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Latent membrane protein 1

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https://www.readbyqxmd.com/read/27900085/id1-upregulation-and-foxo3a-downregulation-by-epstein-barr-virus-encoded-lmp1-in-hodgkin-s-lymphoma
#1
Jun-Ichiro Ikeda, Naoki Wada, Satoshi Nojima, Shinichiro Tahara, Yoko Tsuruta, Kaori Oya, Eiichi Morii
Cancer-initiating cells (CICs) are specialized cells that have the ability to self-renew and are multipotent. We recently demonstrated that Forkhead box O3a (FoxO3a)-expressing cells exhibited a CIC-like potential in Hodgkin's lymphoma (HL). A proportion of HL patients are infected with Epstein-Barr virus (EBV). EBV-encoded latent membrane protein (LMP) 1 downregulates FoxO3a, suggesting that FoxO3a expression may be abolished in EBV-positive HL. Inhibitors of DNA-binding (ID) proteins are highly conserved transcription factors mediating stem cell functions...
November 2016: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/27873282/ebv-directed-t-cell-therapeutics-for-ebv-associated-lymphomas
#2
Lauren P McLaughlin, Stephen Gottschalk, Cliona M Rooney, Catherine M Bollard
Epstein Barr virus (EBV) is a human gamma herpes virus that establishes latency in B cells after primary infection. EBV generally only causes a mild, self-limiting viral illness but is also associated with several malignancies including posttransplantation lymphoproliferative disorder in the immunosuppressed host as well as Hodgkin and non-Hodgkin lymphoma in the immune competent host. The expression of EBV antigens by lymphoma has important applications as targets for adoptive T cell therapy. However, as many lymphomas only express subdominant EBV antigens that are less immunogenic, novel strategies are needed to manufacture EBV-specific T cell products specific for Latent Membrane Protein 1 (LMP1) and LMP2, which are expressed in lymphomas with type II and III latency...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27845040/a-human-fab-exclusively-binding-to-the-extracellular-domain-of-lmp2a
#3
Qing Cao, Dawei Zhang, Yuan Mao, Chanfang Meng, Jin Zhu, Zhenqing Feng, Renjie Chen
In the areas of North Africa, Southeast Asia as well as South China, Nasopharyngeal carcinoma (NPC) is among the most widespread cancers. Plenty of research findings confirmed that Epstein-Barr virus (EBV) played a crucial role in NPC. EBV-encoded Latent membrane protein 2A (LMP2A) which continuously expressed in cell membrane protein induced an epithelial-mesenchymal transition and increased the number of side population stem-like cancer cells in NPC. This reveals that LMP2A could contribute to the development and recurrence in NPC...
November 11, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27819673/lmp1-signaling-pathway-activates-irf4-in-latent-ebv-infection-and-a-positive-circuit-between-pi3k-and-src-is-required
#4
L Wang, J Ren, G Li, J P Moorman, Z Q Yao, S Ning
Interferon (IFN) regulatory factors (IRFs) have crucial roles in immune regulation and oncogenesis. We have recently shown that IRF4 is activated through c-Src-mediated tyrosine phosphorylation in virus-transformed cells. However, the intracellular signaling pathway triggering Src activation of IRF4 remains unknown. In this study, we provide evidence that Epstein-Barr virus (EBV) latent membrane protein 1 (LMP1) promotes IRF4 phosphorylation and markedly stimulates IRF4 transcriptional activity, and that Src mediates LMP1 activation of IRF4...
November 7, 2016: Oncogene
https://www.readbyqxmd.com/read/27794039/visualization-of-dna-g-quadruplexes-in-herpes-simplex-virus-1-infected-cells
#5
Sara Artusi, Rosalba Perrone, Sara Lago, Paolo Raffa, Enzo Di Iorio, Giorgio Palù, Sara N Richter
We have previously shown that clusters of guanine quadruplex (G4) structures can form in the human herpes simplex-1 (HSV-1) genome. Here we used immunofluorescence and immune-electron microscopy with a G4-specific monoclonal antibody to visualize G4 structures in HSV-1 infected cells. We found that G4 formation and localization within the cells was virus cycle dependent: viral G4s peaked at the time of viral DNA replication in the cell nucleus, moved to the nuclear membrane at the time of virus nuclear egress and were later found in HSV-1 immature virions released from the cell nucleus...
