101
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Cao X, Huang Y, Xia D, Qiu Z, Shen X, Guo X, Zhao Q. BmNPV-miR-415 up-regulates the expression of TOR2 via Bmo-miR-5738. Saudi J Biol Sci 2017; 24:1614-1619. [PMID: 30294230 PMCID: PMC6169442 DOI: 10.1016/j.sjbs.2015.09.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Revised: 09/10/2015] [Accepted: 09/13/2015] [Indexed: 12/19/2022] Open
Abstract
MicroRNAs (miRNAs) have emerged as key players in host-pathogen interaction and many virus-encoded miRNAs have been identified (computationally and/or experimentally) in a variety of organisms. A novel Bombyx mori nucleopolyhedrosis virus (BmNPV)-encoded miRNA miR-415 was previously identified through high-throughput sequencing. In this study, a BmNPV-miR-415 expression vector was constructed and transfected into BmN cells. The differentially expressed protein target of rapamycin isoform 2 (TOR2) was observed through two-dimensional gel electrophoresis and mass spectrometry. Results showed that TOR2 is not directly a target gene of BmNPV-miR-415, but its expression is up-regulated by BmNPV-miR-415 via Bmo-miR-5738, which could be induced by BmNPV.
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Affiliation(s)
- Xueliang Cao
- Jiangsu University of Science and Technology, Zhenjiang City 212018, Jiangsu Province, PR China
- Dezhou College, Dezhou City 253023, Shandong Province, PR China
| | - Yong Huang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang City 471003, Henan Province, PR China
- The Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang City 212018, Jiangsu Province, PR China
| | - Dingguo Xia
- Jiangsu University of Science and Technology, Zhenjiang City 212018, Jiangsu Province, PR China
- The Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang City 212018, Jiangsu Province, PR China
| | - Zhiyong Qiu
- Jiangsu University of Science and Technology, Zhenjiang City 212018, Jiangsu Province, PR China
- The Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang City 212018, Jiangsu Province, PR China
| | - Xingjia Shen
- Jiangsu University of Science and Technology, Zhenjiang City 212018, Jiangsu Province, PR China
- The Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang City 212018, Jiangsu Province, PR China
| | - Xijie Guo
- Jiangsu University of Science and Technology, Zhenjiang City 212018, Jiangsu Province, PR China
- The Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang City 212018, Jiangsu Province, PR China
| | - Qiaoling Zhao
- Jiangsu University of Science and Technology, Zhenjiang City 212018, Jiangsu Province, PR China
- The Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang City 212018, Jiangsu Province, PR China
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102
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Lu J, Xu D, Jiang Y, Kong S, Shen Z, Xia S, Lu L. Integrated analysis of mRNA and viral miRNAs in the kidney of Carassius auratus gibelio response to cyprinid herpesvirus 2. Sci Rep 2017; 7:13787. [PMID: 29062054 PMCID: PMC5653811 DOI: 10.1038/s41598-017-14217-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 10/06/2017] [Indexed: 12/14/2022] Open
Abstract
MicroRNAs (miRNAs) are small, non-coding single stranded RNAs that play crucial roles in numerous biological processes. Vertebrate herpesviruses encode multiple viral miRNAs that modulate host and viral genes. However, the roles of viral miRNAs in lower vertebrates have not been fully determined. Here, we used high-throughput sequencing to analyse the miRNA and mRNA expression profiles of Carassius auratus gibelio in response to infection by cyprinid herpesvirus 2 (CyHV-2). RNA sequencing obtained 26,664 assembled transcripts, including 2,912 differentially expressed genes. Based on small RNA sequencing and secondary structure predictions, we identified 17 CyHV-2 encoded miRNAs, among which 14 were validated by stem-loop quantitative real-time reverse transcription polymerase chain reaction (qRT-PCR) and eight were validated by northern blotting. Furthermore, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis of miRNAs-mRNA pairs revealed diverse affected immune signalling pathways, including the RIG-I-like receptor and JAK-STAT pathways. Finally, we presented four genes involved in RIG-I-like pathways, including host gene IRF3, RBMX, PIN1, viral gene ORF4, which are negatively regulated by CyHV-2 encoded miRNA miR-C4. The present study is the first to provide a comprehensive overview of viral miRNA-mRNA co-regulation, which might have a key role in controlling post-transcriptomic regulation during CyHV-2 infection.
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Affiliation(s)
- Jianfei Lu
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, P. R. China
| | - Dan Xu
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, P. R. China
- Key Laboratory of Agriculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, P. R. China
- National Experimental Teaching Demonstration Center for Fishery Sciences, Shanghai Ocean University, Shanghai, P. R. China
| | - Yousheng Jiang
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, P. R. China
- Key Laboratory of Agriculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, P. R. China
- National Experimental Teaching Demonstration Center for Fishery Sciences, Shanghai Ocean University, Shanghai, P. R. China
| | - Shanyun Kong
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, P. R. China
| | - Zhaoyuan Shen
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, P. R. China
| | - Siyao Xia
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, P. R. China
| | - Liqun Lu
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, P. R. China.
- Key Laboratory of Agriculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, P. R. China.
- National Experimental Teaching Demonstration Center for Fishery Sciences, Shanghai Ocean University, Shanghai, P. R. China.
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103
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Zhang J, Huang T, Zhou Y, Cheng ASL, Yu J, To KF, Kang W. The oncogenic role of Epstein-Barr virus-encoded microRNAs in Epstein-Barr virus-associated gastric carcinoma. J Cell Mol Med 2017; 22:38-45. [PMID: 28990284 PMCID: PMC5742672 DOI: 10.1111/jcmm.13354] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 07/15/2017] [Indexed: 12/13/2022] Open
Abstract
Epstein–Barr virus (EBV) infection is detected in various epithelial malignancies, such as nasopharyngeal carcinoma (NPC) and gastric cancer (GC). EBV comprises some unique molecular features and encodes viral genes and microRNAs (miRNAs) by its own DNA sequence. EBV genes are required to maintain latency and contribute to oncogenic property. miRNAs encoded by EBV have been shown to contribute to initiation and progression of EBV‐related malignancies. By a number of genomic profiling studies, some EBV miRNAs were confirmed to be highly expressed in EBV‐associated gastric cancer (EBVaGC) samples and cell lines. The majority host targets of the EBV miRNAs are important for promoting cell growth and inhibiting apoptosis, facilitating cell survival and immune evasion. However, the integrated molecular mechanisms related to EBV miRNAs remain to be investigated. In this review, we summarized the crucial role of EBV miRNAs in epithelial malignancies, especially in EBVaGC. Collectively, EBV miRNAs play a significant role in the viral and host gene regulation network. Understanding the comprehensive potential targets and relevant functions of EBV miRNAs in gastric carcinogenesis might provide better clinical translation.
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Affiliation(s)
- Jinglin Zhang
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong SAR, China.,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong SAR, China.,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Tingting Huang
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong SAR, China.,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong SAR, China.,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Hong Kong SAR, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
| | - Yuhang Zhou
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong SAR, China.,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong SAR, China.,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Alfred S L Cheng
- Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong SAR, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.,School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, China
| | - Jun Yu
- Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong SAR, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.,Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, China
| | - Ka Fai To
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong SAR, China.,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong SAR, China.,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Hong Kong SAR, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
| | - Wei Kang
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong SAR, China.,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong SAR, China.,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Hong Kong SAR, China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
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104
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Gao W, Li ZH, Chen S, Chan JYW, Yin M, Zhang MJ, Wong TS. Epstein-Barr virus encoded microRNA BART7 regulates radiation sensitivity of nasopharyngeal carcinoma. Oncotarget 2017; 8:20297-20308. [PMID: 28423621 PMCID: PMC5386763 DOI: 10.18632/oncotarget.15526] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 01/10/2017] [Indexed: 12/18/2022] Open
Abstract
Epstein-Barr virus (EBV)-associated nasopharyngeal carcinoma (NPC) is very sensitive to radiotherapy. To date, the underlying mechanism remains poorly understood. Here, we demonstrated that expression of EBV-encoded microRNA BART7 (ebv-miR-BART7) increases responsiveness of NPC to radiation treatment by targeting GFPT1/TGFβ1 signaling. GFPT1 is the the key rate-limiting enzyme of the hexosamine signaling pathway and governs TGFβ1 production. TGFβ1, a pleotropic cytokine with the potency to trigger self-renewal and damage-repair machinery in somatic cells. TGFβ1 can protect zebrafish embryo from the lethal effects of radiation treatment. In silico analysis showed that ebv-miR-BART7 could target GFPT1 transcript. Correlation analysis on primary NPC tissues suggested that ebv-miR-BART7 and GFPT1 have negative expression correlation. Expression of GFPT1 and TGFβ1 were inducible by radiation in NPC cell with ebv-miR-BART7 expression. Further, suppressing endogenous GFPT1 expression inhibited TGFβ1 which subsequently increased the responsiveness of NPC to radiation treatment. Taken together, our results demonstrated that ebv-miR-BART7 controls TGFβ1 production by targeting GFPT1. Detection of ebv-miR-BART7 may provide useful indicator for monitoring NPC progression and predict therapeutic outcomes.
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Affiliation(s)
- Wei Gao
- Department of Surgery, The University of Hong Kong, Hong Kong SAR.,Shenzhen Institute of Research and Innovation, The University of Hong Kong, Guangdong Province, China
| | - Zeng-Hong Li
- Department of Otolaryngology, The First People's Hospital of Foshan, Guangdong Province, China
| | - Siqi Chen
- Department of Surgery, The University of Hong Kong, Hong Kong SAR.,Shenzhen Institute of Research and Innovation, The University of Hong Kong, Guangdong Province, China
| | - Jimmy Yu-Wai Chan
- Department of Surgery, The University of Hong Kong, Hong Kong SAR.,Shenzhen Institute of Research and Innovation, The University of Hong Kong, Guangdong Province, China
| | - Min Yin
- Department of Otorhinolaryngology Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Min-Juan Zhang
- Department of Surgery, The University of Hong Kong, Hong Kong SAR.,Shenzhen Institute of Research and Innovation, The University of Hong Kong, Guangdong Province, China
| | - Thian-Sze Wong
- Department of Surgery, The University of Hong Kong, Hong Kong SAR.,Shenzhen Institute of Research and Innovation, The University of Hong Kong, Guangdong Province, China
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105
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Nishikawa J, Iizasa H, Yoshiyama H, Nakamura M, Saito M, Sasaki S, Shimokuri K, Yanagihara M, Sakai K, Suehiro Y, Yamasaki T, Sakaida I. The Role of Epigenetic Regulation in Epstein-Barr Virus-Associated Gastric Cancer. Int J Mol Sci 2017; 18:ijms18081606. [PMID: 28757548 PMCID: PMC5577998 DOI: 10.3390/ijms18081606] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 07/19/2017] [Accepted: 07/22/2017] [Indexed: 02/07/2023] Open
Abstract
The Epstein–Barr virus (EBV) is detected in about 10% of gastric carcinoma cases throughout the world. In EBV-associated gastric carcinoma (EBVaGC), all tumor cells harbor the clonal EBV genome. The expression of latent EBV genes is strictly regulated through the methylation of EBV DNA. The methylation of viral DNA regulates the type of EBV latency, and methylation of the tumor suppressor genes is a key abnormality in EBVaGC. The methylation frequencies of several tumor suppressor genes and cell adhesion molecules are significantly higher in EBVaGC than in control cases. EBV-derived microRNAs repress translation from viral and host mRNAs. EBV regulates the expression of non-coding RNA in gastric carcinoma. With regard to the clinical application of demethylating agents against EBVaGC, we investigated the effects of decitabine against the EBVaGC cell lines. Decitabine inhibited the cell growth of EBVaGC cells. The promoter regions of p73 and Runt-related transcription factor 3(RUNX3) were demethylated, and their expression was upregulated by the treatment. We review the role of epigenetic regulation in the development and maintenance of EBVaGC and discuss the therapeutic application of DNA demethylating agents for EBVaGC.
