NOD-like receptor pyrin domain-containing protein 3 inflammasome complex (NLRP3 inflammasome)

The NOD-like receptor pyrin domain-containing protein 3 (NLRP3) inflammasome complex is a multiprotein assembly in the cytosol that acts as an essential sensor and effector platform for innate immunity. Upon detection of microbial, chemical, and cellular danger signals (PAMPs and DAMPs), NLRP3 oligomerizes, recruiting ASC (an adaptor with pyrin and caspase recruitment domains) and procaspase-1 to form the functional inflammasome. This activates caspase-1, leading to cleavage and release of proinflammatory cytokines IL-1β and IL-18, and initiates pyroptotic cell death via gasdermin D processing. The complex is tightly regulated and has a central role in host defense, but dysregulation drives a range of inflammatory, infectious, and metabolic diseases. Therapeutic targeting of NLRP3 aims to modulate this overactivation, but safety and specificity remain challenges in drug development. Structural studies reveal that NLRP3 consists of an N-terminal pyrin domain (PYD), a central nucleotide-binding NACHT domain for oligomerization, and a C-terminal leucine-rich repeat (LRR) domain for autoinhibition and scaffold assembly. The assembly of the NLRP3 inflammasome is increasingly elucidated by cryo-EM structures, identifying druggable sites for clinical intervention.

Other names

NLRP3 inflammasomeNOD-, LRR-, and pyrin domain-containing protein 3 inflammasomeCryopyrin inflammasomeNALP3 inflammasomeNLRP3 complex

Drugs target NLRP3 inflammasome by: - Direct inhibition of NLRP3 protein’s ATPase activity (e.g., MCC950) - Blocking upstream priming or assembly (e.g., glyburide, dapansutrile) - Inhibiting oligomerization and disc formation of inflammasome complex - Suppressing downstream cytokine release (IL-1β, IL-18) and pyroptosis