2. Academic Validation
  3. Characterization of antiviral immune response induced by poly(I:C) in macrophages of farmed large yellow croaker (Larimichthys crocea)

Characterization of antiviral immune response induced by poly(I:C) in macrophages of farmed large yellow croaker (Larimichthys crocea)

  • Fish Shellfish Immunol. 2020 Sep;104:663-672. doi: 10.1016/j.fsi.2020.05.066.
Qingfei Li 1,  Mengjiao Wu 1,  Kun Cui 1,  Si Zhu 1,  Kangsen Mai 2,  Qinghui Ai 3
Affiliations

Affiliations

  • 1 Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), College of Fisheries, Ocean University of China, 5 Yushan Road, Qingdao, Shandong, 266003, People's Republic of China.
  • 2 Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), College of Fisheries, Ocean University of China, 5 Yushan Road, Qingdao, Shandong, 266003, People's Republic of China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, 1 Wenhai Road, Qingdao, Shandong, 266237, People's Republic of China.
  • 3 Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), College of Fisheries, Ocean University of China, 5 Yushan Road, Qingdao, Shandong, 266003, People's Republic of China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, 1 Wenhai Road, Qingdao, Shandong, 266237, People's Republic of China. Electronic address: qhai@ouc.edu.cn.
PMID: 32497725 DOI: 10.1016/j.fsi.2020.05.066
Abstract

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-β (TRIF) and retinoic acid-inducible gene I-like receptors (RLRs)/mitochondrial Antiviral signaling protein (MAVS) pathways. Inhibition of nuclear factor κB (NF-κB) 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.

Keywords

Antiviral response; Large yellow croaker; Poly(I:C); Signaling transduction; Transcriptional regulation.

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