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• W2094793265 abstract "Knowledge of the entry mechanism and intracellular routing of polyplexes is of major importance for designing efficient gene delivery systems. We therefore investigated the internalization and trafficking of polyplexes in HepG2 cells. pDNA encoding the luciferase was complexed with histidylated polylysine (His-pLK), a polymer that requires acidic pH for pDNA endosomal release. Fluoresceinylated polyplexes (F-His-pLK or F-pDNA) were internalized by clathrin-dependent and -independent pathways. The latter most likely occurred by macropinocytosis since it was stimulated by phorbol myristate and blocked by dimethylamiloride. Intracellular routing of the plasmid was analyzed by confocal microscopy and flow cytometry. These data revealed that: (i) one part of the plasmid was present in vesicles that were not labeled with any known organelle-specific marker, (ii) the other part was in transferrin receptor-positive vesicles, and (iii) the plasmid was not transferred to late endosomes/lysosomes. Using luciferase activity as a readout for gene expression, we found that it was strongly reduced when macropinocytosis was stimulated, whereas macropinocytosis inhibitors had no effect. However, blocking clathrin-dependent internalization by chlorpromazine completely prevented gene expression. These findings demonstrate that: (i) macropinocytosis of polyplexes and (ii) plasmid recycling impair the transfection efficiency and (iii) clathrin-dependent endocytosis is the most productive route for transfection of HepG2 cells." @default.
• W2094793265 created "2016-06-24" @default.
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• W2094793265 date "2004-08-01" @default.
• W2094793265 modified "2023-10-17" @default.
• W2094793265 title "Macropinocytosis of Polyplexes and Recycling of Plasmid via the Clathrin-Dependent Pathway Impair the Transfection Efficiency of Human Hepatocarcinoma Cells" @default.
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• W2094793265 doi "https://doi.org/10.1016/j.ymthe.2004.05.023" @default.
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