Actin cytoskeleton remodeling primes RIG-I-like receptor activation.

Actin cytoskeleton remodeling primes RIG-I-like receptor activation.
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DOI:
10.1016/j.cell.2022.08.011
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发表时间:
2022-09-15
期刊:
影响因子:
64.5
通讯作者:
Gack, Michaela U.
Gack, Michaela U.
中科院分区:
生物学1区
文献类型:
--
作者:
Acharya, Dhiraj;Reis, Rebecca;Volcic, Meta;Liu, GuanQun;Wang, May K.;Chia, Bing Shao;Nchioua, Rayhane;Gross, Rudiger;Munch, Jan;Kirchhoff, Frank;Sparrer, Konstantin M. J.;Gack, Michaela U.

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The current dogma of RNA-mediated innate immunity is that sensing of immunostimulatory RNA ligands is sufficient for the activation of intracellular sensors and induction of interferon (IFN) responses. Here, we report that actin cytoskeleton disturbance primes RIG-I-like receptor (RLR) activation. Actin cytoskeleton rearrangement induced by virus infection or commonly used reagents to intracellularly deliver RNA triggers the relocalization of PPP1R12C, a regulatory subunit of the protein phosphatase-1 (PP1), from filamentous actin to cytoplasmic RLRs. This allows dephosphorylation-mediated RLR priming and, together with the RNA agonist, induces effective RLR downstream signaling. Genetic ablation of PPP1R12C impairs antiviral responses and enhances susceptibility to infection with several RNA viruses including SARS-CoV-2, influenza virus, picornavirus, and vesicular stomatitis virus. Our work identifies actin cytoskeleton disturbance as a priming signal for RLR-mediated innate immunity, which may open avenues for antiviral or adjuvant design. Disturbances to the actin cytoskeleton during infection of a cell by an RNA virus drive a specific phosphatase complex to prime RIG-I-like receptors to sense viral RNA, thus promoting effective antiviral responses.
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