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Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
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Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells

Published on: May 22, 2014

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Potassium efflux fires the canon: Potassium efflux as a common trigger for canonical and noncanonical NLRP3 pathways

Jack Rivers-Auty1, David Brough1

  • 1Faculty of Life Sciences, University of Manchester, Manchester, UK.

European Journal of Immunology
|September 3, 2015
PubMed

Insights

Caspase-11 and its human counterparts activate inflammation via Gram-negative bacteria components. New research shows IL-1β production needs NLRP3 inflammasome and K+ efflux, while IL-1α release and cell death are independent.

Area of Science:

  • Immunology
  • Cell Biology
  • Microbiology

Background:

  • Caspase-11 (murine) and caspase-4/5 (human) recognize Gram-negative bacterial LPS in the cytoplasm.
  • This recognition triggers inflammatory responses, including pyroptosis and cytokine release (IL-1α, IL-1β, IL-18) via the noncanonical NLRP3 inflammasome pathway.

Purpose of the Study:

  • To elucidate the distinct roles of caspase-11, -4, and -5 in the noncanonical inflammatory pathway.
  • To investigate the specific requirements for IL-1β production, IL-1α release, and pyroptotic cell death.

Main Methods:

  • Utilized clustered regularly interspaced short palindromic repeats (CRISPR) gene editing.
  • Employed sensitive cell imaging techniques.

Main Results:

  • Cytoplasmic LPS-dependent IL-1β production requires the NLRP3 inflammasome and is dependent on K+ efflux.
  • IL-1α release and pyroptotic cell death are independent of the NLRP3 inflammasome.
  • K+ efflux is confirmed as a principal trigger for NLRP3 activation.

Conclusions:

  • The noncanonical inflammasome pathway exhibits distinct mechanisms for IL-1β production versus IL-1α release and pyroptosis.
  • Canonical and noncanonical NLRP3 inflammasome activation pathways share similarities, particularly regarding K+ efflux as a trigger.
Keywords:
Caspase-11Caspase-4Caspase-5LPSNLRP3 inflammasomeNoncanonicalPyroptosis

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