CASP1 and rheumatoid arthritis: Furthermore, deletion of NLRP3, caspase-1 and the interleukin-1 receptor markedly protected against rheumatoid-arthritis-associated inflammation and cartilage destruction in A20myel-KO mice and the authors depicted A20 as a novel negative regulator of NLRP3 inflammasome activation in rheumatoid arthritis [91].