October 27, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27793268/spontaneous-metastases-in-immunocompetent-mice-harboring-a-primary-tumor-driven-by-oncogene-latent-membrane-protein-1-from-epstein-barr-virus
#6
Pu-Yuan Chang, Yenlin Huang, Tzu-Yuan Hung, Kowit-Yu Chong, Yu-Sun Chang, Chuck C-K Chao, Kai-Ping N Chow
BACKGROUND: In vitro and clinical studies suggest that the oncogene LMP1 (latent membrane protein 1) encoded by Epstein-Barr virus (EBV) plays a role in the development of nasopharyngeal carcinoma (NPC) and the formation of metastases in immunocompetent individuals. However, whether LMP1 itself is sufficient to drive these events in immunocompetent hosts remains elusive due to the lack of appropriate experimental models. The aim of this study was to study LMP1-dependent tumorigenesis and metastasis in BALB/c mice inoculated with BALB/c-3T3 cells expressing N-LMP1 (a Taiwanese NPC variant)...
August 2016: Biomedical Journal
https://www.readbyqxmd.com/read/27784366/-infection-status-and-prognosis-analysis-of-epstein-barr-virus-in-patients-with-newly-diagnosed-hodgkin-s-lymphoma
#7
Jun-Jie Yin, Bo Liang, Yi Lu, Xin-Rong Zhan
OBJECTIVE: To investigate the Epstein Barr virus(EBV) positive rate in newly diagnosed Hodgkin's lymphoma(HL) and the prognostic significance of EBV status. METHODS: A total of 120 previously untreated patients with histologically confirmed Hodgkin's lymphoma were enrolled in this study. The EBV infection status was confirmed through examining EBV-RNA(EBER) or EBV latent membrane protein-1, and these patients were divided into EBV positive group and EBV negative group...
October 2016: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/27750386/the-impact-of-ebv-and-hiv-infection-on-the-microenvironmental-niche-underlying-hodgkin-lymphoma-pathogenesis
#8
Antonino Carbone, Annunziata Gloghini, Arnaldo Caruso, Paolo De Paoli, Riccardo Dolcetti
The pathogenesis of classical Hodgkin lymphoma (cHL) is still enigmatic, largely because its tumor cells, the so-called Hodgkin and Reed-Stenberg (HRS) cells, invariably reside in a prominent reactive microenvironment, are rare and therefore difficult to analyze. On the other hand, the broadly investigated cHL-derived cell lines are not unequivocally considered as suitable and representative models for this puzzling disease. Based on current knowledge, it appears that the cross talk between the tumour cells and the reactive infiltrate of the microenvironment is complex and that multiple mechanisms occur, making cHL a very heterogeneous disease...
October 17, 2016: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/27737703/pd-l1-is-upregulated-by-ebv-driven-lmp1-through-nf-%C3%AE%C2%BAb-pathway-and-correlates-with-poor-prognosis-in-natural-killer-t-cell-lymphoma
#9
Xi-Wen Bi, Hua Wang, Wen-Wen Zhang, Jing-Hua Wang, Wen-Jian Liu, Zhong-Jun Xia, Hui-Qiang Huang, Wen-Qi Jiang, Yu-Jing Zhang, Liang Wang
BACKGROUND: Natural killer/T-cell lymphoma (NKTCL) is an Epstein-Barr virus (EBV)-associated, highly aggressive lymphoma. Treatment outcome remains sub-optimal, especially for advanced-stage or relapsed diseases. Programmed cell death receptor 1 (PD-1) and PD ligand 1 (PD-L1) have become promising therapeutic targets for various malignancies, but their role in the pathogenesis and their interactions with EBV in NKTCL remains to be investigated. METHODS: Expression of PD-L1 was measured in NK-92 (EBV-negative) and SNK-6 (EBV-positive) cells by western blot, quantitative real-time PCR and enzyme-linked immunosorbent assay, and flow cytometry, respectively...
October 13, 2016: Journal of Hematology & Oncology
https://www.readbyqxmd.com/read/27704636/expression-of-epstein-barr-virus-among-oral-potentially-malignant-disorders-and-oral-squamous-cell-carcinomas-in-the-south-indian-tobacco-chewing-population
#10
Sujatha S Reddy, Shivani Sharma, Vijaya Mysorekar
BACKGROUND: Oral cancer is the sixth most common malignancy in the world. Viruses are the causative agents of approximately 10%-15% of all cancers worldwide.(1) The tumorigenic roles of Epstein Barr Virus in oral cancer is unclear. Literature search results are conflicting and dependent on various factors like geographic/regional variations, socio-cultural lifestyles, dietary habits, chewing/ smoking tobacco habit etc. The present study is the first original observation about frequency of Epstein Barr Virus among South Indian tobacco chewing patients to elucidate its involvement in oral carcinogenesis and to know whether this can be a valuable diagnostic and prognostic indicator...
