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The introduction of immune checkpoint inhibitors in cancer treatment highlights the negative regulation of anti-tumor immunity, such as effector T-cell exhaustion in the tumor microenvironment. However, the mechanisms underlying the induction and prevention of T-cell exhaustion remain largely unknown. We found that CD69, a type II glycoprotein known to regulate inflammation through T-cell migration and retention in tissues, plays an important role in inducing the exhaustion of tumor-infiltrating T cells. Cd69-/- mice showed reduced tumor growth and metastasis in a 4T1-luc2 murine breast cancer model, in which increased numbers of tumor-infiltrating lymphocytes, relatively little T-cell exhaustion, and enhanced IFNγ production were observed. Anti-CD69 monoclonal antibody treatment attenuated the T-cell exhaustion and tumor progression in tumor-bearing mice. These findings highlight a novel role of CD69 in controlling the tumor immune escape mediated by T-cell exhaustion and indicate that CD69 is a novel target for cancer immunotherapy.

Crucial role of CD69 in anti-tumor immunity through regulating the exhaustion of tumor-infiltrating T cells