[No authors listed]
NLRP3 is an important pattern recognition receptor involved in mediating inflammasome activation in response to viral and bacterial infections as well as various proinflammatory stimuli associated with tissue damage or malfunction. Upon activation, NLRP3 assembles a multimeric inflammasome complex comprising the adaptor ASC and the effector pro-caspase-1 to mediate the activation of caspase-1. Although NLRP3 expression is induced by the NF-κB pathway, the posttranscriptional molecular mechanism controlling the activation of NLRP3 remains elusive. Using both pharmacological and molecular approaches, we show that the activation of NLRP3 inflammasome is regulated by a deubiquitination mechanism. We further identify the deubiquitinating enzyme, BRCC3, as a critical regulator of NLRP3 activity by promoting its deubiquitination and characterizing NLRP3 as a substrate for the cytosolic BRCC3-containing BRISC complex. Our results elucidate a regulatory mechanism involving BRCC3-dependent NLRP3 regulation and highlight NLRP3 ubiquitination as a potential therapeutic target for inflammatory diseases.
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