Analysis of Porcine RIG-I Like Receptors Revealed the Positive Regulation of RIG-I and MDA5 by LGP2.

Analysis of Porcine RIG-I Like Receptors Revealed the Positive Regulation of RIG-I and MDA5 by LGP2.
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猪 RIG-I 样受体分析揭示 LGP2 对 RIG-I 和 MDA5 的正向调节

DOI:
10.3389/fimmu.2021.609543
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发表时间:
2021
影响因子:
7.3
通讯作者:
Zhu J
Zhu J
中科院分区:
医学2区
文献类型:
--
作者:
Li S;Yang J;Zhu Y;Wang H;Ji X;Luo J;Shao Q;Xu Y;Liu X;Zheng W;Meurens F;Chen N;Zhu J

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RLRs在感知和抵抗病毒感染特别是RNA病毒感染中起着至关重要的作用。尽管对人类和小鼠的RLRs进行了广泛的研究,但对家畜RLRs缺乏系统的调查。在本研究中,我们对猪RLR成员rig - 1、MDA5和LGP2进行了表征。与人类的rig - 1和MDA5相比,猪的rig - 1和MDA5通过相似和合作的识别,对不同的dsRNA和病毒表现出相似的信号活性。在转染的猪肺泡巨噬细胞(PAMs)、基因敲除PAMs和PK-15细胞中,发现猪LGP2无信号活性,可正调控猪rig -1和MDA5。在机制上,LGP2在细胞活化时与rig - 1和MDA5相互作用,促进MDA5和rig - 1结合dsRNA配体。因此,猪LGP2具有广泛的抗病毒功能。有趣的是,我们发现具有atp酶和/或dsRNA结合缺陷的猪LGP2突变体存在可能通过rig - 1和MDA5产生的构成活性。我们的工作为猪先天免疫、物种特异性和免疫生物学提供了重要的见解。
The RLRs play critical roles in sensing and fighting viral infections especially RNA virus infections. Despite the extensive studies on RLRs in humans and mice, there is a lack of systemic investigation of livestock animal RLRs. In this study, we characterized the porcine RLR members RIG-I, MDA5 and LGP2. Compared with their human counterparts, porcine RIG-I and MDA5 exhibited similar signaling activity to distinct dsRNA and viruses, via similar and cooperative recognitions. Porcine LGP2, without signaling activity, was found to positively regulate porcine RIG-I and MDA5 in transfected porcine alveolar macrophages (PAMs), gene knockout PAMs and PK-15 cells. Mechanistically, LGP2 interacts with RIG-I and MDA5 upon cell activation, and promotes the binding of dsRNA ligand by MDA5 as well as RIG-I. Accordingly, porcine LGP2 exerted broad antiviral functions. Intriguingly, we found that porcine LGP2 mutants with defects in ATPase and/or dsRNA binding present constitutive activity which are likely through RIG-I and MDA5. Our work provided significant insights into porcine innate immunity, species specificity and immune biology.
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