The purpose of this study was to develop docetaxel-poly(lactide-co-glycolide)(PLGA)loaded nanoparticles by using nanoprecipitation method and optimize the relative parameters to obtain nanoparticles with higher encaps...The purpose of this study was to develop docetaxel-poly(lactide-co-glycolide)(PLGA)loaded nanoparticles by using nanoprecipitation method and optimize the relative parameters to obtain nanoparticles with higher encapsulation efficiency and smaller size. The physicochemical characteristics of nanoparticles were studied. The optimized parameters were as follows: the oil phase was mixture of acetone and ethanol, concentration of tocopheryl polyethylene glycol succinate(TPGS) was 0.2%, the ratio of oil phase to water phase was 1:5, and the theoretical drug concentration was 5%. The optimized nanoparticles were spherical with size between 130 and 150 nm. The encapsulation efficiency was(40.83±2.1)%. The in vitro release exhibited biphasic pattern. The results indicate that docetaxel-PLGA nanoparticles were successfully fabricated and may be used as the novel vehicles for docetaxel, which would replace Taxotere and play great roles in future.展开更多
The present study investigated the enhanced radiosensitivity of U-251 cells induced by sodium butyrate(NaB) and its possible mechanisms.Increased radiosensitivity of U251 cells was examined by clonogenic cell survival...The present study investigated the enhanced radiosensitivity of U-251 cells induced by sodium butyrate(NaB) and its possible mechanisms.Increased radiosensitivity of U251 cells was examined by clonogenic cell survival assays.The expression of Ku70 mRNA and protein was detected by using RT-PCR and Western blotting respectively.γ-H2AX foci were measured at different time points after ionizing irradiation alone or combined with NaB treatment.The results showed that cell survival rate was significantly reduced,both D0 and Dq values were decreased(D0:1.43 Gy vs.1.76 Gy;Dq:1.22 Gy vs.2.05 Gy) after the combined treatment as compared with irradiation alone,and sensitivity enhancing ratio(SER) reached 1.23.The average number of γ-H2AX foci per cell receiving the combined treatment was significantly increased at different time points,and the expression levels of Ku70 mRNA and protein were suppressed by NaB in a dose-dependent manner.It was concluded that enhanced radiosensitivity induced by NaB involves an inhibited expression of Ku70 and an increase in γ-H2AX foci,which suggests decreased ability in DSB repair.展开更多
基金supported by National Natural Science Foundation of China(No.H1610 81172121)
文摘The purpose of this study was to develop docetaxel-poly(lactide-co-glycolide)(PLGA)loaded nanoparticles by using nanoprecipitation method and optimize the relative parameters to obtain nanoparticles with higher encapsulation efficiency and smaller size. The physicochemical characteristics of nanoparticles were studied. The optimized parameters were as follows: the oil phase was mixture of acetone and ethanol, concentration of tocopheryl polyethylene glycol succinate(TPGS) was 0.2%, the ratio of oil phase to water phase was 1:5, and the theoretical drug concentration was 5%. The optimized nanoparticles were spherical with size between 130 and 150 nm. The encapsulation efficiency was(40.83±2.1)%. The in vitro release exhibited biphasic pattern. The results indicate that docetaxel-PLGA nanoparticles were successfully fabricated and may be used as the novel vehicles for docetaxel, which would replace Taxotere and play great roles in future.
基金supported by a grant from National Natural Sciences Foundation of China(No.30870739)
文摘The present study investigated the enhanced radiosensitivity of U-251 cells induced by sodium butyrate(NaB) and its possible mechanisms.Increased radiosensitivity of U251 cells was examined by clonogenic cell survival assays.The expression of Ku70 mRNA and protein was detected by using RT-PCR and Western blotting respectively.γ-H2AX foci were measured at different time points after ionizing irradiation alone or combined with NaB treatment.The results showed that cell survival rate was significantly reduced,both D0 and Dq values were decreased(D0:1.43 Gy vs.1.76 Gy;Dq:1.22 Gy vs.2.05 Gy) after the combined treatment as compared with irradiation alone,and sensitivity enhancing ratio(SER) reached 1.23.The average number of γ-H2AX foci per cell receiving the combined treatment was significantly increased at different time points,and the expression levels of Ku70 mRNA and protein were suppressed by NaB in a dose-dependent manner.It was concluded that enhanced radiosensitivity induced by NaB involves an inhibited expression of Ku70 and an increase in γ-H2AX foci,which suggests decreased ability in DSB repair.
