ObjectivesSevere acute pancreatitis (SAP) is the most serious subtype of acute pancreatitis, manifested as multiple-organ failure resulting in high morbidity and mortality. Based on the role of tripartite motif-containing protein 29 (TRIM29) in immune responses, we aimed to explore its effect on SAP.MethodsPeripheral blood monocyte cells from the SAP or non-SAP patients, as well as bone marrow–derived macrophages from wild-type, TRIM29−/−, or stimulator of interferon genes (STING)−/− mice after injecting 50 mg/kg of cerulein to induce SAP, were isolated to analyze the role of TRIM29 and STING in the SAP.ResultsTripartite motif-containing protein 29 was significantly reduced in SAP patients. Compared with wild-type mice, TRIM29 deficiency mice displayed more severe symptom of acute pancreatitis after cerulein injection, which were lost in TRIM29−/−STING−/− mice. Moreover, interferon and its related genes, as well as STING degradation, were decreased in TRIM29−/− mice.ConclusionsOur study demonstrated that TRIM29 negatively regulated the severity of SAP by degrading STING at its downstream, suggesting that TRIM29 and STING might serve as therapeutic targets for SAP.