Melanoma donor (MD) NK cells are functionally impaired/exhausted.

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Presentation transcript:

Melanoma donor (MD) NK cells are functionally impaired/exhausted. Melanoma donor (MD) NK cells are functionally impaired/exhausted. A, freshly purified NK cells [healthy donors (HD), n = 12; melanoma donors, n = 5] were stimulated with 200 U/mL of IL-2. Expression of IL-2R (α-chain), IFN-γ production, and cytotoxicity (Lamp-1 expression) were monitored every 2 days over 6 days (day 0, 2, 4, and 6) by flow cytometry. B, the percentage of Lamp-1+ NK cells from healthy (n = 30) and melanoma donors (n = 12) after a cytotoxic assay is shown using K562 cells as target cells (top left). The percentage of IFN-γ+ NK cells from healthy (n = 22) and melanoma donors (n = 9) is shown after 4 hours of stimulation with IL-12 (middle left). The percentage of proliferating NK cells from healthy (n = 10) and melanoma donors (n = 7) is shown after 6 days of culture in the presence of 200 U/mL of IL-2 (bottom left). On the right panel of each graph, plots depicting the expression of Lamp-1, IFN-γ, and CFSE in NK cells purified from a representative healthy donor and a representative melanoma patient are shown. C, graphs representing the MFI of T-bet and Eomes on NK cells purified from healthy (n = 19) and melanoma donors (n = 14). Representative plots are shown (isotype control, black; healthy donors, unfilled; melanoma donors, gray). All experiments were performed in duplicate. Ines Pires da Silva et al. Cancer Immunol Res 2014;2:410-422 ©2014 by American Association for Cancer Research