Cryopyrin (Nalp3), a protein encoded by the CIAS1 gene, plays a critical role in the activation of caspase-1 and the production of pro-inflammatory cytokines IL-1β and IL-18 in response to bacterial RNA and the imidazoquinoline compounds R837 and R848. Mutations in CIAS1 are associated with three autoinflammatory disorders: familial cold autoinflammatory syndrome, Muckle-Wells syndrome, and neonatal-onset multiple-system inflammatory disease. Cryopyrin forms a multi-protein complex called the inflammasome, which includes ASC and caspase-1, and is essential for caspase-1 activation and processing of pro-IL-1β. However, cryopyrin is not required for the production of TNF-α and IL-6 or the activation of NF-κB and MAPKs in response to these stimuli. The study shows that cryopyrin is specifically required for the secretion of IL-1β and IL-18 induced by R837 and R848. These compounds activate the inflammasome through different intracellular pathways, with cryopyrin and TLRs playing distinct roles. Bacterial RNA also activates caspase-1 and IL-1β secretion, and these events are mediated through cryopyrin and ASC, independent of TLR7 and MyD88. Cryopyrin is essential for caspase-1 processing, independent of NF-κB and MAPK activation in response to R837 and R848. The study also shows that LPS synergizes with R837 to enhance IL-1β production, and this synergy is dependent on cryopyrin. These findings highlight the critical role of cryopyrin in host defense through bacterial RNA-mediated activation of caspase-1 and provide insights into the pathogenesis of autoinflammatory syndromes. The results suggest that cryopyrin is involved in immune responses to microbial structures, and its activation by bacterial RNA may be due to recognition of RNA by cryopyrin. The study also indicates that imidazoquinoline compounds like R837 and R848 can activate both TLR and cryopyrin signaling, contributing to their potent adjuvant, antiviral, and antitumor activities.Cryopyrin (Nalp3), a protein encoded by the CIAS1 gene, plays a critical role in the activation of caspase-1 and the production of pro-inflammatory cytokines IL-1β and IL-18 in response to bacterial RNA and the imidazoquinoline compounds R837 and R848. Mutations in CIAS1 are associated with three autoinflammatory disorders: familial cold autoinflammatory syndrome, Muckle-Wells syndrome, and neonatal-onset multiple-system inflammatory disease. Cryopyrin forms a multi-protein complex called the inflammasome, which includes ASC and caspase-1, and is essential for caspase-1 activation and processing of pro-IL-1β. However, cryopyrin is not required for the production of TNF-α and IL-6 or the activation of NF-κB and MAPKs in response to these stimuli. The study shows that cryopyrin is specifically required for the secretion of IL-1β and IL-18 induced by R837 and R848. These compounds activate the inflammasome through different intracellular pathways, with cryopyrin and TLRs playing distinct roles. Bacterial RNA also activates caspase-1 and IL-1β secretion, and these events are mediated through cryopyrin and ASC, independent of TLR7 and MyD88. Cryopyrin is essential for caspase-1 processing, independent of NF-κB and MAPK activation in response to R837 and R848. The study also shows that LPS synergizes with R837 to enhance IL-1β production, and this synergy is dependent on cryopyrin. These findings highlight the critical role of cryopyrin in host defense through bacterial RNA-mediated activation of caspase-1 and provide insights into the pathogenesis of autoinflammatory syndromes. The results suggest that cryopyrin is involved in immune responses to microbial structures, and its activation by bacterial RNA may be due to recognition of RNA by cryopyrin. The study also indicates that imidazoquinoline compounds like R837 and R848 can activate both TLR and cryopyrin signaling, contributing to their potent adjuvant, antiviral, and antitumor activities.