Cited by 2,658Inflammasome and immune disordersImmune Response and InflammationOccupational and environmental lung diseases

Innate Immune Activation Through Nalp3 Inflammasome Sensing of Asbestos and Silica

Open access
Dostert, Catherine, Pétrilli, Virginie, Van Bruggen, Robin, Steele, Chad, Mossman, Brooke T., Tschopp, Jürg·2008·Science

Abstract

The inhalation of airborne pollutants, such as asbestos or silica, is linked to inflammation of the lung, fibrosis, and lung cancer. How the presence of pathogenic dust is recognized and how chronic inflammatory diseases are triggered are poorly understood. Here, we show that asbestos and silica are sensed by the Nalp3 inflammasome, whose subsequent activation leads to interleukin-1β secretion. Inflammasome activation is triggered by reactive oxygen species, which are generated by a NADPH oxidase upon particle phagocytosis. (NADPH is the reduced form of nicotinamide adenine dinucleotide phosphate.) In a model of asbestos inhalation, Nalp3 –/– mice showed diminished recruitment of inflammatory cells to the lungs, paralleled by lower cytokine production. Our findings implicate the Nalp3 inflammasome in particulate matter–related pulmonary diseases and support its role as a major proinflammatory “danger” receptor.

Integrity signals

Registry

Crossref · 10.1126/science.1156995

Cites

26 of 26 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 35 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    Adding 130 mM KCl to THP1 cultures prevented IL-1β production triggered by asbestos.

    “We inhibited K + efflux by adding high concentrations (130 mM) of KCl to the culture media of THP1 cells and found that asbestos-induced IL-1β production was blocked (Fig. 3A).”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The inhibitors used (cytochalasin D, latrunculin A, KCl, NAC, APDC, DPI, apocynin, deferoxamine, uricase) act specifically on their intended targets without off-target effects that explain the results.
  • Findingcitation

    IL-1β production was independent of the Ipaf inflammasome.

    “By contrast, IL-1β production was independent of the Ipaf inflammasome, which has been shown to activate caspase-1 and produce IL-1β in response to flagellin from Salmonella typhimurium and Legionella pneumophila (fig.S4) (11,12).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [11] source

      Not checked in the free run.

    • cites [12] source

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  • Findingown data

    In primary human monocyte-derived macrophages, DEP did not cause IL-1β release.

    “Primary human monocyte-derived macrophages also produced mature IL-1β after stimulation with asbestos or silica (Fig. 1C), while DEP exposure again did not result in IL-1β secretion.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: THP1 cells and primary human monocyte-derived macrophages respond to particulate stimulation in a way that represents human alveolar macrophages in vivo.
  • Findingown data

    Treatment with NAC or APDC reduced IL-1β release triggered by asbestos, MSU, and ATP.

    “IL-1β production was indeed impaired in response to asbestos, MSU and ATP when using these inhibitors (Fig. 3D), suggesting that ROS production was a necessary step in inflammasome activation.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The inhibitors used (cytochalasin D, latrunculin A, KCl, NAC, APDC, DPI, apocynin, deferoxamine, uricase) act specifically on their intended targets without off-target effects that explain the results.
  • Findingown data

    After asbestos exposure, Nalp3-deficient mice recruited markedly fewer cells to their lungs.

    “However, significantly fewer cells were recruited to the lungs of Nalp3 -/- mice after exposure to asbestos (Fig. 4A).”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The mouse model of asbestos inhalation reflects the human pulmonary inflammatory response sufficiently to infer human disease mechanisms.
    • Rests on an assumption: Nalp3-deficient mice lack Nalp3 inflammasome function without compensatory developmental or immunological alterations that affect the measured outcomes.
  • May combine two claims. 17
  • Classified as probably not a substantial claim. 10
  • May combine two claims.

    Findingown data

    The Nalp3 inflammasome detects both asbestos and silica, and its activation causes IL-1β release.

    “Here, we show that asbestos and silica are sensed by the Nalp3 inflammasome, whose subsequent activation leads to interleukin 1β secretion.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: THP1 cells and primary human monocyte-derived macrophages respond to particulate stimulation in a way that represents human alveolar macrophages in vivo.
  • May combine two claims.

