4.6 Article

Type I IFN expression is stimulated by cytosolic MtDNA released from pneumolysin-damaged mitochondria via the STING signaling pathway in macrophages

Journal

FEBS JOURNAL
Volume 286, Issue 23, Pages 4754-4768

Publisher

WILEY
DOI: 10.1111/febs.15001

Keywords

IFN-beta; mitochondrial damage; mtDNA; Ply; STING

Funding

  1. National Natural Science Foundation of China [81772132]
  2. Project Foundation of Chongqing Science and Technology Committee [csct2015jcyjA10012]

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Pneumolysin (Ply), a major virulence factor of Streptococcus pneumoniae (S. pn), affects the immunity of host cells during infection. It has been reported that Ply is involved in S. pn standard strain D39-induced interferon-beta (IFN-beta) expression; however, other findings suggest that recombinant Ply protein is incapable of triggering IFN-beta expression. Here, we demonstrated that purified Ply was capable of initiating oxidative damage to mitochondria, resulting in the subsequent release of mitochondrial deoxyribonucleic acid (mtDNA), which mediated IFN-beta expression in macrophages. Importantly, we determined that IFN-beta expression was regulated by stimulator of interferon genes (STING) signaling in response to Ply. In conclusion, our study identified that IFN-beta production was triggered by Ply in macrophages and mtDNA released from Ply-damaged mitochondria mediated this process, through the STING pathway. This is a novel mechanism by which S. pn modulates type I IFN response in macrophages.

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