Abstract
The nucleotide-binding domain, leucine-rich-repeat containing family, pyrin domain-containing 3 (NLRP3) inflammasome is essential in inflammation and inflammatory disorders. Phosphorylation at various sites on NLRP3 differentially regulates inflammasome activation. The Ser725 phosphorylation site on NLRP3 is depicted in multiple inflammasome activation scenarios, but the importance and regulation of this site has not been clarified. The present study revealed that the phosphorylation of Ser725 was an essential step for the priming of the NLRP3 inflammasome in macrophages. We also showed that Ser725 was directly phosphorylated by misshapen (Msn)/NIK-related kinase 1 (MINK1), depending on the direct interaction between MINK1 and the NLRP3 LRR domain. MINK1 deficiency reduced NLRP3 activation and suppressed inflammatory responses in mouse models of acute sepsis and peritonitis. Reactive oxygen species (ROS) upregulated the kinase activity of MINK1 and subsequently promoted inflammasome priming via NLRP3 Ser725 phosphorylation. Eliminating ROS suppressed NLRP3 activation and reduced sepsis and peritonitis symptoms in a MINK1-dependent manner. Altogether, our study reveals a direct regulation of the NLRP3 inflammasome by Msn family kinase MINK1 and suggests that modulation of MINK1 activity is a potential intervention strategy for inflammasome-related diseases.
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Acknowledgements
The authors thank Xinhui Song, Chun Guo, Jiajia Wang, and Yingying Huang from the core facilities (Zhejiang University School of Medicine) for technical assistance in histology and FACS analysis. The authors are grateful to Prof. Fan Yang and Wenxuan Zhen for human NLRP3-NEK7 symmetric docking. The authors thank the Key Laboratory of Immunity and Inflammatory Diseases of Zhejiang Province for their support. This work was supported by grants from the National Natural Science Foundation of China (31930038, 31770954, and 31530019 to L.L.).
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K.Z., X.J., D.W., X.L. and L.L. designed the research. K.Z., X.J., Z.C., S.C. and S.W. performed the research. K.Z., X.J. and L.L. analyzed the data. K.Z., X.J. and L.L. wrote the paper. R.D.S., H.H. and D.N. edited the paper.
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Zhu, K., Jin, X., Chi, Z. et al. Priming of NLRP3 inflammasome activation by Msn kinase MINK1 in macrophages. Cell Mol Immunol 18, 2372–2382 (2021). https://doi.org/10.1038/s41423-021-00761-1
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DOI: https://doi.org/10.1038/s41423-021-00761-1
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