Cross-Talk Between Pyroptosis and Ferroptosis Promotes Intestinal Inflammation and Barrier Failure During PEDV Infection.

Porcine epidemic diarrhea virus (PEDV) causes lethal enteritis in neonatal piglets, yet the mechanisms underlying rapid intestinal injury remain unclear. In particular, it is unknown whether different regulated cell death pathways act separately or cooperatively to worsen mucosal damage. To address this question, we performed multi-omics analyses of infected intestinal tissues and found concurrent activation of pyroptosis and ferroptosis during PEDV infection. PEDV infection activated the Caspa-se-1/GSDMD pathway in the duodenum and jejunum, as shown by generation of the Caspase-1 p20 fragment and cleavage of GSDMD into its active N-terminal form, indicating pyroptosis. At the same time, infected tissues displayed key features of ferroptosis, including weakened antioxidant defenses, increased lipid peroxidation, iron accumulation, lipid remodeling, and dysregulated ACSL4 and GPX4 expression. These two processes were closely linked and together contributed to tight junction disruption and barrier instability. Molecular docking further suggested that PEDV NSP1 and S proteins may interact with Caspase-1, providing a possible explanation for pyroptosis induction. Correlation analysis also showed strong associations between pyroptosis-related genes and ferroptosis-associated metabolites. Overall, our findings indicate that pyroptosis and ferroptosis cooperate to drive PEDV-induced intestinal inflammation and barrier damage, highlighting their joint inhibition as a potential strategy to reduce PEDV pathogenicity.