SARS-CoV-2 ORF3a positively regulates NF-κB activity by enhancing IKKβ-NEMO interaction.

SARS-CoV-2 ORF3a positively regulates NF-κB activity by enhancing IKKβ-NEMO interaction.
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DOI:
10.1016/j.virusres.2023.199086
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发表时间:
2023-04-15
期刊:
影响因子:
5
通讯作者:
Wu J
Wu J
中科院分区:
医学3区
文献类型:
--
作者:
Nie Y;Mou L;Long Q;Deng D;Hu R;Cheng J;Wu J

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本研究通过荧光素酶报告基因分析筛选了20个SARS-CoV-2基因,并鉴定出ORF 3a是NF-κB通路的激活因子。ORF 3a在IκBα的上游水平诱导促炎细胞因子。ORF 3a与IKK b和NEMO相互作用,并增强IKKβ-NEMO的缔合。2019冠状病毒病(COVID-19)是由SARS-CoV-2感染引起的全球大流行病。重症COVID-19患者表现出强烈的促炎细胞因子诱导,这与急性呼吸窘迫综合征的发生密切相关。然而,SARS-CoV-2感染介导的NF-κB活化的潜在机制仍然知之甚少。在这里,我们筛选SARS-CoV-2基因,发现ORF 3a通过激活NF-κB通路诱导促炎细胞因子。ORF 3a与IKKβ和NEMO相互作用,增强IKKβ-NEMO相互作用,从而正向调节NF-κB活性。总之,这些结果表明ORF 3a可能在SARS-CoV-2的发病机制中发挥关键作用,并为宿主免疫反应和SARS-CoV-2感染之间的相互作用提供了新的见解。
This study screened twenty SARS-CoV-2 genes by luciferase reporter assay and identified ORF3a as an activator of NF-κB pathway. ORF3a induces proinflammatory cytokines in the upstream level of IκBα. ORF3a interacts with IKKb and NEMO and enhances the association of IKKβ-NEMO. Coronavirus disease 2019 (COVID-19) is a global pandemic caused by SARS-CoV-2 infection. Patients with severe COVID-19 exhibit robust induction of proinflammatory cytokines, which are closely associated with the development of acute respiratory distress syndrome. However, the underlying mechanisms of the NF-κB activation mediated by SARS-CoV-2 infection remain poorly understood. Here, we screened SARS-CoV-2 genes and found that ORF3a induces proinflammatory cytokines by activating the NF-κB pathway. Moreover, we found that ORF3a interacts with IKKβ and NEMO and enhances the interaction of IKKβ-NEMO, thereby positively regulating NF-κB activity. Together, these results suggest ORF3a may play pivotal roles in the pathogenesis of SARS-CoV-2 and provide novel insights into the interaction between host immune responses and SARS-CoV-2 infection.
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