ABSTRACT
Background and purpose:Multidrug resistance(MDR)is the main obstacle of chemotherapy in the treatment of cancer,and it has been reported that the muted p53 gene is related to MDR.In this study,we explored whether adenovirus mediated p53 gene(Ad-p53)could reverse MDR of human breast cancer and its impacts on the expressions of P-gp,TOPOⅡ and GST-?.Methods:In this study,adriamycin-resistant human breast carcinoma cells(MCF-7/Adr)and its parental cells(MCF-7)were used to determine the effect of Ad-p53.Cck-8 assay was adopted to evaluate the cytotoxicity of adriamycin.Western blot were performed to observe the expression of P-glycoprotein(P-gp),TopoismeraseⅡ(TOPOⅡ)and GST-?.Results:After transfection with 50 MOI Ad-p53,the 50% inhibitory concentration(IC50)of adriamycin to MCF-7/Adr cells was decreased from(4.54?0.91)?g/ml to(0.26?0.11)?g/ml,and the chemosensitivity increased 18.1 times(P
