Porcine RIG-I and MDA5 Signaling CARD Domains Exert Similar Antiviral Function Against Different Viruses.

Porcine RIG-I and MDA5 Signaling CARD Domains Exert Similar Antiviral Function Against Different Viruses.
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猪 RIG-I 和 MDA5 信号传导 CARD 结构域对不同病毒发挥相似的抗病毒功能

DOI:
10.3389/fmicb.2021.677634
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发表时间:
2021
影响因子:
5.2
通讯作者:
Zhu J
Zhu J
中科院分区:
生物学2区
文献类型:
--
作者:
Li S;Shao Q;Zhu Y;Ji X;Luo J;Xu Y;Liu X;Zheng W;Chen N;Meurens F;Zhu J

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RIG-I样受体(RLR)RIG-I和MDA 5在感知和对抗病毒感染中起关键作用。虽然RIG-I和MDA 5具有相似的分子结构,但这两种受体在活化过程中具有不同的特征。此外,RIG-I和MDA 5中的N末端CARD结构域(CARD)的信号传导结构域具有差的相似性。因此,我们想知道RIG-I和MDA 5的CARD是否在信号传导和抗病毒功能中发挥相似的作用。在此,我们在293 T细胞和猪肺泡巨噬细胞中表达了猪RIG-I和MDA 5 CARD,并发现MDA 5 CARD比RIG-I CARD表现出更高的表达和更强的信号传导活性。然而,RIG-I和MDA 5 CARD都对几种病毒发挥相当的抗病毒功能。转录组分析表明,MDA 5 CARD在调节下游基因方面更有效。然而,在病毒存在下,RIG-I和MDA 5 CARD对下游基因转录的影响相似,反映了它们的抗病毒功能。
The RIG-I-like receptors (RLRs) RIG-I and MDA5 play critical roles in sensing and fighting viral infections. Although RIG-I and MDA5 have similar molecular structures, these two receptors have distinct features during activation. Further, the signaling domains of the N terminal CARD domains (CARDs) in RIG-I and MDA5 share poor similarity. Therefore, we wonder whether the CARDs of RIG-I and MDA5 play similar roles in signaling and antiviral function. Here we expressed porcine RIG-I and MDA5 CARDs in 293T cells and porcine alveolar macrophages and found that MDA5 CARDs exhibit higher expression and stronger signaling activity than RIG-I CARDs. Nevertheless, both RIG-I and MDA5 CARDs exert comparable antiviral function against several viruses. Transcriptome analysis showed that MDA5 CARDs are more effective in regulating downstream genes. However, in the presence of virus, both RIG-I and MDA5 CARDs exhibit similar effects on downstream gene transcriptions, reflecting their antiviral function.
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