RESUMEN
To prepare and characterize Pluronic-PEI micelles as a drug/gene delivery system.We used the low-molecular-weight PEI as a cross-linking agent to prepare the Pluronic-PEI micelles. The particle size, zeta potential and critical micelle concentration (CMC) were measured by dynamic light scattering (DLS) and pyrene fluorescence probe. The cytotoxicity, transfection efficiency and the impact on the intracellular ATP and P-gp levels of Pluronic-PEI micelles were investigated at the cellular level.Pluronic-PEI micelles were successfully prepared with a suitable particle size (120-180 nm), zeta potential (+6-+9 mv), and a good ability to carry the drug/gene. Anstudy showed that Pluronic-PEI had low cytotoxicity, and the P123-PEI600 possessed high gene transfection efficiency and could downregulate the intracellular ATP and P-gp levels.Pluronic-PEI is a good drug/gene delivery system, and P123-PEI600 is an ideal vector, which may be used in the combination therapy for reversing multidrug resistance.
RESUMEN
To design and synthesize photosensitizers with different substituents and to identify its physicochemical characteritics and photodynamic effect on cancer cells.Two kinds of BODIPY photosensitizers BPOI and BPCI were synthesized through condensation reaction between aldehyde and reactive hydrogen of pyrrole, followed with electrophilic substitution reaction. Physicochemical properties were characterized byH NMR, FT-IR and UV-visible absorption spectra and fluorescence emission spectra. The ability to produce reactive oxygen species was detected by BPDF and DCFH-DA. Photodynamic therapy effect on rat glioma C6 cellswas determined by MTT method.Two kinds of BODIPY photosensitizers BPOI and BPCI were successfully synthesized with different substituents, which were confirmed byH NMR, FT-IR. Both materials had low toxicity and could be readily taken up by tumor cells. The ability of synthesized photosensitizers to produce reactive oxygen species was strongly influenced by solvent polarity when the substituent was electron-donating group, while no effect was found when the substituent was electron-withdrawing group.Photosensitizer BPOI with electron-donating substituent produces reactive oxygen species with a slow rate in a highly polar environment, while greatly enhanced this effect in a low polarity environment, which is expected to be used for environmental-selective photodynamic therapy in tumor cells.