1. SUSD2 suppresses CD8+ T cell antitumor immunity by targeting IL-2 receptor signaling
- Author
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Bao Zhao, Weipeng Gong, Anjun Ma, Jianwen Chen, Maria Velegraki, Hong Dong, Zihao Liu, Lingling Wang, Tamio Okimoto, Devin M. Jones, Yu L. Lei, Meixiao Long, Kenneth J. Oestreich, Qin Ma, Gang Xin, David P. Carbone, Kai He, Zihai Li, and Haitao Wen
- Subjects
Mice, Inbred C57BL ,Mice ,Cell Line, Tumor ,Neoplasms ,Immunology ,Tumor Microenvironment ,Animals ,Immunology and Allergy ,Receptors, Interleukin-2 ,Immunotherapy ,CD8-Positive T-Lymphocytes ,Article ,Signal Transduction - Abstract
Dysfunctional CD8(+) T cells, which have defective production of antitumor effectors, represent a major mediator of immunosuppression in the tumor microenvironment. Here, we showed that SUSD2 was a negative regulator of CD8(+) T cell antitumor function. Susd2(−/−) effector CD8(+) T cells showed enhanced production of antitumor molecules, which consequently blunted tumor growth in multiple syngeneic mouse tumor models. Through a quantitative mass spectrometry assay, we found that SUSD2 interacted with interleukin-2 receptor α (IL-2Rα) through sushi domain-dependent protein interactions and that this interaction suppressed the binding of IL-2, an essential cytokine for the effector functions of CD8(+) T cells, to IL-2Rα. SUSD2 was not expressed on regulatory CD4(+) T cells and did not affect the inhibitory function of these cells. Adoptive transfer of Susd2(−/−) chimeric antigen receptor T cells induced a robust antitumor response in mice, highlighting the potential of SUSD2 as an immunotherapy target for cancer.
- Published
- 2022