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• W2568479119 abstract "Because the surface of the cationic polymer gene complex is positively charged, it can result in problems such as poor blood stability and cytotoxicity. Therefore, reducing the positive charge of the cationic gene complex without affecting its transfection efficiency is crucial. To achieve this objective, a pH-responsive charge-convertible ternary complex was developed in this study. Modified plyethylenimine (PEI) with two different degrees of substitution of NH2 (plyethylenimine-1,2-cyclohexanedicarboxylic anhydride, PEI-CCA, and folic acid-plyethylenimine-1,2-cyclohexanedicarboxylic anhydride, FA-PEI-CCA) were first obtained by a chemical graft reaction. PEI-CCA and FA-PEI-CCA have significantly lower cytotoxicities and much better blood compatibilities than PEI does, and the former have an undifferentiated compression capability of DNA. The zeta potential values of the as-prepared ternary complexes (PEI-CCA/PEI/DNA and FA-PEI-CCA/PEI/DNA) were negative at pH 7.4 and positive at pH 6.5, with particle sizes of approximately 150 nm. MTT assays demonstrated the significantly lower cytotoxicities of the ternary complexes compared to that of PEI/DNA. Moreover, the cytotoxicities of the ternary complexes were lower at pH 7.4 than pH 6.5. Transfection experiments in vitro revealed that the mean fluorescence intensities and transfection efficiencies of the ternary complexes were lower than for PEI/DNA at pH 7.4 but were almost the same at pH 6.5. The ternary complex with a FA group had significantly higher mean fluorescence intensity and transfection efficiency than did the ternary complex without it. In addition, the transfection experiment in 293T cells preliminarily validated the targeting function of the FA group of the ternary complex." @default.
• W2568479119 created "2017-01-13" @default.
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• W2568479119 date "2017-04-01" @default.
• W2568479119 modified "2023-10-16" @default.
• W2568479119 title "Preparation and evaluation of pH -responsive charge-convertible ternary complex FA-PEI-CCA/PEI/DNA with low cytotoxicity and efficient gene delivery" @default.
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• W2568479119 doi "https://doi.org/10.1016/j.colsurfb.2017.01.007" @default.
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