RESUMO
Objective To investigate the molecular mechanism of Twist induced-drug resistance in human lung cell line A549 cells.Methods The sensibility of A549 cells over-expressed Twist to cisplatin was measured by CCK8 assay. The expressions of Twist,MRP1,MRP2 and MRP3 were detected by RT-PCR. Western blotting was used to detect the expressions of Twist and MRP3 in A549 cells over-expressed Twist.The correlation between Twist and MRP3 expressions in 30 cases of lung cancer tissues was detected with immunohistochemistry. Results The viability of A549 cells over-expressed Twist was significant better than the control group under cispla-tin(32,64,128 μmol/L)treatment(0.79 ± 0.039,0.63 ± 0.048,0.46 ± 0.039 vs.0.53 ± 0.039,0.41 ± 0.043, 0.27 ± 0.063,respectively). After knockdown of MRP3 expression,it reversed drug resistance induced by Twist. Clinically,the expressions of Twist and MRP3 in lung cancer tissues were significantly relevant(P < 0.05). Conclusions Twist induces the drug resistance of human lung cell line A549 to cisplatin via up-regulating the expression of MRP3.