L Andreoletti, C Arndt
PURPOSE: To investigate the contribution of microbial analysis in the diagnosis and management of severe microbial keratitis. MATERIAL AND METHOD: This is a monocentric retrospective study at the University Hospital of Reims from January 2012 to December 2014. Corneal scrapings with infectious keratitis were subjected to routine bacterial and fungal culture. PCR was also performed to detect various viral DNA (VZV, CMV, EBV, HSV 1 & 2, adenovirus) and Acanthamoeba sp...
December 15, 2016: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/27987077/graves-orbitopathy-idiopathic-orbital-inflammatory-pseudotumor-and-epstein-barr-virus-infection-a-serological-and-molecular-study
#17
M Leo, F Maggi, G R Dottore, G Casini, P Mazzetti, M Pistello, S Sellari-Franceschini, M Nardi, P Vitti, C Marcocci, M Marinò
OBJECTIVE: One of the hypotheses on the pathogenesis of autoimmune diseases, including Graves' disease (GD) and Graves' orbitopathy (GO), involves bacterial or viral infections. Recently, Epstein-Barr virus (EBV) has been proposed to play a role in the pathogenesis of idiopathic orbital inflammatory pseudotumor (IOIP) in Asians. The aim of the present study was to investigate the possible association of GO with EBV infection/exposure, as compared with IOIP, using serum and tissue samples, as well as primary cultures of orbital fibroblasts...
December 16, 2016: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/27959790/epstein-barr-virus-nuclear-antigen-1-ebna1-interacts-with-regulator-of-chromosome-condensation-rcc1-dynamically-throughout-the-cell-cycle
#18
Thibaut Deschamps, Bazot Quentin, Derek M Leske, Ruth MacLeod, Dimitri Mompelat, Lionel Tafforeau, Vincent Lotteau, Vincent Maréchal, George S Baillie, Henri Gruffat, Joanna B Wilson, Evelyne Manet
The Epstein-Barr virus (EBV) nuclear antigen 1 (EBNA1) is a sequence-specific DNA binding protein which plays an essential role in viral episome replication and segregation, by recruiting the cellular complex of DNA replication onto the origin (oriP) and by tethering the viral DNA onto the mitotic chromosomes. Whereas the mechanisms of viral DNA replication are well documented, those involved in tethering EBNA1 to the cellular chromatin are far from being understood. Here, we have identified Regulator of Chromosome Condensation 1 (RCC1) as a novel cellular partner for EBNA1...
December 12, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27943278/frequency-and-clinical-correlates-of-elevated-plasma-epstein-barr-virus-dna-at-diagnosis-in-peripheral-t-cell-lymphomas-ptcl
#19
Bradley M Haverkos, Ying Huang, Alejandro Gru, Preeti Pancholi, Aharon G Freud, Anjali Mishra, Amy S Ruppert, Robert A Baiocchi, Pierluigi Porcu
Epstein Barr virus (EBV)-encoded RNAs (EBER) in tumor tissue and cell-free plasma EBV-DNA (pEBVd) are detected in EBV-associated lymphomas. Studies have suggested that EBER+ peripheral T-cell lymphomas (PTCL) have worse prognosis but the role of EBV in these neoplasms remains unclear. pEBVd is quantitative and more easily amenable to standardization than EBER, but frequency of pEBVd detection, clinical impact, and agreement with EBER status in PTCL are unknown. We retrospectively assessed frequency of detectable pre-treatment pEBVd, presence of EBER in tumor tissue, and outcomes in 61 of 135 EBV-assessable PTCL patients...
December 10, 2016: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/27939840/niclosamide-inhibits-lytic-replication-of-epstein-barr-virus-by-disrupting-mtor-activation
#20
Lu Huang, Mengtian Yang, Yan Yuan, Xiaojuan Li, Ersheng Kuang
Infection with the oncogenic γ-herpesviruses Epstein-Barr virus (EBV) and Kaposi's sarcoma-associated herpesvirus (KSHV) cause several severe malignancies in humans. Inhibition of the lytic replication of EBV and KSHV eliminates the reservoir of persistent infection and transmission, consequently preventing the occurrence of diseases from the sources of infection. Antiviral drugs are limited in controlling these viral infectious diseases. Here, we demonstrate that niclosamide, an old anthelmintic drug, inhibits mTOR activation during EBV lytic replication...
February 2017: Antiviral Research
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