Silica and aluminum salts activate the NALP3 inflammasome through phagosomal destabilization. The study shows that silica and aluminum salt crystals induce NALP3 inflammasome activation by being phagocytosed, leading to lysosomal damage and rupture. This lysosomal damage is sufficient to trigger NALP3 activation, independent of crystal structure. The process requires phagocytosis, lysosomal acidification, and the lysosomal protease cathepsin B. Lysosomal damage, whether from crystal ingestion or other means, activates the NALP3 inflammasome, leading to the processing and secretion of IL-1β and caspase-1 activation. This mechanism is conserved across various crystal types, including monosodium urate and calcium pyrophosphate dihydrate, which are known to trigger inflammation in gout and pseudogout. Aluminum salts, commonly used as vaccine adjuvants, also activate the NALP3 inflammasome through similar mechanisms. The study highlights that lysosomal damage is sensed by the immune system as an endogenous danger signal, leading to the release of inflammatory cytokines and subsequent tissue inflammation. These findings suggest that the NALP3 inflammasome plays a critical role in sensing and responding to lysosomal damage, which can be induced by various stimuli, including crystalline materials. This understanding may lead to new therapeutic strategies for diseases associated with NALP3 inflammasome activation.Silica and aluminum salts activate the NALP3 inflammasome through phagosomal destabilization. The study shows that silica and aluminum salt crystals induce NALP3 inflammasome activation by being phagocytosed, leading to lysosomal damage and rupture. This lysosomal damage is sufficient to trigger NALP3 activation, independent of crystal structure. The process requires phagocytosis, lysosomal acidification, and the lysosomal protease cathepsin B. Lysosomal damage, whether from crystal ingestion or other means, activates the NALP3 inflammasome, leading to the processing and secretion of IL-1β and caspase-1 activation. This mechanism is conserved across various crystal types, including monosodium urate and calcium pyrophosphate dihydrate, which are known to trigger inflammation in gout and pseudogout. Aluminum salts, commonly used as vaccine adjuvants, also activate the NALP3 inflammasome through similar mechanisms. The study highlights that lysosomal damage is sensed by the immune system as an endogenous danger signal, leading to the release of inflammatory cytokines and subsequent tissue inflammation. These findings suggest that the NALP3 inflammasome plays a critical role in sensing and responding to lysosomal damage, which can be induced by various stimuli, including crystalline materials. This understanding may lead to new therapeutic strategies for diseases associated with NALP3 inflammasome activation.