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Executioner caspases restrict mitochondrial RNA-driven Type I IFN induction during chemotherapy-induced apoptosis

Author

Listed:
  • Shane T. Killarney

    (Duke University)

  • Rachel Washart

    (Duke University)

  • Ryan S. Soderquist

    (Duke University)

  • Jacob P. Hoj

    (Duke University)

  • Jamie Lebhar

    (Duke University)

  • Kevin H. Lin

    (Duke University
    Brigham and Women’s Hospital and Harvard Medical School)

  • Kris C. Wood

    (Duke University)

Abstract

During apoptosis, mitochondrial outer membrane permeabilization (MOMP) enables certain mitochondrial matrix macromolecules to escape into the cytosol. However, the fate of mitochondrial RNA (mtRNA) during apoptosis is unknown. Here, we demonstrate that MOMP results in the cytoplasmic release of mtRNA and that executioner caspases-3 and -7 (casp3/7) prevent cytoplasmic mtRNA from triggering inflammatory signaling. In the setting of genetic or pharmacological casp3/7 inhibition, apoptotic insults result in mtRNA activation of the MDA5/MAVS/IRF3 pathway to drive Type I interferon (IFN) signaling. This pathway is sufficient to activate tumor-intrinsic Type I IFN signaling in immunologically cold cancer models that lack an intact cGAS/STING signaling pathway, promote CD8+ T-cell-dependent anti-tumor immunity, and overcome anti-PD1 refractoriness in vivo. Thus, a key function of casp3/7 is to inhibit inflammation caused by the cytoplasmic release of mtRNA, and pharmacological modulation of this pathway increases the immunogenicity of chemotherapy-induced apoptosis.

Suggested Citation

  • Shane T. Killarney & Rachel Washart & Ryan S. Soderquist & Jacob P. Hoj & Jamie Lebhar & Kevin H. Lin & Kris C. Wood, 2023. "Executioner caspases restrict mitochondrial RNA-driven Type I IFN induction during chemotherapy-induced apoptosis," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37146-z
    DOI: 10.1038/s41467-023-37146-z
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