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Inhibition of cIAP1/2 reduces RIPK1 phosphorylation in pulmonary endothelial cells and alleviate sepsis-induced lung injury and inflammatory response

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Abstract

Acute respiratory distress syndrome (ARDS)/acute lung injury (ALI) is a severe complication of sepsis characterized by acute respiratory distress, hypoxemia, and diffuse bilateral pulmonary infiltrates. The regulation of RIPK1 is an important part of the inflammatory response, and cIAP1/2 serves as the E3 ubiquitin ligase for RIPK1. In this study, we investigated the effect and mechanism of cIAP1/2 inhibition on sepsis-induced lung injury. Our results showed that cIAP1/2 inhibition can alleviate sepsis-induced lung injury and reduce the inflammatory response, which is accompanied by downregulation of RIPK1 phosphorylation and ubiquitination. Additionally, cIAP1/2 inhibition led to the up-regulation of programmed cell death, including apoptosis, necroptosis, and pyroptosis, and inhibiting these three cell death pathways can further reduce the inflammatory response, which is similar to the recently discovered programmed cell death pathway PANoptosis. Our findings suggest that cIAP1/2 and PANoptosis inhibition may be a new strategy for treating sepsis-induced lung injury and provide important references for further exploring the mechanism of sepsis-induced lung injury and identifying new therapeutic targets.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

We would like to express our gratitude to the Beijing Key Lab for Immune-Mediated Inflammatory Diseases of China-Japan Friendship Hospital for providing the cell culture environment and to the Institute of Clinical Medical Research of China-Japan Friendship Hospital for their laboratory support.

Funding

This work was supported by the National Natural Science Foundation of China [no. 82272196] and National Key R&D Program of China [no. 2023YFC3011804].

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Authors

Contributions

Xiaoyu Liu and Yan Li are co-first authors, designed this study, drafted the manuscript, and contributed equally to this study. Jie Chen performed the animal model and sections. Xiaoyu Liu performed cell culture and flow cytometry. Weijian Zhang conducted the data analysis. Nan Gao performed the WB and qPCR. Guoqiang Zhang and Cheng Xiao revised this manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Cheng Xiao or Guoqiang Zhang.

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Liu, X., Li, Y., Zhang, W. et al. Inhibition of cIAP1/2 reduces RIPK1 phosphorylation in pulmonary endothelial cells and alleviate sepsis-induced lung injury and inflammatory response. Immunol Res (2024). https://doi.org/10.1007/s12026-024-09491-8

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