Abstract
Objective
Nafamostat mesilate (NM), a synthetic broad-spectrum serine protease inhibitor, has been commonly used for treating acute pancreatitis (AP) and other inflammatory-associated diseases in some East Asia countries. Although the potent inhibitory activity against inflammation-related proteases (such as thrombin, trypsin, kallikrein, plasmin, coagulation factors, and complement factors) is generally believed to be responsible for the anti-inflammatory effects of NM, the precise target and molecular mechanism underlying its anti-inflammatory activity in AP treatment remain largely unknown.
Methods
The protection of NM against pancreatic injury and inhibitory effect on the NOD-like receptor protein 3 (NLRP3) inflammasome activation were investigated in an experimental mouse model of AP. To decipher the molecular mechanism of NM, the effects of NM on nuclear factor kappa B (NF-κB) activity and NF-κB mediated NLRP3 inflammasome priming were examined in lipopolysaccharide (LPS)-primed THP-1 cells. Additionally, the potential of NM to block the activity of histone deacetylase 6 (HDAC6) and disrupt the association between HDAC6 and NLRP3 was also evaluated.
Results
NM significantly suppressed NLRP3 inflammasome activation in the pancreas, leading to a reduction in pancreatic inflammation and prevention of pancreatic injury during AP. NM was found to interact with HDAC6 and effectively inhibit its function. This property allowed NM to influence HDAC6-dependent NF-κB transcriptional activity, thereby blocking NF-κB-driven transcriptional priming of the NLRP3 inflammasome. Furthermore, NM exhibited the potential to interfere the association between HDAC6 and NLRP3, impeding HDAC6-mediated intracellular transport of NLRP3 and ultimately preventing NLRP3 inflammasome activation.
Conclusions
Our current work has provided valuable insight into the molecular mechanism underlying the immunomodulatory effect of NM in the treatment of AP, highlighting its promising application in the prevention of NLRP3 inflammasome-associated inflammatory pathological damage.
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Availability of data and materials
All data generated or analyzed during this study are included in this published article and its supplementary information files.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. 82170660; 81570582) and Natural Science Foundation of Sichuan Province of China (No. 2022NSFSC0825).
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J-DR secured the funding for the study. PC, L-JZ, and J-DR designed the experiments. PC, L-JZ, LH, W-QH, and Y-RT performed experiments and analyzed data. YL provided technical assistance in the experiments and revised the manuscript. J-DR drafted the manuscript. All authors read and approved the final manuscript.
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The animal care and experimental protocols were approved by IACUC of the University of Electronic Science and Technology of China, in accordance with NIH guidelines for the Care and Use of Laboratory Animals.
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Chen, P., Zhao, LJ., Huang, L. et al. Nafamostat mesilate prevented caerulein-induced pancreatic injury by targeting HDAC6-mediated NLRP3 inflammasome activation. Inflamm. Res. 72, 1919–1932 (2023). https://doi.org/10.1007/s00011-023-01794-0
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DOI: https://doi.org/10.1007/s00011-023-01794-0