CASP1 and rheumatoid arthritis: Another study by Joosten et al. investigated the role of caspase-1, the downstream effector of inflammasomes, in the development of rheumatoid arthritis and obtained conflictive results showing no effect of caspase 1 deficiency in a model of acute (neutrophil-dominated) arthritis but reduced joint inflammation and cartilage destruction in a mouse model of chronic arthritis [90].