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MESH Headings
- Antimetabolites, Antineoplastic/pharmacology
- Antimetabolites, Antineoplastic/therapeutic use
- Azacitidine/analogs & derivatives
- Azacitidine/pharmacology
- Azacitidine/therapeutic use
- Core Binding Factor Alpha 3 Subunit/genetics
- CpG Islands/drug effects
- DNA Methylation/drug effects
- DNA, Viral/genetics
- Decitabine
- Epigenesis, Genetic/drug effects
- Epstein-Barr Virus Infections/drug therapy
- Epstein-Barr Virus Infections/genetics
- Epstein-Barr Virus Infections/virology
- Gene Expression Regulation, Neoplastic/drug effects
- Gene Expression Regulation, Viral/drug effects
- Herpesvirus 4, Human/drug effects
- Herpesvirus 4, Human/genetics
- Herpesvirus 4, Human/pathogenicity
- Humans
- MicroRNAs/genetics
- RNA, Viral/genetics
- Stomach Neoplasms/drug therapy
- Stomach Neoplasms/genetics
- Stomach Neoplasms/virology
- Tumor Protein p73/genetics
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Affiliation(s)
- Jun Nishikawa
- Department of Laboratory Science, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
| | - Hisashi Iizasa
- Department of Microbiology, Shimane University Faculty of Medicine, 89-1 Enyacho, Izumo City, Shimane 693-8501, Japan.
| | - Hironori Yoshiyama
- Department of Microbiology, Shimane University Faculty of Medicine, 89-1 Enyacho, Izumo City, Shimane 693-8501, Japan.
| | - Munetaka Nakamura
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
| | - Mari Saito
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
| | - Sho Sasaki
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
| | - Kanami Shimokuri
- Department of Laboratory Science, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
| | - Masashi Yanagihara
- Department of Laboratory Science, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
| | - Kouhei Sakai
- Department of Oncology and Laboratory Medicine, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
| | - Yutaka Suehiro
- Department of Oncology and Laboratory Medicine, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
| | - Takahiro Yamasaki
- Department of Oncology and Laboratory Medicine, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
| | - Isao Sakaida
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
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106
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Characterization of the subcellular localization of Epstein-Barr virus encoded proteins in live cells. Oncotarget 2017; 8:70006-70034. [PMID: 29050259 PMCID: PMC5642534 DOI: 10.18632/oncotarget.19549] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 06/29/2017] [Indexed: 12/27/2022] Open
Abstract
Epstein-Barr virus (EBV) is the pathogenic factor of numerous human tumors, yet certain of its encoded proteins have not been studied. As a first step for functional identification, we presented the construction of a library of expression constructs for most of the EBV encoded proteins and an explicit subcellular localization map of 81 proteins encoded by EBV in mammalian cells. Viral open reading frames were fused with enhanced yellow fluorescent protein (EYFP) tag in eukaryotic expression plasmid then expressed in COS-7 live cells, and protein localizations were observed by fluorescence microscopy. As results, 34.57% (28 proteins) of all proteins showed pan-nuclear or subnuclear localization, 39.51% (32 proteins) exhibitted pan-cytoplasmic or subcytoplasmic localization, and 25.93% (21 proteins) were found in both the nucleus and cytoplasm. Interestingly, most envelope proteins presented pan-cytoplasmic or membranous localization, and most capsid proteins displayed enriched or complete localization in the nucleus, indicating that the subcellular localization of specific proteins are associated with their roles during viral replication. Taken together, the subcellular localization map of EBV proteins in live cells may lay the foundation for further illustrating the functions of EBV-encoded genes in human diseases especially in its relevant tumors.
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107
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Kim H, Iizasa H, Kanehiro Y, Fekadu S, Yoshiyama H. Herpesviral microRNAs in Cellular Metabolism and Immune Responses. Front Microbiol 2017; 8:1318. [PMID: 28769892 PMCID: PMC5513955 DOI: 10.3389/fmicb.2017.01318] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 06/29/2017] [Indexed: 12/15/2022] Open
Abstract
The microRNAs (miRNAs) function as a key regulator in many biological processes through post-transcriptional suppression of messenger RNAs. Recent advancements have revealed that miRNAs are involved in many biological functions of cells. Not only host cells, but also some viruses encode miRNAs in their genomes. Viral miRNAs regulate cell proliferation, differentiation, apoptosis, and the cell cycle to establish infection and produce viral progeny. Particularly, miRNAs encoded by herpes virus families play integral roles in persistent viral infection either by regulation of metabolic processes or the immune response of host cells. The life-long persistent infection of gamma herpes virus subfamilies, such as Epstein-Barr virus and Kaposi's sarcoma-associated herpesvirus, induces host cells to malignant transformation. The unbalanced metabolic processes and evasion from host immune surveillance by viral miRNAs are induced either by direct targeting of key proteins or indirect regulation of multiple signaling pathways. We provide an overview of the pathogenic roles of viral miRNAs in cellular metabolism and immune responses during herpesvirus infection.
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Affiliation(s)
- Hyoji Kim
- Department of Microbiology, Faculty of Medicine, Shimane UniversityShimane, Japan
| | - Hisashi Iizasa
- Department of Microbiology, Faculty of Medicine, Shimane UniversityShimane, Japan
| | - Yuichi Kanehiro
- Department of Microbiology, Faculty of Medicine, Shimane UniversityShimane, Japan
| | - Sintayehu Fekadu
- Department of Microbiology, Faculty of Medicine, Shimane UniversityShimane, Japan
| | - Hironori Yoshiyama
- Department of Microbiology, Faculty of Medicine, Shimane UniversityShimane, Japan
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108
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Zhao Z, Liu W, Liu J, Wang J, Luo B. The effect of EBV on WIF1, NLK, and APC gene methylation and expression in gastric carcinoma and nasopharyngeal cancer. J Med Virol 2017; 89:1844-1851. [PMID: 28543390 DOI: 10.1002/jmv.24863] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Accepted: 05/07/2017] [Indexed: 12/27/2022]
Abstract
Epstein-Barr virus (EBV) is an important DNA tumor virus that is associated with approximately 10% of gastric carcinomas and 99% of nasopharyngeal cancers (NPC). DNA methylation and microRNAs (miRNAs) are the most studied epigenetic mechanisms that can prompt disease susceptibility. This study aimed to detect the effect of EBV on Wnt inhibitory factor 1 (WIF1), Nemo-like kinase (NLK), and adenomatous polyposis coli (APC) gene methylation, and expression in gastric carcinoma and NPC. The WIF1, NLK, and APC gene mRNA expression levels were measured by real-time quantitative RT-PCR in four EBV-positive cell lines and four EBV-negative cell lines. Bisulfite genomic sequencing or methylation-specific PCR was used to detect the methylation status of the WIF1, NLK, and APC promoters. All cell lines were treated with 5-azacytidine (5-aza-dC), miR-BART19-3p mimics or an inhibitor, and analyzed by flow cytometry and MTT cell proliferation assays. The WIF1, NLK, and APC promoters were hypermethylated in all eight cell lines. 5-Aza-dC displayed a growth inhibitory effect on cells . After transfection with miR-BART19-3p mimics, the expression of WIF1, and APC decreased, and the cellular proliferation rate increased. After transfection with the miR-BART19-3p inhibitor, the expression levels were higher, and the cell growth was inhibited. In the NPC and GC cell lines, the promoters of WIF1, NLK, and APC are highly methylated, and the expression of these three genes is regulated by miR-BART19-3p. The activity of the Wnt pathway in EBV-associated tumors may be enhanced by miR-BART19-3p.
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Affiliation(s)
- Zhenzhen Zhao
- Department of Medical Microbiology, Qingdao University Medical College, Qingdao, China
| | - Wen Liu
- Department of Medical Microbiology, Qingdao University Medical College, Qingdao, China
| | - Jincheng Liu
- Department of Medical Microbiology, Qingdao University Medical College, Qingdao, China
| | - Jiayi Wang
- Department of Medical Microbiology, Qingdao University Medical College, Qingdao, China
| | - Bing Luo
- Department of Medical Microbiology, Qingdao University Medical College, Qingdao, China
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109
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Bergallo M, Gambarino S, Pinon M, Barat V, Montanari P, Daprà V, Galliano I, Calvo PL. EBV-encoded microRNAs profile evaluation in pediatric liver transplant recipients. J Clin Virol 2017; 91:36-41. [DOI: 10.1016/j.jcv.2017.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 03/21/2017] [Accepted: 04/02/2017] [Indexed: 01/08/2023]
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110
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Assadian F, Kamel W, Laurell G, Svensson C, Punga T, Akusjärvi G. Expression profile of Epstein-Barr virus and human adenovirus small RNAs in tonsillar B and T lymphocytes. PLoS One 2017; 12:e0177275. [PMID: 28542273 PMCID: PMC5444648 DOI: 10.1371/journal.pone.0177275] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 04/25/2017] [Indexed: 12/24/2022] Open
Abstract
We have used high-throughput small RNA sequencing to characterize viral small RNA expression in purified tonsillar B and T lymphocytes isolated from patients tested positive for Epstein-Barr virus (EBV) or human adenovirus (HAdV) infections, respectively. In the small set of patients analyzed, the expression profile of EBV and HAdV miRNAs could not distinguish between patients diagnosed with tonsillar hypertrophy or chronic/recurrent tonsillitis. The EBV miR-BART expression profile among the patients diagnosed with tonsillar diseases resembles most closely the pattern seen in EBV+ tumors (Latency II/I). The miR-BARTs that appear to be absent in normal EBV infected cells are essentially all detectable in the diseased tonsillar B lymphocytes. In the EBV+ B cells we detected 44 EBV miR-BARTs derived from the proposed BART precursor hairpins whereof five are not annotated in miRBase v21. One previously undetected miRNA, BART16b-5p, originates from the miR-BART16 precursor hairpin as an alternative 5´ miR-BART16 located precisely upstream of the annotated miR-BART16-5p. Further, our analysis revealed an extensive sequence variation among the EBV miRNAs with isomiRs having a constant 5´ end but alternative 3´ ends. A range of small RNAs was also detected from the terminal stem of the EBER RNAs and the 3´ part of v-snoRNA1. During a lytic HAdV infection in established cell lines the terminal stem of the viral non-coding VA RNAs are processed to highly abundant viral miRNAs (mivaRNAs). In contrast, mivaRNA expression in HAdV positive tonsillar T lymphocytes was very low. The small RNA profile further showed that the 5´ mivaRNA from VA RNAI and the 3´ mivaRNA from VA RNAII were as predicted, whereas the 3´ mivaRNA from VA RNAI showed an aberrant processing upstream of the expected Dicer cleavage site.
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Affiliation(s)
- Farzaneh Assadian
- Department of Medical Biochemistry and Microbiology, Uppsala Biomedical Center, Uppsala University, Uppsala, Sweden
| | - Wael Kamel
- Department of Medical Biochemistry and Microbiology, Uppsala Biomedical Center, Uppsala University, Uppsala, Sweden
| | - Göran Laurell
- Department of Surgical Sciences, Otorhinolaryngology and Head and Neck Surgery, Uppsala University, Uppsala, Sweden
| | - Catharina Svensson
- Department of Medical Biochemistry and Microbiology, Uppsala Biomedical Center, Uppsala University, Uppsala, Sweden
| | - Tanel Punga
- Department of Medical Biochemistry and Microbiology, Uppsala Biomedical Center, Uppsala University, Uppsala, Sweden
| | - Göran Akusjärvi
- Department of Medical Biochemistry and Microbiology, Uppsala Biomedical Center, Uppsala University, Uppsala, Sweden
- * E-mail:
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111
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Li J, Callegari S, Masucci MG. The Epstein-Barr virus miR-BHRF1-1 targets RNF4 during productive infection to promote the accumulation of SUMO conjugates and the release of infectious virus. PLoS Pathog 2017; 13:e1006338. [PMID: 28414785 PMCID: PMC5413087 DOI: 10.1371/journal.ppat.1006338] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 05/02/2017] [Accepted: 04/06/2017] [Indexed: 12/21/2022] Open
Abstract
Post-translational modification by the Small Ubiquitin-like Modifier (SUMO) regulates a variety of cellular functions, and is hijacked by viruses to remodel the host cell during latent and productive infection. Here we have monitored the activity of the SUMO conjugation machinery in cells productively infected with Epstein-Barr virus (EBV). We found that SUMO2/3 conjugates accumulate during the late phase of the productive virus cycle, and identified several viral proteins as bone fide SUMOylation substrates. Analysis of the mechanism involved in the accumulation of SUMOylated proteins revealed upregulation of several components of the SUMO-conjugation machinery and post-transcriptional downregulation of the SUMO-targeted ubiquitin ligase RNF4. The latter effect was mediated by selective inhibition of RNF4 protein expression by the viral miR-BHRF1-1. Reconstitution of RNF4 in cells expressing an inducible miR-BHRF1-1 sponge or a miR-BHRF1-1 resistant RNF4 was associated with reduced levels of early and late viral proteins and impaired virus release. These findings illustrate a novel strategy for viral interference with the SUMO pathway, and identify the EBV miR-BHRF1-1 and the cellular RNF4 as regulators of the productive virus cycle. We have investigated the activity of the SUMOylation machinery in cells infected with Epstein-Barr virus (EBV), a human herpesvirus that infects B-lymphocytes and is associated with malignancies. We found that activation of the productive virus cycle is accompanied by accumulation of SUMO conjugates, upregulation of components of the SUMO conjugation machinery, and downregulation of the SUMO-targeted ubiquitin ligase RNF4. The decrease of RNF4 is due to post-transcriptional downregulation by miR-BHRF1-1, a member of the BHRF1 microRNA cluster that is upregulated during productive infection. The effect of miR-BHRF1-1 was confirmed in luciferase reported assays, by mutation of the RNF4 3’UTR seed site, by transfection of a synthetic miR-BHRF1-1 mimic, by ectopic expression of miR-BHRF1-1 and by the reversal of RNF4 downregulation in cells expressing a miR-BHRF1-1 sponge. We also found that several early and late viral proteins are bona fide SUMOylation substrates. Reconstitution of RNF4 in productively infected cells was accompanied by proteasome-dependent degradation of the SUMOylated viral protein and by a significantly reduced virus yield. These findings illustrate a new strategy for viral interference with the SUMO pathway, an unexpected contribution of miR-BHRF1-1 to the productive cycle of EBV and a previously unrecognized role of the RNF4 ligase in the regulation of virus production.
