A dual-role of SARS-CoV-2 nucleocapsid protein in regulating innate immune response.

A dual-role of SARS-CoV-2 nucleocapsid protein in regulating innate immune response.
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SARS-CoV-2 核衣壳蛋白在调节先天免疫反应中的双重作用

DOI:
10.1038/s41392-021-00742-w
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发表时间:
2021-09-01
影响因子:
39.3
通讯作者:
Wang G
Wang G
中科院分区:
医学1区
文献类型:
--
作者:
Zhao Y;Sui L;Wu P;Wang W;Wang Z;Yu Y;Hou Z;Tan G;Liu Q;Wang G

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新出现的严重急性呼吸综合征冠状病毒2型(SARS-CoV-2)是目前正在进行的COVID-19全球大流行的病原体,可能引发感染早期的免疫抑制和后期的过度免疫反应;然而,其潜在机制尚不清楚。在这里,我们证明了SARS-CoV-2核衣壳蛋白(N)双重调节先天免疫反应,即低剂量N蛋白抑制I型干扰素(IFN-I)信号传导和炎症因子,而高剂量N蛋白促进IFN-I信号传导和炎症因子。在机制上,sars - cov - 2n蛋白双重调控IRF3、STAT1和STAT2的磷酸化和核易位。此外,低剂量N蛋白与TRIM25联合可抑制维甲酸诱导基因I (RIG-I)的泛素化和活化。我们的研究结果揭示了SARS-CoV-2 N蛋白对先天免疫反应的调控机制,这将有助于了解SARS-CoV-2和其他sars样冠状病毒的发病机制,并有助于制定更有效的控制COVID-19的策略。
The recently emerged severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which is the causative agent of ongoing global pandemic of COVID-19, may trigger immunosuppression in the early stage and overactive immune response in the late stage of infection; However, the underlying mechanisms are not well understood. Here we demonstrated that the SARS-CoV-2 nucleocapsid (N) protein dually regulated innate immune responses, i.e., the low-dose N protein suppressed type I interferon (IFN-I) signaling and inflammatory cytokines, whereas high-dose N protein promoted IFN-I signaling and inflammatory cytokines. Mechanistically, the SARS-CoV-2 N protein dually regulated the phosphorylation and nuclear translocation of IRF3, STAT1, and STAT2. Additionally, low-dose N protein combined with TRIM25 could suppress the ubiquitination and activation of retinoic acid-inducible gene I (RIG-I). Our findings revealed a regulatory mechanism of innate immune responses by the SARS-CoV-2 N protein, which would contribute to understanding the pathogenesis of SARS-CoV-2 and other SARS-like coronaviruses, and development of more effective strategies for controlling COVID-19.
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