Frontiers in Immunology (Oct 2022)

Porcine cGAS-STING signaling induced autophagy inhibits STING downstream IFN and apoptosis

  • Nengwen Xia,
  • Nengwen Xia,
  • Nengwen Xia,
  • Nengwen Xia,
  • Wanglong Zheng,
  • Wanglong Zheng,
  • Wanglong Zheng,
  • Wanglong Zheng,
  • Sen Jiang,
  • Sen Jiang,
  • Sen Jiang,
  • Sen Jiang,
  • Qi Cao,
  • Qi Cao,
  • Qi Cao,
  • Qi Cao,
  • Jia Luo,
  • Jia Luo,
  • Jia Luo,
  • Jia Luo,
  • Jiajia Zhang,
  • Jiajia Zhang,
  • Jiajia Zhang,
  • Jiajia Zhang,
  • Yulin Xu,
  • Yulin Xu,
  • Yulin Xu,
  • Yulin Xu,
  • Shaohua Sun,
  • Shaohua Sun,
  • Shaohua Sun,
  • Shaohua Sun,
  • Kaili Zhang,
  • Kaili Zhang,
  • Kaili Zhang,
  • Kaili Zhang,
  • Nanhua Chen,
  • Nanhua Chen,
  • Nanhua Chen,
  • Nanhua Chen,
  • François Meurens,
  • François Meurens,
  • Jianzhong Zhu,
  • Jianzhong Zhu,
  • Jianzhong Zhu,
  • Jianzhong Zhu

DOI
https://doi.org/10.3389/fimmu.2022.1021384
Journal volume & issue
Vol. 13

Abstract

Read online

The innate immune DNA sensing cGAS-STING signaling pathway has been widely recognized for inducing interferons (IFNs) and subsequent antiviral state. In addition to IFN, the cGAS-STING pathway also elicits other cell autonomous immunity events including autophagy and apoptosis. However, the downstream signaling events of this DNA sensing pathway in livestock have not been well defined. Here, we systematically analyzed the porcine STING (pSTING) induced IFN, autophagy and apoptosis, revealed the distinct dynamics of three STING downstream events, and established the IFN independent inductions of autophagy and apoptosis. Further, we investigated the regulation of autophagy on pSTING induced IFN and apoptosis. Following TBK1-IRF3-IFN activation, STING induced Atg5/Atg16L1 dependent autophagy through LIR motifs. In turn, the autophagy likely promoted the pSTING degradation, inhibited both IFN production and apoptosis, and thus restored the cell homeostasis. Therefore, this study sheds lights on the molecular mechanisms of innate immunity in pigs.

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