Fig. 2

MM cells promote macrophages towards M2 polarization via autocrine CCL3. A-B: Expression levels of CCL3 and CCR5 mRNA in monocytic THP-1 and MM RPMI 8226 and MM IM9 cell lines was evaluated by qRT-PCR. C: Verification of overexpression (CCL3 OE) and knockdown (shCCL3) RPMI 8226 cells by qRT-PCR. D: Flow cytometric analysis of CD206 + cells after co-culture of THP-1 cells with CCL3-NC RPMI 8226 cells, RPMI 8226 cells, CCL3-OE RPMI 8226 cells or shCCL3 RPMI 8226 cells. E: Quantification of the differences in CD206 + cell levels among groups