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Roles of innate immune regulator TAPE in RIG-I signaling and antiviral defenses

机译:先天性免疫调节剂TAPE在RIG-I信号传导和抗病毒防御中的作用

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摘要

[[abstract]]Pattern-recognition receptors detect pathogen-associated molecular patterns to trigger downstream pathways leading to type I IFN production to defend pathogen infection. RIG-I-like receptors (RLRs) are key cytosolic sensors for recognizing viral RNA to trigger antiviral immunity. The underlying mechanisms linking RLR-mediated viral recognition to antiviral immunity remain to be further explored. Through our previous work, we uncovered an innate immune regulator termed TAPE (TBK1-Associated Protein in Endolysosomes), also known as CC2D1A, which is implicated in the viral RNA senor TLR3 and RLR pathways. Yet, the in vivo role of TAPE in antiviral defenses and the mechanistic mechanisms of how TAPE regulates cytosolic RIG-I signaling still remain to be established. TAPE conditional knockout mice were generated for our study. Results from in vivo studies showed that TAPE f/f CD11c-Cre mice exhibited a more severe mortality than WT mice upon influenza A virus (IAV) infection. Ex vivo studies also showed that TAPE-deficient mouse embryonic fibroblasts and macrophages were defective in type-I interferon induction upon RLR ligand stimulation. In addition, our biochemical analyses showed that the N-terminal region of TAPE was critical for interacting with the CARD domain of RIG-I while the C-terminal region of TAPE contributed most to the interaction with MAVS/IPS-1, a RLR downstream mediator. Together, our results suggest a crucial role for TAPE in linking RIG-I to type I IFN-mediated antiviral responses. Future work will further determine the in vivo role of TAPE in IAV and other RNA virus infection, and explore the mechanistic mechanisms of how TAPE regulates RIG-I signaling.
机译:[[摘要]]模式识别受体检测与病原体相关的分子模式,从而触发导致I型IFN产生的下游途径,以防御病原体感染。 RIG-I样受体(RLR)是识别病毒RNA触发抗病毒免疫的关键胞质传感器。将RLR介导的病毒识别与抗病毒免疫性联系起来的潜在机制仍有待进一步探索。通过我们以前的工作,我们发现了一种称为TAPE(内溶酶体中的TBK1相关蛋白)的先天免疫调节剂,也称为CC2D1A,它与病毒RNA传感器TLR3和RLR途径有关。然而,TAPE在抗病毒防御中的体内作用以及TAPE如何调节胞质RIG-I信号传导的机制仍待建立。 TAPE条件性基因敲除小鼠被生成用于我们的研究。体内研究的结果表明,TAPE f / f CD11c-Cre小鼠在感染A型流感病毒后表现出比WT小鼠更高的死亡率。体外研究还表明,在RLR配体刺激下,缺乏TAPE的小鼠胚胎成纤维细胞和巨噬细胞在I型干扰素诱导中存在缺陷。此外,我们的生化分析表明,TAPE的N端区域对于与RIG-I的CARD结构域相互作用至关重要,而TAPE的C端区域对与MAVS / IPS-1(下游RLR下游)的相互作用贡献最大调解员。在一起,我们的结果表明TAPE在将RIG-I与I型IFN介导的抗病毒反应连接中起着至关重要的作用。未来的工作将进一步确定TAPE在IAV和其他RNA病毒感染中的体内作用,并探索TAPE如何调节RIG-I信号传导的机制。

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    Chen, KR;

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  • 年度 2016
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