数字农科院2.0

Peste Des Petits Ruminants Virus N Protein Is a Critical Proinflammation Factor That Promotes MyD88 and NLRP3 Complex Assembly

文献类型： 外文期刊

作者： Li, Lingxia;Yang, Wenping;Ma, Xiaoxia;Wu, Jinyan;Qin, Xiaodong;Cao, Xiaoan;Zhou, Jianhua;Jin, Li;He, Jijun;Zheng, Haixue;Liu, Xiangtao;Li, Dan;Shang, Youjun

作者机构：

关键词： PPRV;NLRP3 inflammasome;N protein;NF-kappa B;IL-1 beta

期刊名称： JOURNAL OF VIROLOGY

ISSN： 0022-538X

年卷期： 2022 年

页码：

收录情况： SCIE（2022版）

摘要： Inflammatory responses play a central role in host defense against invading pathogens. Peste des petits ruminants virus (PPRV) causes highly contagious acute or subacute disease of small ruminants. However, the precise mechanism by which PPRV regulates inflammatory responses remains unknown. Here, we revealed a novel mechanism by which PPRV induces inflammation. Our study showed that PPRV induced the secretion of interleukin 1 beta (IL-1 beta) by activating the NF-kappa B signaling pathway and the NLRP3 inflammasome. Moreover, PPRV replication and protein synthesis were essential for NLRP3 inflammasome activation. Importantly, PPRV N protein promoted NF-kappa B signaling pathway and NLRP3 inflammasome via direct binding of MyD88 and NLPR3, respectively, and induced caspase-1 cleavage and IL-1 beta maturation. Biochemically, N protein interacted with MyD88 to potentiate the assembly of MyD88 complex and interacted with NLPR3 to facilitate NLRP3 inflammasome complex assembly by forming an N-NLRP3-ASC ring-like structure, leading to IL-1 beta secretion. These findings demonstrate a new function of PPRV N protein as an important proinflammation factor and identify a novel underlying mechanism modulating inflammasome assembly and function induced by PPRV. IMPORTANCE An important part of the innate immune response is the activation of NF-kappa B signaling pathway and NLPR3 inflammasome, which is induced upon exposure to pathogens. Peste des petits ruminants virus (PPRV) is a highly contagious virus causing fever, stomatitis, and pneumoenteritis in goats by inducing many proinflammatory cytokines. Although the NF-kappa B signaling pathway and NLRP3 inflammasome play an important role in regulating host immunity and viral infection, the precise mechanism by which PPRV regulates inflammatory responses remains unknown. This study demonstrates that PPRV induces inflammatory responses. Mechanistically, PPRV N protein facilitates the MyD88 complex assembly by directly binding to MyD88 and promotes the NLRP3 inflammasome complex assembly by directly binding to NLRP3 to form ring-like structures of N-NLRP3-ASC. These findings provide insights into the prevention and treatment of PPRV infection.

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