CD97 negatively regulates the innate immune response against RNA viruses by promoting RNF125-mediated RIG-I degradation  

作　　者：Huasong Chang Peili Hou Xuefeng Wang Aibiao Xiang Hao Wu Wenjing Qi Rukun Yang Xue Wang Xingyu Li Wenqi He Guimin Zhao Weiyang Sun Tiecheng Wang Daniel Chang He Hongmei Wang Yuwei Gao Hongbin He 

机构地区：[1]Ruminant Diseases Research Center,College of Life Sciences,Shandong Normal University,Jinan,Shandong,250014,China [2]Department of Preventive Veterinary Medicine,College of Veterinary Medicine,Shandong Agricultural University,Taian,Shandong,271018,China [3]Changchun Veterinary Research Institute,Chinese Academy of Agricultural Sciences,Changchun,Jilin,130122,China [4]Key Laboratory of Zoonosis Research,Ministry of Education,College of Veterinary Medicine,Jilin University,Changchun,Jilin,130062,China [5]The College of Arts and Sciences,University of North Carolina at Chapel Hill,Chapel Hill,NC,27599,USA

出　　处：《Cellular & Molecular Immunology》2023年第12期1457-1471,共15页中国免疫学杂志（英文版）

基　　金：supported by grants from the National Natural Science Fund of China(32072834,31972665);Special fund support for Taishan Scholar Project(H.H,tspd20181207);Shandong Provincial Natural Science Foundation,China(ZR2021MC050),and Jinan Innovation Team(202228060).

摘　　要：The G protein-coupled receptor ADGRE5(CD97)binds to various metabolites that play crucial regulatory roles in metabolism.However,its function in the antiviral innate immune response remains to be determined.In this study,we report that CD97 inhibits virus-induced type-I interferon(IFN-I)release and enhances RNA virus replication in cells and mice.CD97 was identified as a new negative regulator of the innate immune receptor RIG-I,and RIG-1 degradation led to the suppression of the IFN-I signaling pathway.Furthermore,overexpression of CD97 promoted the ubiquitination of RIG-I,resulting in its degradation,but did not impact its mRNA expression.Mechanistically,CD97 upregulates RNF125 expression to induce RNF125-mediated RIG-I degradation via K48-linked ubiquitination at Lys181 after RNA virus infection.Most importantly,CD97-deficient mice are more resistant than wild-type mice to RNA virus infection.We also found that sanguinarine-mediated inhibition of CD97 effectively blocks VSV and SARS-CoV-2 replication.These findings elucidate a previously unknown mechanism through which CD97 negatively regulates RIG-I in the antiviral innate immune response and provide a molecular basis for the development of new therapeutic strategies and the design of targeted antiviral agents.

关 键 词：CD97 RNA virus IFN-l UBIQUITINATION RIG-1 

分 类 号：R392[医药卫生—免疫学]