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. 2016 Nov 2;2:16033. doi: 10.1038/npjbcancer.2016.33

Figure 4.

Figure 4

M2-polarized macrophages sustain tumor aggressiveness and influence drug sensitivity of AXL-overexpressing breast cancer cells. (a) Wound-healing assays were conducted with untreated or R428-treated MDA-MB-231 cells cultivated in the absence (control medium) or presence of conditioned medium (CM) derived from in vitro polarized M2 macrophages. (b) Statistical analysis of wound closure. Gap size at 0 h was set to 100% and percentage of closed wound was calculated after 24 h. (c) M2-polarized macrophages increase the resistance of HCC38 and MDA-MB-231 cells to paclitaxel (Pac) and doxorubicin (Dox) treatments compared with cells treated with control medium, whereas the selective inhibition of AXL with R428 restores drug sensitivity in TNBC cells. (d) Western blot with the indicated antibodies of lysates from MDA-MB-231 cells treated with 1 μmol/l R428 at different time points. β-Actin was used as a loading control. All P values were obtained using a two-tailed Student’s t-test (mean±s.d., N=3 experiments; *P<0.05; **P⩽0.01).