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Affiliation(s)
- Jinlin Li
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Simone Callegari
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Maria G. Masucci
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
- * E-mail:
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112
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Identification and characterization of two putative microRNAs encoded by Bombyx mori cypovirus. Virus Res 2017; 233:86-94. [DOI: 10.1016/j.virusres.2017.03.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Revised: 03/03/2017] [Accepted: 03/04/2017] [Indexed: 01/23/2023]
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113
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Wang YF, He DD, Liang HW, Yang D, Yue H, Zhang XM, Wang R, Li B, Yang HX, Liu Y, Chen Y, Duan YX, Zhang CY, Chen X, Fu J. The identification of up-regulated ebv-miR-BHRF1-2-5p targeting MALT1 and ebv-miR-BHRF1-3 in the circulation of patients with multiple sclerosis. Clin Exp Immunol 2017; 189:120-126. [PMID: 28253538 DOI: 10.1111/cei.12954] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/23/2017] [Indexed: 12/12/2022] Open
Abstract
Epstein-Barr virus (EBV) is a well-documented aetiological factor for multiple sclerosis (MS). EBV encodes at least 44 microRNAs (miRNAs) that are readily detectable in the circulation of human. Previous studies have demonstrated that EBV-encoded miRNAs regulate host immune response and may serve as biomarkers for EBV-associated diseases. However, the roles of EBV miRNAs in MS are still unknown. To fill the gap, we conducted a comprehensive profiling of 44 mature EBV miRNAs in 30 relapsing-remitting MS (RRMS) patients at relapse and 30 matched healthy controls. Expression levels of ebv-miR-BHRF1-2-5p and ebv-miR-BHRF1-3 were elevated significantly in the circulation and correlated positively with the expanded disability status scale (EDSS) scores of MS patients. Receiver operating characteristic (ROC) analyses confirmed that the expression of these two miRNAs distinguished MS patients clearly from healthy controls. Luciferase assays revealed that ebv-miR-BHRF1-2-5p may directly target MALT1 (mucosa-associated lymphoid tissue lymphoma transport protein 1), a key regulator of immune homeostasis. In conclusion, we described the expression of EBV miRNAs in MS and preliminarily validated the potential target genes of significantly altered EBV miRNAs. The findings may pave the way for prospective study about the pathogenesis of MS.
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Affiliation(s)
- Y F Wang
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - D D He
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - H W Liang
- Jiangsu Engineering Research Center for microRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China
| | - D Yang
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - H Yue
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - X M Zhang
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - R Wang
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - B Li
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - H X Yang
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - Y Liu
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - Y Chen
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - Y X Duan
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
| | - C Y Zhang
- Jiangsu Engineering Research Center for microRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China
| | - X Chen
- Jiangsu Engineering Research Center for microRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China
| | - J Fu
- Department of Neurology, the Second Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin, China
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114
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Yang YC, Liem A, Lambert PF, Sugden B. Dissecting the regulation of EBV's BART miRNAs in carcinomas. Virology 2017; 505:148-154. [PMID: 28259048 PMCID: PMC5504693 DOI: 10.1016/j.virol.2017.02.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 01/31/2017] [Accepted: 02/14/2017] [Indexed: 12/11/2022]
Abstract
Epstein-Barr virus (EBV) encodes multiple miRNAs known to contribute to
its pathogenicity. Previous studies have found that the levels of some EBV
miRNAs are 10–100 fold higher in biopsies and in tumor xenografts than
in cells grown in culture. We have asked if these increased levels reflect
transcriptional enhancement resulting from the tumor microenvironment, selection
for increased levels of the EBV genome, or both. We measured the levels of BART
miRNAs and their DNA templates in tumor xenografts induced from EBV-positive
gastric carcinoma cells and EBV-negative gastric carcinoma cells expressing
plasmid replicons encoding these miRNAs. We focused on BART miRNAs which are
expressed in all tumors and found that they provide tumors selective growth
advantages as xenografts. Stem-loop PCR and real-time PCR revealed that the
xenografts expressed both higher levels of some miRNAs and viral DNA templates
than did the corresponding cells in culture.
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Affiliation(s)
- Ya-Chun Yang
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, WI 53705-2275, United States
| | - Amy Liem
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, WI 53705-2275, United States
| | - Paul F Lambert
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, WI 53705-2275, United States
| | - Bill Sugden
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, WI 53705-2275, United States.
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115
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Kang BW, Choi Y, Kwon OK, Lee SS, Chung HY, Yu W, Bae HI, Seo AN, Kang H, Lee SK, Jeon SW, Hur K, Kim JG. High level of viral microRNA-BART20-5p expression is associated with worse survival of patients with Epstein-Barr virus-associated gastric cancer. Oncotarget 2017; 8:14988-14994. [PMID: 28122341 PMCID: PMC5362460 DOI: 10.18632/oncotarget.14744] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 01/10/2017] [Indexed: 11/25/2022] Open
Abstract
This study analyzed the relationship between several Epstein-Barr virus (EBV) microRNA (miRNA) expression profiles and the clinicopathologic features of patients with EBV-associated gastric cancer. The miRNA expression was examined in 59 tumor and 39 paired normal mucosal tissues from available formalin-fixed paraffin embedded tissue samples. The expression levels of miR-BamHI fragment A rightward transcript (BART)1-5p, miR-BART4-5p, and miR-BART20-5p were determined using a quantitative real-time polymerase chain reaction. The expression of all three analyzed EBV microRNAs was significantly higher in the tumor tissue than in the paired normal tissue (P < 0.001 for each). When the median value of the EBV microRNA expression levels was used as the cutoff point, a high BART20-5p expression was associated with worse recurrence-free survival (P = 0.034) in a multivariate analysis including age and pathologic stage. In conclusion, the expression level of BART20-5p may predict recurrence-free survival for patients with EBV-associated gastric cancer. Further studies are warranted to clarify the roles of EBV BART microRNAs in the carcinogenesis, and their potential as a biomarker and therapeutic target for EBV-associated gastric cancer.
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Affiliation(s)
- Byung Woog Kang
- Department of Oncology/Hematology, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Kyungpook National University Cancer Research Institute, Kyungpook National University, Daegu, South Korea
| | - YongHun Choi
- Department of Biochemistry and Cell Biology, Cell and Matrix Research Institute, School of Medicine, Kyungpook National University, Daegu, South Korea
- BK21 Plus KNU Biomedical Convergence Program, Department of Biomedical Science, Kyungpook National University, Daegu, South Korea
| | - Oh Kyoung Kwon
- Department of Surgery, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, South Korea
| | - Seung Soo Lee
- Department of Surgery, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, South Korea
| | - Ho Young Chung
- Department of Surgery, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, South Korea
| | - Wansik Yu
- Department of Surgery, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, South Korea
| | - Han Ik Bae
- Department of Pathology, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, South Korea
| | - An Na Seo
- Department of Pathology, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, South Korea
| | - Hyojeung Kang
- College of Pharmacy, Institute of Microorganisms and Research Institute of Pharmaceutical Sciences, Kyunpook National University, Daegu, South Korea
| | - Suk Kyeong Lee
- Department of Medical Lifescience, College of Medicine, Catholic University of Korea, Seoul, South Korea
| | - Seong Woo Jeon
- Department of Gastroeneterology, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, South Korea
| | - Keun Hur
- Department of Biochemistry and Cell Biology, Cell and Matrix Research Institute, School of Medicine, Kyungpook National University, Daegu, South Korea
- BK21 Plus KNU Biomedical Convergence Program, Department of Biomedical Science, Kyungpook National University, Daegu, South Korea
| | - Jong Gwang Kim
- Department of Oncology/Hematology, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Kyungpook National University Cancer Research Institute, Kyungpook National University, Daegu, South Korea
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116
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Sakamoto K, Sekizuka T, Uehara T, Hishima T, Mine S, Fukumoto H, Sato Y, Hasegawa H, Kuroda M, Katano H. Next-generation sequencing of miRNAs in clinical samples of Epstein-Barr virus-associated B-cell lymphomas. Cancer Med 2017; 6:605-618. [PMID: 28181423 PMCID: PMC5345668 DOI: 10.1002/cam4.1006] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Revised: 11/17/2016] [Accepted: 12/13/2016] [Indexed: 12/16/2022] Open
Abstract
Epstein-Barr virus (EBV) encodes 49 microRNAs (miRNAs) in the BART and BHRF1 regions of its genome. Although expression profiles of EBV-encoded miRNAs have been reported for EBV-positive cell lines and nasopharyngeal carcinoma, to date there is little information about total miRNA expression, including cellular and viral miRNAs, in the primary tumors of EBV-associated B-lymphoproliferative disorders. In this study, next-generation sequencing and quantitative real-time reverse transcription-PCR were used to determine the expression profiles of miRNAs in EBV-infected cell lines and EBV-associated B-cell lymphomas, including AIDS-related diffuse large B-cell lymphoma (DLBCL), pyothorax-associated lymphoma, methotrexate-associated lymphoproliferative disorder, EBV-positive DLBCL of the elderly, and Hodgkin lymphoma. Next-generation sequencing revealed that EBV-encoded miRNAs accounted for up to 34% of total annotated miRNAs in these cases. Expression of three miR-BHRF1s was significantly higher in AIDS-related DLBCL and pyothorax-associated lymphoma compared with methotrexate-associated lymphoproliferative disorder and EBV-positive DLBCL of the elderly, suggesting the association of miR-BHRF1s expression with latency III EBV infection. Heat map/clustering analysis of expression of all miRNAs, including cellular and EBV miRNAs, by next-generation sequencing demonstrated that each EBV tumor, except methotrexate-associated lymphoproliferative disorder, formed an isolated cluster. Principal component analysis based on the EBV-encoded miRNA expression showed that each EBV tumor formed a distinguished cluster, but AIDS-related DLBCL and pyothorax-associated lymphoma formed larger clusters than other tumors. These data suggest that expression of miRNAs, including EBV-encoded miRNAs, is associated with the tumor type and status of virus infection in these tumors.
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Affiliation(s)
- Kouta Sakamoto
- Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Tsuyoshi Sekizuka
- Pathogen Genomics Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Taeko Uehara
- Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Tsunekazu Hishima
- Department of Pathology, Tokyo Metropolitan Komagome Hospital, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo, 113-8613, Japan
| | - Sohtaro Mine
- Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Hitomi Fukumoto
- Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Yuko Sato
- Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Hideki Hasegawa
- Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Makoto Kuroda
- Pathogen Genomics Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Harutaka Katano
- Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
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117
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Zhang YM, Yu Y, Zhao HP. EBV‑BART‑6‑3p and cellular microRNA‑197 compromise the immune defense of host cells in EBV‑positive Burkitt lymphoma. Mol Med Rep 2017; 15:1877-1883. [PMID: 28259992 DOI: 10.3892/mmr.2017.6173] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 09/30/2016] [Indexed: 11/06/2022] Open
Abstract
The present study aimed to identify the association between Epstein‑Barr virus (EBV) microRNA (miRNA) and cellular miRNA in compromising the immune system, which contributes to the development of Burkitt lymphoma (BL). The present study selected cellular miR‑197 as the focus of the experiments due to the previous report that it is differentially expressed and the observation that interleukin‑6 receptor (IL‑6R) is a virtual target of miR‑197 and EBV‑BamHI A region rightward transcript (BART)‑6‑3p. In the present study, IL‑6R was confirmed as a target of cellular miR‑197 using a luciferase assay, and the negative regulatory association between miRNA (miR‑197 and EBV‑BART‑6‑3p) and mRNA (IL‑6R) was confirmed by the observation that IL‑6R was downregulated in EBV‑positive Burkitt lymphoma and that miR‑197 was upregulated. Additionally, mimics of EBV‑BART‑6‑3p and miR‑197 were introduced into lymphoma cells, and it was found that EBV‑BART‑6‑3p and miR‑197 synergistically reduced the expression of IL‑6R. These findings improved current understanding of the role of miR‑197/ EBV‑BART‑6‑3p and their target, IL‑6R, in the development of EBV‑positive BL, and they may offer potential as novel therapeutic targets for the treatment of EBV‑positive malignancies.
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Affiliation(s)
- Yang-Min Zhang
- Department of Blood Transfusion, Xi'an Central Hospital, Xi'an, Shaanxi 710003, P.R. China
| | - Yan Yu
- Clinical Laboratory of Hong‑Hui Hospital, Xi'an Jiaotong University College of Medicine, Xi'an, Shaanxi 710054, P.R. China
| | - He-Ping Zhao
- Clinical Laboratory of Hong‑Hui Hospital, Xi'an Jiaotong University College of Medicine, Xi'an, Shaanxi 710054, P.R. China
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118
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Sorel O, Dewals BG. MicroRNAs in large herpesvirus DNA genomes: recent advances. Biomol Concepts 2017; 7:229-39. [PMID: 27544723 DOI: 10.1515/bmc-2016-0017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 07/18/2016] [Indexed: 12/26/2022] Open
Abstract
MicroRNAs (miRNAs) are small non-coding RNAs (ncRNAs) that regulate gene expression. They alter mRNA translation through base-pair complementarity, leading to regulation of genes during both physiological and pathological processes. Viruses have evolved mechanisms to take advantage of the host cells to multiply and/or persist over the lifetime of the host. Herpesviridae are a large family of double-stranded DNA viruses that are associated with a number of important diseases, including lymphoproliferative diseases. Herpesviruses establish lifelong latent infections through modulation of the interface between the virus and its host. A number of reports have identified miRNAs in a very large number of human and animal herpesviruses suggesting that these short non-coding transcripts could play essential roles in herpesvirus biology. This review will specifically focus on the recent advances on the functions of herpesvirus miRNAs in infection and pathogenesis.
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119
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Abstract
MicroRNAs are small, noncoding RNAs that posttranscriptionally regulate gene expression. The discovery of this relatively new mode of gene regulation as well as studies showing the prognostic value of viral and cellular miRNAs as biomarkers, such as in cancer progression, has stimulated the development of many methods to characterize miRNAs. EBV encodes 25 viral precursor microRNAs within its genome that are expressed during lytic and latent infection. In addition to viral miRNAs, EBV infection induces the expression of specific cellular oncogenic miRNAs, such as miR-155, miR-146a, miR-21, and others, that can contribute to the persistence of latently infected cells. This chapter describes several current techniques used to identify and detect the expression of viral and cellular miRNAs in EBV-infected cells.
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Affiliation(s)
- Rebecca L Skalsky
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, 505 NW 185th Avenue, Beaverton, OR, USA.
