Figure 3. ABCB1 is involved in amphiregulin-mediated chemoresistance. (A, B) Levels of ABCB1 gene and protein expression in chondrosarcoma cells were detected by qPCR and Western blot assays. (C) Cis-SW cells were transfected with ABCB1 siRNA, and ABCB1 mRNA expression was examined by qPCR assay. (D) Cis-SW cells were transfected with ABCB1 siRNA, then treated with cisplatin (10 μM) for 24 h. Cell viability was examined by MTT assay. The results were obtained from 3 independent experiments and are expressed as the mean ± SEM. * p < 0.05; ** p < 0.01; *** p < 0.001 compared with controls; #p < 0.05; ##p < 0.01; ###p < 0.001 compared with cisplatin-treated controls.