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Hu L, Xu Y, Zhang QS, Chen XY, Li C, Chen R, Hou GL, Lv Z, Xiao TY, Zou J, Wang HQ, Li JH. IL-6/STAT3 axis is hijacked by GCRV to facilitate viral replication via suppressing type Ⅰ IFN signaling. Fish Shellfish Immunol 2024; 149:109564. [PMID: 38631439 DOI: 10.1016/j.fsi.2024.109564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 04/10/2024] [Accepted: 04/14/2024] [Indexed: 04/19/2024]
Abstract
Grass carp reovirus (GCRV) infections and hemorrhagic disease (GCHD) outbreaks are typically seasonally periodic and temperature-dependent, yet the molecular mechanism remains unclear. Herein, we depicted that temperature-dependent IL-6/STAT3 axis was exploited by GCRV to facilitate viral replication via suppressing type Ⅰ IFN signaling. Combined multi-omics analysis and qPCR identified IL-6, STAT3, and IRF3 as potential effector molecules mediating GCRV infection. Deploying GCRV challenge at 18 °C and 28 °C as models of resistant and permissive infections and switched to the corresponding temperatures as temperature stress models, we illustrated that IL-6 and STAT3 expression, genome level of GCRV, and phosphorylation of STAT3 were temperature dependent and regulated by temperature stress. Further research revealed that activating IL-6/STAT3 axis enhanced GCRV replication and suppressed the expression of IFNs, whereas blocking the axis impaired viral replication. Mechanistically, grass carp STAT3 inhibited IRF3 nuclear translocation via interacting with it, thus down-regulating IFNs expression, restraining transcriptional activation of the IFN promoter, and facilitating GCRV replication. Overall, our work sheds light on an immune evasion mechanism whereby GCRV facilitates viral replication by hijacking IL-6/STAT3 axis to down-regulate IFNs expression, thus providing a valuable reference for targeted prevention and therapy of GCRV.
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Affiliation(s)
- Liang Hu
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China
| | - Yang Xu
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China
| | - Qiu-Shi Zhang
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China
| | - Xiao-Ying Chen
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China
| | - Chun Li
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China
| | - Rui Chen
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China
| | - Guo-Li Hou
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China
| | - Zhao Lv
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China
| | - Tiao-Yi Xiao
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China
| | - Jun Zou
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai, 201306, China
| | - Hong-Quan Wang
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China.
| | - Jun-Hua Li
- College of Fisheries, Hunan Agricultural University, Changsha, 410128, China.
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