Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (8): 1923-1931.doi: 10.11843/j.issn.0366-6964.2020.08.016

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Foot-and-Mouth Disease Virus 3D Protein Positively Regulates the Production of InterferonⅠMediated by TLR3

LI Lulu, ZHANG Jing, LI Dan*, ZHENG Haixue*   

  1. State Key Laboratory of Veterinary Etiological Biology and OIE/National Foot and Mouth Disease Reference Laboratory, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
  • Received:2020-01-10 Online:2020-08-25 Published:2020-08-19

Abstract: Foot-and-mouth disease (FMD) caused by FMD virus (FMDV) is an acute, hot and highly contagious disease. FMDV causes a series of severe inflammatory response, and TLR3 pathway is one of the major cellular inflammatory. In order to study the effect of FMDV protein on TLR3 pathway, we screened the FMDV proteins affecting on TLR3 pathway by reporter assays. Then candidate protein effect on transcription of TLR3 pathway downstream genes was verified by Q-PCR assay. TLR3 signaling pathway proteins interacted with candidate protein was further verified by co-immunocoprecipitation. Finally, we detected phosphorylation level of TLR3 pathway downstream proteins in candidate protein-overexpressed 293-TLR3 cells by Western blot. The luciferase assays and Q-PCR results showed that FMDV 3D potentiated poly (I:C)-triggered TLR3 signaling pathway and transcription of TLR3 pathway downstream genes, respectively. In addition, co-immunocoprecipitation showed that FMDV 3D interacted with TLR3. Furthermore, FMDV 3D increased the phosphorylation level of TLR3 pathway downstream protein. In conclusion, FMDV 3D potentiated type Ⅰ interferon mediated by TLR3 pathway, which regulate innate immune response.

Key words: FMDV, innate immune, TLR3, 3D protein

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