期刊
FISH & SHELLFISH IMMUNOLOGY
卷 104, 期 -, 页码 663-672出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fsi.2020.05.066
关键词
Large yellow croaker; Poly(I:C); Antiviral response; Signaling transduction; Transcriptional regulation
资金
- National Science Fund for Distinguished Young Scholars of China [31525024]
- Key Program of National Natural Science Foundation of China [31830103]
- Scientific and Technological Innovation of Blue Granary [2018YFD0900402]
- Agriculture Research System of China [CARS-47-11]
Fish tend to rely more on their innate immunity to executing defense against viral infection by inducing antiviral gene production. However, the expression pattern and underlying mechanism of fish antiviral responses have yet to be fully defined. In the present study, an in vitro viral infection model was established by exposing head kidney-derived macrophages of large yellow croaker to virus analog, poly(I:C). Transcriptome analysis indicated that poly(I:C) appeared to induce potent antiviral activity featuring dominant interferon a3 (IFNa3) expression through activation of toll-like receptors (TLRs)/TIR-domain-containing adapter-inducing interferon-beta (TRIF) and retinoic acid-inducible gene I-like receptors (RLRs)/mitochondrial antiviral signaling protein (MAVS) pathways. Inhibition of nuclear factor kappa B (NF-kappa B) and stimulator of interferon genes (STING)/interferon regulatory factor 3 (IRF3) pathways diminished the expression of IFNa3. Mechanistically, transcription factors including p65 and IRF3 could promote expression of IRF3, and activated IRF3 alone further increased the transcriptional activity of IFNa3. We also characterized the promoter of IFNa3 with direct IRF3 binding site which was sufficient to render the transcription of IFNa3. This effect was attenuated after deletion or mutation of the IRF3 binding sites. Taken together, our findings illustrate the distinct transcriptional profiling of fish macrophages triggered by poly(I:C). Also, this work provides new insights into the molecular mechanism underpinning coordinated activation of pathogen recognition and signaling transduction in the antiviral responses of non-model fish species.
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