Erschienen in:
14.11.2018 | Original Research Paper
CD8+ T cell/IL-33/ILC2 axis exacerbates the liver injury in Con A-induced hepatitis in T cell-transferred Rag2-deficient mice
verfasst von:
Yuanyue Zhang, Chang Qi, Lingyun Li, Shuyao Hua, Fang Zheng, Feili Gong, Min Fang
Erschienen in:
Inflammation Research
|
Ausgabe 1/2019
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Abstract
Background
Previous studies showed that CD4+ T cells play a critical role in Con A-induced hepatitis in wild-type mice. However, the role of CD8+ T cells in the setting of Con A-induced hepatitis is enigmatic. The aim of study is to investigate the function of CD8+ T cells in the context of Con-A-induced hepatitis.
Materials and subjects
Two different mouse models of Con A-induced hepatitis, T cell-transferred Rag2−/− mice and wild-type C57BL/6 mice, were used in the present study. IL-33 gene knockout mice were used to confirm the role of alarmin in Con A-induced hepatitis.
Results
Opposing to the previous results obtained in wild-type mice, transferred CD4+ T cells alone into Rag2-knockout mice cannot cause hepatitis upon Con A challenge. In stark contrast, transferred CD8+ T cells play an important role in the pathogenesis of Con A-induced liver injury in T cell-transferred Rag2-deficient mice. Furthermore, we found that hepatocytes injured by perforin-based CD8+ T cell cytotoxicity release the alarmin IL-33. This cytokine promotes ST2+ ILC2 development and the secretion of cytokines IL-5 and IL-13 to mediate liver inflammation triggered by Con A challenge. In addition, these type 2 cytokines, including those originated from CD4+ T cells, result in eosinophils accumulation in liver to exacerbate the liver injury after Con A administration.
Conclusion
Our data for the first time revealed that CD8+ T cells play an indispensable role in the pathogenesis of Con A-induced liver injury in T cell-transferred Rag2-deficient mice. Therefore, the CD8+ T cell/IL-33/ILC2 axis is a potential therapeutic target for acute immune-mediated liver injury.