Nucleotide-binding oligomerization domain-like receptor family pyrin domain containing 3 (NLRP3) inflammasome (NLRP3 inflammasome)

The Nucleotide-binding oligomerization domain-like receptor family pyrin domain containing 3 (NLRP3) inflammasome is a cytosolic multiprotein complex that acts as a key sensor in the innate immune system (1.1.2, 1.4.2). It is composed of three primary components: the NLRP3 sensor protein, the apoptosis-associated speck-like protein containing a CARD (ASC) adaptor, and the pro-caspase-1 effector, with NIMA-related kinase 7 (NEK7) serving as an essential scaffolding protein for its activation (1.1.1, 1.2.2, 1.5.2). Activation of the NLRP3 inflammasome typically follows a two-step model involving a priming signal (e.g., via TLRs) and an activation signal (e.g., potassium efflux or mitochondrial stress) (1.3.1, 1.5.2). Once assembled, the complex activates caspase-1, which processes the precursors of interleukin-1 beta (IL-1β) and interleukin-18 (IL-18) into their active forms and triggers pyroptosis, a proinflammatory form of cell death (1.1.1, 1.4.1). Aberrant activation of this pathway is linked to numerous chronic inflammatory, metabolic, and neurodegenerative conditions, including gout, type 2 diabetes, and Alzheimer's disease (1.1.2, 1.5.3). Consequently, the NLRP3 inflammasome is a major therapeutic target, with various small molecules like MCC950 and biologics like canakinumab in development or use to inhibit its assembly or neutralize its downstream products (1.4.2, 1.5.1).

Other names

CryopyrinCIAS1PYPAF1NALP3NLRP3 complexCaspase recruitment domain-containing protein 7

Direct inhibition of NLRP3 ATPase activity, prevention of NLRP3 oligomerization, inhibition of caspase-1 activation, neutralization of downstream cytokines (IL-1β, IL-18), and inhibition of the priming signal (NF-κB) (1.3.1, 1.4.1, 1.5.1).