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Analysis of microRNA expression during Epstein-Barr virus encoded LMP1 and LMP2A transfected in TW03 cells

ABSTRACT: Epstein-Barr virus has been reported to regulate cellular microRNA expression in B cells. In the present study, we investigated the differential microRNAs modulated by Epstein-Barr virus in Naspharyngeal Carcinoma, using CapitalBio corporation's mammalian miRNA arrays.

ORGANISM(S): Mus musculus Rattus norvegicus Homo sapiens

PROVIDER: GSE26596 | GEO | 2011/01/13

SECONDARY ACCESSION(S): PRJNA136195

REPOSITORIES: GEO

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Analysis of microRNA expression during Epstein-Barr virus encoded LMP1 and LMP2A transfected in TW03 cells

Project description:Epstein-Barr virus has been reported to regulate cellular microRNA expression in B cells. In the present study, we investigated the differential microRNAs modulated by Epstein-Barr virus in Naspharyngeal Carcinoma, using CapitalBio corporation's mammalian miRNA arrays. Three cellular models were used in this study: the human naspharyngeal carcinoma cell line TW03 as a blank control; TW03 transfected with Epstein-Barr virus encoded LMP1; TW03 transfected with Epstein-Barr virus encoded LMP2A

2011-01-13 | E-GEOD-26596 | biostudies-arrayexpress

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Project description:RATIONALE: The Epstein Barr virus can cause cancer and lymphoproliferative disorders. Ganciclovir is an antiviral drug that acts against the Epstein Barr virus. Arginine butyrate may make virus cells more sensitive to ganciclovir. Combining ganciclovir and arginine butyrate may kill more Epstein Barr virus cells and tumor cells. PURPOSE: Phase I trial to study the effectiveness of arginine butyrate plus ganciclovir in treating patients who have cancer or lymphoproliferative disorders that are associated with the Epstein Barr virus.

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Epstein-Barr virus LMP1 and LMP2A transgenic B lymphocytes and lymphoma cells

Project description:Gene expression profile of splenic B cells (CD19+) from transgenic mice expressing the Epstein-Barr virus (EBV) latent membrane proteins (LMP) 1 and/or LMP2A. Freshly harvested primary B cells were profiled. B lymphocytes from transgenic LMP1, LMP2A, LMP1/2A mice and negative littermates were profiled from 6 month old adult mice; lymphoma cells were passaged in SCID mice and profiled for three LMP1 positive lymphomas and one negative lymphoma. 12 total samples. 4 transgenic B lymphocyte samples pooled from multiple biological replicates were hybridized to duplicate microarrays: LMP1 (pooled from 2 replicates), LMP2A (pooled from 3 replicates); LMP1/2A (pooled from 5 replicates), negative littermates (pooled from 4 replicates). 3 biological replicates of LMP1 lymphomas expressing high, medium and low levels of LMP1 and; 1 negative lymphoma was hybridized to 1 microarray chip. The reference sample consisted of 4 biological replicates of splenic B cells (CD19+) pooled from 4-7 month old non-transgenic Balb/c mice. The same reference was used for all hybridizations.

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Project description:The Epstein Barr virus circleRNAome

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A Mouse Model of Epstein-Barr virus LMP1 and LMP2A Driven Germinal Center B-cell Lymphoproliferative Disease

Project description:Epstein-Barr virus (EBV) is a major cause of immunosuppression-related lymphomas. EB-driven lymphoproliferative disease complicates up to 20% of transplants, and EBV is a major cause of human immunodeficieciency virus associated lymphomas. Despite successful antiretroviral therapy, the incidence of EBV-associated Hodgkin lymphoma continues to increase in HIV+ individuals. To gain insights into EBV membrane oncoprotein effects on B-cell growth, survival and pathogenesis in vivo, we generated transgenic mouse models, in which knock-in mice transgenically express control GFP or EBV latent membrane proteins (LMP) 1 and 2A under the control of the AICDA promoter. Upon T and NK-cell depletion by antibody cocktail, LMP1 and 2A co-expression drove explosive growth of plasmablastic lymphoma-like cells, which proliferated in the spleen, caused severe end-organ damage and death. RNAseq profiling identified genome-wide LMP1 and 2A effects on B-cell gene expression, including dramatic effects on chemokine and cytokine production. While cells exhibited plasmablast features, LMP1 and 2A co-expression also induced mixed hematopoietic lineage markers, a well described but incompletely understood feature of Hodgkin lymphoma. Collectively, our results identify synergistic effects of EBV membrane oncoprotein expression, and highlight their role in lymphoproliferative diseases of immunocompromised hosts.

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Project description:Epstein-Barr virus (EBV) infects human B cells and reprograms them to allow virus replication and persistence. One key viral factor in this process is latent membrane protein 2A (LMP2A), which has been described as a B cell receptor (BCR) mimic promoting malignant transformation. However, how LMP2A signaling contributes to tumorigenesis remains elusive. By systematically comparing LMP2A and BCR signaling using quantitative phosphoproteomics and transcriptome profiling, we identified molecular mechanisms through which LMP2A affects B cell biology. Consistent with previous literature, we found that LMP2A mimics a subset of BCR signaling events, including tyrosine-phosphorylation of the kinase SYK, the calcium initiation complex consisting of BLNK, BTK, PLC2, and its downstream transcription factor NFAT. However, the vast majority of LMP2A-induced signaling events markedly differed from those induced by BCR stimulation. These included differential phosphorylation of kinases, phosphatases, adaptor proteins, transcription factors such as NFB and TCF3, as well as widespread changes in the transcriptional output of LMP2A-expressing B cells. LMP2A affected apoptosis and cell cycle checkpoints by dysregulating the expression of apoptosis regulators such as Bcl-xL and the tumor suppressor retinoblastoma-associated protein (RB1). Accordingly, LMP2A cooperated with drivers of Burkitt lymphoma, overexpressed MYC and an oncogenic cyclin D3 mutant, by counteracting the pro-apoptotic effects of MYC and by further inhibiting RB1 function to promote cell growth. Our results indicate that LMP2A rewires rather than mimics BCR signaling, promoting a signaling output that predisposes EBV-infected B cells to hyperproliferation and eventual malignant transformation.

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