iScience (May 2024)

Mycobacterial CpsA activates type I IFN signaling in macrophages via cGAS-mediated pathway

  • Yue Ding,
  • Jingfeng Tong,
  • Geyang Luo,
  • Rongfeng Sun,
  • Cheng Bei,
  • Zhihua Feng,
  • Lu Meng,
  • Fei Wang,
  • Jing Zhou,
  • Zihan Chen,
  • Duoduo Li,
  • Yufeng Fan,
  • Shu Song,
  • Decheng Wang,
  • Carl G. Feng,
  • Haipeng Liu,
  • Qi Chen,
  • Bo Yan,
  • Qian Gao

Journal volume & issue
Vol. 27, no. 5
p. 109807

Abstract

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Summary: Type I interferon (IFN) production is crucial in tuberculosis pathogenesis, yet the bacterial factors initiating this process are incompletely understood. CpsA, protein of Mycobacterium marinum and Mycobacterium tuberculosis, plays a key role in maintaining bacterial virulence and inhibiting host cell LC3-associated phagocytosis. By utilizing CpsA full deletion mutant studies, we re-verified its essential role in infection-induced pathology and revealed its new role in type I IFN expression. CpsA deficiency hindered IFN production in infected macrophages in vitro as well as zebrafish and mice in vivo. This effect was linked to the cGAS-TBK1-IRF3 pathway, as evidenced by decreased TBK1 and IRF3 phosphorylation in CpsA-deficient bacterial strain-infected macrophages. Moreover, we further show that CpsA deficiency cause decreased cytosolic DNA levels, correlating with impaired phagosomal membrane rupture. Our findings reveal a new function of mycobacterial CpsA in type I IFN production and offer insight into the molecular mechanisms underlying mycobacterial infection pathology.

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