Cited by 1,026Inflammasome and immune disordersCell death mechanisms and regulationImmune Response and Inflammation

The pyroptosome: a supramolecular assembly of ASC dimers mediating inflammatory cell death via caspase-1 activation

Open access
Fernandes-Alnemri, T, Wu, J, Yu, J-W, Datta, P, Miller, B, Jankowski, W, Rosenberg, S, Zhang, J +1 more·2007·Cell Death & Differentiation

Abstract

Pyroptosis is a caspase-1-dependent inflammatory form of cell death. The adapter protein ASC binds directly to caspase-1 and is critical for caspase-1 activation in response to a broad range of stimuli. To elucidate the mechanism of activation of caspase-1 by ASC and its exact role in macrophage pyroptosis, we performed time-lapse confocal bioimaging analysis on human THP-1 macrophages stably expressing an ASC-GFP fusion protein. We show that stimulation of these cells with several proinflammatory stimuli trigger the formation of a large supramolecular assembly of ASC, termed here pyroptosome. Only one distinct pyroptosome in each stimulated cell is formed, which rapidly recruits and activates caspase-1 resulting in pyroptosis and the release of the intracellular proinflammatory cytokines. The pyroptosome is largely composed of oligomerized ASC dimers. Dimerization of ASC is driven by subphysiological concentrations of potassium as in vitro incubation of purified recombinant ASC in the presence of subphysiological concentrations of potassium induces the assembly of a functional pyroptosome. Furthermore, stimulation of potassium efflux in THP-1 cells with potassium-depleting agents induces formation of the pyroptosome, while increasing potassium concentrations in the culture medium or pharmacological inhibition of this efflux inhibits its assembly. Our results establish that macrophage pyroptosis is mediated by a unique pyroptosome, distinct from the inflammasome.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1038/sj.cdd.4402194

Cites

43 of 43 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

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?

  • Inflammasome activation can lead to pyroptosis, although sublethal inflammasome activation can also occur.

    “Inflammasome activation can lead to a form of cell death called pyroptosis, although sublethal inflammasome activation can also occur [64, 65].”
  • Lowering intracellular K+ through efflux is required for Nalp3 activation by every known activator, including MSU.

    “In favour of the latter assumption is the recent finding that potassium (K + ) efflux, lowering intracellular K + levels, is a requirement for Nalp3 inflammasome activation triggered by all known activators including MSU (13)(14)(15).”
  • NLRP3 inflammasome formation elicits self-cleavage of procaspase-1, generating active caspase-1 and converting IL-1β and IL-18 to active forms that are secreted from activated immune cells.

    “Formation of this complex elicit the self-cleavage of procaspase-1, generating the active caspase 1 and inducing the conversion of proinflammatory cytokines such as interleukin 1 beta (IL-1β) and interleukin 18 (IL-18) in their active forms, that will be secreted from activated immune cells (Figure 3B) [134,135].”

    From P2X7 Receptor Signaling in Stress and Depression (2019) · cites this paper as [135]

  • Release of PAMPs and DAMPs causes an opening in NLRP3, allowing interaction between the PYD domain in NLRP3 and ASC.

    “the release of PAMPs and DAMPs, causing an opening in NLRP3, which allows the interaction between the PYD domain in NLRP3 and ASC.”

    From P2X7 Receptor Signaling in Stress and Depression (2019) · cites this paper as [135]

  • The CARD of ASC binds to the CARD of procaspase-1, forming the NLRP3 inflammasome.

    “Subsequently, the caspase recruitment domain (CARD) of ASC binds to the CARD of procaspase-1, originating the NLRP3 inflammasome.”

    From P2X7 Receptor Signaling in Stress and Depression (2019) · cites this paper as [135]

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Fernandes-Alnemri, T., Wu, J., Yu, J.-W., Datta, P., Miller, B., Jankowski, W., Rosenberg, S., Zhang, J., & Alnemri, E. S.
Affiliations
Thomas Jefferson University (US)
Corresponding author
Alnemri, E S
Venue
Cell Death & Differentiation
Published
2007-06-29
Volume
14
Issue
9
Pages
1590-1604
ISSN
  • 1350-9047 (ISSN-L)
  • 1476-5403
OpenAlex
W2067043938
Cited by
1,026
References
43
Citations by year
2026: 33 · 2025: 46 · 2024: 61 · 2023: 77 · 2022: 77 · 2021: 69 · 2020: 60 · 2019: 61 · 2018: 55 · 2017: 64 · 2016: 62 · 2015: 59 · 2014: 60 · 2013: 57 · 2012: 40
FWCI
14.95
Type
journal article
Language
en
Open access
Locations
  • Cell Death and Differentiation (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • YUHSpace (Yonsei University Medical Library) (submittedVersion, cc-by-nc-nd)
Funders
  • National Institutes of Health (CA78890)
  • National Institute on Aging (AG14357, R01AG014357)
  • National Cancer Institute (CA78890, P01CA078890)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
pyroptosis, ASC, caspase-1 activation, macrophage cell death, potassium efflux, supramolecular self-assembly, THP-1 macrophages, inflammasome
MeSH terms
Cytoskeletal Proteins, Enzyme Activation, Humans, Inflammation, Lipopolysaccharides, Macrophages, Potassium, Recombinant Fusion Proteins, Apoptosis, Microscopy, Confocal, Dimerization, Caspase 1, Adaptor Proteins, Signal Transducing

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review