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Caspase-8 functions as a key mediator of inflammation and pro-IL-1β processing via both canonical and non-canonical

Tom P Monie1, Clare E Bryant

  • 1Department of Veterinary Medicine, University of Cambridge, Cambridge, UK.

Immunological Reviews
|April 17, 2015
PubMed

Insights

Caspase-8 (cell death protein) regulates apoptosis and necroptosis, and is vital for inflammatory responses. Its dual role in cell death and inflammation highlights its importance in cellular health and disease.

Area of Science:

  • Cell Biology
  • Immunology
  • Molecular Biology

Background:

  • Caspase-8 is a key regulator of programmed cell death, controlling apoptosis and necroptosis.
  • Genetic ablation of Caspase-8 leads to embryonic lethality due to uncontrolled necroptosis, which can be rescued by deleting RIPK3.
  • Emerging evidence links Caspase-8 to inflammatory pathways, particularly IL-1β processing.

Purpose of the Study:

  • To review the multifaceted roles of Caspase-8 in cellular inflammation.
  • To elucidate the interplay between Caspase-8 and inflammasome pathways (canonical and non-canonical).

Main Methods:

  • Literature review of studies on Caspase-8, apoptosis, necroptosis, and inflammasomes.
  • Analysis of genetic and molecular mechanisms underlying Caspase-8 function in cell death and inflammation.

Main Results:

  • Caspase-8 activation promotes apoptosis while suppressing RIPK3-mediated necroptosis.
  • Caspase-8 is essential for the induction of pro-IL-1β synthesis and processing through both canonical and non-canonical inflammasome pathways.
  • Genetic deletion of Caspase-8 results in embryonic lethality rescued by RIPK3 deletion, underscoring its critical role in balancing cell death pathways.

Conclusions:

  • Caspase-8 plays a critical dual role in orchestrating cell death and inflammation.
  • Understanding Caspase-8's interaction with inflammasomes is crucial for developing therapeutic strategies targeting inflammatory diseases.
Keywords:
apoptosiscaspasedeath receptorinflammasomeinterleukin-1βsignal transduction

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