NLR family pyrin domain-containing protein 3 inflammasome (NLRP3 inflammasome)

The NLRP family pyrin domain-containing protein 3 inflammasome (NLRP3 inflammasome) is a cytosolic multiprotein complex that plays a central role in the innate immune system. It acts as a sensor for diverse pathogen-associated molecular patterns (PAMPs) and danger-associated molecular patterns (DAMPs), including microbial components, crystalline substances like uric acid or cholesterol crystals, environmental irritants such as asbestos or silica, extracellular ATP, mitochondrial dysfunction signals, and more. Upon activation through a two-step process involving priming via NF-kB signaling followed by assembly triggered by cellular stressors or damage signals, the NLRP3 inflammasome recruits adaptor ASC and pro-caspase‑1. This leads to caspase‑1 activation which cleaves pro-inflammatory cytokines pro‑IL‑1β and pro‑IL‑18 into their active forms. The resulting inflammatory cascade is essential for host defense but can also drive pathological inflammation implicated in diseases such as gout, type 2 diabetes complications, neurodegeneration, cardiovascular disorders like atherosclerosis, autoimmune conditions—and is thus considered an important therapeutic target for anti-inflammatory drug development.

Other names

NLRP3 complexCryopyrin inflammasomeNACHT, LRR and PYD domains-containing protein 3 inflammasomeNALP3 inflammasome

– Direct inhibition of NLRP3 oligomerization/activation – Blockade of ATPase activity in the NACHT domain – Disruption of ASC recruitment or speck formation – Suppression of upstream priming signals via NF-kB pathway inhibition