Tetramethylpyrazine alleviates acute pancreatitis inflammation by inhibiting pyroptosis via the NRF2 pathway.

OBJECTIVE

Tetramethylpyrazine (TMPZ), an active alkaloid derived from traditional Chinese medicine, has shown anti-inflammatory and anti-pyroptotic properties. However, its role in acute pancreatitis (AP)-induced pyroptosis remains unclear. This study aims to investigate the effects of TMPZ on AP-induced pyroptosis and its potential mechanisms.

MATERIALS AND METHODS

A cerulein-induced AP rat model was used to evaluate TMPZ's protective effects , and its mechanisms were explored using AR42J cells . Pancreatic injury was assessed by hematoxylin-eosin staining, TUNEL assay, and serum biochemistry. Transmission electron microscopy, immunofluorescence, Western blotting, and quantitative real-time polymerase chain reaction (RT-qPCR) were conducted to examine pyroptosis and related signaling pathways. Cytotoxicity and apoptosis were measured by CCK-8, LDH assays, and Hoechst 33342/PI staining. The role of NRF2 in TMPZ's effects was further evaluated using NRF2 siRNA.

RESULTS

TMPZ alleviated pancreatic histopathological damage, reduced apoptosis, and decreased serum amylase levels and pro-inflammatory cytokines (IL-1β, IL-18). TMPZ also suppressed pyroptosis by inhibiting NLRP3 inflammasome activation and downregulating pyroptosis-related proteins (NLRP3,caspase-1, ASC, GSDMD) while upregulating NRF2 and HO-1 expression. NRF2 siRNA attenuated TMPZ's anti-inflammatory and pyroptosis-inhibitory effects, confirming the involvement of the NRF2 pathway.

CONCLUSION

TMPZ mitigates AP-induced inflammation and injury by modulating pyroptosis via the NRF2 signaling pathway. These findings suggest TMPZ's therapeutic potential for AP.