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Analysis of tumor-infiltrating exhausted T cells highlights IL-6 and PD1 blockade as a combined immunotherapy strategy for non-small cell lung cancer

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机构： [1]Public Center of Experimental Technology, The School of Basic Medical Sciences, Southwest Medical University, Luzhou, Sichuan, China, [2]Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, China, [3]Department of Head and Neck Oncology, West China Hospital of Sichuan University, Chengdu, Sichuan, China, [4]Division of Clinical Chemistry, Department of Medical Technology, Faculty of Department of Medical Technology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand, [5]Institute of Nuclear Medicine, Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Southwest Medical University, Luzhou, Sichuan, China, [6]Department of Pathology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China, [7]Blood Distribution Department Nanjing Red Cross Blood Center, Nanjing, Jiangsu, China

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关键词： exhausted CD8+T cells non-small cell lung cancer interleukin-6 PD1 combined blockade

摘要：

Given the limitations of immunotherapy for treating non-small cell lung cancer (NSCLC), we investigated the phenotype and function of exhausted CD8+T cells and analyzed a novel combination immunotherapy to restore the effector killing function of tumor-infiltrating CD8+T lymphocyte (TIL).We examined the expression and function of immunosuppressive molecules on CD8+T cells of peripheral blood mononuclear cells (PBMCs) and TILs by using prospectively collected peripheral blood, pleural effusions, and tumor tissues from patients with NSCLC and correlated the results with clinical data. We then evaluated the effect of interleukin 6 (IL-6) stimulation on CD8+T cells. Finally, we assessed the effects of combined blockade of PD1 and IL-6 on macrophage recruitment in a zebrafish macrophage model and CD8+ T cell function and tumor growth in PBMC humanized mouse model.The expression of exhaustion markers on CD8+ T cells was found to be notably higher in both tumor and paraneoplastic tissues compared to peripheral blood. Furthermore, the degree of CD8+ T cell exhaustion exhibited a progressive increase with proximity to the tumor. When CD8+ T cells from peripheral blood and tumor tissues of NSCLC patients were stimulated with IL-6, the expression level of exhaustion markers, especially PD1, was further elevated. In the in vitro experiment, the combined inhibition of IL-6 and PD1 substantially enhanced the effector killing function of CD8+ T cells in NSCLC pleural effusion samples. In a macrophage-labeled zebrafish model, combined blockade of IL-6 and PD1 enhanced the recruitment of macrophages. In PBMC humanized mouse model, combined blockade of IL-6 and PD1 enhanced the inhibition of tumor growth.Our data suggest that CD8+ T cells in NSCLC patients were in a state of exhaustion and combined blockade of IL-6 and PD1 to restore CD8+ T cell function to inhibit tumor growth may be an effective clinical strategy for the treatment of NSCLC.Copyright © 2025 Zhang, Guo, Sun, Liao, Liu, Ye, Yang, Cressey, He and Yuan.

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出版当年[2025]版：

大类 | 2 区医学

小类 | 2 区免疫学

最新[2025]版：

大类 | 2 区医学

小类 | 2 区免疫学

第一作者：

第一作者机构： [1]Public Center of Experimental Technology, The School of Basic Medical Sciences, Southwest Medical University, Luzhou, Sichuan, China, [2]Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, China,

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通讯作者：

通讯机构： [1]Public Center of Experimental Technology, The School of Basic Medical Sciences, Southwest Medical University, Luzhou, Sichuan, China, [7]Blood Distribution Department Nanjing Red Cross Blood Center, Nanjing, Jiangsu, China

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Analysis of tumor-infiltrating exhausted T cells highlights IL-6 and PD1 blockade as a combined immunotherapy strategy for non-small cell lung cancer

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