Abstract
Tumor-associated ligands of the activating NKG2D receptor can effectively stimulate T cell responses at early but not late stages of tumor growth. In late-stage human tumor settings, we observed MIC-driven proliferation of NKG2D+CD4+ T cells that produced the cytokine Fas ligand (FasL) as a result of NKG2D costimulation but were themselves protected from Fas-mediated growth arrest. In contrast, FasL suppressed proliferation of T cells in vitro that did not receive NKG2D costimulation. Similar observations with normal peripheral blood NKG2D+CD8+ T cells demonstrated unrecognized NKG2D-mediated immune functions, whereby FasL release promotes tumor cell death and NKG2D costimulation prolongs T cell survival. These effects, beneficial in conditions of limited NKG2D ligand expression, may be counterweighed when massive expression and shedding of MIC occurs, such as in some late-stage tumors, that causes sustained NKG2D costimulation and population expansion of immunosuppressive T cells.
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Change history
20 June 2006
In the version of this article initially published, the key and figure labels for Figure 8c are incorrect. The gray bars are C1R–A2–MICA–M27, the filled bars are C1R–A2–M27, and the cells are CD8+ (not CD4+). The error has been corrected in the HTML and PDF versions of the article.
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Acknowledgements
We thank G. Venkataraman for help with real-time PCR, and C. Yee for T cell clones. Supported by the Avon Foundation Breast Cancer Immunotherapy Research Initiative and the National Institutes of Health (AI30581 and AI52319).
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Supplementary information
Supplementary Fig. 1
Frequency distributions of NKG2D+CD4+ T cells. (PDF 448 kb)
Supplementary Fig. 2
Expression of CD25, CD45RO and HLA-DR by NKG2D+CD4+ T (PDF 176 kb)
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Groh, V., Smythe, K., Dai, Z. et al. Fas ligand–mediated paracrine T cell regulation by the receptor NKG2D in tumor immunity. Nat Immunol 7, 755–762 (2006). https://doi.org/10.1038/ni1350
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DOI: https://doi.org/10.1038/ni1350
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