    Findingown data

    DPI and apocynin, which inhibit NADPH oxidase, suppressed ROS production, whereas the mitochondrial inhibitors rotenone and TTFA did not.

    “In support of this, ROS production was inhibited by the NADPH oxidase inhibitors diphenylene iodonium (DPI) and apocynin, but not with rotenone (an inhibitor of mitochondrial complex I) or TTFA (an inhibitor of mitochondrial complex II) (fig.S7).”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The inhibitors used (cytochalasin D, latrunculin A, KCl, NAC, APDC, DPI, apocynin, deferoxamine, uricase) act specifically on their intended targets without off-target effects that explain the results.
  • May combine two claims.

    Findingown data

    In LPS-primed mouse BMDM, zVAD or deficiency in Nalp3 or ASC eliminated caspase-1 cleavage and secretion, and also blocked mature IL-1β processing and release.

    “Caspase-1 was no longer cleaved and secreted in the presence of the pan-caspase inhibitor zVAD or in macrophages from Nalp3 and ASC deficient mice and as a consequence, mature IL-1β processing and secretion was abolished (Fig. 2B).”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Nalp3-deficient mice lack Nalp3 inflammasome function without compensatory developmental or immunological alterations that affect the measured outcomes.
  • May combine two claims.

    Findingown data

    Deferoxamine, which chelates iron from asbestos, markedly decreased IL-1β maturation but did not affect MSU.

    “We observed that iron chelation of asbestos fibres by deferoxamine strongly reduced IL-1β maturation, whereas it had no effect in response to MSU crystals (Fig. 3E).”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The inhibitors used (cytochalasin D, latrunculin A, KCl, NAC, APDC, DPI, apocynin, deferoxamine, uricase) act specifically on their intended targets without off-target effects that explain the results.
  • May combine two claims.

    Findingown data

    In mice inhaling asbestos, loss of Nalp3 reduced inflammatory cell recruitment to the lungs and decreased cytokine production.

    “In a model of asbestos inhalation, Nalp3 -/-mice showed diminished recruitment of inflammatory cells to the lungs, paralleled by lower cytokine production.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The mouse model of asbestos inhalation reflects the human pulmonary inflammatory response sufficiently to infer human disease mechanisms.
    • Rests on an assumption: Nalp3-deficient mice lack Nalp3 inflammasome function without compensatory developmental or immunological alterations that affect the measured outcomes.
  • May combine two claims.

    Findingown data

    Uricase treatment blocked MSU activity but not asbestos.

    “On the other hand, uricase treatment blocked the activity of MSU but not of asbestos.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The inhibitors used (cytochalasin D, latrunculin A, KCl, NAC, APDC, DPI, apocynin, deferoxamine, uricase) act specifically on their intended targets without off-target effects that explain the results.
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The Nalp3 inflammasome has been linked to excessive IL-1β in autoinflammatory conditions like Muckle-Wells syndrome and in inflammatory diseases such as gout and pseudogout.

    “The Nalp3 inflammasome is implicated in the pathological increase of IL-1β production in autoinflammatory syndromes, such as Muckle-Wells syndrome (22), as well as inflammatory processes, such as gout and pseudogout (7).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [22] source

      Not checked in the free run.

    • cites [7] source

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  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Diesel exhaust particles also trigger inflammatory responses.

    “Likewise inflammatory responses are observed after exposure to other particulates such as found in diesel exhaust (5).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [5] source

      Not checked in the free run.

  • May combine two claims.

    Interpretationown data

    The results link the Nalp3 inflammasome to pulmonary diseases caused by particulate matter and support its function as a key proinflammatory danger sensor.

    “Our findings implicate the Nalp3 inflammasome in particulate matter-related pulmonary diseases and support its role as a major proinflammatory”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The mouse model of asbestos inhalation reflects the human pulmonary inflammatory response sufficiently to infer human disease mechanisms.
    • Rests on an assumption: THP1 cells and primary human monocyte-derived macrophages respond to particulate stimulation in a way that represents human alveolar macrophages in vivo.
  • May combine two claims.

