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- W2000746048 abstract "Abstract BACKGROUND: Among the treatment options that have been developed for cancer, chemotherapy remains 1 of the leading clinical approaches. Chemotherapy can usually control tumor growth at the onset of disease, but its effectiveness becomes limited by the overexpression of transporter proteins responsible for drug efflux, leading to multidrug resistance (MDR). To overcome this obstacle, the authors explored the feasibility of down‐regulating the main drug transporter, P‐glycoprotein (P‐gp), by using nonviral small interfering RNA (siRNA) delivery as means to enhance the accumulation of chemotherapeutic agents in drug‐resistant cancer cells. METHODS: Several cationic carriers capable of siRNA complexation were investigated for P‐gp down‐regulation in the MDA435/LCC6 cell line and, consequently, increased cellular uptake of the chemotherapeutic agents doxorubicin and paclitaxel. RESULTS: Efficient siRNA delivery into tumor cells was demonstrated particularly using a palmitic‐acid substituted poly(L‐lysine), with no apparent differences in siRNA delivery between the wild type (WT)‐expressing and P‐gp‐expressing phenotype (MDR1) of the cells. Efficient siRNA delivery led to approximately 40% to 50% P‐gp suppression (based on the average expression level of the protein), an approximately 3‐fold increased DOX uptake, and increased cytotoxicity in MDR1 cells. CONCLUSIONS: The authors concluded that effective siRNA delivery with nonviral carriers can reduce the level of P‐gp on cell surfaces and enhance the efficiency of chemotherapeutic agents in vitro. Cancer 2010. © 2010 American Cancer Society." @default.
- W2000746048 created "2016-06-24" @default.
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- W2000746048 date "2010-11-29" @default.
- W2000746048 modified "2023-10-15" @default.
- W2000746048 title "Cationic polymer-mediated small interfering RNA delivery for P-glycoprotein down-regulation in tumor cells" @default.
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- W2000746048 doi "https://doi.org/10.1002/cncr.25321" @default.
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