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120
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Huang T, Ji Y, Hu D, Chen B, Zhang H, Li C, Chen G, Luo X, Zheng XW, Lin X. SNHG8 is identified as a key regulator of epstein-barr virus(EBV)-associated gastric cancer by an integrative analysis of lncRNA and mRNA expression. Oncotarget 2016; 7:80990-81002. [PMID: 27835598 PMCID: PMC5348371 DOI: 10.18632/oncotarget.13167] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Accepted: 10/31/2016] [Indexed: 12/26/2022] Open
Abstract
The Epstein-Barr virus (EBV) is associated with a variety of cancers, including gastric cancer, which has one of the highest mortality rates of all human cancers. Long non-coding RNAs (lncRNAs) have been suggested to have important causal roles in gastric cancer. However, the interaction between lncRNAs and EBV has not yet been studied. To this end, we sequenced 11,311 lncRNAs and 144,826 protein-coding transcripts from four types of tissue: one non-EBV-infected gastric carcinoma (EBVnGC) and its adjacent normal tissue, and one EBV-associated gastric carcinoma (EBVaGC) and its adjacent normal tissue. Five lncRNAs showed EBVaGC-specific expression; of those, one (SNHG8) was validated using real-time PCR in an independent cohort with 88 paired gastric cancer and adjacent tissue samples. To explore the functions of SNHG8, we identified its mRNA targets on the lncRNA-mRNA co-expression network of the Illumina Body Map, which contains the RNA sequencing data of mRNAs and lncRNAs from 16 normal human tissues. SNHG8 lncRNA was found to affect several gastric cancer-specific pathways and target genes of EBV. Our results reveal the intertwined tumorigenesis mechanisms of lncRNA and EBV and identify SNHG8 as a highly possible candidate biomarker and drug target of gastric cancer.
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Affiliation(s)
- Tao Huang
- Department of Pathology, Fujian Provincial Cancer Hospital and Fujian Medical University Cancer Hospital, Fuzhou, Fujian, China
- Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences and Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yan Ji
- Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences and Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Dan Hu
- Department of Pathology, Fujian Provincial Cancer Hospital and Fujian Medical University Cancer Hospital, Fuzhou, Fujian, China
| | - Baozheng Chen
- Department of Pathology, Fujian Provincial Cancer Hospital and Fujian Medical University Cancer Hospital, Fuzhou, Fujian, China
| | - Hejun Zhang
- Department of Pathology, Fujian Provincial Cancer Hospital and Fujian Medical University Cancer Hospital, Fuzhou, Fujian, China
| | - Chao Li
- Department of Pathology, Fujian Provincial Cancer Hospital and Fujian Medical University Cancer Hospital, Fuzhou, Fujian, China
| | - Gang Chen
- Department of Pathology, Fujian Provincial Cancer Hospital and Fujian Medical University Cancer Hospital, Fuzhou, Fujian, China
| | - Xingguang Luo
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Xiong-wei Zheng
- Department of Pathology, Fujian Provincial Cancer Hospital and Fujian Medical University Cancer Hospital, Fuzhou, Fujian, China
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, Fujian, China
| | - Xiandong Lin
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, Fujian, China
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121
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Piccaluga PP, Navari M, De Falco G, Ambrosio MR, Lazzi S, Fuligni F, Bellan C, Rossi M, Sapienza MR, Laginestra MA, Etebari M, Rogena EA, Tumwine L, Tripodo C, Gibellini D, Consiglio J, Croce CM, Pileri SA, Leoncini L. Virus-encoded microRNA contributes to the molecular profile of EBV-positive Burkitt lymphomas. Oncotarget 2016; 7:224-40. [PMID: 26325594 PMCID: PMC4807994 DOI: 10.18632/oncotarget.4399] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 07/20/2015] [Indexed: 01/28/2023] Open
Abstract
Burkitt lymphoma (BL) is an aggressive neoplasm characterized by consistent morphology and phenotype, typical clinical behavior and distinctive molecular profile. The latter is mostly driven by the MYC over-expression associated with the characteristic translocation (8;14) (q24; q32) or with variant lesions. Additional genetic events can contribute to Burkitt Lymphoma pathobiology and retain clinical significance. A pathogenetic role for Epstein-Barr virus infection in Burkitt lymphomagenesis has been suggested; however, the exact function of the virus is largely unknown. In this study, we investigated the molecular profiles (genes and microRNAs) of Epstein-Barr virus-positive and -negative BL, to identify specific patterns relying on the differential expression and role of Epstein-Barr virus-encoded microRNAs. First, we found significant differences in the expression of viral microRNAs and in selected target genes. Among others, we identified LIN28B, CGNL1, GCET2, MRAS, PLCD4, SEL1L, SXX1, and the tyrosine kinases encoding STK10/STK33, all provided with potential pathogenetic significance. GCET2, also validated by immunohistochemistry, appeared to be a useful marker for distinguishing EBV-positive and EBV-negative cases. Further, we provided solid evidences that the EBV-encoded microRNAs (e.g. BART6) significantly mold the transcriptional landscape of Burkitt Lymphoma clones. In conclusion, our data indicated significant differences in the transcriptional profiles of EBV-positive and EBV-negative BL and highlight the role of virus encoded miRNA.
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Affiliation(s)
- Pier Paolo Piccaluga
- Hematopathology Section, Department of Experimental, Diagnostic, and Experimental Medicine, S. Orsola-Malpighi Hospital, Bologna University School of Medicine, Bologna, Italy
| | - Mohsen Navari
- Hematopathology Section, Department of Experimental, Diagnostic, and Experimental Medicine, S. Orsola-Malpighi Hospital, Bologna University School of Medicine, Bologna, Italy.,Department of Medical Biotechnology, University of Siena, Siena, Italy
| | - Giulia De Falco
- Department of Medical Biotechnology, University of Siena, Siena, Italy.,School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | | | - Stefano Lazzi
- Department of Medical Biotechnology, University of Siena, Siena, Italy
| | - Fabio Fuligni
- Hematopathology Section, Department of Experimental, Diagnostic, and Experimental Medicine, S. Orsola-Malpighi Hospital, Bologna University School of Medicine, Bologna, Italy
| | - Cristiana Bellan
- Department of Medical Biotechnology, University of Siena, Siena, Italy
| | - Maura Rossi
- Hematopathology Section, Department of Experimental, Diagnostic, and Experimental Medicine, S. Orsola-Malpighi Hospital, Bologna University School of Medicine, Bologna, Italy
| | - Maria Rosaria Sapienza
- Hematopathology Section, Department of Experimental, Diagnostic, and Experimental Medicine, S. Orsola-Malpighi Hospital, Bologna University School of Medicine, Bologna, Italy
| | - Maria Antonella Laginestra
- Hematopathology Section, Department of Experimental, Diagnostic, and Experimental Medicine, S. Orsola-Malpighi Hospital, Bologna University School of Medicine, Bologna, Italy
| | - Maryam Etebari
- Hematopathology Section, Department of Experimental, Diagnostic, and Experimental Medicine, S. Orsola-Malpighi Hospital, Bologna University School of Medicine, Bologna, Italy
| | - Emily A Rogena
- Department of Pathology, University of Nairobi, Nairobi, Kenya
| | | | - Claudio Tripodo
- Tumour Immunology Unit, Department of Health Science, Human Pathology Section, Palermo University School of Medicine, Palermo, Italy
| | - Davide Gibellini
- Department of Pathology and Diagnostic, University of Verona, Verona, Italy
| | - Jessica Consiglio
- Department of Molecular Virology, Immunology, and Medical Genetics, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Carlo M Croce
- Department of Molecular Virology, Immunology, and Medical Genetics, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Stefano A Pileri
- Diagnostic Hematopathology Unit, European Institute of Oncology, Milan, Italy
| | - Lorenzo Leoncini
- Department of Medical Biotechnology, University of Siena, Siena, Italy
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122
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Zhou L, Bu Y, Liang Y, Zhang F, Zhang H, Li S. Epstein-Barr Virus (EBV)-BamHI-A Rightward Transcript (BART)-6 and Cellular MicroRNA-142 Synergistically Compromise Immune Defense of Host Cells in EBV-Positive Burkitt Lymphoma. Med Sci Monit 2016; 22:4114-4120. [PMID: 27796281 PMCID: PMC5094474 DOI: 10.12659/msm.897306] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background This study was designed to explore the molecular mechanism underlying the effect of cellular miRNAs and EBV miRNA upon the expression of targets such as PTEN, and their involvement in the pathogenesis of Burkitt lymphoma. Material/Methods In this study, we examined several differentially expressed cellular miRNAs in EBV-positive versus EBV-negative Burkett lymphoma tissue samples, and confirmed PTEN as targets of cellular miR-142 by using a bioinformatics tool, luciferase reporter system, oligo transfection, real-time PCR, and Western blot analysis. Results We further confirmed the binding site of miR-142 in the 3′UTR of the target genes, and established the negative regulatory relationship between miRNA and mRNAs with luciferase activity assay. To verify the regulatory relationship between the miRNAs and PTEN, we evaluated the expression of PTEN in the tissue samples, and found that PTEN was downregulated in EBV- positive Burkett lymphoma. Additionally, lymphoma cells were transfected with EBV-BART-6-3p and miR-142 and we found that EBV-BART-6-3p and miR-142 synergistically reduced expression of IL-6R and PTEN. Furthermore, we also examined viability of the cells in each treatment group, and showed that EBV-BART-6-3p and miR-142 synergistically promoted proliferation of the cells. Conclusions These findings improve our knowledge about the role of miR-142/EBV-BART-6-3p and their target, PTEN, in the development of Burkett lymphoma; they could be novel therapeutic targets for the treatment of EBV-positive Burkett lymphoma.
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Affiliation(s)
- Ling Zhou
- Department of Hematology, The First People's Hospital, Jining, Shandong, China (mainland)
| | - Yunwen Bu
- Department of Hematology, The First People's Hospital, Jining, Shandong, China (mainland)
| | - Yanyan Liang
- Department of Hematology, The First People's Hospital, Jining, Shandong, China (mainland)
| | - Fang Zhang
- Department of Hematology, The First People's Hospital, Jining, Shandong, China (mainland)
| | - Haiguo Zhang
- Department of Hematology, The First People's Hospital, Jining, Shandong, China (mainland)
| | - Shumei Li
- Department of Hematology, The First People's Hospital, Jining, Shandong, China (mainland)
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123
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Choi H, Lee SK. TAX1BP1 downregulation by EBV-miR-BART15-3p enhances chemosensitivity of gastric cancer cells to 5-FU. Arch Virol 2016; 162:369-377. [PMID: 27757686 DOI: 10.1007/s00705-016-3109-z] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 10/05/2016] [Indexed: 12/11/2022]
Abstract
MicroRNAs (miRNAs) are a class of noncoding RNA molecules approximately 19 to 25 nucleotides in length that downregulate the expression of target genes at the post-transcriptional level by binding to the 3'-untranslated region (3'-UTR). Epstein-Barr virus (EBV) generates at least 44 miRNAs, but the functions of most of these miRNAs have not yet been identified. Previously, we reported BRUCE as a target of miR-BART15-3p, a miRNA produced by EBV, but our data suggested that there might be other apoptosis-associated target genes of miR-BART15-3p. Thus, in this study, we searched for new target genes of miR-BART15-3p using in silico analyses. We found a possible seed match site in the 3'-UTR of Tax1-binding protein 1 (TAX1BP1). The luciferase activity of a reporter vector including the 3'-UTR of TAX1BP1 was decreased by miR-BART15-3p. MiR-BART15-3p downregulated the expression of TAX1BP1 mRNA and protein in AGS cells, while an inhibitor against miR-BART15-3p upregulated the expression of TAX1BP1 mRNA and protein in AGS-EBV cells. Mir-BART15-3p modulated NF-κB activity in gastric cancer cell lines. Moreover, miR-BART15-3p strongly promoted chemosensitivity to 5-fluorouracil (5-FU). Our results suggest that miR-BART15-3p targets the anti-apoptotic TAX1BP1 gene in cancer cells, causing increased apoptosis and chemosensitivity to 5-FU.
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Affiliation(s)
- Hoyun Choi
- Department of Medical Lifescience, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul, 06591, Republic of Korea
| | - Suk Kyeong Lee
- Department of Medical Lifescience, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul, 06591, Republic of Korea.
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124
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Epstein-Barr virus microRNAs reduce immune surveillance by virus-specific CD8+ T cells. Proc Natl Acad Sci U S A 2016; 113:E6467-E6475. [PMID: 27698133 DOI: 10.1073/pnas.1605884113] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Infection with Epstein-Barr virus (EBV) affects most humans worldwide and persists life-long in the presence of robust virus-specific T-cell responses. In both immunocompromised and some immunocompetent people, EBV causes several cancers and lymphoproliferative diseases. EBV transforms B cells in vitro and encodes at least 44 microRNAs (miRNAs), most of which are expressed in EBV-transformed B cells, but their functions are largely unknown. Recently, we showed that EBV miRNAs inhibit CD4+ T-cell responses to infected B cells by targeting IL-12, MHC class II, and lysosomal proteases. Here we investigated whether EBV miRNAs also counteract surveillance by CD8+ T cells. We have found that EBV miRNAs strongly inhibit recognition and killing of infected B cells by EBV-specific CD8+ T cells through multiple mechanisms. EBV miRNAs directly target the peptide transporter subunit TAP2 and reduce levels of the TAP1 subunit, MHC class I molecules, and EBNA1, a protein expressed in most forms of EBV latency and a target of EBV-specific CD8+ T cells. Moreover, miRNA-mediated down-regulation of the cytokine IL-12 decreases the recognition of infected cells by EBV-specific CD8+ T cells. Thus, EBV miRNAs use multiple, distinct pathways, allowing the virus to evade surveillance not only by CD4+ but also by antiviral CD8+ T cells.
