Abstract
Multidrug resistance (MDR) has become an obstacle for chemotherapy of cancer. p53 is reported to participate in the regulation of MDR, but the association between p53 status and MDR are complicated and conditional. It has been verified that apoptosis is not the only mechanism for MDR regulation by p53, the roles of autophagy in MDR is less studied. Human ovarian carcinoma cell lines SKOV3 and multidrug resistant phenotype SKVCR cells were used and wild-type p53 (wt p53) and mutant 175H constructs were introduced into cells to establish cell models with different p53 status by gene engineering, the sensitivity to vincristine (VCR), cisplatin (DDP), pirarubicin (THP) and etoposide (VP-16) were detected by MTT assay, Western blot and quantitative real-time PCR were used to detect the expression of protein and mRNA, especially, monodansylcadaverine (MDC) staining was used for autophagy rate, Hoechst 33342/propidium iodide (PI) were used to assess apoptosis and necrosis. SKVCR cells induced by VCR shown overexpression of P-glycoprotein (P-gp) and MDR, and also displayed an enhanced autophagy compared with parental SKOV3. Wt p53 and 175H has no influence on drug sensitivity in SKOV3, while both sensitized SKVCR cells to VCR, THP and ...Continue Reading
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