RÉSUMÉ
OBJECTIVE：To study the mechanism of Periplaneta americana extract degreasing cream and CⅡ-3（shorted for “degreasing cream ”and“CⅡ-3”）reversing the multi-drug resistance of human HepG 2/ADM cells. METHODS ：MTT assay was used to investigate the toxicity effects of different concentrations of sorafenib （positive control ），degreasing cream and C Ⅱ-3 on HepG2/ADM cells ，then IC 20 was calculated. The experiment was divided into sensitivity drug ，drug-resistance group ，sorafenib group，degreasing cream group and C Ⅱ-3 group. HepG 2 cells were included in sensitivity group ，and HepG 2/ADM cells were included in the latter 4 groups. Sensitivity group and drug-resistance group were treated with routine medium ，and other 3 groups were treated with relevant medicine （IC20 as drug concentration ）. The content of ADM in HepG 2/ADM cells was determined by Laser scanning confocal microscopy. The expression of apoptosis-related protein as Bcl- 2 and Cleaved-Caspase- 9 p37 were detected by Western blotting assay. RT-qPCR and immunocytochemistry were adopted to detect mRNA and protein expressions that related to multidrug resistance [P-gp （expression produce of MDR1 gene），LRP，BCRP] and that related to enzyme-mediated multidrug resistance pathway （GST-π and Topo Ⅱ）. RESULTS ：The IC 20 of degreasing cream ，CⅡ-3 and sorafenib were （2.40±0.16）， （200.44±27.52），（18.00±1.82）μg/mL，respectively. Compared with sensitivity group ，the protein expressions of Bcl- 2，P-gp， LRP，BCRP and Topo Ⅱ，the mRNA expressions of MDR 1， LRP，BCRP and GST-π were increased significantly in drug resistance group （P＜0.05 or P＜0.01）. Compared with @qq.com drug-resistance group ，the mRNA and protein expression of MDR1 mRNA and LRP ，BCRP，GST-π were significantly decreased in degreasing cream group and C Ⅱ-3 group（P＜ 0.05 or P＜0.01）；the protein expression of Bcl- 2 and the mRNA expression of Topo Ⅱ were significantly decreased （P＜0.01）， while the protein expression level of Cleaved-Caspase- 9 p37 was significantly increased in C Ⅱ -3 group （P＜0.05）. CONCLUSIONS：Degreasing cream and C Ⅱ-3 can reverse multidrug resistance of HepG 2/ADM cells by reducing drug efflux ， promoting cell apoptosis ，reducing the mRNA and protein expression of multi-drug resistance gene as well as gene in enzyme-mediated multi-drug resistance pathway. The effect of C Ⅱ-3 is better than that of degreasing cream.