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125
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Morscio J, Tousseyn T. Recent insights in the pathogenesis of post-transplantation lymphoproliferative disorders. World J Transplant 2016; 6:505-516. [PMID: 27683629 PMCID: PMC5036120 DOI: 10.5500/wjt.v6.i3.505] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2016] [Revised: 06/30/2016] [Accepted: 08/18/2016] [Indexed: 02/05/2023] Open
Abstract
Post-transplant lymphoproliferative disorder (PTLD) is an aggressive complication of solid organ and hematopoietic stem cell transplantation that arises in up to 20% of transplant recipients. Infection or reactivation of the Epstein-Barr virus (EBV), a ubiquitous human herpesvirus, in combination with chronic immunosuppression are considered as the main predisposing factors, however insight in PTLD biology is fragmentary. The study of PTLD is complicated by its morphological heterogeneity and the lack of prospective trials, which also impede treatment optimization. Furthermore, the broad spectrum of underlying disorders and the graft type represent important confounding factors. PTLD encompasses different malignant subtypes that resemble histologically similar lymphomas in the general population. Post-transplant diffuse large B-cell lymphoma (PT-DLBCL), Burkitt lymphoma (PT-BL) and plasmablastic lymphoma (PT-PBL) occur most frequently. However, in many studies various EBV+ and EBV- PTLD subtypes are pooled, complicating the interpretation of the results. In this review, studies of the gene expression pattern, the microenvironment and the genetic profile of PT-DLBCL, PT-BL and PT-PBL are summarized to better understand the mechanisms underlying post-transplantation lymphomagenesis. Based on the available findings we propose stratification of PTLD according to the histological subtype and the EBV status to facilitate the interpretation of future studies and the establishment of clinical trials.
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126
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Tagawa T, Albanese M, Bouvet M, Moosmann A, Mautner J, Heissmeyer V, Zielinski C, Lutter D, Hoser J, Hastreiter M, Hayes M, Sugden B, Hammerschmidt W. Epstein-Barr viral miRNAs inhibit antiviral CD4+ T cell responses targeting IL-12 and peptide processing. J Exp Med 2016; 213:2065-80. [PMID: 27621419 PMCID: PMC5030804 DOI: 10.1084/jem.20160248] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 08/01/2016] [Indexed: 12/14/2022] Open
Abstract
EBV reduces the activation of cytotoxic CD4+ effector T cells by inducing a state of reduced immunogenicity in infected B cells. EBV-derived miRNAs suppress release of proinflammatory cytokines, interfere with peptide processing and presentation on HLA class II, repress differentiation of naive CD4+ T cells to Th1 cells, and ultimately avoid killing of infected B cells. Epstein-Barr virus (EBV) is a tumor virus that establishes lifelong infection in most of humanity, despite eliciting strong and stable virus-specific immune responses. EBV encodes at least 44 miRNAs, most of them with unknown function. Here, we show that multiple EBV miRNAs modulate immune recognition of recently infected primary B cells, EBV's natural target cells. EBV miRNAs collectively and specifically suppress release of proinflammatory cytokines such as IL-12, repress differentiation of naive CD4+ T cells to Th1 cells, interfere with peptide processing and presentation on HLA class II, and thus reduce activation of cytotoxic EBV-specific CD4+ effector T cells and killing of infected B cells. Our findings identify a previously unknown viral strategy of immune evasion. By rapidly expressing multiple miRNAs, which are themselves nonimmunogenic, EBV counteracts recognition by CD4+ T cells and establishes a program of reduced immunogenicity in recently infected B cells, allowing the virus to express viral proteins required for establishment of life-long infection.
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Affiliation(s)
- Takanobu Tagawa
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Partner site Munich, Germany, D-81377 Munich, Germany German Centre for Infection Research (DZIF), Partner site Munich, Germany, D-81377 Munich, Germany
| | - Manuel Albanese
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Partner site Munich, Germany, D-81377 Munich, Germany German Centre for Infection Research (DZIF), Partner site Munich, Germany, D-81377 Munich, Germany
| | - Mickaël Bouvet
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Partner site Munich, Germany, D-81377 Munich, Germany German Centre for Infection Research (DZIF), Partner site Munich, Germany, D-81377 Munich, Germany
| | - Andreas Moosmann
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Partner site Munich, Germany, D-81377 Munich, Germany German Centre for Infection Research (DZIF), Partner site Munich, Germany, D-81377 Munich, Germany
| | - Josef Mautner
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Partner site Munich, Germany, D-81377 Munich, Germany German Centre for Infection Research (DZIF), Partner site Munich, Germany, D-81377 Munich, Germany Children's Hospital, Technical University Munich, D-80337 Munich, Germany
| | - Vigo Heissmeyer
- Research Unit Molecular Immune Regulation, Institute of Molecular Immunology, Helmholtz Zentrum München, German Research Center for Environmental Health Munich, University of Munich, D-80539 Munich, Germany Institute for Immunology, University of Munich, D-80539 Munich, Germany
| | - Christina Zielinski
- Institute for Medical Microbiology, Immunology and Hygiene, Technical University Munich, D-80337 Munich, Germany
| | - Dominik Lutter
- Institute for Diabetes and Obesity, Helmholtz Zentrum München, German Research Center for Environmental Health, D-85764 Munich, Germany
| | - Jonathan Hoser
- Institute of Bioinformatics and System Biology, Helmholtz Zentrum München, German Research Center for Environmental Health, D-85764 Munich, Germany
| | - Maximilian Hastreiter
- Institute of Bioinformatics and System Biology, Helmholtz Zentrum München, German Research Center for Environmental Health, D-85764 Munich, Germany
| | - Mitch Hayes
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, WI 53706
| | - Bill Sugden
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, WI 53706
| | - Wolfgang Hammerschmidt
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Partner site Munich, Germany, D-81377 Munich, Germany German Centre for Infection Research (DZIF), Partner site Munich, Germany, D-81377 Munich, Germany
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Epstein-Barr virus-encoded miR-BART6-3p inhibits cancer cell metastasis and invasion by targeting long non-coding RNA LOC553103. Cell Death Dis 2016; 7:e2353. [PMID: 27584792 PMCID: PMC5059857 DOI: 10.1038/cddis.2016.253] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 06/28/2016] [Accepted: 07/19/2016] [Indexed: 12/12/2022]
Abstract
Epstein-Barr virus (EBV) infection is causatively related to a variety of human cancers, including nasopharyngeal carcinoma (NPC) and gastric cancer (GC). EBV encodes 44 mature miRNAs, a number of which have been proven to promote carcinogenesis by targeting host genes or self-viral genes. However, in this study, we found that an EBV-encoded microRNA, termed EBV-miR-BART6-3p, inhibited EBV-associated cancer cell migration and invasion including NPC and GC by reversing the epithelial-mesenchymal transition (EMT) process. Using microarray analysis, we identified and validated that a novel long non-coding RNA (lncRNA) LOC553103 was downregulated by EBV-miR-BART6-3p, and LOC553103 knockdown by specific siRNAs phenocopied the effect of EBV-miR-BART6-3p, while LOC553103 overexpression promoted cancer cell migration and invasion to facilitate EMT. In conclusion, we determined that EBV-miR-BART6-3p, a microRNA encoded by oncogenic EBV, inhibited EBV-associated cancer cell migration and invasion by targeting and downregulating a novel lncRNA LOC553103. Thus, our study presents an unreported mechanism underlying EBV infection in EBV-associated cancer carcinogenesis, and provides a potential novel diagnosis and treatment biomarker for NPC and other EBV-related cancers.
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128
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Harold C, Cox D, Riley KJ. Epstein-Barr viral microRNAs target caspase 3. Virol J 2016; 13:145. [PMID: 27565721 PMCID: PMC5002152 DOI: 10.1186/s12985-016-0602-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 08/19/2016] [Indexed: 12/25/2022] Open
Abstract
The Epstein-Barr virus (EBV) is a ubiquitous herpesvirus that transforms B cells and causes several malignancies including Burkitt’s lymphoma. EBV differentially expresses at least 49 mature microRNAs (miRNAs) during latency in various infected epithelial and B cells. Recent high-throughput studies and functional assays have begun to reveal the function of the EBV miRNAs suggesting roles in latency, cell cycle control, and apoptosis. In particular, the central executioner of apoptosis, Caspase 3 (CASP3), was proposed as a target of select EBV miRNAs. However, whether CASP3 is truly a target of EBV miRNAs, and if so, which specific miRNAs target CASP3 is still under debate. Based on previously published high-throughput biochemical data and a bioinformatic analysis of the entire CASP3 3′-UTR, we identified 12 EBV miRNAs that have one or more seed binding sites in the CASP3 3′-UTR. We individually tested all 12 miRNAs for repression of CASP3 in luciferase reporter assays, and nine showed statistically significant (P < 0.001) repression of a full-length CASP3 reporter. Further, three EBV miRNAs, including BART22, exhibited repression of endogenous CASP3 protein. These data confirm that CASP3 is a direct target of specific EBV BART miRNAs.
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Affiliation(s)
- Cecelia Harold
- Department of Chemistry, Rollins College, Winter Park, FL, 32789, USA.,Present Address: Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Diana Cox
- Department of Chemistry, Rollins College, Winter Park, FL, 32789, USA.,Present Address: Baylor College of Medicine, Houston, TX, 77030, USA
| | - Kasandra J Riley
- Department of Chemistry, Rollins College, Winter Park, FL, 32789, USA.
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129
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Hooykaas MJG, Kruse E, Wiertz EJHJ, Lebbink RJ. Comprehensive profiling of functional Epstein-Barr virus miRNA expression in human cell lines. BMC Genomics 2016; 17:644. [PMID: 27531524 PMCID: PMC4987988 DOI: 10.1186/s12864-016-2978-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 07/28/2016] [Indexed: 12/21/2022] Open
Abstract
Background Epstein-Barr virus (EBV) establishes lifelong infections in its human host. The virus is associated with a broad range of malignancies of lymphoid and epithelial origin, including Burkitt’s lymphoma, post-transplant lymphoproliferative disease, nasopharyngeal carcinoma and gastric carcinoma. During the latent phase of its life cycle, EBV expresses more than 40 mature miRNAs that are highly abundant in tumor cells and may contribute to oncogenesis. Although multiple studies have assessed the relative expression profiles of EBV miRNAs in tumor cells, data linking these expression levels to functional target knockdown are mostly lacking. Therefore we set out to systematically assess the EBV miRNA expression levels in EBV+ tumor cell lines, and correlate this to their functional silencing capacity in these cells. Results We provide comprehensive EBV miRNA expression profiles of the EBV+ cell lines C666-1 (nasopharyngeal carcinoma), SNU-719 (gastric carcinoma), Jijoye (Burkitt’s lymphoma), and AKBM (Burkitt’s lymphoma) and of EBV− cells ectopically expressing the BART miRNA cluster. By deep sequencing the small RNA population and conducting miRNA-reporter experiments to assay miRNA potency, we were able to compare the expression profiles of the EBV miRNAs with their functional silencing efficacy. We observe a strong correlation between miRNA expression levels and functional miRNA activity. There is large variation in expression levels between EBV miRNAs in a given cell line, whereas the relative expression profiles are well maintained between cell lines. Furthermore, we show that miRNA arm selection bias is less pronounced for gamma-herpesvirus miRNAs than for human miRNAs. Conclusion We provide an in depth assessment of the expression levels and silencing activity of all EBV miRNAs in B- and epithelial cell lines of different latency stages. Our data show a good correlation between relative EBV miRNA expression levels and silencing capacity, and suggest preferential processing of particular EBV miRNAs irrespective of cell-type. In addition to encoding the largest number of precursor miRNAs of all human herpesviruses, EBV expresses many miRNAs precursors that yield two functional miRNA strands, rather than one guide strand and a non-functional passenger strand. This reduced strand bias may increase the size of the EBV miRNA targetome. Electronic supplementary material The online version of this article (doi:10.1186/s12864-016-2978-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Marjolein J G Hooykaas
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Elisabeth Kruse
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Emmanuel J H J Wiertz
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands.
| | - Robert Jan Lebbink
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands.
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130
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Zhou C, Xie Z, Gao L, Liu C, Ai J, Zhang L, Shen K. Profiling of EBV-Encoded microRNAs in EBV-Associated Hemophagocytic Lymphohistiocytosis. TOHOKU J EXP MED 2016; 237:117-26. [PMID: 26423217 DOI: 10.1620/tjem.237.117] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Epstein-Barr virus-associated hemophagocytic lymphohistiocytosis (EBV-HLH) is a life-threatening complication of EBV infection. MicroRNAs (miRNAs) were small non-coding RNA, and EBV could encode miRNAs that are involved in the progression of infection. However, the profiles of EBV-miRNAs in EBV-HLH were unknown. Here, we aimed to profile the expression of EBV-miRNAs in children with EBV-HLH by analyzing 44 known EBV-miRNAs, encoded within the BamHI fragment H rightward open reading frame 1 (BHRF1) and the BamHI-A region rightward transcript (BART), in plasma and cellular targets by real-time quantitative PCR. The study included 15 children with EBV-HLH, 15 children with infectious mononucleosis (IM), and 15 healthy controls. CD8(+) T cells were found to be the cellular target of EBV infection in EBV-HLH, while CD19(+) B cells were infected with EBV in IM. We also found the greater levels of several miRNAs encoded by BART in EBV-HLH, compared to those in IM and healthy controls, whereas the levels of BHRF1 miRNAs were lower than those in IM. The profile and pattern of EBV-miRNAs in EBV-HLH indicated that EBV could display type II latency in EBV-HLH. Importantly, the level of plasma miR-BART16-1 continued decreasing during the whole chemotherapy, suggesting that plasma miR-BART16-1 could be a potential biomarker for monitoring EBV-HLH progression. The pathogenesis of EBV-HLH might be attributed to the abundance of EBV-miRNAs in EBV-HLH. These findings help elucidate the roles of EBV miRNAs in EBV-HLH, enabling the understanding of the basis of this disease and providing clues for its treatment.
