PYCARD

PYCARD (PYD and CARD domain-containing protein), commonly known as ASC (Apoptosis-associated speck-like protein containing a CARD) or TMS1, is a conserved adaptor protein with an N-terminal PYD and a C-terminal CARD domain. It bridges pattern recognition receptors (e.g., NLRP3, AIM2) and pro-caspase-1 via homotypic interactions, driving inflammasome assembly, caspase-1 activation, and maturation of pro-inflammatory cytokines IL-1β and IL-18; it also regulates apoptosis and NF-κB signaling.
Dysregulated PYCARD-driven inflammasome activity underpins autoinflammatory disorders, rheumatoid arthritis, neurodegenerative diseases, and cancer. Targeting PYCARD-inflammasome signaling has emerged as a promising therapeutic strategy; small-molecule inhibitors, antisense oligonucleotides, and peptide-based agents are under preclinical and early clinical investigation to modulate its adaptor function and curb excessive inflammation。