Extended Data Fig. 10: Adoptive transfer of STAT5B-CA-armed αβILTCKs deters tumor growth.

a, Immunofluorescence images showing expression of IL-15 and CDH1 in tumor tissues from patients with colon carcinoma (left panel). Flow cytometric analysis of FCER1G and PD-1 expression in TCRβ⁺CD4^– cells from the same tumor tissue (right panel). Data are representative of two independent experiments. b, Correlation between frequency of PD-1⁺ cells among CD45⁺TCRβ⁺CD4^– cells and IL-15 expression level in tumor tissues from patients with colon carcinoma. Each dot denotes an independent patient sample. c, Statistical analysis showing relative mRNA expression of Il15 in sorted CD45^–EpCAM⁺ cancer cells from S100a8-cre-Il15^fl/flPyMT (n = 3) and control PyMT mice (n = 3). d, Flow cytometric analysis of PD-1, NK1.1, and granzyme B expression in thymic αβILTCK progenitors (αβILTCKPs) one, three, or five days after culturing in the presence of 100 ng/ml IL-15/IL-15Rα complex. Data are representative of three independent experiments. e, A schematic diagram showing αβILTCK-based adoptive cellular transfer experiment. A constitutively active form of Stat5b (STAT5B-CA) was induced in thymic αβILTCKPs by tamoxifen administration one week after adoptive transfer into lymphocyte-deficient PyMT recipient mice with a total tumor burden of 300–400 mm³. f, Expression of Ly6G and TCRβ by tumor-infiltrating CD45⁺ cells. g, Statistical analysis of the frequency of donor-derived Ubc-creER-Rosa26^+/+ (n = 5) or Ubc-creER-Rosa26^{LSL-Stat5b-CA/+} (n = 5) TCRβ⁺ cells among tumor-infiltrating CD45⁺ cells. h, Flow cytometric analysis of NK1.1 and granzyme B expression by donor-derived TCRβ⁺ cells in the tumor. i, Frequency of NK1.1⁺Granzyme B⁺ cells among transferred TCRβ⁺ cells. j, Total tumor burden in mice adoptively transferred with no cells or thymic αβILTCKPs of indicated genotypes. Data are pooled from three independent experiments. No transfer (n = 4), Ubc-creER-Rosa26^+/+ (n = 8), and Ubc-creER-Rosa26^Stat5b-CA/+ (n = 7). k, A schematic diagram showing αβILTCK-based adoptive cellular transfer experiment. STAT5B-CA was induced in thymic CD45.1⁺CD45.2⁺ αβILTCK progenitors or CD8 single positive T cells by tamoxifen administration one week after adoptive transfer into congenically distinct CD45.2⁺ PyMT recipient mice. All statistical data are shown as mean ± S.D (independent human samples in a, b, biologically independent mice in c, f–j and independent cell culture samples in d). Linear regression (b), two-tailed unpaired t-test (c, g, i) and two-way analysis of variance (ANOVA) (j) with post hoc Bonferroni t-test. *P < 0.05; **P < 0.01; ***P < 0.001; ****P < 0.0001 and n.s.: not significant.

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