Cited by 1,659Immune Response and InflammationNeutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stress

Tlr signalling augments macrophage bactericidal activity through mitochondrial ros

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West, A. Phillip, Brodsky, Igor E., Rahner, Christoph, Woo, Dong Kyun, Erdjument-Bromage, Hediye, Tempst, Paul, Walsh, Matthew C., Choi, Yongwon +2 more·2011·Nature

Abstract

Reactive oxygen species (ROS) are essential components of the innate immune response against intracellular bacteria and it is thought that professional phagocytes generate ROS primarily via the phagosomal NADPH oxidase machinery. However, recent studies have suggested that mitochondrial ROS (mROS) also contribute to mouse macrophage bactericidal activity, although the mechanisms linking innate immune signalling to mitochondria for mROS generation remain unclear. Here we demonstrate that engagement of a subset of Toll-like receptors (TLR1, TLR2 and TLR4) results in the recruitment of mitochondria to macrophage phagosomes and augments mROS production. This response involves translocation of a TLR signalling adaptor, tumour necrosis factor receptor-associated factor 6 (TRAF6), to mitochondria, where it engages the protein ECSIT (evolutionarily conserved signalling intermediate in Toll pathways), which is implicated in mitochondrial respiratory chain assembly. Interaction with TRAF6 leads to ECSIT ubiquitination and enrichment at the mitochondrial periphery, resulting in increased mitochondrial and cellular ROS generation. ECSIT- and TRAF6-depleted macrophages have decreased levels of TLR-induced ROS and are significantly impaired in their ability to kill intracellular bacteria. Additionally, reducing macrophage mROS levels by expressing catalase in mitochondria results in defective bacterial killing, confirming the role of mROS in bactericidal activity. These results reveal a novel pathway linking innate immune signalling to mitochondria, implicate mROS as an important component of antibacterial responses and further establish mitochondria as hubs for innate immune signalling.

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  • Generation of oxidative stress in pathogen-containing phagosomes of phagocytes is a crucial component of antimicrobial immunity.

    “Generation of oxidative stress in pathogen-containing phagosomes of phagocytes, for example, is a crucial component of antimicrobial immunity [58,61,79].”

    From Functions of ROS in Macrophages and Antimicrobial Immunity (2021) · cites this paper as [61]

  • mtROS production is actively triggered by a number of different stimuli including recognition of pathogens and PAMPs or endogenous molecules such as TNF.

    “In recent years, however, several studies have shown that mtROS production is actively triggered by a number of different stimuli including the recognition of pathogens and pathogen-associated molecular patterns (PAMPs) [30,61] or endogenous molecules such as TNF [48,136].”

    From Functions of ROS in Macrophages and Antimicrobial Immunity (2021) · cites this paper as [61]

  • Mitochondria can be recruited as a source for phagosomal ROS during bacterial infection.

    “Not only Nox2 but also mitochondria can be recruited as source for phagosomal ROS during bacterial infection [61].”

    From Functions of ROS in Macrophages and Antimicrobial Immunity (2021) · cites this paper as [61]

  • ROS have to be produced in direct vicinity of the regulated target and do not excessively saturate the cell until they hit their target at random.

    “supporting the observation of other studies that ROS have to be produced in direct vicinity of the regulated target and do not excessively saturate the cell until they hit their target at random [29,30,37,61,125,273].”

    From Functions of ROS in Macrophages and Antimicrobial Immunity (2021) · cites this paper as [61]

  • Macrophages recruit mitochondria to the phagosome to increase ROS production, overcoming the antioxidative capacities of S.t.

    “In response, macrophages recruit mitochondria to the phagosome to increase the ROS production in the phagosome finally overcoming the antioxidative capacities of S.t. (see Figure 5).”

    From Functions of ROS in Macrophages and Antimicrobial Immunity (2021) · cites this paper as [61]

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Authors
West, A. P., Brodsky, I. E., Rahner, C., Woo, D. K., Erdjument-Bromage, H., Tempst, P., Walsh, M. C., Choi, Y., Shadel, G. S., & Ghosh, S.
Affiliations
  • Yale University (US)
  • Memorial Sloan Kettering Cancer Center (US)
  • University of Pennsylvania (US)
  • Columbia University (US)
Corresponding author
Ghosh, Sankar
Venue
Nature
Published
2011-04
Volume
472
Issue
7344
Pages
476-480
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1977039417
Cited by
1,659
References
37
Citations by year
2026: 112 · 2025: 116 · 2024: 137 · 2023: 132 · 2022: 129 · 2021: 160 · 2020: 145 · 2019: 108 · 2018: 97 · 2017: 104 · 2016: 94 · 2015: 85 · 2014: 75 · 2013: 74 · 2012: 67
FWCI
33.92
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Institutes of Health
  • National Institute of Allergy and Infectious Diseases (R37 AI33443, R37AI033443, R01AI033443)
  • National Institute of Neurological Disorders and Stroke (NS-056206, R01NS056206)
  • National Institute of Environmental Health Sciences (P01ES011163)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
Toll-like receptors, TLR1, TLR2, TLR4, macrophages, mitochondrial reactive oxygen species, bactericidal activity, phagosome, TRAF6, ECSIT, ubiquitination, mitochondrial recruitment, intracellular bacterial killing, catalase, innate immune signaling, mitochondria
MeSH terms
Animals, Catalase, Cell Line, Immunity, Innate, Macrophages, Mice, Inbred C57BL, Mice, Transgenic, Mitochondria, Phagosomes, Salmonella, Signal Transduction, Reactive Oxygen Species, Ubiquitin-Protein Ligases, TNF Receptor-Associated Factor 6, Adaptor Proteins, Signal Transducing, Toll-Like Receptors, Mice, Ubiquitination

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