NLRP3 inflammasome

The NLRP3 inflammasome is a multiprotein cytosolic complex — composed of the sensor protein NLRP3, the adaptor ASC and pro-caspase-1 — that assembles in response to a broad range of danger signals including ATP, uric acid crystals, cholesterol crystals, saturated fatty acids and mitochondrial ROS. Upon assembly, the complex drives auto-proteolytic caspase-1 activation, which in turn cleaves pro-IL-1β and pro-IL-18 into their mature secreted forms and cleaves gasdermin D to initiate pyroptosis. NLRP3 inflammasome activity increases with age in multiple tissues, contributes to inflammaging and is mechanistically linked to atherosclerosis, type 2 diabetes, gout and Alzheimer's disease; clinical trials are evaluating novel selective small-molecule NLRP3 inhibitors (e.g. MCC950 analogues, inzomelid) and downstream IL-1β antagonists such as canakinumab, as well as colchicine — which suppresses NLRP3-driven inflammation indirectly via microtubule disruption rather than selective NLRP3 blockade — in several of these conditions.