NOD-like receptor protein 3 (NLRP3) inflammasome complex (NLRP3 inflammasome)

The NOD-like receptor protein 3 (NLRP3) inflammasome complex is a critical multiprotein signaling platform of the innate immune system that senses a wide range of microbial, metabolic, and environmental danger signals [1, 3, 7]. It is composed of the NLRP3 sensor protein, the adaptor protein ASC (apoptosis-associated speck-like protein containing a CARD), and the effector enzyme pro-caspase-1 [3, 12]. Upon activation by stimuli such as potassium efflux, mitochondrial dysfunction, or lysosomal rupture, these components assemble into a large macromolecular complex that facilitates the autocatalytic activation of caspase-1 [2, 9, 12]. Active caspase-1 then processes the pro-inflammatory cytokines interleukin-1 beta (IL-1β) and interleukin-18 (IL-18) into their mature, secreted forms and triggers pyroptosis, a form of programmed inflammatory cell death [1, 2, 12]. Dysregulation or chronic activation of the NLRP3 inflammasome is a key driver in the pathogenesis of numerous inflammatory and metabolic diseases, including cryopyrin-associated periodic syndromes (CAPS), gout, type 2 diabetes, atherosclerosis, and neurodegenerative disorders like Alzheimer's disease [1, 4, 5, 16]. Consequently, the NLRP3 inflammasome has emerged as a high-priority therapeutic target, with various small-molecule inhibitors designed to block its assembly or enzymatic activity currently in clinical development [7, 10, 12]. These drugs, such as MCC950 and dapansutrile, aim to prevent the excessive production of inflammatory mediators while preserving other arms of the immune system [7, 12].

Other names

NLRP3 complexCryopyrin inflammasomeNALP3 inflammasomeNLRP3-ASC-Caspase-1 complexNOD-like receptor protein 3 inflammasome

Direct inhibition of the NLRP3 NACHT domain ATPase activity, stabilization of the inactive NLRP3 conformation, and prevention of ASC recruitment and oligomerization.