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Journal Article
Research Support, Non-U.S. Gov't
Review
Potassium efflux fires the canon: Potassium efflux as a common trigger for canonical and noncanonical NLRP3 pathways.
European Journal of Immunology 2015 October
Murine caspase-11 and its human orthologues, caspase-4 and caspase-5, activate an inflammatory response following cytoplasmic recognition of cell wall constituents from Gram-negative bacteria, such as LPS. This inflammatory response involves pyroptotic cell death and the concomitant release of IL-1α, as well as the production of IL-1β and IL-18 through the noncanonical NLR family, pyrin domain containing 3 (NLRP3) pathway. This commentary discusses three papers in this issue of the European Journal of Immunology that advance our understanding of the roles of caspase-11, -4, and -5 in the noncanonical pathway. By utilizing the new gene editing technique, clustered regularly interspaced short palindromic repeats (CRISPR), as well as sensitive cell imaging techniques, these papers establish that cytoplasmic LPS-dependent IL-1β production requires the NLRP3 inflammasome and that its activation is dependent on K(+) efflux, whereas IL-1α release and pyroptotic cell death pathways are NLRP3-independent. These findings expand on previous research implicating K(+) efflux as the principal trigger for NLRP3 activation and suggest that canonical and noncanonical NLRP3 pathways are not as dissimilar as first thought.
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