Cited by 194Immune Response and InflammationNF-κB Signaling PathwaysInflammation biomarkers and pathways

Mitochondrial DNA induces inflammation and increases TLR9/NF-κB expression in lung tissue

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ZHANG, JIAN-ZHENG, LIU, ZHI, LIU, JIA, REN, JI-XIN, SUN, TIAN-SHENG·2014·International Journal of Molecular Medicine

Abstract

Mitochondrial DNA (mtDNA) contains unmethylated CpG motifs that exhibit immune stimulatory capacities. The aim of this study was to investigate whether mtDNA activates the Toll-like receptor 9 (TLR9)/nuclear factor-κB (NF-κB) pathway, thereby contributing to post-traumatic systemic inflammatory response syndrome (SIRS) and lung injury in rats. The effects of mtDNA on macrophage culture were examined in order to elucidate the putative cellular mechanisms. Rats and macrophage cultures were treated with phosphate-buffered saline, nuclear DNA, or mtDNA for 2, 4, 8 and 24 h. Histological analysis of lung tissue was undertaken following hematoxylin and eosin staining, and cytokine levels were assessed by ELISA. NF-κB and IκB-α phosphorylation levels, as well as TLR9 protein expression were determined by western blot analysis; NF-κB, IκB-α and TLR9 mRNA levels were analyzed by RT-PCR. A greater degree of inflammation and lung injury was observed in response to mtDNA. In addition, mtDNA increased serum tumor necrosis factor-α, interleukin (IL)-6 and IL-10 levels in vivo and increased their secretion by cultured macrophages (p<0.05). In lung tissue, mtDNA increased NF-κB, IκB-α and TLR9 mRNA levels (p<0.05); it also increased phosphorylated NF-κB p65 and TLR9 protein levels in the macrophage cultures. Thus, mtDNA may be part of the danger-associated molecular patterns, contributing to the initiation of sterile SIRS through the activation of the TLR9/NF-κB pathway and the induction of pro-inflammatory cytokine production.

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Crossref · 10.3892/ijmm.2014.1650This paper is marked retracted.

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  • TLR9 interaction with mtDNA activates NF-kB signaling and increases pro-inflammatory cytokine expression.

    “Interaction of TLR9 with mtDNA activates the nuclear factor kappa B (NF-jB) signaling and increases the expression of other pro-inflammatory cytokines such as tumor necrosis factor-a (TNF-a), interleukin (IL)-6, IL-1b (Julian et al, 2013;Yu & Bennett, 2014;Zhang et al, 2014).”

    From Mitochondrial DNA and TLR9 drive muscle inflammation upon Opa1 deficiency (2018) · cites this paper as Zhang et al, 2014

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  1. [42]Adib-Conquy M Cavaillon JM Host inflammatory and anti-inflammatory response during sepsis Pathol Biol (Paris) 60 306 313 2012 (In French) 22542429

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Authors
ZHANG, J.-Z., LIU, Z., LIU, J., REN, J.-X., & SUN, T.-S.
Affiliations
The Military General Hospital of Beijing PLA (CN)
Venue
International Journal of Molecular Medicine
Published
2014-02-10
Volume
33
Issue
4
Pages
817-824
ISSN
  • 1107-3756 (ISSN-L)
  • 1791-244X
OpenAlex
W2165572246
Cited by
194
References
50
Citations by year
2026: 1 · 2025: 6 · 2024: 6 · 2023: 15 · 2022: 21 · 2021: 23 · 2020: 27 · 2019: 24 · 2018: 22 · 2017: 16 · 2016: 16 · 2015: 12 · 2014: 5
FWCI
7.46
Type
journal article
Language
en
Status
Retracted
Open access
Licence
cc-by-nc
Locations
  • International Journal of Molecular Medicine (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
  • Life Sciences › Immunology and Microbiology › Immunology › Inflammation biomarkers and pathways
Keywords
mitochondrial DNA, TLR9, NF-κB signaling, systemic inflammatory response syndrome, lung injury, macrophages, damage-associated molecular patterns, sterile inflammation, inflammatory cytokines, TNF-α, interleukin-6, IL-10, IκBα phosphorylation, CpG motifs
MeSH terms
NF-KappaB Inhibitor alpha, Animals, Cells, Cultured, DNA, Mitochondrial, Gene Expression Regulation, Inflammation, Lung, Macrophages, Male, Phosphorylation, RNA, Messenger, Cytokines, NF-kappa B, Rats, Sprague-Dawley, I-kappa B Proteins, Toll-Like Receptor 9, Rats, Acute Lung Injury

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