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Homeostatic Dysregulation of Systemic CD8+ T Cell Compartment in Lung Cancer Patients

Lee, S.-W.; Yun, J. S.; Kim, Y. J.; Kim, H.-O.; Cho, H.-J.; Park, C.-K.; Oh, I.-J.; Cho, J.-H.

2023-12-28 immunology
10.1101/2023.12.27.573474 bioRxiv
Show abstract

Cancer adapts various resistance mechanisms to counteract CD8+ T cell attacks. While this suppression of antigen-specific CD8+ T cells is common within the tumor microenvironment, little is known about how tumors affect CD8+ T cells systemically. Here we show a new link between tumor-associated homeostatic dysregulation and uncontrolled differentiation of peripheral blood CD8+ T cells. These CD8+ T cells exhibited progressive alterations indicative of diminished quiescence, increased spontaneous activation, and more-differentiated proliferation-incompetent effector cells. This phenomenon was not limited to tumor-reactive cells but broadly applicable to non-specific cells, correlating with poor clinical responses to immune checkpoint inhibitor therapy. These findings provide a new mechanism by which cancer impairs CD8+ T cells by dysregulating the homeostasis of systemic CD8+ T cell populations. One-Sentence SummaryCancer-associated homeostatic dysregulation accelerates uncontrolled differentiation of systemic CD8+ T cells.

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