Cited by 1,201Autophagy in Disease and TherapyCardiac Fibrosis and RemodelingMitochondrial Function and Pathology

Mitochondrial DNA that escapes from autophagy causes inflammation and heart failure

Open access
Oka, Takafumi, Hikoso, Shungo, Yamaguchi, Osamu, Taneike, Manabu, Takeda, Toshihiro, Tamai, Takahito, Oyabu, Jota, Murakawa, Tomokazu +6 more·2012·Nature

Abstract

Heart failure is a leading cause of morbidity and mortality in industrialized countries. Although infection with microorganisms is not involved in the development of heart failure in most cases, inflammation has been implicated in the pathogenesis of heart failure. However, the mechanisms responsible for initiating and integrating inflammatory responses within the heart remain poorly defined. Mitochondria are evolutionary endosymbionts derived from bacteria and contain DNA similar to bacterial DNA. Mitochondria damaged by external haemodynamic stress are degraded by the autophagy/lysosome system in cardiomyocytes. Here we show that mitochondrial DNA that escapes from autophagy cell-autonomously leads to Toll-like receptor (TLR) 9-mediated inflammatory responses in cardiomyocytes and is capable of inducing myocarditis and dilated cardiomyopathy. Cardiac-specific deletion of lysosomal deoxyribonuclease (DNase) II showed no cardiac phenotypes under baseline conditions, but increased mortality and caused severe myocarditis and dilated cardiomyopathy 10 days after treatment with pressure overload. Early in the pathogenesis, DNase II-deficient hearts showed infiltration of inflammatory cells and increased messenger RNA expression of inflammatory cytokines, with accumulation of mitochondrial DNA deposits in autolysosomes in the myocardium. Administration of inhibitory oligodeoxynucleotides against TLR9, which is known to be activated by bacterial DNA, or ablation of Tlr9 attenuated the development of cardiomyopathy in DNase II-deficient mice. Furthermore, Tlr9 ablation improved pressure overload-induced cardiac dysfunction and inflammation even in mice with wild-type Dnase2a alleles. These data provide new perspectives on the mechanism of genesis of chronic inflammation in failing hearts.

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Crossref · 10.1038/nature10992

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  • APS patients met the 2006 revised Sapporo Criteria.

    “APS patients met the 2006 revised Sapporo Criteria (3)”

    From Identification of Mitofusin 1 and Complement Component 1q Subcomponent Binding Protein as Mitochondrial Targets in Systemic Lupus Erythematosus (2022) · cites this paper as [3]

    The Methods Summary (Animal study; no page provided) describes experiments in mice, not recruitment or classification of APS patients. Searches for the 2006 revised Sapporo Criteria and antiphospholipid syndrome found no passage in our copy addressing the claim. (LLM, conf=0.78)

    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 [20]

    The paper’s Abstract describes mitochondrial DNA accumulating inside cardiomyocyte autolysosomes and causing inflammation. It also mentions mitochondrial molecules entering circulation after trauma, but does not identify intact extracellular mitochondria in damaged tissues, inflammatory conditions, or critical care patients. Searches for extracellular mitochondria and those settings found no passage establishing the claim. (LLM, conf=0.75)

    Experimental — accuracy not yet measured
  • mtDNA can induce a pro-inflammatory state.

    “Mitochondria are a source of damage-associated molecular patterns (DAMPs), and among others, mtDNA has been shown to induce a pro-inflammatory state (Zhang et al, 2010;Oka et al, 2012;Wenceslau et al, 2014).”

    From Mitochondrial DNA and TLR9 drive muscle inflammation upon Opa1 deficiency (2018) · cites this paper as Oka et al, 2012

  • mtDNA activates immunity through TLR9 and cGAS pathways.

    “MtDNA has been reported to activate immunity through two distinct pathways, namely Toll-like receptor 9 (TLR9; Zhang et al, 2010;Oka et al, 2012;Liu et al, 2015), and cGAS activation (White et al, 2014;West et al, 2015).”

    From Mitochondrial DNA and TLR9 drive muscle inflammation upon Opa1 deficiency (2018) · cites this paper as Oka et al, 2012

  • Autophagy malfunction is related to presence of undegraded mtDNA recognized by TLR9 resulting in inflammation.

    “Recent data have established a relationship between autophagy malfunction and presence of undegraded mtDNA, which is recognized by TLR9 and results in inflammation (Nakahira et al, 2011;Oka et al, 2012).”

    From Mitochondrial DNA and TLR9 drive muscle inflammation upon Opa1 deficiency (2018) · cites this paper as Oka et al, 2012

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Authors
Oka, T., Hikoso, S., Yamaguchi, O., Taneike, M., Takeda, T., Tamai, T., Oyabu, J., Murakawa, T., Nakayama, H., Nishida, K., Akira, S., Yamamoto, A., Komuro, I., & Otsu, K.
Affiliations
  • The University of Osaka (JP)
  • King's College London (GB)
  • Immunology Frontier Research Center, The University of Osaka (JP)
  • Nagahama Institute of Bio-Science and Technology (JP)
Corresponding author
Otsu, Kinya
Venue
Nature
Published
2012-04-25
Volume
485
Issue
7397
Pages
251-255
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2092943609
Cited by
1,201
References
30
Citations by year
2026: 75 · 2025: 71 · 2024: 85 · 2023: 80 · 2022: 98 · 2021: 97 · 2020: 85 · 2019: 79 · 2018: 77 · 2017: 107 · 2016: 75 · 2015: 83 · 2014: 80 · 2013: 74 · 2012: 34
FWCI
64.37
Type
journal article
Language
en
Update notices
erratum (2012-09-19)
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Research Portal (King's College London) (submittedVersion)
Funders
  • British Heart Foundation (CH/11/3/29051, RG/11/12/29052)
  • Japan Society for the Promotion of Science (21390240, 21229010)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Fibrosis and Remodeling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
mitochondrial DNA, autophagy, heart failure, inflammation, TLR9, cardiomyocytes, DNase II, myocarditis, dilated cardiomyopathy, pressure overload, autolysosomes, oligodeoxynucleotides, cardiac dysfunction
MeSH terms
Alleles, Animals, Aorta, Autophagy, Constriction, Pathologic, DNA, Mitochondrial, Endodeoxyribonucleases, Heart, Cardiomegaly, Heart Failure, Lysosomes, Male, Mitochondria, Myocarditis, Myocardium, Pressure, RNA, Messenger, Signal Transduction, Cytokines, Myocytes, Cardiac, Toll-Like Receptor 9, Mice

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