October 5, 2016: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/27682967/idiopathic-nephrotic-syndrome-the-ebv-hypothesis
#11
Claire Dossier, Agnès Jamin, Georges Deschênes
Steroid sensitive nephrotic syndrome is marked by a massive proteinuria and loss of podocytes foot processes. The mechanism of the disease remains debated but recent publications suggest a primary role of EBV. EBV replication in the peripheral blood is found in 50% of patients during the first flare of the disease. The genetic locus of steroid sensitive nephrotic syndrome was also identified as influencing antibodies directed against EBNA1. EBV is able to establish, latent benign infection in memory B cells that display phenotypes similar to antigen-selected memory B cells...
November 9, 2016: Pediatric Research
https://www.readbyqxmd.com/read/27681956/clinical-outcome-and-morbidity-in-pediatric-patients-with-nasopharyngeal-cancer-treated-with-chemoradiotherapy
#12
Puja Sahai, Bidhu Kalyan Mohanti, Atul Sharma, Alok Thakar, Suman Bhasker, Aanchal Kakkar, Mehar Chand Sharma, Ashish Datt Upadhyay
OBJECTIVES: The aim of the study was to evaluate the outcome and treatment-related morbidity in pediatric patients with nasopharyngeal carcinoma (NPC) treated with chemoradiotherapy. METHODS: We did a retrospective review of 41 pediatric patients diagnosed with NPC between 2000 and 2013. The majority of the patients were treated with neoadjuvant chemotherapy followed by concurrent chemoradiation with the dose of 70 Gy in 35 fractions. Eight patients were treated with intensity-modulated radiation therapy, while the remaining with three-dimensional conformal radiation therapy or two-dimensional simulation technique...
September 29, 2016: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/27668971/serum-b-cell-activating-factor-predicts-prognosis-in-nasal-type-extranodal-nk-t-cell-lymphoma
#13
Li Zhang, Na Li, Li Yang, Jing Zhang, Hua-Wei Weng, Li-Qun Zou
B-cell activating factor (BAFF) plays important roles in a variety of lymphoid malignancies. Compared with healthy adults, patients with non-Hodgkin lymphoma had higher level of serum BAFF, and it corresponded with disease severity, response for therapy and clinical outcome. Latent membrane protein 1 (LMP1) encoded by Epstein-Barr virus (EBV) which is a known agent of nasal, extranodal NK/T cell lymphoma (ENKTCL) can switch the BAFF activating promoter leading to higher expression of BAFF in EBV-related tumor cells...
December 2016: Cytokine
https://www.readbyqxmd.com/read/27650372/phage-display-screening-identifies-lmp1-binding-peptides-targeting-the-c-terminus-region-of-the-ebv-oncoprotein
#14
Nihel Ammous-Boukhris, Amor Mosbah, Emna Sahli, Wajdi Ayadi, Boutheina Hadhri-Guiga, Ameur Chérif, Ali Gargouri, Raja Mokdad-Gargouri
Latent membrane protein 1 (LMP1), a major oncoprotein of Epstein Barr Virus (EBV) is responsible for transforming B lymphocytes in vitro. LMP1 is overexpressed in several EBV-associated malignancies, and different approaches have been developed to reduce its level and accordingly its oncogenic function in tumor tissues. This study aimed to use phage display peptide library to obtain peptides which could specifically bind to the cytoplasmic region of LMP1 to prevent its interaction with signaling proteins. The LMP1 C-terminus region was produced in bacterial E...
September 17, 2016: Peptides
https://www.readbyqxmd.com/read/27632954/epstein-barr-virus-latent-membrane-protein-1-up-regulates-cytokines-and-correlates-with-older-age-and-poorer-prognosis-in-hodgkin-lymphoma
#15
Kung-Chao Chang, Paul C-H Chen, Yao Chang, Yu-Hsuan Wu, Ya-Ping Chen, Chien-Hsien Lai, L Jeffrey Medeiros, Ih-Jen Su, Hsei-Wei Wang
AIMS: Previously, we reported an association between Epstein-Barr virus (EBV)-positive Hodgkin lymphoma (HL), older age, and poorer prognosis. The aim of this study was to investigate the mechanisms underlying this association. METHODS AND RESULTS: Transfection of HL cell lines with EBV latent membrane protein-1 (LMP1) resulted in up-regulation of many cytokine genes as assessed by the use of oligonucleotide microarrays. The up-regulation of cytokines was validated by using an inflammatory cytokine protein array: macrophage inflammatory protein (MIP)-1α, MIP-1β, and interleukin (IL)-13...
