Early Growth Response Gene-1 Suppresses Foot-and-Mouth Disease Virus Replication by Enhancing Type I Interferon Pathway Signal Transduction.

Early Growth Response Gene-1 Suppresses Foot-and-Mouth Disease Virus Replication by Enhancing Type I Interferon Pathway Signal Transduction.
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早期生长反应基因 1 通过增强 I 型干扰素途径信号转导来抑制口蹄疫病毒复制

DOI:
10.3389/fmicb.2018.02326
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发表时间:
2018
影响因子:
5.2
通讯作者:
Zheng H
Zheng H
中科院分区:
生物学2区
文献类型:
--
作者:
Zhu Z;Du X;Li P;Zhang X;Yang F;Cao W;Tian H;Zhang K;Liu X;Zheng H

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早期生长反应基因 1 (EGR1) 是一种多功能转录因子,与病毒感染有关。在这项研究中,我们观察到口蹄疫病毒 (FMDV) 感染显着触发 EGR1 表达。 EGR1 的过表达抑制了猪细胞中的 FMDV 复制,而 EGR1 的敲低则显着促进了 FMDV 的复制。本研究使用了一种先前报道的 FMDV 突变病毒(SAP 结构域中有两个氨基酸突变),该病毒表现出很强的 I 型干扰素 (IFN) 诱导活性。我们发现 SAP 突变型 FMDV 感染比野生型 FMDV 感染诱导更高的 EGR1 表达,并且还引发比野生型 FMDV 感染更高的 IFN-β 和 IFN 刺激基因 (ISG) 表达。这意味着 EGR1 和 I 型 IFN 信号传导之间存在联系。进一步的研究表明,EGR1的过度表达导致仙台病毒(SeV)诱导的IFN刺激反应元件(ISRE)和NF-κB启动子激活。此外,EGR1 敲低细胞中 SeV 诱导的 ISG 表达受损。 EGR1 上调促进 I 型 IFN 信号激活并抑制 FMDV 和塞内卡谷病毒复制。抑制EGR1的转录活性并不影响其对FMDV的抗病毒作用。这项研究揭示了 EGR1 进化出的一种增强 I 型 IFN 信号传导并抑制 FMDV 复制的新机制。
Early growth response gene-1 (EGR1) is a multifunctional transcription factor that is implicated in viral infection. In this study, we observed that foot-and-mouth disease virus (FMDV) infection significantly triggered EGR1 expression. Overexpression of EGR1 suppressed FMDV replication in porcine cells, and knockdown of EGR1 considerably promoted FMDV replication. A previously reported FMDV mutant virus (with two amino acids mutations in SAP domain) that displays a strong type I interferon (IFN) induction activity was used in this study. We found that SAP mutant FMDV infection induced a higher expression of EGR1 than wildtype FMDV infection, and also triggered higher IFN-β and IFN-stimulated genes (ISGs) expression than wildtype FMDV infection. This implied a link between EGR1 and type I IFN signaling. Further study showed that overexpression of EGR1 resulted in Sendai virus (SeV)-induced IFN-stimulated response element (ISRE) and NF-κB promoter activation. In addition, the SeV-induced ISGs expression was impaired in EGR1 knockdown cells. EGR1 upregulation promoted type I IFN signaling activation and suppressed FMDV and Seneca Valley virus replication. Suppression of the transcriptional activity of EGR1 did not affect its antiviral effect against FMDV. This study reveals a new mechanism evolved by EGR1 to enhance type I IFN signaling and suppress FMDV replication.
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