The cGas-Sting Signaling Pathway Is Required for the Innate Immune Response Against Ectromelia Virus.

The cGas-Sting Signaling Pathway Is Required for the Innate Immune Response Against Ectromelia Virus.
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DOI:
10.3389/fimmu.2018.01297
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发表时间:
2018
影响因子:
7.3
通讯作者:
Jing ZZ
Jing ZZ
中科院分区:
医学2区
文献类型:
--
作者:
Cheng WY;He XB;Jia HJ;Chen GH;Jin QW;Long ZL;Jing ZZ

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DNA依赖性先天免疫途径的激活在宿主防御痘病毒中起关键作用。环GMP-AMP合酶(cGAS)是一种关键的细胞溶质DNA传感器,其在活化时产生环二核苷酸cGMP-AMP(cGAMP),其触发干扰素基因刺激物(STING),导致I型干扰素(IFN)产生和抗病毒应答。鼠痘病毒(ECTV)已成为研究宿主-正痘病毒关系的一个有价值的模型。然而,cGas-Sting通路在响应ECTV中的作用尚不清楚。在这里,我们发现鼠细胞(L929和RAW264.7)对ECTV产生I型IFN应答,这些应答依赖于cGas、Sting、TANK结合激酶1(Tbk 1)和干扰素调节因子3(Irf 3)信号传导。破坏小鼠巨噬细胞中的cGas或Sting表达阻断I型IFN的产生并促进ECTV复制。一致地,cGas或Sting缺陷的小鼠表现出较低的I型IFN水平和较高的病毒载量,并且更容易患小鼠痘。总的来说,我们的研究表明,cGas-Sting途径是至关重要的感应ECTV感染,诱导I型IFN的生产,并控制ECTV复制。
Activation of the DNA-dependent innate immune pathway plays a pivotal role in the host defense against poxvirus. Cyclic GMP-AMP synthase (cGAS) is a key cytosolic DNA sensor that produces the cyclic dinucleotide cGMP-AMP (cGAMP) upon activation, which triggers stimulator of interferon genes (STING), leading to type I Interferons (IFNs) production and an antiviral response. Ectromelia virus (ECTV) has emerged as a valuable model for investigating the host–Orthopoxvirus relationship. However, the role of cGas–Sting pathway in response to ECTV is not clearly understood. Here, we showed that murine cells (L929 and RAW264.7) mount type I IFN responses to ECTV that are dependent upon cGas, Sting, TANK binding kinase 1 (Tbk1), and interferon regulatory factor 3 (Irf3) signaling. Disruption of cGas or Sting expression in mouse macrophages blocked the type I IFN production and facilitated ECTV replication. Consistently, mice deficient in cGas or Sting exhibited lower type I IFN levels and higher viral loads, and are more susceptible to mousepox. Collectively, our study indicates that the cGas–Sting pathway is critical for sensing of ECTV infection, inducing the type I IFN production, and controlling ECTV replication.
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