Cited by 850Inflammasome and immune disordersMitochondrial Function and PathologyImmune Response and Inflammation

Oxidized DNA fragments exit mitochondria via mPTP- and VDAC-dependent channels to activate NLRP3 inflammasome and interferon signaling

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Xian, Hongxu, Watari, Kosuke, Sanchez-Lopez, Elsa, Offenberger, Joseph, Onyuru, Janset, Sampath, Harini, Ying, Wei, Hoffman, Hal M. +2 more·2022·Immunity

Abstract

Mitochondrial DNA (mtDNA) escaping stressed mitochondria provokes inflammation via cGAS-STING pathway activation and, when oxidized (Ox-mtDNA), it binds cytosolic NLRP3, thereby triggering inflammasome activation. However, it is unknown how and in which form Ox-mtDNA exits stressed mitochondria in non-apoptotic macrophages. We found that diverse NLRP3 inflammasome activators rapidly stimulated uniporter-mediated calcium uptake to open mitochondrial permeability transition pores (mPTP) and trigger VDAC oligomerization. This occurred independently of mtDNA or reactive oxygen species, which induce Ox-mtDNA generation. Within mitochondria, Ox-mtDNA was either repaired by DNA glycosylase OGG1 or cleaved by the endonuclease FEN1 to 500-650 bp fragments that exited mitochondria via mPTP- and VDAC-dependent channels to initiate cytosolic NLRP3 inflammasome activation. Ox-mtDNA fragments also activated cGAS-STING signaling and gave rise to pro-inflammatory extracellular DNA. Understanding this process will advance the development of potential treatments for chronic inflammatory diseases, exemplified by FEN1 inhibitors that suppressed interleukin-1β (IL-1β) production and mtDNA release in mice.

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  1. Elliott EI, and Sutterwala FS (2015). Initiation and perpetuation of NLRP3 inflammasome activation and assembly. Immunol Rev 265, 35– 52. 25879282 PMC4400874
  2. Rizzuto R, Pinton P, Carrington W, Fay FS, Fogarty KE, Lifshitz LM, Tuft RA, and Pozzan T (1998). Close contacts with the endoplasmic reticulum as determinants of mitochondrial Ca2+ responses. Science 280, 1763– 1766. 9624056

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Authors
Xian, H., Watari, K., Sanchez-Lopez, E., Offenberger, J., Onyuru, J., Sampath, H., Ying, W., Hoffman, H. M., Shadel, G. S., & Karin, M.
Affiliations
  • University of California San Diego (US)
  • Rutgers, The State University of New Jersey (US)
  • Salk Institute for Biological Studies (US)
Corresponding author
Karin, Michael
Venue
Immunity
Publisher
Elsevier BV
Published
2022-08
Volume
55
Issue
8
Pages
1370-1385.e8
ISSN
1074-7613 (ISSN-L)
OpenAlex
W4285098776
Cited by
850
References
74
Citations by year
2026: 276 · 2025: 249 · 2024: 184 · 2023: 120 · 2022: 21
FWCI
47.03
Type
journal article
Language
en
Open access
Locations
  • Immunity (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • ImmPort
Funders
  • National Cancer Institute (U54CA260591, P30CA023100, P30CA014195)
  • National Institute of Allergy and Infectious Diseases (R01AI043477, R37AI043477, R25AI147376)
  • National Institute of Diabetes and Digestive and Kidney Diseases (K99DK100640, R00DK100640)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (K01AR077111, P30AR073761, R01AR069876)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
oxidized mitochondrial DNA, mitochondrial permeability transition pore, voltage-dependent anion channel, NLRP3 inflammasome, cGAS-STING pathway, interferon signaling, macrophages, mitochondrial calcium uptake, OGG1, FEN1, extracellular DNA, IL-1β, chronic inflammation
MeSH terms
NLR Family, Pyrin Domain-Containing 3 Protein, Mitochondrial Permeability Transition Pore, Animals, DNA, Mitochondrial, Interferons, Mitochondria, Nucleotidyltransferases, Mice, Inflammasomes

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