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Affiliation(s)
- Chen Zhou
- Virology Laboratory, Capital Medical University Affiliated Beijing Children's Hospital
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131
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Herbert KM, Nag A. A Tale of Two RNAs during Viral Infection: How Viruses Antagonize mRNAs and Small Non-Coding RNAs in The Host Cell. Viruses 2016; 8:E154. [PMID: 27271653 PMCID: PMC4926174 DOI: 10.3390/v8060154] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 05/12/2016] [Accepted: 05/20/2016] [Indexed: 02/06/2023] Open
Abstract
Viral infection initiates an array of changes in host gene expression. Many viruses dampen host protein expression and attempt to evade the host anti-viral defense machinery. Host gene expression is suppressed at several stages of host messenger RNA (mRNA) formation including selective degradation of translationally competent messenger RNAs. Besides mRNAs, host cells also express a variety of noncoding RNAs, including small RNAs, that may also be subject to inhibition upon viral infection. In this review we focused on different ways viruses antagonize coding and noncoding RNAs in the host cell to its advantage.
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Affiliation(s)
- Kristina M Herbert
- Department of Experimental Microbiology, Center for Scientific Research and Higher Education of Ensenada (CICESE), Ensenada, Baja California 22860, Mexico.
| | - Anita Nag
- Department of Chemistry, Florida A&M University, Tallahassee, FL 32307, USA.
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132
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Piedade D, Azevedo-Pereira JM. The Role of microRNAs in the Pathogenesis of Herpesvirus Infection. Viruses 2016; 8:v8060156. [PMID: 27271654 PMCID: PMC4926176 DOI: 10.3390/v8060156] [Citation(s) in RCA: 122] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 05/25/2016] [Accepted: 05/30/2016] [Indexed: 02/07/2023] Open
Abstract
MicroRNAs (miRNAs) are small non-coding RNAs important in gene regulation. They are able to regulate mRNA translation through base-pair complementarity. Cellular miRNAs have been involved in the regulation of nearly all cellular pathways, and their deregulation has been associated with several diseases such as cancer. Given the importance of microRNAs to cell homeostasis, it is no surprise that viruses have evolved to take advantage of this cellular pathway. Viruses have been reported to be able to encode and express functional viral microRNAs that target both viral and cellular transcripts. Moreover, viral inhibition of key proteins from the microRNA pathway and important changes in cellular microRNA pool have been reported upon viral infection. In addition, viruses have developed multiple mechanisms to avoid being targeted by cellular microRNAs. This complex interaction between host and viruses to control the microRNA pathway usually favors viral infection and persistence by either reducing immune detection, avoiding apoptosis, promoting cell growth, or promoting lytic or latent infection. One of the best examples of this virus-host-microRNA interplay emanates from members of the Herperviridae family, namely the herpes simplex virus type 1 and type 2 (HSV-1 and HSV-2), human cytomegalovirus (HCMV), human herpesvirus 8 (HHV-8), and the Epstein–Barr virus (EBV). In this review, we will focus on the general functions of microRNAs and the interactions between herpesviruses, human hosts, and microRNAs and will delve into the related mechanisms that contribute to infection and pathogenesis.
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Affiliation(s)
- Diogo Piedade
- Host-Pathogen Interaction Unit, iMed.ULisboa, Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisboa, Portugal.
| | - José Miguel Azevedo-Pereira
- Host-Pathogen Interaction Unit, iMed.ULisboa, Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisboa, Portugal.
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133
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Development of a Low-Cost Stem-Loop Real-Time Quantification PCR Technique for EBV miRNA Expression Analysis. Mol Biotechnol 2016; 58:540-50. [DOI: 10.1007/s12033-016-9951-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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134
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Banerjee S, Uppal T, Strahan R, Dabral P, Verma SC. The Modulation of Apoptotic Pathways by Gammaherpesviruses. Front Microbiol 2016; 7:585. [PMID: 27199919 PMCID: PMC4847483 DOI: 10.3389/fmicb.2016.00585] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Accepted: 04/11/2016] [Indexed: 12/11/2022] Open
Abstract
Apoptosis or programmed cell death is a tightly regulated process fundamental for cellular development and elimination of damaged or infected cells during the maintenance of cellular homeostasis. It is also an important cellular defense mechanism against viral invasion. In many instances, abnormal regulation of apoptosis has been associated with a number of diseases, including cancer development. Following infection of host cells, persistent and oncogenic viruses such as the members of the Gammaherpesvirus family employ a number of different mechanisms to avoid the host cell’s “burglar” alarm and to alter the extrinsic and intrinsic apoptotic pathways by either deregulating the expressions of cellular signaling genes or by encoding the viral homologs of cellular genes. In this review, we summarize the recent findings on how gammaherpesviruses inhibit cellular apoptosis via virus-encoded proteins by mediating modification of numerous signal transduction pathways. We also list the key viral anti-apoptotic proteins that could be exploited as effective targets for novel antiviral therapies in order to stimulate apoptosis in different types of cancer cells.
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Affiliation(s)
- Shuvomoy Banerjee
- Amity Institute of Virology and Immunology, Amity University Noida, India
| | - Timsy Uppal
- Department of Microbiology and Immunology, Center for Molecular Medicine, School of Medicine, University of Nevada, Reno Reno, NV, USA
| | - Roxanne Strahan
- Department of Microbiology and Immunology, Center for Molecular Medicine, School of Medicine, University of Nevada, Reno Reno, NV, USA
| | - Prerna Dabral
- Department of Microbiology and Immunology, Center for Molecular Medicine, School of Medicine, University of Nevada, Reno Reno, NV, USA
| | - Subhash C Verma
- Department of Microbiology and Immunology, Center for Molecular Medicine, School of Medicine, University of Nevada, Reno Reno, NV, USA
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Role of Viral miRNAs and Epigenetic Modifications in Epstein-Barr Virus-Associated Gastric Carcinogenesis. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:6021934. [PMID: 26977250 PMCID: PMC4764750 DOI: 10.1155/2016/6021934] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 01/12/2016] [Accepted: 01/14/2016] [Indexed: 01/26/2023]
Abstract
MicroRNAs are short (21–23 nucleotides), noncoding RNAs that typically silence posttranscriptional gene expression through interaction with target messenger RNAs. Currently, miRNAs have been identified in almost all studied multicellular eukaryotes in the plant and animal kingdoms. Additionally, recent studies reported that miRNAs can also be encoded by certain single-cell eukaryotes and by viruses. The vast majority of viral miRNAs are encoded by the herpesviruses family. These DNA viruses including Epstein-Barr virus encode their own miRNAs and/or manipulate the expression of cellular miRNAs to facilitate respective infection cycles. Modulation of the control pathways of miRNAs expression is often involved in the promotion of tumorigenesis through a specific cascade of transduction signals. Notably, latent infection with Epstein-Barr virus is considered liable of causing several types of malignancies, including the majority of gastric carcinoma cases detected worldwide. In this review, we describe the role of the Epstein-Barr virus in gastric carcinogenesis, summarizing the functions of the Epstein-Barr virus-encoded viral proteins and related epigenetic alterations as well as the roles of Epstein-Barr virus-encoded and virally modulated cellular miRNAs.
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Li L, Feng H, Da Q, Jiang H, Chen L, Xie L, Huang Q, Xiong H, Luo F, Kang L, Zeng Y, Hu H, Hou W, Feng Y. Expression of HIV-encoded microRNA-TAR and its inhibitory effect on viral replication in human primary macrophages. Arch Virol 2016; 161:1115-23. [PMID: 26831929 DOI: 10.1007/s00705-016-2755-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 01/07/2016] [Indexed: 12/12/2022]
Abstract
A number of virus-encoded microRNAs have been shown to play important roles in virus replication and virus-host interactions, although the expression and function of miR-TAR-3p derived from the human immunodeficiency virus type 1 (HIV-1) TAR element remain controversial. In this study, miR-TAR-3p was detected in human peripheral blood monocyte-derived macrophages (MDMs) infected by HIV-1. Overexpression of miR-TAR-3p impaired viral replication, while inhibition of miR-TAR-3p enhanced it. Additionally, miR-TAR-3p repressed viral transcription and replication by targeting the TAR element in the HIV-1 5'-LTR in a sequence-specific manner. These results confirm the presence of miR-TAR-3p in HIV-1-infected MDMs and suggest that its function might be used as a mechanism to modulate HIV-1 replication through the expression of a negative regulatory factor.
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Affiliation(s)
- Li Li
- School of Basic Medical Sciences, Wuhan University, 185 Donghu Road, Wuchang, Wuhan, 430070, Hubei, People's Republic of China
- State Key Laboratory of Virology, Wuhan University, Wuhan, 430072, Hubei, People's Republic of China
| | - Haimin Feng
- School of Basic Medical Sciences, Wuhan University, 185 Donghu Road, Wuchang, Wuhan, 430070, Hubei, People's Republic of China
| | - Qin Da
- Hubei Center for Disease Control and Prevention, Wuhan, 430079, Hubei, People's Republic of China
| | - Honglin Jiang
- Hubei Center for Disease Control and Prevention, Wuhan, 430079, Hubei, People's Republic of China
| | - Lang Chen
- School of Basic Medical Sciences, Wuhan University, 185 Donghu Road, Wuchang, Wuhan, 430070, Hubei, People's Republic of China
| | - Linlin Xie
- School of Basic Medical Sciences, Wuhan University, 185 Donghu Road, Wuchang, Wuhan, 430070, Hubei, People's Republic of China
| | - Qiuling Huang
- School of Basic Medical Sciences, Wuhan University, 185 Donghu Road, Wuchang, Wuhan, 430070, Hubei, People's Republic of China
- State Key Laboratory of Virology, Wuhan University, Wuhan, 430072, Hubei, People's Republic of China
| | - Hairong Xiong
- School of Basic Medical Sciences, Wuhan University, 185 Donghu Road, Wuchang, Wuhan, 430070, Hubei, People's Republic of China
- State Key Laboratory of Virology, Wuhan University, Wuhan, 430072, Hubei, People's Republic of China
| | - Fan Luo
- School of Basic Medical Sciences, Wuhan University, 185 Donghu Road, Wuchang, Wuhan, 430070, Hubei, People's Republic of China
- State Key Laboratory of Virology, Wuhan University, Wuhan, 430072, Hubei, People's Republic of China
| | - Lei Kang
- State Key Laboratory of Virology, Wuhan University, Wuhan, 430072, Hubei, People's Republic of China
| | - Yan Zeng
- Department of Zoology, College of Life Sciences, Nanjing Agriculture University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Haitao Hu
- Department of Microbiology and Immunology, Sealy Center for Vaccine Development, University of Texas Medical Branch, Galveston, TX, 77555, USA
| | - Wei Hou
- School of Basic Medical Sciences, Wuhan University, 185 Donghu Road, Wuchang, Wuhan, 430070, Hubei, People's Republic of China.
- State Key Laboratory of Virology, Wuhan University, Wuhan, 430072, Hubei, People's Republic of China.
| | - Yong Feng
- School of Basic Medical Sciences, Wuhan University, 185 Donghu Road, Wuchang, Wuhan, 430070, Hubei, People's Republic of China.
- State Key Laboratory of Virology, Wuhan University, Wuhan, 430072, Hubei, People's Republic of China.
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Stamatiou DP, Derdas SP, Zoras OL, Spandidos DA. Herpes and polyoma family viruses in thyroid cancer. Oncol Lett 2016; 11:1635-1644. [PMID: 26998055 PMCID: PMC4774504 DOI: 10.3892/ol.2016.4144] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 01/26/2016] [Indexed: 02/06/2023] Open
Abstract
Thyroid cancer is considered the most common malignancy that affects the endocrine system. Generally, thyroid cancer derives from follicular epithelial cells, and thyroid cancer is divided into well-differentiated papillary (80% of cases) and follicular (15% of cases) carcinoma. Follicular thyroid cancer is further divided into the conventional and oncocytic (Hürthle cell) type, poorly differentiated carcinoma and anaplastic carcinoma. Both poorly differentiated and anaplastic carcinoma can arise either de novo, or secondarily from papillary and follicular thyroid cancer. The incidence of thyroid cancer has significantly increased for both males and females of all ages, particularly for females between 55–64 years of age, from 1999 through 2008. The increased rates refer to tumors of all stages, though they were mostly noted in localized disease. Recently, viruses have been implicated in the direct regulation of epithelial-mesenchymal transition (EMT) and the development of metastases. More specifically, Epstein-Barr virus (EBV) proteins may potentially lead to the development of metastasis through the regulation of the metastasis suppressor, Nm23, and the control of Twist expression. The significant enhancement of the metastatic potential, through the induction of angiogenesis and changes to the tumor microenvironment, subsequent to viral infection, has been documented, while EMT also contributes to cancer cell permissiveness to viruses. A number of viruses have been identified to be associated with carcinogenesis, and these include lymphotropic herpesviruses, namely EBV and Kaposi's sarcoma-associated herpesvirus [KSHV, also known as human herpesvirus type 8 (HHV8)]; two hepatitis viruses, hepatitis B virus (HBV) and hepatitis C virus (HCV); human papillomaviruses (HPVs); human T cell lymphoma virus (HTLV); and a new polyomavirus, Merkel cell polyomavirus identified in 2008. In this review, we examined the association between thyroid cancer and two oncogenic virus families, the herpes and polyoma family viruses, and we discuss their potential role as causative agents in thyroid carcinogenesis.