    Interpretationown data

    The results support a role for the Nalp3 inflammasome in lung inflammatory diseases caused by harmful airborne particles, which can progress to fibrosis and lung cancer.

    “Our findings support the implication of the Nalp3 inflammasome in pulmonary inflammatory diseases that are linked to pathogenic air pollutants and can ultimately lead to lung cancer and fibrosis.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The mouse model of asbestos inhalation reflects the human pulmonary inflammatory response sufficiently to infer human disease mechanisms.
    • Rests on an assumption: THP1 cells and primary human monocyte-derived macrophages respond to particulate stimulation in a way that represents human alveolar macrophages in vivo.
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Nalp3 can detect endogenous danger signals, including ATP and MSU.

    “In addition to PAMPs, Nalp3 has the extraordinary capacity of sensing endogenous stress-associated danger signals (DAMPs) such as ATP (9) or MSU (7).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [9] source

      Not checked in the free run.

    • cites [7] source

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  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Asbestos inhalation models show that airway epithelial cells and alveolar macrophages are important in the proliferation, inflammation, and fibrosis caused by asbestos fibres.

    “Models of asbestos inhalation have revealed that the airway epithelium and alveolar macrophages play important roles in cell proliferation, inflammation and fibrogenesis triggered by the asbestos fibres (reviewed in (1)).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [1] source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Iron on the surface of crocidolite asbestos makes these fibres especially strong ROS producers, and this iron is believed to contribute to free radical formation.

    “Crocidolite asbestos fibres appear to be particularly potent ROS producers due to the presence of iron on the fibre surface.The iron is thought to play an important role in the generation of free radicals (3).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [3] source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Environmental exposure to asbestos fibres has been linked to malignant mesothelioma.

    “Asbestos fibres have been associated with development of malignant mesotheliomas after environmental exposures (2).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [2] source

      Not checked in the free run.

  • May combine two claims.

    Interpretationown data

    Actin filaments are needed for attempted phagocytosis, but not for the release of mature IL-1β.

    “Since the mature form of IL-1β did not accumulate inside the cell (Fig. 3C), we conclude that the actin cytoskeleton is necessary for the attempt to phagocytose, and not to drive mature IL-1β secretion.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The inhibitors used (cytochalasin D, latrunculin A, KCl, NAC, APDC, DPI, apocynin, deferoxamine, uricase) act specifically on their intended targets without off-target effects that explain the results.
  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation

    Published findings indicate that ROS help activate caspase-1 after ATP treatment and contribute to Nalp3 activation by MSU and R837.

    “Recent data also suggest a role for ROS in activating caspase-1 upon ATP treatment (18) and in Nalp3 inflammasome activation by MSU and R837 (13).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [18] source

      Not checked in the free run.

    • cites [13] source

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  • May combine two claims.

    Premisecitation

    Small particles can be taken up by phagocytic cells, but larger crystals or fibres undergo frustrated phagocytosis and stay at the cell surface.

    “Phagocytic cells can endocytose small particles, whereas bigger crystals or fibres are subject to so-called”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [16]

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Occupational exposure to asbestos or silica can cause lung fibrosis and lung cancer, particularly in smokers.

    “Inhalation of asbestos or silica in occupational exposures can result in pulmonary fibrosis (asbestosis, silicosis), and lung cancer, especially in smokers (1).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [1] source

      Not checked in the free run.

  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation

    IL-1β has been proposed to contribute to asbestos-induced mesothelioma by influencing human mesothelial cell growth, and inflammation driven by IL-1β is known to promote tumour development and invasion in vivo.

    “An important role for IL-1β has been proposed in the pathogenesis of asbestos-induced mesothelioma by regulating human mesothelial cell proliferation (23) and IL-1β-driven inflammation is well known to promote the development and invasiveness of several tumour types in vivo (24).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [23]

      Not checked in the free run.

    • cites [24] source

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  • May combine two claims.

    Premisecitation

    The Nalp3 inflammasome contains Nalp3, Cardinal, ASC, and caspase-1, and has been linked to mature IL-1β generation after diverse stimuli.

