Porcine IFI16 Negatively Regulates cGAS Signaling Through the Restriction of DNA Binding and Stimulation

Porcine IFI16 Negatively Regulates cGAS Signaling Through the Restriction of DNA Binding and Stimulation
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猪 IFI16 通过限制 DNA 结合和刺激负调节 cGAS 信号传导

DOI:
10.3389/fimmu.2020.01669
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发表时间:
2020-08
影响因子:
7.3
通讯作者:
Jianzhong Zhu
Jianzhong Zhu
中科院分区:
医学2区
文献类型:
--
作者:
Wanglong Zheng;Rongyun Zhou;Shuangjie Li;Shan He;Jia Luo;Meiqin Zhu;Nanhua Chen;Hongjun Chen;François Meurens;Jianzhong Zhu

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天然免疫DNA传感器因其在抗DNA病毒和细胞内细菌感染方面的重要作用而受到广泛关注。在多种DNA传感器中,IFI 16和cGAS是两种主要的传感器,受到广泛的研究。然而,这两种DNA传感器在家畜动物还没有得到很好的定义。在这里,我们研究了猪IFI 16和cGAS,以及它们的相互关系。我们发现,这两种基因都能在DNA转染和HSV-1感染后向下游IFN发出STING依赖性信号,而cGAS在DNA信号传导中起主要作用。就它们的关系而言,IFI 16似乎干扰cGAS信号传导,如从转染和敲除细胞推断的。在机制上,IFI 16与激动剂DNA和信号转导衔接子STING竞争性结合,从而影响第二信使cGAMP产生和下游基因转录。此外,猪IFI 16的HIN 2结构域具有其大部分活性并介导cGAS抑制。因此,这项研究提供了一个独特的见解猪DNA传感系统。
The innate immunity DNA sensors have drawn much attention due to their significant importance against the infections with DNA viruses and intracellular bacteria. Among the multiple DNA sensors, IFI16, and cGAS are the two major ones, subjected to extensive studies. However, these two DNA sensors in livestock animals have not been well defined. Here, we studied the porcine IFI16 and cGAS, and their mutual relationship. We found that both enable STING-dependent signaling to downstream IFN upon DNA transfection and HSV-1 infection, and cGAS plays a major role in DNA signaling. In terms of their relationship, IFI16 appeared to interfere with cGAS signaling as deduced from both transfected and knockout cells. Mechanistically, IFI16 competitively binds with agonist DNA and signaling adaptor STING and thereby influences second messenger cGAMP production and downstream gene transcription. Furthermore, the HIN2 domain of porcine IFI16 harbored most of its activity and mediated cGAS inhibition. Thus, this study provides a unique insight into the porcine DNA sensing system.
ATM 和 IFI16 对 DNA 传感适配器 STING 的非规范激活可在核 DNA 损伤后介导 NF-κB 信号转导。
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