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• W1569755883 abstract "Endosomal escape is a major bottleneck for efficient non-viral gene delivery. This paper presents the development of two novel non-viral vectors by cross-linking glycerol molecules with low molecular weight polyethylenimine (PEI). The vectors, namely, HG-PEI (45 mol% glycerol content) and LG-PEI (9 mol% glycerol content) have apparently similar DNA binding, DNA unpacking and cellular uptake abilities but differ in buffering capacity. The cellular uptake and subsequent transfection efficiency of LG-PEI is superior to commercially available PEI 25 k. Interestingly, although the cellular uptake of HG-PEI is higher than that of PEI 25 k, the transgene expression by HG-PEI-mediated transfection is very low. Inhibitor and co-localization studies demonstrate the mechanism of endocytosis and formation of endosomes prone to lysosomal lysis of HG-PEI polyplexes as a consequence of its weak buffering capacity. Importantly, when the lysosomal lysis is inhibited, the transgene expression of HG-PEI-mediated transfection increases by 9-fold of its initial capacity which is comparable to the transfection efficiency of PEI 25 k. These results indicated that the buffering capacity of the polymers primarily impacts endosomal escape and subsequent transfection efficiency. Furthermore, this study highlights the significance of cross-linkers in optimizing the buffering capacity when designing polymers for gene delivery." @default.
• W1569755883 created "2016-06-24" @default.
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• W1569755883 date "2015-01-08" @default.
• W1569755883 modified "2023-09-23" @default.
• W1569755883 title "Tuning the Buffering Capacity of Polyethylenimine with Glycerol Molecules for Efficient Gene Delivery: Staying In or Out of the Endosomes" @default.
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• W1569755883 doi "https://doi.org/10.1002/mabi.201400463" @default.
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