    “The Nalp3 inflammasome, composed of the Nod-like receptor (NLR) protein Nalp3 (Cryopyrin/NLRP3), Cardinal, the adaptor ASC and caspase-1, is implicated in the production of mature IL-1β in response to a variety of signals.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [8] source

      Not checked in the free run.

  • May combine two claims.

    Interpretationown data

    Particles such as asbestos and MSU, and likely others, turn on the NALP3 inflammasome through a pathway that needs actin-mediated uptake, unlike small soluble activators like R837, ATP, or nigericin.

    “Asbestos, MSU and probably other particles activate the NALP3 inflammasome in a similar way, requiring actin-mediated cellular uptake in contrast to small, non-particulate molecules such as R837, ATP or nigericin.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: THP1 cells and primary human monocyte-derived macrophages respond to particulate stimulation in a way that represents human alveolar macrophages in vivo.
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Nalp3 detects bacteria through MDP or through bacterial toxins.

    “For example, the presence of bacteria is recognized through binding of the pathogen-associated molecular pattern (PAMP) muramyldipeptide (MDP) or via the action of bacterial toxins (9,10).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [9] source

      Not checked in the free run.

    • cites [10] source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Asbestos fibres can undergo redox reactions that produce ROS, which are associated with inflammatory and carcinogenic signalling.

    “Asbestos fibres have been shown to participate in redox reactions to generate reactive oxygen species (ROS) that are widely linked to signalling pathways causing inflammation and carcinogenesis [reviewed in (17)].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [17] source

      Not checked in the free run.

23 of 23
  • The paper relies on this without support.

    The mouse model of asbestos inhalation reflects the human pulmonary inflammatory response sufficiently to infer human disease mechanisms.

    “To investigate the in vivo significance of the Nalp3 inflammasome in asbestos-induced inflammation, Nalp3 -/-and Nalp3 +/+ littermate mice were exposed for 9 days to chrysotile asbestos and markers of injury, inflammation and cytokine production were analysed on day 10.”
    “Our findings support the implication of the Nalp3 inflammasome in pulmonary inflammatory diseases that are linked to pathogenic air pollutants and can ultimately lead to lung cancer and fibrosis.”
  • The paper relies on this without support.

    The in vitro concentrations and exposure durations of asbestos and silica used in cell culture are relevant to human exposures.

    “THP1 cells were stimulated for 6 h with the indicated amounts (mg/ml media) of asbestos, silica, diesel exhaust particles (DEP), cigarette smoke extract (CSE, in % solution) and MSU.”
    “Primary human monocyte-derived macrophages also produced mature IL-1β after stimulation with asbestos or silica (Fig. 1C)”
  • The paper relies on this without support.

    Nalp3-deficient mice lack Nalp3 inflammasome function without compensatory developmental or immunological alterations that affect the measured outcomes.

    “Nalp3 -/-and Nalp3 +/+ littermate mice were exposed for 9 days to chrysotile asbestos and markers of injury, inflammation and cytokine production were analysed on day 10.”
    “However, significantly fewer cells were recruited to the lungs of Nalp3 -/- mice after exposure to asbestos (Fig. 4A).”
  • The paper relies on this without support.

    The inhibitors used (cytochalasin D, latrunculin A, KCl, NAC, APDC, DPI, apocynin, deferoxamine, uricase) act specifically on their intended targets without off-target effects that explain the results.

    “Cytochalasin D inhibited not only secretion of mature IL-1β by asbestos (Fig. 3C), but also by the particulate MSU, while for non-crystalline Nalp3 activators such as R837 and nigericin, IL-1β secretion was not affected (Fig. 3C).”
    “IL-1β production was indeed impaired in response to asbestos, MSU and ATP when using these inhibitors (Fig. 3D), suggesting that ROS production was a necessary step in inflammasome activation.”
  • The paper relies on this without support.

    THP1 cells and primary human monocyte-derived macrophages respond to particulate stimulation in a way that represents human alveolar macrophages in vivo.

