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Recognition of RNA virus by RIG-I results in activation of CARD9 and inflammasome signaling for interleukin 1β production

An Addendum to this article was published on 18 December 2013

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Abstract

Interleukin 1β (IL-1β) is a potent proinflammatory factor during viral infection. Its production is tightly controlled by transcription of Il1b dependent on the transcription factor NF-κB and subsequent processing of pro-IL-1β by an inflammasome. However, the sensors and mechanisms that facilitate RNA virus–induced production of IL-1β are not well defined. Here we report a dual role for the RNA helicase RIG-I in RNA virus–induced proinflammatory responses. Whereas RIG-I-mediated activation of NF-κB required the signaling adaptor MAVS and a complex of the adaptors CARD9 and Bcl-10, RIG-I also bound to the adaptor ASC to trigger caspase-1-dependent inflammasome activation by a mechanism independent of MAVS, CARD9 and the Nod-like receptor protein NLRP3. Our results identify the CARD9–Bcl-10 module as an essential component of the RIG-I-dependent proinflammatory response and establish RIG-I as a sensor able to activate the inflammasome in response to certain RNA viruses.

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Figure 1: RIG-I signaling is required and sufficient for IL-1β production after infection with an RNA virus.
Figure 2: RIG-I controls IL-1β production and caspase-1 activation after detecting RNA viruses.
Figure 3: MAVS and CARD9 are essential for RIG-I-induced production of IL-1β but are dispensable for inflammasome activation.
Figure 4: MAVS, CARD9 and Bcl-10 control pro-IL-1β production after RIG-I ligation.
Figure 5: RIG-I engages ASC to induce inflammasome activation.
Figure 6: RIG-I-induced inflammasome activation is independent of NLRP3.
Figure 7: Mda5 requires NLRP3 for inflammasome activation.

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Change history

  • 15 May 2013

    In 2010 we reported in Nature Immunology how the sensing of cytosolic RNA triggers the generation of mature interleukin 1β (IL-1β; Poeck et al., Nat. Immunol. 11, 63–69 (2010)). We demonstrated that ligation of the RNA helicase RIG-I triggered the adaptor CARD9 downstream of the signaling adaptor MAVS (IPS-1) to induce the transcription factor NF-κB for the generation of pro-IL-1β and in parallel activated caspase-1 for the generation of mature IL-1β. We presented data that indicated similar generation of pro-IL-1β and IL-1β in wild-type bone marrow–derived dendritic cells (BMDCs) and BMDCs deficient in CARD9 or the adaptor Bcl-10 after transfection of the synthetic DNA poly(dA:dT) (Fig. 3c (right) and Fig. 4c,e,f). However, additional experiments in our laboratory have shown that CARD9- or Bcl-10-deficient BMDCs have impaired production of pro-IL-1β and IL-1β not only after sensing of RNA but also after the transfection of poly(dA:dT). We speculate that a particular aliquot of poly(dA:dT) used during the preparation of our study published in 2010 might have been contaminated with lipopolysaccharide or some other CARD9-independent trigger of the innate immune system. Still, the central conclusions of that manuscript (that RIG-I signals via CARD9 and the inflammasome to control IL-1β) remain unchanged and have been confirmed by multiple independent laboratories. Nevertheless, we would like to correct the idea that CARD9- or Bcl-10-deficient cells have normal IL-1β responses to the transfection of poly(dA:dT).

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Acknowledgements

We thank J. Tschopp (University of Lausanne) for critical reading of the manuscript, discussions and NLRP3-deficient, ASC-deficient and MAVS-deficient mice and plasmids; and A. Krug (Technical University of Munich) for EMCV. This work includes parts of a thesis by M.B. at the University of Munich. Supported by Bundesministerium für Bildung und Forschung Biofuture (G.H.), Deutsche Forschungsgemeinschaft (SFB704, SFB670, SFB832 and KFO177 to G.H.; Sonderforschungsbereiche to S.E., V.H. and J.R.; Graduiertenkolleg 1202 to M.B.; and RO 2525/3–1 to S.R.), the Center for Integrated Protein Science Munich (S.E.), the European Research Council (V.H.) and Deutsche Krebshilfe (J.R.).

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H.P., M.B., O.G., G.H., V.H. and J.R. designed the research; H.P., M.B., O.G., K.F., S.R., N.H., M.R. and M.S. did experiments; W.B., H.K., S.A. and S.I. contributed critical reagents; H.P., M.B., O.G., S.R., S.E., C.P., V.H., G.H. and J.R. analyzed results; H.P. and M.B. prepared the figures; and H.P., M.B., O.G., G.H. and J.R. wrote the paper.

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Correspondence to Jürgen Ruland.

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Poeck, H., Bscheider, M., Gross, O. et al. Recognition of RNA virus by RIG-I results in activation of CARD9 and inflammasome signaling for interleukin 1β production. Nat Immunol 11, 63–69 (2010). https://doi.org/10.1038/ni.1824

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