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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Vet+Microbiol 2021 ; 252 (ä): 108918 Nephropedia Template TP
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Porcine haemagglutinating encephalomyelitis virus deactivates transcription factor IRF3 and limits type I interferon production #MMPMID33191000
Li Z; Yang Y; Lu H; Zhang J; Xu R; Shi J; Lan Y; Guan J; Zhao K; He H; Gao F; He W
Vet Microbiol 2021[Jan]; 252 (ä): 108918 PMID33191000show ga
Porcine haemagglutinating encephalomyelitis virus (PHEV) is a member of coronavirus that causes acute infectious disease and high mortality in piglets. The transcription factor IRF3 is a central regulator of type I interferon (IFN) innate immune signalling. Here, we report that PHEV infection of RAW264.7 cells results in strong suppression of IFN-beta production in the early stage. A comparative analysis of the upstream effector of IFN-beta transcription demonstrated that deactivation of IRF3, but not p65 or ATF-2 proteins, is uniquely attributed to failure of early IFN-beta induction. Moreover, the RIG-I/MDA5/MAVS/TBK1-dependent protective response that regulates the IRF3 pathway is not disrupted by PHEV and works well underlying the deactivated IRF3-mediated IFN-beta inhibition. After challenge with poly(I:C), a synthetic analogue of dsRNA used to stimulate IFN-beta secretion in the TLR-controlled pathway, we show that PHEV and poly(I:C) regulate IFN-beta-induction via two different pathways. Collectively, our findings reveal that deactivation of IRF3 is a specific mechanism that contributes to termination of type I IFN signalling during early infection with PHEV independent of the conserved RIG-I/MAVS/MDA5/TBK1-mediated innate immune response.