    “We indeed observed that the macrophage-like cell line THP1 secreted mature IL-1β upon stimulation with asbestos or silica (Fig. 1A).”
    “Primary human monocyte-derived macrophages also produced mature IL-1β after stimulation with asbestos or silica (Fig. 1C)”
5 of 5

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The primed NLRP3 inflammasome can be directly activated by ATP, reactive oxygen species, DNA released from damaged mitochondria, protein aggregates, uric acid crystals, ceramide, bacterial or viral RNA, asbestos, silica, decreased intracellular K+ and Cl− concentrations, and Ca2+ flux.

    “In the second, activation step, the now primed NLRP3 inflammasome can be directly activated by any of the various signals including ATP, reactive oxygen species (ROS) and DNA released from damaged mitochondria, protein aggregates, uric acid crystals and ceramide, bacterial or viral RNA, airborne pollutants such as asbestos and silica, decreased intracellular concentrations of K+ and Cl− as well as”

    From Microglial function, INPP5D/SHIP1 signaling, and NLRP3 inflammasome activation: implications for Alzheimer’s disease (2023) · cites this paper as [60]

    The paper’s full text (indexed under Abstract; no page supplied) supports NLRP3 activation in response to asbestos, silica, ATP and monosodium urate crystals, and implicates ROS and reduced intracellular K+ in activation. It does not address mitochondrial DNA, protein aggregates, ceramide, bacterial or viral RNA, reduced Cl−, or Ca2+ flux. It also describes direct interaction with NLRP3 as an unresolved hypothesis, rather than establishing direct activation by the listed signals. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • mtROS serve as direct activators of the NLRP3 inflammasome.

    “These results suggest that mtROS serve as direct activators of the NLRP3 inflammasome.”
  • Treatment with ROS inhibitors suppresses cadmium-, silica-, and asbestos-induced NLRP3 inflammasome activation.

    “Conversely, treatment with ROS inhibitors has been shown to suppress cadmium‐, silica‐, and asbestos‐induced NLRP3 inflammasome activation.37, 38”
  • Inhalation of crystalline silica can induce inflammation by stimulating the NLRP3 inflammasome.

    “Inhalation of crystalline silica can induce inflammation by stimulating the NLRP3 inflammasome, a cytosolic receptor complex that plays a critical role in driving inflammatory immune responses.”
  • Particulate substances or fibers are likely candidates for the initiation of ROS.

    “Particulate substances or fibers are likely candidates for the initiation of ROS (19).”

Cites

Flagged first, then by citations

1 of the 27 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. K. Hansen, B. T. Mossman, Cancer Res.47, 1681 (1987).
  2. Y. Wanget al., Int. J. Oncol.25, 173 (2004).

Cited by

Sorted by citations

Authors
Dostert, C., Pétrilli, V., Van Bruggen, R., Steele, C., Mossman, B. T., & Tschopp, J.
Affiliations
  • University of Vermont (US)
  • Department of Biochemistry, University of Lausanne, Chemin des Boveresses 155, 1066 Epalinges, Switzerland.
Venue
Science
Published
2008-05-02
Volume
320
Issue
5876
Pages
674-677
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2009004909
Cited by
2,658
References
27
Citations by year
2026: 57 · 2025: 76 · 2024: 126 · 2023: 121 · 2022: 131 · 2021: 140 · 2020: 168 · 2019: 154 · 2018: 154 · 2017: 166 · 2016: 168 · 2015: 169 · 2014: 187 · 2013: 192 · 2012: 171
FWCI
64.93
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • IRIS (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Pure Amsterdam UMC (submittedVersion)
  • SERVAL (Université de Lausanne) (submittedVersion, other-oa)
Funders
  • National Institutes of Health (5p01ca114047-05)
  • National Heart, Lung, and Blood Institute (P01HL067004, P01 HL67004)
  • National Cancer Institute (P01CA-114047)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Occupational and environmental lung diseases
Keywords
NLRP3 inflammasome, asbestos, silica, innate immune activation, IL-1β, reactive oxygen species, NADPH oxidase, phagocytosis, lung inflammation, pulmonary fibrosis, lung cancer, particulate matter
MeSH terms
NLR Family, Pyrin Domain-Containing 3 Protein, Animals, Asbestos, Carrier Proteins, Humans, Immunity, Inflammation, Macrophages, Silicon Dioxide, Inflammation Mediators, Mice, Interleukin-1beta

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