Reduced tumor growth in CCR5-deficient mice is associated with perturbed killing ability of Treg cells. Reduced tumor growth in CCR5-deficient mice is.

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Reduced tumor growth in CCR5-deficient mice is associated with perturbed killing ability of Treg cells. Reduced tumor growth in CCR5-deficient mice is associated with perturbed killing ability of Treg cells. A, a total of 1 × 105 CT26 cells were inoculated in BALB/c mice (WT, -○-), CCR5-deficient mice (CCR5KO, -▵-), and CCR3-deficient mice (CCR3KO, -▪-). The growth of the tumors in different groups is depicted. Three weeks after tumor inoculation, the percentage of (B) CD4+Foxp3+ Treg cells and (C) Annexin V+CD8+ T cells and (D) the expression of TGF-β and LAP in Treg cells in TILs were determined by flow cytometry. E, Treg cells were isolated from spleen of BALB/c mice, CCR3-deficient mice, or CCR5-deficient mice bearing control CT26 tumors and cultured with IL-2 in the absence or presence of CCL5 for 18 hours. These Treg cells were stimulated with anti-CD3 mAb and anti-CD28 mAb for 24 hours, and the expression of TGF-β and LAP by Treg cells were determined by flow cytometry. F, Treg cells were cocultured with CD8+ T cells and this coculture was stimulated with anti-CD3 mAb and anti-CD28 mAb for 48 hours. The expression of Annexin V+ on CD8+ T cells was determined by flow cytometry. Data show mean ± SEM of n = 6 mice. Results are representative of 3 independent experiments.*, P < 0.05 and NS, not statistically significant. Li-Yuan Chang et al. Cancer Res 2012;72:1092-1102 ©2012 by American Association for Cancer Research