Abstract
Cellular immunity mediated by CD8+ T cells plays an indispensable role in bacterial and viral clearance and cancers. However, persistent antigen stimulation of CD8+ T cells leads to an exhausted or dysfunctional cellular state characterized by the loss of effector function and high expression of inhibitory receptors during chronic viral infection and in tumors. Numerous studies have shown that glycogen synthase kinase 3 (GSK3) controls the function and development of immune cells, but whether GSK3 affects CD8+ T cells is not clearly elucidated. Here, we demonstrate that mice with deletion of Gsk3α and Gsk3β in activated CD8+ T cells (DKO) exhibited decreased CTL differentiation and effector function during acute and chronic viral infection. In addition, DKO mice failed to control tumor growth due to the upregulated expression of inhibitory receptors and augmented T-cell exhaustion in tumor-infiltrating CD8+ T cells. Strikingly, anti-PD-1 immunotherapy substantially restored tumor rejection in DKO mice. Mechanistically, GSK3 regulates T-cell exhaustion by suppressing TCR-induced nuclear import of NFAT, thereby in turn dampening NFAT-mediated exhaustion-related gene expression, including TOX/TOX2 and PD-1. Thus, we uncovered the molecular mechanisms underlying GSK3 regulation of CTL differentiation and T-cell exhaustion in anti-tumor immune responses.
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Data availability
The data that support the findings of this study are available from the corresponding authors upon request.
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Acknowledgements
We thank all members of the Liu Labs (Xiamen University) for the discussion and technical assistance. We thank Xiaohong Ma and Xiufeng Sun at the Xiamen University Flow Cytometry Core and Suqin Wu in the XMU Laboratory Animal Center for technical assistance.
Funding
This study was supported by the National Natural Science Foundation of China (31770953, 81830047, and 81961138008 to CX and 32070877 to W-HL), 1000 Young Talents Program of China (NX), and the Fundamental Research Funds for the Central Universities of China-Xiamen University (20720170064 to CX). The funders had no role in the study design, data collection, and analysis, decision to publish, or preparation of the manuscript.
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YF conceived the study. YF, JW, and CL performed most of the mouse, cell, and molecular biology experiments. YF and JW performed RNA sequencing experiments. RT and KL analyzed the RNA sequencing data. YF, JW, and XG performed several of the molecular experiments. W-HL cosupervised the project. YF and W-HL wrote the manuscript with input from all authors.
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Fu, Y., Wang, J., Liu, C. et al. Glycogen synthase kinase 3 controls T-cell exhaustion by regulating NFAT activation. Cell Mol Immunol 20, 1127–1139 (2023). https://doi.org/10.1038/s41423-023-01075-0
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DOI: https://doi.org/10.1038/s41423-023-01075-0