Short-range exosomal transfer of viral RNA from infected cells to plasmacytoid dendritic cells triggers innate immunity.

Short-range exosomal transfer of viral RNA from infected cells to plasmacytoid dendritic cells triggers innate immunity.
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DOI:
10.1016/j.chom.2012.08.010
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发表时间:
2012-10-18
影响因子:
30.3
通讯作者:
Chisari FV
Chisari FV
中科院分区:
医学1区
文献类型:
--
作者:
Dreux M;Garaigorta U;Boyd B;Décembre E;Chung J;Whitten-Bauer C;Wieland S;Chisari FV

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Viral nucleic acids often trigger an innate immune response in infected cells. Many viruses, including hepatitis C virus (HCV), have evolved mechanisms to evade intracellular recognition. Nevertheless, HCV-permissive cells can trigger a viral RNA-, TLR7- and cell contact-dependent compensatory interferon response in nonpermissive plasmacytoid dendritic cells (pDCs). Here we report that these events are mediated by transfer of HCV RNA-containing exosomes from infected cells to pDCs. The exosomal viral RNA transfer is dependent on the endosomal sorting complex (ESCRT) machinery and on Annexin A2, an RNA-binding protein involved in membrane vesicle trafficking, and it is suppressed by exosome release inhibitors. Further, purified concentrated HCV RNA-containing exosomes are sufficient to activate pDCs. Thus, vesicular sequestration and exosomal export of viral RNA may serve both as a viral strategy to evade pathogen-sensing within infected cells and as a host strategy to induce an unopposed innate response in replication-nonpermissive by-stander cells.
DOI: 10.1038/nrm2937
发表时间: 2010-08
期刊: Nature reviews. Molecular cell biology
影响因子: --
作者:
通讯作者: --
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