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- W2000543657 abstract "Type I interferons (IFNs), predominantly IFN-α and β, play important roles in both innate and adaptive immune responses against viral infections. Porcine reproductive and respiratory syndrome virus (PRRSV) has been recognized to be able to down-regulate the IFN response during in vivo and in vitro infection. In this study, we first analyzed inhibitory effect of each NSP of low pathogenic PRRSV HB-1/3.9 on IFN-β transcription in MARC-145 cells, and the results showed that the IFN-β promoter activation could be suppressed by NSP1α, NSP2, NSP1β, NSP3, NSP4, NSP5 and NSP11. We next confirmed that the inhibitory effect of NSP4 was mainly mediated through suppressing NF-κB activation, whereas not hindering NF-κB phosphorylation and nuclear translocation, and nuclear-localized NSP4 was responsible for inhibiting IFN-β activation. We further found that the NSP4 of different pathogenic PRRSV strains exhibited differential inhibitory effect on IFN-β, NF-κB, and IRF3 transcription, and the NSP4 of highly pathogenic (HP)-PRRSV could display more strong inhibitory effect. Finally, we determined that the amino acid at residue 155 in NSP4 contributed to its inhibitory effect for IFN-β transcription in vitro by altering its subcellular distribution. Our findings suggest that the nucleus-localized NSP4 of PRRSV participates in the modulation of the host type I IFNs system, and also provide novel insight for understanding the pathogenesis of the Chinese HP-PRRSV." @default.
- W2000543657 created "2016-06-24" @default.
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- W2000543657 date "2014-08-01" @default.
- W2000543657 modified "2023-09-23" @default.
- W2000543657 title "The amino acid at residue 155 in nonstructural protein 4 of porcine reproductive and respiratory syndrome virus contributes to its inhibitory effect for interferon-β transcription in vitro" @default.
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- W2000543657 doi "https://doi.org/10.1016/j.virusres.2014.05.027" @default.
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