September 16, 2016: Histopathology
https://www.readbyqxmd.com/read/27567526/positive-regulation-of-hif-1a-expression-by-ebv-oncoprotein-lmp1-in-nasopharyngeal-carcinoma-cells
#16
Wei-Wen Sung, Yi-Chih Chu, Peir-Rong Chen, Ming-Hui Liao, Jeng-Woei Lee
Latent membrane protein 1 (LMP1) is a pivotal viral oncoprotein that contributes to the carcinogenesis of Epstein-Barr virus (EBV)-associated malignancies, including nasopharyngeal carcinoma (NPC). We investigated the regulation of hypoxia-inducible factor 1-α (HIF-1α) by LMP1. In NPC cells, we found that LMP1 significantly enhanced the HIF-1α mRNA level, and not only the protein amount as described previously. Mechanistically, the stability of the HIF-1α transcript was remarkably prolonged by LMP1 via reduced expressions of RNA-destabilizing proteins tristetraprolin (TTP) and pumilio RNA-binding family member 2 (PUM2) through C-terminal activation region 1 (CTAR1) and CTAR3 interaction with the ERK1/2 and STAT3 signaling pathways, respectively, in parallel with hindrance of PUM2 binding to the HIF-1α mRNA 3'-untranslated region (3'-UTR)...
November 1, 2016: Cancer Letters
https://www.readbyqxmd.com/read/27525406/-viral-superantigens
#17
Dürdal Us
Superantigens (SAgs) are microbial proteins produced by various microorganisms that elicit excessive and strong stimulation of T cells via an unconventional mechanism. They cause polyclonal activation of T cells in a non-specific manner, by binding to a particular variable-beta (Vβ) chain of T-cell receptor (TCR) and MHC class II molecule, in unprocessed form and outside of peptide-binding cleft, forming a bridge between the antigen presenting cell and the T cell. SAgs are classified into three groups, namely 1) exogenous (soluble proteins and exotoxins secreted by microorganisms), 2) endogenous (transmembrane proteins encoded by viruses which are integrated into the genome) and 3) B-cell SAgs (proteins which stimulate predominantly B cells)...
July 2016: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/27512069/long-and-short-isoforms-of-the-human-cytomegalovirus-ul138-protein-silence-ie-transcription-and-promote-latency
#18
Song Hee Lee, Katie Caviness, Emily R Albright, Jeong-Hee Lee, Christopher B Gelbmann, Mike Rak, Felicia Goodrum, Robert F Kalejta
UNLABELLED: The UL133-138 locus present in clinical strains of human cytomegalovirus (HCMV) encodes proteins required for latency and reactivation in CD34(+) hematopoietic progenitor cells and virion maturation in endothelial cells. The encoded proteins form multiple homo- and hetero-interactions and localize within secretory membranes. One of these genes, UL136 gene, is expressed as at least five different protein isoforms with overlapping and unique functions. Here we show that another gene from this locus, the UL138 gene, also generates more than one protein isoform...
October 15, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27488004/a-clinicopathological-study-of-primary-central-nervous-system-lymphomas-their-association-with-epstein-barr-virus
#19
Mehar Chand Sharma, Rakesh Kumar Gupta, Seema Kaushal, Vaishali Suri, Chitra Sarkar, Manmohan Singh, S S Kale, Ranjit K Sahoo, Lalit Kumar, Vinod Raina
BACKGROUND & OBJECTIVES: Primary central nervous system lymphomas (PCNSLs) are relatively uncommon, accounting for 2-3 per cent of primary brain tumours. Majority of these are diffuse large B cell lymphomas (DLBCL) occurring both in immunocompromised and immunocompetent patients. We undertook this study to classify PCNSL into germinal centre (GC) and non-germinal centre (NGC) type based on Hans classification and to find the role of Epstein-Barr virus (EBV) in pathogenesis both by conventional immunohistochemistry (IHC) and chromogenic in situ hybridization (CISH)...
May 2016: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/27440880/epstein-barr-virus-oncoprotein-lmp1-mediates-epigenetic-changes-in-host-gene-expression-through-parp1
#20
Kayla A Martin, Lena N Lupey, Italo Tempera
UNLABELLED: The latent infection of Epstein-Barr virus (EBV) is associated with 1% of human cancer incidence. Poly(ADP-ribosyl)ation (PARylation) is a posttranslational modification catalyzed by poly(ADP-ribose) polymerases (PARPs) that mediate EBV replication during latency. In this study, we detail the mechanisms that drive cellular PARylation during latent EBV infection and the effects of PARylation on host gene expression and cellular function. EBV-infected B cells had higher PAR levels than EBV-negative B cells...
October 1, 2016: Journal of Virology
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