Cited by 1,570Neutrophil, Myeloperoxidase and Oxidative MechanismsSystemic Lupus Erythematosus Researchinterferon and immune responses

Neutrophil extracellular traps enriched in oxidized mitochondrial DNA are interferogenic and contribute to lupus-like disease

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Lood, Christian, Blanco, Luz P, Purmalek, Monica M, Carmona-Rivera, Carmelo, De Ravin, Suk S, Smith, Carolyne K, Malech, Harry L, Ledbetter, Jeffrey A +2 more·2016·Nature Medicine

Abstract

Neutrophil extracellular traps (NETs) are implicated in autoimmunity, but how they are generated and their roles in sterile inflammation remain unclear. Ribonucleoprotein immune complexes (RNP ICs), inducers of NETosis, require mitochondrial reactive oxygen species (ROS) for maximal NET stimulation. After RNP IC stimulation of neutrophils, mitochondria become hypopolarized and translocate to the cell surface. Extracellular release of oxidized mitochondrial DNA is proinflammatory in vitro, and when this DNA is injected into mice, it stimulates type I interferon (IFN) signaling through a pathway dependent on the DNA sensor STING. Mitochondrial ROS are also necessary for spontaneous NETosis of low-density granulocytes from individuals with systemic lupus erythematosus. This was also observed in individuals with chronic granulomatous disease, who lack NADPH oxidase activity but still develop autoimmunity and type I IFN signatures. Mitochondrial ROS inhibition in vivo reduces disease severity and type I IFN responses in a mouse model of lupus. Together, these findings highlight a role for mitochondria in the generation not only of NETs but also of pro-inflammatory oxidized mitochondrial DNA in autoimmune diseases.

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  • Mitochondrial reactive oxygen species contribute to inflammatory responses and antimicrobial activities.

    “mitochondrial reactive oxygen species (mtROS)56, known to contribute to inflammatory responses and antimicrobial activities57–59”

    From The role of mitochondria in rheumatic diseases (2022) · cites this paper as [57]

    The Results section ('RNP IC-mediated NETosis is dependent on mitochondrial ROS') links mitochondrial ROS to neutrophil extracellular trap formation, and the Discussion links it to autoimmune inflammation. The passages do not establish that mitochondrial ROS contribute to antimicrobial activity; the paper’s mention of pathogen-induced traps does not make that specific connection. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • In neutrophils activated by immune complexes containing U1 snRNPs, mitochondria produce excessive ROS that supports NET formation and extrusion.

    “Mechanistically, in neutrophils activated by immune complexes containing U1 small nuclear ribonucleoproteins (SnRNPs), mitochondria generate excessive amounts of ROS, which supports the formation and extrusion of NETs”

    From The role of mitochondria in rheumatic diseases (2022) · cites this paper as [57]

    The Results section on RNP immune complex–mediated NETosis reports increased mitochondrial ROS after neutrophil activation and shows that inhibiting mitochondrial activity reduces NET formation. The Online methods describe the complexes as containing SmRNP antigen and anti-RNP antibodies, but our copy does not identify the antigen specifically as U1 snRNP. No page numbers are available in our copy. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Extruded mitochondrial components contain highly oxidized mtDNA that can provoke cGAS-STING-dependent type I interferon production, probably conserved across cell types.

    “The extruded mitochondrial components contain highly oxidized mtDNA that can provoke type I interferon production in a cGAS–STING-dependent manner, a process probably well conserved among all cell types given the ubiquity of these molecules.”

    From The role of mitochondria in rheumatic diseases (2022) · cites this paper as [57]

    The Results (‘RNP ICs induce oxidized mtDNA release’ and ‘NET-bound oxidized mtDNA is pro-inflammatory’; page not provided) report release of oxidized mtDNA and STING-dependent interferon-related responses. They do not establish that the response is conserved across all cell types: oxidized mtDNA stimulated PBMCs and THP1 cells but did not activate neutrophils despite being internalized. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Different cellular lineages may extrude their mitochondria upon activation.

    “Different cellular lineages (10–18) may extrude their mitochondria upon activation.”

    From Autoantibodies in Systemic Lupus Erythematosus Target Mitochondrial RNA (2019) · cites this paper as [11]

    In Results (‘RNP ICs induce oxidized mtDNA release’; page unavailable), the paper says damaged mitochondria can undergo extrusion and reports that activated neutrophils mobilize mitochondria to the cell surface and release oxidized mitochondrial DNA. It does not establish that different cellular lineages extrude whole mitochondria upon activation. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Extracellular mitochondria have been identified in damaged tissues, diverse inflammatory conditions, and in the blood of critical care patients.

    “Extracellular mitochondria have been identified in damaged tissues (8, 18–20); diverse inflammatory conditions (11, 12, 14, 21–24); and in the blood of critical care patients (22).”

    From Autoantibodies in Systemic Lupus Erythematosus Target Mitochondrial RNA (2019) · cites this paper as [11]

    The Results sections on SLE and CGD report extracellular NETs enriched in mitochondrial DNA in these inflammatory diseases. They do not establish that intact extracellular mitochondria were identified; the paper describes release of oxidized mitochondrial DNA instead. This citation is attached to the inflammatory-conditions clause, not the claims about damaged tissues or critical-care patients. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

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Authors
Lood, C., Blanco, L. P., Purmalek, M. M., Carmona-Rivera, C., De Ravin, S. S., Smith, C. K., Malech, H. L., Ledbetter, J. A., Elkon, K. B., & Kaplan, M. J.
Affiliations
  • University of Washington (US)
  • National Institutes of Health (US)
Corresponding author
  • Elkon, Keith B
  • Kaplan, Mariana J
Venue
Nature Medicine
Published
2016-01-18
Volume
22
Issue
2
Pages
146-153
ISSN
  • 1078-8956 (ISSN-L)
  • 1546-170X
OpenAlex
W2261479737
Cited by
1,570
References
60
Citations by year
2026: 152 · 2025: 157 · 2024: 200 · 2023: 166 · 2022: 170 · 2021: 183 · 2020: 125 · 2019: 151 · 2018: 103 · 2017: 92 · 2016: 68
FWCI
83.52
Type
journal article
Language
en
Open access
Locations
  • Nature Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (Z99 AR999999)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Health Sciences › Medicine › Rheumatology › Systemic Lupus Erythematosus Research
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
Keywords
neutrophil extracellular traps, oxidized mitochondrial DNA, systemic lupus erythematosus, NETosis, mitochondrial reactive oxygen species, type I interferon signaling, STING, chronic granulomatous disease, NADPH oxidase, autoimmunity, sterile inflammation, mitochondrial translocation
MeSH terms
Adult, Animals, Antigen-Antibody Complex, DNA, Mitochondrial, Female, Granulomatous Disease, Chronic, Humans, Interferon Type I, Kidney, Lupus Erythematosus, Systemic, Male, Microscopy, Fluorescence, Mitochondria, Peroxidase, Neutrophils, Oxidation-Reduction, Ribonucleoproteins, Reactive Oxygen Species, Jurkat Cells, NADPH Oxidases, Immunoprecipitation, Mice, Real-Time Polymerase Chain Reaction, Extracellular Traps, In Vitro Techniques

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