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- W2000417651 abstract "Multidrug resistance (MDR) is a major obstacle to successful clinical cancer chemotherapy. A novel doxorubicin anti-resistant Stealth liposomes (DARSLs), prepared by co-encapsulating doxorubicin (DOX) and verapamil (VER) into stealth liposomes, has been developed. The average particle size of DARSLs was 118.1±22.3 nm. Encapsulation efficiencies of DOX and VER in DARSLs were greater than 95% and 70%, respectively. The IC50 of DARSLs as measured by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl tetrazolium bromide (MTT) assay in multidrug resistant rat prostate cancer Mat-LyLu-B2 (MLLB2) cells was 0.079±0.017 μM, 13 fold less than that for liposomal DOX with free VER (LDFV 0.96±0.46 μM) but only about 2 times less than FDFV. The IC50 cytotoxicity on MLLB2 cells of the various formulations was as follows: DARSLs∼LDLV<FDFV<FDLV<LDFV<LD<FD, (LD: liposomal DOX; LV: liposomal VER; FD: free DOX; FV: free VER). Similar cytotoxicities were shown between DARSLs and FDFV in DOX-resistant human uterus sarcoma MES-SA/DX5 cells, reversing DOX-resistance to that shown by FD on DOX-sensitive MES-SA cells. For MLLB2 cells, DARSLs was the most cytotoxic, but its intracellular concentration of DOX, measured as mean cellular fluorescence with flow cytometry was lower (p<0.01) than that observed with the FDFV formulation. In conclusion, DARSLs was an effective DOX formulation which could overcome drug resistance in DOX-resistant tumor cells, but its mechanisms of action may be complex." @default.
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- W2000417651 date "2005-01-01" @default.
- W2000417651 modified "2023-09-27" @default.
- W2000417651 title "In Vitro Cytotoxicity of Stealth Liposomes Co-encapsulating Doxorubicin and Verapamil on Doxorubicin-Resistant Tumor Cells" @default.
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- W2000417651 doi "https://doi.org/10.1248/bpb.28.822" @default.
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