Abstract
Endotoxemia induced by lipopolysaccharide (LPS) is an extremely severe syndrome identified by global activation of inflammatory responses. Neutrophil extracellular traps (NETs) play an important role in the development of endotoxemia. Histone hypercitrullination catalyzed by peptidylarginine deiminases (PADs) is a key step of NET formation. We have previously demonstrated that simultaneous inhibition of PAD2 and PAD4 with pan-PAD inhibitors can decrease NETosis and improve survival in a mouse model of LPS-induced endotoxic shock. However, the effects of PAD2 specific inhibition during NETosis and endotoxic shock are poorly understood. Therefore, in the present study, we aimed to investigate the effect of the specific PAD2 or PAD4 inhibitor on LPS-induced endotoxic shock in mice. We found that PAD2 inhibition but not PAD4 inhibition improves survival. Also, the levels of proinflammatory cytokines and NETosis were significantly reduced by PAD2 inhibitor. To our knowledge, this study demonstrates for the first time that PAD2 inhibition can reduce NETosis, decrease inflammatory cytokine production, and protect against endotoxin-induced lethality. Our findings provided a novel therapeutic strategy for the treatment of endotoxic shock.
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Funding
This work was funded by grants from Kickstart N022142 to Dr. Yongqing Li, UMHS-PUHSC Joint Institute U050150 and the National Institutes of Health Grant 5 R01 GM084127 to Dr. Hasan B. Alam and by the National Institutes of Health Grant R35 GM118112 to Paul R. Thompson.
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YL and HA designed the study. QD and BP carried out the experiments. YL and ZW wrote the manuscript, and YL and HA made a critical revision. QD, BP, YT, and UFB reviewed manuscript, and XD, BL, YT, and ZW provided experimental support. All authors read and approved the final manuscript.
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The protocol for the animal experiments was approved by the University of Michigan Institutional Animal Care and Use Committee (PRO00008861). All experiments complied with animal welfare and research regulations.
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Wu, Z., Deng, Q., Pan, B. et al. Inhibition of PAD2 Improves Survival in a Mouse Model of Lethal LPS-Induced Endotoxic Shock. Inflammation 43, 1436–1445 (2020). https://doi.org/10.1007/s10753-020-01221-0
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DOI: https://doi.org/10.1007/s10753-020-01221-0