Abstract
Blockade of programmed death-1 (PD-1) reinvigorates exhausted CD8+ T cells, resulting in tumor regression in cancer patients. Recently, reinvigoration of exhausted CD8+ T cells following PD-1 blockade was shown to be CD28-dependent in mouse models. Herein, we examined the role of CD28 in anti-PD-1 antibody-induced human T cell reinvigoration using tumor-infiltrating CD8+ T cells (CD8+ TILs) obtained from non-small-cell lung cancer patients. Single-cell analysis demonstrated a distinct expression pattern of CD28 between mouse and human CD8+ TILs. Furthermore, we found that human CD28+CD8+ but not CD28–CD8+ TILs responded to PD-1 blockade irrespective of B7/CD28 blockade, indicating that CD28 costimulation in human CD8+ TILs is dispensable for PD-1 blockade-induced reinvigoration and that loss of CD28 expression serves as a marker of anti-PD-1 antibody-unresponsive CD8+ TILs. Transcriptionally and phenotypically, PD-1 blockade-unresponsive human CD28–PD-1+CD8+ TILs exhibited characteristics of terminally exhausted CD8+ T cells with low TCF1 expression. Notably, CD28–PD-1+CD8+ TILs had preserved machinery to respond to IL-15, and IL-15 treatment enhanced the proliferation of CD28–PD-1+CD8+ TILs as well as CD28+PD-1+CD8+ TILs. Taken together, these results show that loss of CD28 expression is a marker of PD-1 blockade-unresponsive human CD8+ TILs with a TCF1– signature and provide mechanistic insights into combining IL-15 with anti-PD-1 antibodies.
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KHK, HKK, M-JA, and E-CS contributed to the conceptual design of the study. HKK, M-JA, JK, and BMK collected human samples. KHK, HL, and HK processed patients’ samples. KHK and E-CS designed the experiments. KHK, H-DK, CGK, HL, JWH, SJC were involved in data acquisition. KHK, HKK, H-DK, CGK, HL, JWH, SJC, S-HP, M-JA, and E-CS were involved in data analysis and interpretation. KHK performed statistical analysis. KHK, HKK, M-JA, and E-CS drafted the manuscript. All authors reviewed the manuscript.
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Kim, K.H., Kim, H.K., Kim, HD. et al. PD-1 blockade-unresponsive human tumor-infiltrating CD8+ T cells are marked by loss of CD28 expression and rescued by IL-15. Cell Mol Immunol 18, 385–397 (2021). https://doi.org/10.1038/s41423-020-0427-6
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DOI: https://doi.org/10.1038/s41423-020-0427-6
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