Fig. 2. CXCR2 deficiency impairs the differentiation of myeloid progenitor cells into mo-MDSCs.
a The percentage of mo-MDSCs and G-MDSCs induced from WT or CXCR2−/− bone marrow cells were detected by flow cytometry. The bone marrow cells were treated with the serum of control mice, tumor-bearing mice (TB), tumor-bearing mice + 20 ng/mL CXCL1, or tumor-bearing mice +20 ng/mL CXCL2 in the presence of GM-CSF for 5 days in vitro. b, c Quantitative analyses of mo-MDSCs and G-MDSCs as shown in a. d The relative level of Arg1 and iNOS mRNA expression in mo-MDSCs was analyzed by qPCR. The mo-MDSCs were sorted from WT or CXCR2−/− bone marrow progenitor cells induced by the serum of control (control) or tumor-bearing mice (TB) for 5 days. The bars represent the mean ± SD of five independent experiments. A one-way ANOVA with repeated measures followed by a Dunnett’s post hoc test or two-way ANOVA followed by a Holm-Sidak’s post hoc test show the level of statistical significance (*p < 0.05; **p < 0.01; and ***p < 0.001; ns, not significant)