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Affiliation(s)
- Dimitris P Stamatiou
- Department of Surgical Oncology, University Hospital, University of Crete, Heraklion 71003, Greece; Laboratory of Clinical Virology, University of Crete, Medical School, Heraklion 71409, Greece
| | - Stavros P Derdas
- Laboratory of Clinical Virology, University of Crete, Medical School, Heraklion 71409, Greece
| | - Odysseas L Zoras
- Department of Surgical Oncology, University Hospital, University of Crete, Heraklion 71003, Greece
| | - Demetrios A Spandidos
- Laboratory of Clinical Virology, University of Crete, Medical School, Heraklion 71409, Greece
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138
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Louten J, Beach M, Palermino K, Weeks M, Holenstein G. MicroRNAs Expressed during Viral Infection: Biomarker Potential and Therapeutic Considerations. Biomark Insights 2016; 10:25-52. [PMID: 26819546 PMCID: PMC4718089 DOI: 10.4137/bmi.s29512] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 10/22/2015] [Accepted: 10/24/2015] [Indexed: 12/13/2022] Open
Abstract
MicroRNAs (miRNAs) are short sequences of noncoding single-stranded RNAs that exhibit inhibitory effects on complementary target mRNAs. Recently, it has been discovered that certain viruses express their own miRNAs, while other viruses activate the transcription of cellular miRNAs for their own benefit. This review summarizes the viral and/or cellular miRNAs that are transcribed during infection, with a focus on the biomarker and therapeutic potential of miRNAs (or their antagomirs). Several human viruses of clinical importance are discussed, namely, herpesviruses, polyomaviruses, hepatitis B virus, hepatitis C virus, human papillomavirus, and human immunodeficiency virus.
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Affiliation(s)
- Jennifer Louten
- Department of Molecular and Cellular Biology, Kennesaw State University, Kennesaw, GA, USA
| | - Michael Beach
- Department of Molecular and Cellular Biology, Kennesaw State University, Kennesaw, GA, USA
| | - Kristina Palermino
- Department of Molecular and Cellular Biology, Kennesaw State University, Kennesaw, GA, USA
| | - Maria Weeks
- Department of Molecular and Cellular Biology, Kennesaw State University, Kennesaw, GA, USA
| | - Gabrielle Holenstein
- Department of Molecular and Cellular Biology, Kennesaw State University, Kennesaw, GA, USA
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139
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Bernhardt K, Haar J, Tsai MH, Poirey R, Feederle R, Delecluse HJ. A Viral microRNA Cluster Regulates the Expression of PTEN, p27 and of a bcl-2 Homolog. PLoS Pathog 2016; 12:e1005405. [PMID: 26800049 PMCID: PMC4723338 DOI: 10.1371/journal.ppat.1005405] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 12/28/2015] [Indexed: 11/19/2022] Open
Abstract
The Epstein-Barr virus (EBV) infects and transforms B-lymphocytes with high efficiency. This process requires expression of the viral latent proteins and of the 3 miR-BHRF1 microRNAs. Here we show that B-cells infected by a virus that lacks these non-coding RNAs (Δ123) grew more slowly between day 5 and day 20, relative to wild type controls. This effect could be ascribed to a reduced S phase entry combined with a moderately increased apoptosis rate. Whilst the first phenotypic trait was consistent with an enhanced PTEN expression in B-cells infected with Δ123, the second could be explained by very low BHRF1 protein and RNA levels in the same cells. Indeed, B-cells infected either by a recombinant virus that lacks the BHRF1 protein, a viral bcl-2 homolog, or by Δ123 underwent a similar degree of apoptosis, whereas knockouts of both BHRF1 microRNAs and protein proved transformation-incompetent. We find that that the miR-BHRF1-3 seed regions, and to a lesser extent those of miR-BHRF1-2 mediate these stimulatory effects. After this critical period, B-cells infected with the Δ123 mutant recovered a normal growth rate and became more resistant to provoked apoptosis. This resulted from an enhanced BHRF1 protein expression relative to cells infected with wild type viruses and correlated with decreased p27 expression, two pro-oncogenic events. The upregulation of BHRF1 can be explained by the observation that large BHRF1 mRNAs are the source of BHRF1 protein but are destroyed following BHRF1 microRNA processing, in particular of miR-BHRF1-2. The BHRF1 microRNAs are unlikely to directly target p27 but their absence may facilitate the selection of B-cells that express low levels of this protein. Thus, the BHRF1 microRNAs allowed a time-restricted expression of the BHRF1 protein to innocuously expand the virus B-cell reservoir during the first weeks post-infection without increasing long-term immune pressure.
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Affiliation(s)
- Katharina Bernhardt
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center, Heidelberg, Germany
- Inserm unit U1074, Heidelberg, Germany
| | - Janina Haar
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center, Heidelberg, Germany
- Inserm unit U1074, Heidelberg, Germany
| | - Ming-Han Tsai
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center, Heidelberg, Germany
- Inserm unit U1074, Heidelberg, Germany
| | - Remy Poirey
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center, Heidelberg, Germany
- Inserm unit U1074, Heidelberg, Germany
| | - Regina Feederle
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center, Heidelberg, Germany
- Inserm unit U1074, Heidelberg, Germany
| | - Henri-Jacques Delecluse
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center, Heidelberg, Germany
- Inserm unit U1074, Heidelberg, Germany
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140
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Epigenetic Alterations in Epstein-Barr Virus-Associated Diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 879:39-69. [DOI: 10.1007/978-3-319-24738-0_3] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Epstein-Barr virus infection and nasopharyngeal carcinoma: the other side of the coin. Anticancer Drugs 2015; 26:1017-25. [PMID: 26241803 DOI: 10.1097/cad.0000000000000276] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Oncogenic viruses may have a significant impact on the therapeutic management of several malignancies besides their well-known role in tumor pathogenesis. Epstein-Barr virus (EBV) induces neoplastic transformation of epithelial cells of the nasopharynx by various molecular mechanisms mostly involving activation of oncogenes and inactivation of tumor-suppressor genes. EBV infection can also induce the expression of several immunogenic peptides on the plasma membrane of the infected cells. Importantly, these virus-related antigens may be used as targets for antitumor immunotherapy-based treatment strategies. Two different immunotherapy strategies, namely adoptive and active immunotherapy, have been developed and strongly improved in the recent years. Furthermore, EBV infection may influence the use of targeted therapies for nasopharyngeal carcinoma (NPC) considering that the presence of EBV can induce important modifications in cell signaling. As an example, latent membrane protein type 1 is a viral transmembrane protein mainly involved in the cancerogenesis process, which can also mediate overexpression of the epidermal growth factor receptor (EGFR) in NPC cells, rendering them more sensitive to anti-EGFR therapy. Finally, EBV may induce epigenetic changes in the infected cells, such as DNA hypermethylation and histone deacetylation, that can sustain tumor growth and can thus be considered potential targets for novel therapies. In conclusion, EBV infection can modify important biological features of NPC cells, rendering them more vulnerable to both immunotherapy and targeted therapy.
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Lin X, Tsai MH, Shumilov A, Poirey R, Bannert H, Middeldorp JM, Feederle R, Delecluse HJ. The Epstein-Barr Virus BART miRNA Cluster of the M81 Strain Modulates Multiple Functions in Primary B Cells. PLoS Pathog 2015; 11:e1005344. [PMID: 26694854 PMCID: PMC4691206 DOI: 10.1371/journal.ppat.1005344] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 11/25/2015] [Indexed: 12/12/2022] Open
Abstract
The Epstein-Barr virus (EBV) is a B lymphotropic virus that infects the majority of the human population. All EBV strains transform B lymphocytes, but some strains, such as M81, also induce spontaneous virus replication. EBV encodes 22 microRNAs (miRNAs) that form a cluster within the BART region of the virus and have been previously been found to stimulate tumor cell growth. Here we describe their functions in B cells infected by M81. We found that the BART miRNAs are downregulated in replicating cells, and that exposure of B cells in vitro or in vivo in humanized mice to a BART miRNA knockout virus resulted in an increased proportion of spontaneously replicating cells, relative to wild type virus. The BART miRNAs subcluster 1, and to a lesser extent subcluster 2, prevented expression of BZLF1, the key protein for initiation of lytic replication. Thus, multiple BART miRNAs cooperate to repress lytic replication. The BART miRNAs also downregulated pro- and anti-apoptotic mediators such as caspase 3 and LMP1, and their deletion did not sensitize B-cells to apoptosis. To the contrary, the majority of humanized mice infected with the BART miRNA knockout mutant developed tumors more rapidly, probably due to enhanced LMP1 expression, although deletion of the BART miRNAs did not modify the virus transforming abilities in vitro. This ability to slow cell growth could be confirmed in non-humanized immunocompromized mice. Injection of resting B cells exposed to a virus that lacks the BART miRNAs resulted in accelerated tumor growth, relative to wild type controls. Therefore, we found that the M81 BART miRNAs do not enhance B-cell tumorigenesis but rather repress it. The repressive effects of the BART miRNAs on potentially pathogenic viral functions in infected B cells are likely to facilitate long-term persistence of the virus in the infected host. The Epstein-Barr virus (EBV) infects more than 90% of the human adult population. Although EBV usually causes an asymptomatic infection, it is oncogenic in a small proportion of infected individuals. EBV produces a large number of microRNAs, a type of RNA that controls the production of their proteins though multiple mechanisms. We addressed the role played by the BART microRNAs, a subgroup of the EBV microRNAs, by generating a virus that lacks them and by comparing the characteristics of this modified virus with those of the unmodified virus. We found that the BART microRNAs cooperate to curb EBV multiplication, both in infected cells and in humanized mice. Furthermore, the BART miRNAs did not potentiate EBV’s ability to form tumors in different types of mice, some of which are unable to mount an immune reaction against the virus, as could have been expected from the literature. This can be explained at the molecular level by the ability of the BART microRNAs to downregulate the synthesis of multiple cellular and viral proteins, among which caspase 3 and LMP1, two essential modulator of cell death and cell proliferation, are likely to play an important role in the outcome of the virus infection. Thus, the BART microRNAs negatively impact on two essential viral functions, probably to maintain a balance between the virus and its host.
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Affiliation(s)
- Xiaochen Lin
- Division of pathogenesis of Virus Associated Tumors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
- Inserm unit U1074, DKFZ, Heidelberg, Germany
| | - Ming-Han Tsai
- Division of pathogenesis of Virus Associated Tumors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
- Inserm unit U1074, DKFZ, Heidelberg, Germany
| | - Anatoliy Shumilov
- Division of pathogenesis of Virus Associated Tumors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
- Inserm unit U1074, DKFZ, Heidelberg, Germany
| | - Remy Poirey
- Division of pathogenesis of Virus Associated Tumors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
- Inserm unit U1074, DKFZ, Heidelberg, Germany
| | - Helmut Bannert
- Division of pathogenesis of Virus Associated Tumors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
- Inserm unit U1074, DKFZ, Heidelberg, Germany
| | - Jaap M. Middeldorp
- Department of Pathology, VU University Medical Center, Amsterdam, The Netherlands
| | - Regina Feederle
- Division of pathogenesis of Virus Associated Tumors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
- Inserm unit U1074, DKFZ, Heidelberg, Germany
| | - Henri-Jacques Delecluse
- Division of pathogenesis of Virus Associated Tumors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
- Inserm unit U1074, DKFZ, Heidelberg, Germany
- * E-mail:
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Abstract
Epstein-Barr virus (EBV) orthologues from non-human primates (NHPs) have been studied for nearly as long as EBV itself. Cross-reactive sera and DNA hybridization studies provided the first glimpses of the closely related herpesviruses that belonged to the same gamma-1 herpesvirus, or lymphocryptovirus, genus, as EBV. Over the years, detailed molecular and sequence analyses of LCVs that infect humans and other NHPs revealed similar colinear genome structures and homologous viral proteins expressed during latent and lytic infection. Despite these similarities, experimental infection of NHPs with EBV did not result in acute symptoms or persistent infection as observed in humans, suggesting some degree of host species restriction. Genome sequencing and a molecular clone of an LCV isolate from naturally infected rhesus macaques combined with domestic colonies of LCV-naïve rhesus macaques have opened the door to a unique experimental animal model that accurately reproduces the normal transmission, acute viremia, lifelong persistence, and immune responses found in EBV-infected humans. This chapter will summarize the advances made over the last 50 years in our understanding of LCVs that naturally infect both Old and New World NHPs, the recent, groundbreaking developments in the use of rhesus macaques as an animal model for EBV infection, and how NHP LCVs and the rhLCV animal model can advance future EBV research and the development of an EBV vaccine.
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Affiliation(s)
- Janine Mühe
- Department of Medicine, Harvard Medical School, Brigham and Women's Hospital, 181 Longwood Ave, Boston, MA, 02115
- Department of Molecular Biology and Immunobiology, Harvard Medical School, Brigham and Women's Hospital, 181 Longwood Ave, Boston, MA, 02115
| | - Fred Wang
- Department of Medicine, Harvard Medical School, Brigham and Women's Hospital, 181 Longwood Ave, Boston, MA, 02115.
- Department of Molecular Biology and Immunobiology, Harvard Medical School, Brigham and Women's Hospital, 181 Longwood Ave, Boston, MA, 02115.
- Infectious Diseases Division, Brigham and Women's Hospital, 181 Longwood Avenue, Boston, MA, USA.
