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Nat Immunol. 2008 Aug;9(8):866-72. doi: 10.1038/ni.1633. Epub 2008 Jul 6.

Superoxide dismutase 1 regulates caspase-1 and endotoxic shock.

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  • 1Department of Cellular Microbiology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.

Abstract

Caspase-1 serves an essential function in the initiation of inflammation by proteolytically maturing the cytokines interleukin 1 beta and interleukin 18. Several Nod-like receptors activate caspase-1 in response to microbial and 'danger' signals by assembling cytosolic protein complexes called 'inflammasomes'. We show here that superoxide dismutase 1 (SOD1) regulates caspase-1 activation. In SOD1-deficient macrophages, higher superoxide production decreased the cellular redox potential and specifically inhibited caspase-1 by reversible oxidation and glutathionylation of the redox-sensitive cysteine residues Cys397 and Cys362. Conversely, hypoxic conditions abrogated caspase-1 inhibition. In vivo, SOD1-deficient mice produced less caspase-1-dependent cytokines and were less susceptible to lipopolysaccharide-induced septic shock. Our findings identify a physiological post-translational mechanism in the control of caspase-1-mediated inflammatory processes.

PMID:
18604212
[PubMed - indexed for MEDLINE]
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