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The APPL1-Rab5 axis restricts NLRP3 inflammasome activation through early endosomal-dependent mitophagy in macrophages

Author

Listed:
  • Kelvin Ka Lok Wu

    (The Hong Kong Polytechnic University)

  • KeKao Long

    (The Hong Kong Polytechnic University)

  • Huige Lin

    (The Hong Kong Polytechnic University)

  • Parco Ming Fai Siu

    (School of Public Health, The University of Hong Kong)

  • Ruby Lai Chong Hoo

    (The State Key Laboratory of Pharmaceutical Biotechnology, The University of Hong Kong
    The University of Hong Kong)

  • Dewei Ye

    (Guangdong Research Center of Metabolic Diseases of Integrated Western and Chinese Medicine, Guangdong Pharmaceutical University)

  • Aimin Xu

    (The State Key Laboratory of Pharmaceutical Biotechnology, The University of Hong Kong
    The University of Hong Kong
    The University of Hong Kong)

  • Kenneth King Yip Cheng

    (The Hong Kong Polytechnic University)

Abstract

Although mitophagy is known to restrict NLRP3 inflammasome activation, the underlying regulatory mechanism remains poorly characterized. Here we describe a type of early endosome-dependent mitophagy that limits NLRP3 inflammasome activation. Deletion of the endosomal adaptor protein APPL1 impairs mitophagy, leading to accumulation of damaged mitochondria producing reactive oxygen species (ROS) and oxidized cytosolic mitochondrial DNA, which in turn trigger NLRP3 inflammasome overactivation in macrophages. NLRP3 agonist causes APPL1 to translocate from early endosomes to mitochondria, where it interacts with Rab5 to facilitate endosomal-mediated mitophagy. Mice deficient for APPL1 specifically in hematopoietic cell are more sensitive to endotoxin-induced sepsis, obesity-induced inflammation and glucose dysregulation. These are associated with increased expression of systemic interleukin-1β, a major product of NLRP3 inflammasome activation. Our findings indicate that the early endosomal machinery is essential to repress NLRP3 inflammasome hyperactivation by promoting mitophagy in macrophages.

Suggested Citation

  • Kelvin Ka Lok Wu & KeKao Long & Huige Lin & Parco Ming Fai Siu & Ruby Lai Chong Hoo & Dewei Ye & Aimin Xu & Kenneth King Yip Cheng, 2021. "The APPL1-Rab5 axis restricts NLRP3 inflammasome activation through early endosomal-dependent mitophagy in macrophages," Nature Communications, Nature, vol. 12(1), pages 1-17, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26987-1
    DOI: 10.1038/s41467-021-26987-1
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