Sensing of latent EBV infection through exosomal transfer of 5'pppRNA

Complex interactions between DNA herpesviruses and host factors determine the establishment of a life-long asymptomatic latent infection. The lymphotropic Epstein-Barr virus (EBV) seems to avoid recognition by innate sensors despite massive transcription of immunostimulatory small RNAs (EBV-EBERs)....

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2016-02, Vol.113 (5), p.E587-E596
Hauptverfasser: Baglio, S Rubina, van Eijndhoven, Monique A J, Koppers-Lalic, Danijela, Berenguer, Jordi, Lougheed, Sinéad M, Gibbs, Susan, Léveillé, Nicolas, Rinkel, Rico N P M, Hopmans, Erik S, Swaminathan, Sankar, Verkuijlen, Sandra A W M, Scheffer, George L, van Kuppeveld, Frank J M, de Gruijl, Tanja D, Bultink, Irene E M, Jordanova, Ekaterina S, Hackenberg, Michael, Piersma, Sander R, Knol, Jaco C, Voskuyl, Alexandre E, Wurdinger, Thomas, Jiménez, Connie R, Middeldorp, Jaap M, Pegtel, D Michiel
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container_end_page E596
container_issue 5
container_start_page E587
container_title Proceedings of the National Academy of Sciences - PNAS
container_volume 113
creator Baglio, S Rubina
van Eijndhoven, Monique A J
Koppers-Lalic, Danijela
Berenguer, Jordi
Lougheed, Sinéad M
Gibbs, Susan
Léveillé, Nicolas
Rinkel, Rico N P M
Hopmans, Erik S
Swaminathan, Sankar
Verkuijlen, Sandra A W M
Scheffer, George L
van Kuppeveld, Frank J M
de Gruijl, Tanja D
Bultink, Irene E M
Jordanova, Ekaterina S
Hackenberg, Michael
Piersma, Sander R
Knol, Jaco C
Voskuyl, Alexandre E
Wurdinger, Thomas
Jiménez, Connie R
Middeldorp, Jaap M
Pegtel, D Michiel
description Complex interactions between DNA herpesviruses and host factors determine the establishment of a life-long asymptomatic latent infection. The lymphotropic Epstein-Barr virus (EBV) seems to avoid recognition by innate sensors despite massive transcription of immunostimulatory small RNAs (EBV-EBERs). Here we demonstrate that in latently infected B cells, EBER1 transcripts interact with the lupus antigen (La) ribonucleoprotein, avoiding cytoplasmic RNA sensors. However, in coculture experiments we observed that latent-infected cells trigger antiviral immunity in dendritic cells (DCs) through selective release and transfer of RNA via exosomes. In ex vivo tonsillar cultures, we observed that EBER1-loaded exosomes are preferentially captured and internalized by human plasmacytoid DCs (pDCs) that express the TIM1 phosphatidylserine receptor, a known viral- and exosomal target. Using an EBER-deficient EBV strain, enzymatic removal of 5'ppp, in vitro transcripts, and coculture experiments, we established that 5'pppEBER1 transfer via exosomes drives antiviral immunity in nonpermissive DCs. Lupus erythematosus patients suffer from elevated EBV load and activated antiviral immunity, in particular in skin lesions that are infiltrated with pDCs. We detected high levels of EBER1 RNA in such skin lesions, as well as EBV-microRNAs, but no intact EBV-DNA, linking non-cell-autonomous EBER1 presence with skin inflammation in predisposed individuals. Collectively, our studies indicate that virus-modified exosomes have a physiological role in the host-pathogen stand-off and may promote inflammatory disease.
doi_str_mv 10.1073/pnas.1518130113
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The lymphotropic Epstein-Barr virus (EBV) seems to avoid recognition by innate sensors despite massive transcription of immunostimulatory small RNAs (EBV-EBERs). Here we demonstrate that in latently infected B cells, EBER1 transcripts interact with the lupus antigen (La) ribonucleoprotein, avoiding cytoplasmic RNA sensors. However, in coculture experiments we observed that latent-infected cells trigger antiviral immunity in dendritic cells (DCs) through selective release and transfer of RNA via exosomes. In ex vivo tonsillar cultures, we observed that EBER1-loaded exosomes are preferentially captured and internalized by human plasmacytoid DCs (pDCs) that express the TIM1 phosphatidylserine receptor, a known viral- and exosomal target. Using an EBER-deficient EBV strain, enzymatic removal of 5'ppp, in vitro transcripts, and coculture experiments, we established that 5'pppEBER1 transfer via exosomes drives antiviral immunity in nonpermissive DCs. Lupus erythematosus patients suffer from elevated EBV load and activated antiviral immunity, in particular in skin lesions that are infiltrated with pDCs. We detected high levels of EBER1 RNA in such skin lesions, as well as EBV-microRNAs, but no intact EBV-DNA, linking non-cell-autonomous EBER1 presence with skin inflammation in predisposed individuals. 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source Jstor Complete Legacy; MEDLINE; PubMed Central; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry
subjects Biological Transport
Biosensors
Cellular biology
Dendritic Cells - virology
Deoxyribonucleic acid
DNA
Epstein-Barr virus
Epstein-Barr Virus Infections - genetics
Epstein-Barr Virus Infections - immunology
Exosomes - metabolism
Experiments
Herpes viruses
Herpesvirus 4, Human - genetics
Humans
Proteome
RNA, Viral - metabolism
Viral infections
title Sensing of latent EBV infection through exosomal transfer of 5'pppRNA
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