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Abstract
EBV expresses a number of viral noncoding RNAs (ncRNAs) during latent infection, many of which have known regulatory functions and can post-transcriptionally regulate viral and/or cellular gene expression. With recent advances in RNA sequencing technologies, the list of identified EBV ncRNAs continues to grow. EBV-encoded RNAs (EBERs) , the BamHI-A rightward transcripts (BARTs) , a small nucleolar RNA (snoRNA) , and viral microRNAs (miRNAs) are all expressed during EBV infection in a variety of cell types and tumors. Recently, additional novel EBV ncRNAs have been identified. Viral miRNAs, in particular, have been under extensive investigation since their initial identification over ten years ago. High-throughput studies to capture miRNA targets have revealed a number of miRNA-regulated viral and cellular transcripts that tie into important biological networks. Functions for many EBV ncRNAs are still unknown; however, roles for many EBV miRNAs in latency and in tumorigenesis have begun to emerge. Ongoing mechanistic studies to elucidate the functions of EBV ncRNAs should unravel additional roles for ncRNAs in the viral life cycle. In this chapter, we will discuss our current knowledge of the types of ncRNAs expressed by EBV, their potential roles in viral latency, and their potential involvement in viral pathogenesis.
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145
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Dynamic expression of viral and cellular microRNAs in infectious mononucleosis caused by primary Epstein-Barr virus infection in children. Virol J 2015; 12:208. [PMID: 26634702 PMCID: PMC4669648 DOI: 10.1186/s12985-015-0441-y] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 11/30/2015] [Indexed: 11/29/2022] Open
Abstract
Background Epstein-Barr virus (EBV) was the first virus identified to encode microRNAs (miRNAs). Both of viral and human cellular miRNAs are important in EBV infection. However, the dynamic expression profile of miRNAs during primary EBV infection was unknown. This study aimed to investigate the dynamic expression profile of viral and cellular miRNAs in infectious mononucleosis (IM) caused by primary EBV infection. Methods The levels of viral and cellular miRNAs were measured in fifteen pediatric IM patients at three different time-points. Fifteen healthy children who were seropositive for EBV were enrolled in the control group. Relative expression levels of miRNAs were detected by quantitative real-time PCR (qPCR) assay. Results EBV-miR-BHRF1-1, 1-2-3P, miR-BART13-1, 19-3p, 11-3P, 12–1, and 16–1 in IM patients of early phase were significantly higher than in healthy children. Most cellular miRNAs of B cells, such as hsa-miR-155-5p, −34a-5p, −18b-5p, −181a-5p, and −142-5p were up-regulated; while most of cellular miRNAs of CD8 + T cells, such as hsa-miR-223, −29c-3p, −181a, −200a-3p, miR-155-5p, −146a, and −142-5p were down-regulated in IM patients. With disease progression, nearly all of EBV-miRNAs decreased, especially miR-BHRF1, but at a slower rate than EBV DNA loads. Most of the cellular miRNAs of B cells, including hsa-miR-134-5p, −18b-5p, −34a-5p, and -196a-5p increased with time. However, most of the cellular miRNAs of CD8 + T cells, including hsa-let-7a-5p, −142-3p, −142-5p, and −155-5p decreased with time. Additionally, hsa-miR-155-5p of B cells and hsa-miR-18b-5p of CD8+ T cells exhibited a positive correlation with miR-BHRF1-2-5P and miR-BART2-5P (0.96 ≤ r ≤ 0.99, P < 0.05). Finally, hsa-miR-181a-5p of B cells had positive correlation with miR-BART4-3p, 4-5P, 16–1, and 22 (0.97 ≤ r ≤ 0.99, P < 0.05). Conclusions Our study is the first to describe the expression profile of viral and cellular miRNAs in IM caused by primary EBV infection. These results might be the basis of investigating the pathogenic mechanism of EBV-related diseases and bring new insights into their diagnosis and treatment.
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Epstein-Barr Virus MicroRNA miR-BART20-5p Suppresses Lytic Induction by Inhibiting BAD-Mediated caspase-3-Dependent Apoptosis. J Virol 2015; 90:1359-68. [PMID: 26581978 DOI: 10.1128/jvi.02794-15] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Accepted: 11/08/2015] [Indexed: 01/22/2023] Open
Abstract
UNLABELLED Epstein-Barr virus (EBV) is a human gammaherpesvirus associated with a variety of tumor types. EBV can establish latency or undergo lytic replication in host cells. In general, EBV remains latent in tumors and expresses a limited repertoire of latent proteins to avoid host immune surveillance. When the lytic cycle is triggered by some as-yet-unknown form of stimulation, lytic gene expression and progeny virus production commence. Thus far, the exact mechanism of EBV latency maintenance and the in vivo triggering signal for lytic induction have yet to be elucidated. Previously, we have shown that the EBV microRNA miR-BART20-5p directly targets the immediate early genes BRLF1 and BZLF1 as well as Bcl-2-associated death promoter (BAD) in EBV-associated gastric carcinoma. In this study, we found that both mRNA and protein levels of BRLF1 and BZLF1 were suppressed in cells following BAD knockdown and increased after BAD overexpression. Progeny virus production was also downregulated by specific knockdown of BAD. Our results demonstrated that caspase-3-dependent apoptosis is a prerequisite for BAD-mediated EBV lytic cycle induction. Therefore, our data suggest that miR-BART20-5p plays an important role in latency maintenance and tumor persistence of EBV-associated gastric carcinoma by inhibiting BAD-mediated caspase-3-dependent apoptosis, which would trigger immediate early gene expression. IMPORTANCE EBV has an ability to remain latent in host cells, including EBV-associated tumor cells hiding from immune surveillance. However, the exact molecular mechanisms of EBV latency maintenance remain poorly understood. Here, we demonstrated that miR-BART20-5p inhibited the expression of EBV immediate early genes indirectly, by suppressing BAD-induced caspase-3-dependent apoptosis, in addition to directly, as we previously reported. Our study suggests that EBV-associated tumor cells might endure apoptotic stress to some extent and remain latent with the aid of miR-BART20-5p. Blocking the expression or function of BART20-5p may expedite EBV-associated tumor cell death via immune attack and apoptosis.
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147
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EBV-miR-BHRF1-2 targets PRDM1/Blimp1: potential role in EBV lymphomagenesis. Leukemia 2015; 30:594-604. [PMID: 26530011 PMCID: PMC4777778 DOI: 10.1038/leu.2015.285] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 09/04/2015] [Accepted: 09/28/2015] [Indexed: 12/12/2022]
Abstract
PRDM1/Blimp1, a master regulator of B-cell terminal differentiation, has been identified as a tumor suppressor gene in aggressive lymphomas, including diffuse large B-cell lymphoma (DLBCL). It has been shown in DLBCL and Hodgkin lymphoma that PRDM1 is downregulated by cellular microRNAs. In this study, we identify the Epstein–Barr virus (EBV) microRNA (miRNA), EBV-miR-BHRF1-2, as a viral miRNA regulator of PRDM1. EBV-miR-BHRF1-2 repressed luciferase reporter activity by specific interaction with the seed region within the PRDM1 3' untranslated region. EBV-miR-BHRF1-2 inhibition upregulated PRDM1 protein expression in lymphoblastoid cell lines (LCL), supporting a role of miR-BHRF1-2 in PRDM1 downregulation in vivo. Discordance of PRDM1 messenger RNA and protein expressions is associated with high EBV-miR-BHRF1-2 levels in LCLs and primary post-transplant EBV-positive DLBCL. Enforced expression of PRDM1-induced apoptosis and cell cycle arrest in LCL cells. Inhibition of EBV-miR-BHRF1-2 negatively regulates cell cycle and decreases expression of SCARNA20, a small nucleolar RNA that is also downregulated by PRDM1 overexpression. The interaction between EBV-miR-BHRF1-2 and PRDM1 may be one of the mechanisms by which EBV-miR-BHRF1-2 promotes EBV lymphomagenesis. Our results support the potential of EBV-miR-BHRF1-2 as a therapeutic target in EBV-associated lymphoma.
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148
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Guo C, Cui H, Ni S, Yan Y, Qin Q. Comprehensive identification and profiling of host miRNAs in response to Singapore grouper iridovirus (SGIV) infection in grouper (Epinephelus coioides). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2015; 52:226-235. [PMID: 26027797 DOI: 10.1016/j.dci.2015.05.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 05/25/2015] [Accepted: 05/26/2015] [Indexed: 06/04/2023]
Abstract
microRNAs (miRNAs) are an evolutionarily conserved class of non-coding RNA molecules that participate in various biological processes. Employment of high-throughput screening strategies greatly prompts the investigation and profiling of miRNAs in diverse species. In recent years, grouper (Epinephelus spp.) aquaculture was severely affected by iridoviral diseases. However, knowledge regarding the host immune responses to viral infection, especially the miRNA-mediated immune regulatory roles, is rather limited. In this study, by employing Solexa deep sequencing approach, we identified 116 grouper miRNAs from grouper spleen-derived cells (GS). As expected, these miRNAs shared high sequence similarity with miRNAs identified in zebrafish (Danio rerio), pufferfish (Fugu rubripes), and other higher vertebrates. In the process of Singapore grouper iridovirus (SGIV) infection, 45 and 43 miRNAs with altered expression (>1.5-fold) were identified by miRNA microarray assays in grouper spleen tissues and GS cells, respectively. Furthermore, target prediction revealed 189 putative targets of these grouper miRNAs.
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Affiliation(s)
- Chuanyu Guo
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Huachun Cui
- Department of Medicine, University of Alabama at Birmingham, 901 19th Street South, Birmingham, AL 35294, USA
| | - Songwei Ni
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yang Yan
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
| | - Qiwei Qin
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
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149
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Modulation of MicroRNA Cluster miR-183-96-182 Expression by Epstein-Barr Virus Latent Membrane Protein 1. J Virol 2015; 89:12178-88. [PMID: 26401047 DOI: 10.1128/jvi.01757-15] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 09/17/2015] [Indexed: 01/01/2023] Open
Abstract
UNLABELLED Epstein-Barr virus (EBV) is an oncogenic human herpesvirus involved in the pathogenesis of Burkitt's lymphoma (BL) and various other lymphoproliferative disorders. In BL, EBV protein expression is restricted to EBV nuclear antigen 1 (EBNA1), but small noncoding RNAs such as EBV-encoded small RNAs (EBERs) and microRNAs (miRNAs) can also be detected. miRNAs play major roles in crucial processes such as proliferation, differentiation, and cell death. It has recently become clear that alterations in the expression profile of miRNAs contribute to the pathogenesis of a number of malignancies. During latent infection, EBV expresses 25 viral pre-miRNAs and modulates the expression of specific cellular miRNAs, such as miR-155 and miR-146, which potentially play a role in oncogenesis. Here, we established the small-RNA expression profiles of three BL cell lines. Using large-scale sequencing coupled to Northern blotting and real-time reverse transcription-PCR (RT-PCR) analysis validation, we demonstrated the differential expression of some cellular and viral miRNAs. High-level expression of the miR-183-96-182 cluster and EBV miR-BamHI A rightward transcript (miR-BART) cluster was significantly associated with EBV type I latency. This expression was not affected by viral reactivation since transforming growth factor β1 (TGF-β1) stimulation did not significantly change the miRNA profiles. However, using several approaches, including de novo infection with a mutant virus, we present evidence that the expression of latent membrane protein 1 (LMP-1) triggered downregulation of the expression of the miR-183-96-182 cluster. We further show that this effect involves the Akt signaling pathway. IMPORTANCE In addition to expressing their own miRNAs, herpesviruses also impact the expression levels of cellular miRNAs. This regulation can be either positive or negative and usually results in the perturbation of pathways to create a cellular environment that is more "virus-friendly." For example, EBV induces the expression of miR-155, a well-characterized oncomiR, which leads to increased cell proliferation and decreased cell death. Here, we show that EBV-encoded LMP-1 is also involved in the downregulation of a cluster of three miRNAs, miR-183, -96, and -182, which are known to be also repressed in several cancers. We therefore identify yet another potential player in EBV-induced oncogenesis.
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150
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Manzano M, Forte E, Raja AN, Schipma MJ, Gottwein E. Divergent target recognition by coexpressed 5'-isomiRs of miR-142-3p and selective viral mimicry. RNA (NEW YORK, N.Y.) 2015; 21:1606-20. [PMID: 26137849 PMCID: PMC4536321 DOI: 10.1261/rna.048876.114] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 06/08/2015] [Indexed: 05/28/2023]
Abstract
Sequence heterogeneity at the ends of mature microRNAs (miRNAs) is well documented, but its effects on miRNA function are largely unexplored. Here we studied the impact of miRNA 5'-heterogeneity, which affects the seed region critical for target recognition. Using the example of miR-142-3p, an emerging regulator of the hematopoietic lineage in vertebrates, we show that naturally coexpressed 5'-variants (5'-isomiRs) can recognize largely distinct sets of binding sites. Despite this, both miR-142-3p isomiRs regulate exclusive and shared targets involved in actin dynamics. Thus, 5'-heterogeneity can substantially broaden and enhance regulation of one pathway. Other 5'-isomiRs, in contrast, recognize largely overlapping sets of binding sites. This is exemplified by two herpesviral 5'-isomiRs that selectively mimic one of the miR-142-3p 5'-isomiRs. We hypothesize that other cellular and viral 5'-isomiRs can similarly be grouped into those with divergent or convergent target repertoires, based on 5'-sequence features. Taken together, our results provide a detailed characterization of target recognition by miR-142-3p and its 5'-isomiR-specific viral mimic. We furthermore demonstrate that miRNA 5'-end variation leads to differential targeting and can thus broaden the target range of miRNAs.
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Affiliation(s)
- Mark Manzano
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA
| | - Eleonora Forte
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA
| | - Archana N Raja
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA Center for Genetic Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA
| | - Matthew J Schipma
- Center for Genetic Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA
| | - Eva Gottwein
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA
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