In this paper,the relationship of intracellular acidification and apoptosis in Hela cells induced by vin-cristine sulfate has been studied by use of the ratiometric pH nanosensors that have been developed by our group...In this paper,the relationship of intracellular acidification and apoptosis in Hela cells induced by vin-cristine sulfate has been studied by use of the ratiometric pH nanosensors that have been developed by our group,employing fluorescein isothiocyanate(FITC) doped as the pH-sensitive dye and Tris(2,2'-bipyidyl) dichlororuthenium(II) hexahydrate(RuBpy) doped as reference dye. The pH change of the Hela cells induced by vincristine sulfate has been monitored in vivo,in situ and real time by use of the ratiometric pH nanosensors. The experimental results show that the pH of the apoptotic Hela cells induced by vincristine sulfate has been acidified from 7.11 to 6.51,and the percentage of intra-cellular acidification is correlated with the induced concentration and incubation time of the vincristine sulfate. The further study of the percentage of intracellular acidification and the percentage of apop-tosis of Hela cells at the same time reveals that apoptosis of Hela cells induced by vincristine sulfate is preceded by intracellular acidification. These results would provide theoretical foundation for the therapy of cancer through interfering the pH of cells by use of vincristine sulfate or other anti-cancer drugs.展开更多
Objective To prepare the PEG-PLGA nanoparticles loaded with vincristine sulfate(VCR-loaded PEG-PLGA-NPs) and evaluate their quality.Methods VCR-loaded PEG-PLGA-NPs were prepared by the double emulsion solvent evaporat...Objective To prepare the PEG-PLGA nanoparticles loaded with vincristine sulfate(VCR-loaded PEG-PLGA-NPs) and evaluate their quality.Methods VCR-loaded PEG-PLGA-NPs were prepared by the double emulsion solvent evaporation method.The main experimental factors,which influenced the physical and chemical properties of the nanoparticles,were investigated and optimized.Results Under optimal conditions,the VCR-loaded PEG-PLGA-NPs had an average diameter of 135.9 nm with narrow size distribution.The encapsulation efficiency was 68.2%,while the drug loading capacity was 8.34%.In vitro,VCR was released from the PEG-PLGA-NPs sustainedly for more than 13 days with the total amount of 81%.Moreover,the VCR-loaded PEG-PLGA-NPs were relatively stable,which was confirmed by the stability testing.Conclusion The VCR-loaded PEG-PLGA-NPs are a promising nano drug with controlled release,which can be applied widely.展开更多
基金Supported by the Key Project of National Natural Science Foundation of China (Grant No. 20135010)the National Key Basic Research Program of China (Grant No. 2002CB513100-10)+3 种基金the Key Technology Research and Development Program of China (Grant No. 2003BA310A16)the High-Tech Research and Development Program of China (Grant No. 2003AA302250)the International Cooperation Key Project of Science and Technology Ministry (Grant No. 2003DF000039)the National Natural Science Foundation of China (Grant No. 20405005)
文摘In this paper,the relationship of intracellular acidification and apoptosis in Hela cells induced by vin-cristine sulfate has been studied by use of the ratiometric pH nanosensors that have been developed by our group,employing fluorescein isothiocyanate(FITC) doped as the pH-sensitive dye and Tris(2,2'-bipyidyl) dichlororuthenium(II) hexahydrate(RuBpy) doped as reference dye. The pH change of the Hela cells induced by vincristine sulfate has been monitored in vivo,in situ and real time by use of the ratiometric pH nanosensors. The experimental results show that the pH of the apoptotic Hela cells induced by vincristine sulfate has been acidified from 7.11 to 6.51,and the percentage of intra-cellular acidification is correlated with the induced concentration and incubation time of the vincristine sulfate. The further study of the percentage of intracellular acidification and the percentage of apop-tosis of Hela cells at the same time reveals that apoptosis of Hela cells induced by vincristine sulfate is preceded by intracellular acidification. These results would provide theoretical foundation for the therapy of cancer through interfering the pH of cells by use of vincristine sulfate or other anti-cancer drugs.
基金the National 863 Hi-tech Project for financial support (2007AA021803, 2007AA021901)
文摘Objective To prepare the PEG-PLGA nanoparticles loaded with vincristine sulfate(VCR-loaded PEG-PLGA-NPs) and evaluate their quality.Methods VCR-loaded PEG-PLGA-NPs were prepared by the double emulsion solvent evaporation method.The main experimental factors,which influenced the physical and chemical properties of the nanoparticles,were investigated and optimized.Results Under optimal conditions,the VCR-loaded PEG-PLGA-NPs had an average diameter of 135.9 nm with narrow size distribution.The encapsulation efficiency was 68.2%,while the drug loading capacity was 8.34%.In vitro,VCR was released from the PEG-PLGA-NPs sustainedly for more than 13 days with the total amount of 81%.Moreover,the VCR-loaded PEG-PLGA-NPs were relatively stable,which was confirmed by the stability testing.Conclusion The VCR-loaded PEG-PLGA-NPs are a promising nano drug with controlled release,which can be applied widely.
