IL-22 Alleviates Sepsis-Induced Acute Lung Injury by Inhibiting Epithelial Cell Apoptosis Associated with STAT3 Signalling

Chiying Zhu,1,2,* Jiabo Chen,2,3,* Zhengzheng Yan,4 Fei Wang,5 Ziqi Sun,2,3 Zeyu Liu,1,2 Ying Li,4 Xiaona Chen,2,6 Ziwei Bao,1 Quan Li,1– 3,6 Zhixia Chen2,3 1Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine, Shenzhen, 518116, People’s Republic of China; 2Department of Anesthesiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Shenzhen, 518116, People’s Republic of China; 3Department of Anesthesiology, School of Medicine, The First Affiliated Hospital of Nanchang University, Nanchang University, Nanchang, 330006, People’s Republic of China; 4Laboratory Animal Research Center, The Tenth Affiliated Hospital, Southern Medical University (Dongguan People’s Hospital), Dongguan, 523000, People’s Republic of China; 5The Tenth Affiliated Hospital, Southern Medical University (Dongguan People’s Hospital), Dongguan, 523059, People’s Republic of China; 6Department of Biology, School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, People’s Republic of China*These authors contributed equally to this workCorrespondence: Zhixia Chen, Department of Anesthesiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Shenzhen, 518116, People’s Republic of China, Email [email protected] Quan Li, Department of Anesthesiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Shenzhen, 518116, People’s Republic of China, Email [email protected]: Sepsis is a critical condition characterized by organ dysfunction due to an aberrant response to infection, which results in a life-threatening situation. The lung, which is the most vulnerable target organ, is often severely damaged during sepsis. Research has demonstrated that interleukin-22 (IL-22), which is secreted by various immunocytes, can mitigate inflammation-associated diseases. Nevertheless, the precise function of IL-22 in sepsis-induced acute lung injury (SALI) is still unclear. This study aimed to investigate the therapeutic efficacy of IL-22 in sepsis and explore the regulatory mechanisms involved.Methods: A mouse caecal ligation and puncture (CLP) model of sepsis was established, and the effect of IL-22 was investigated as indicated. Immunohistochemistry, qRT‒PCR, ELISA, immunofluorescence, TUNEL, Western blotting, and flow cytometry assays were applied to investigate the protective efficacy and involved pathways. Additionally, an in vitro model of lipopolysaccharide (LPS)-induced bronchial epithelial cell (BEAS-2B) apoptosis was established, and these cells were treated with or without recombinant IL-22 (rIL-22) to further evaluate the effect of IL-22 and the underlying mechanism.Results: The experimental results clearly confirmed that the levels of IL-22 were increased in the serum and lung tissue after CLP. The administration of rIL-22 was observed to increase the survival rate of septic mice. Notably, rIL-22 treatment resulted in decreased levels of proteins and a decreased cell number in the bronchoalveolar lavage fluid, as well as in a reduction in inflammatory cytokine release into the serum. Importantly, rIL-22 mitigated SALI by inhibiting lung cell apoptosis in septic mice. Furthermore, the results revealed that rIL-22 attenuated apoptosis of lung epithelial cells via the activation of the STAT3 signalling pathway.Conclusion: The results of this study suggest that IL-22 alleviates lung epithelial cell apoptosis to protect mice against SALI in association with the STAT3 signalling pathway, highlighting the potential therapeutic value of IL-22 against sepsis. Keywords: IL-22, sepsis, acute lung injury, apoptosis, STAT3