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• W2087147942 abstract "Polyplexes assembled from poly(aspartamide) derivatives bearing 1,2-diaminoethane side chains, [PAsp(DET)] display amplified in vitro and in vivo transfection activity with minimal cytotoxicity. To elucidate the molecular mechanisms involved in this unique function of PAsp(DET) polyplexes, the physicochemical and biological properties of PAsp(DET) were thoroughly evaluated with a control bearing 1,3-diaminopropane side chains, PAsp(DPT). Between PAsp(DET) and PAsp(DPT) polyplexes, we observed negligible physicochemical differences in particle size and zeta-potential. However, the one methylene variation between 1,2-diaminoethane and 1,3-diaminopropane drastically altered the transfection profiles. In sharp contrast to the constantly high transfection efficacy of PAsp(DET) polyplexes, even in regions of excess polycation to plasmid DNA (pDNA) (high N/P ratio), PAsp(DPT) polyplexes showed a significant drop in the transfection efficacy at high N/P ratios due to the progressively increased cytotoxicity with N/P ratio. The high cytotoxicity of PAsp(DPT) was closely correlated to its strong destabilization effect on cellular membrane estimated by hemolysis, leakage assay of cytoplasmic enzyme (LDH assay), and confocal laser scanning microscopic observation. Interestingly, PAsp(DET) revealed minimal membrane destabilization at physiological pH, yet there was significant enhancement in the membrane destabilization at the acidic pH mimicking the late endosomal compartment (pH approximately 5). Apparently, the pH-selective membrane destabilization profile of PAsp(DET) corresponded to a protonation change in the flanking diamine unit, i.e., the monoprotonated gauche form at physiological pH and diprotonated anti form at acidic pH. These significant results suggest that the protonated charge state of 1,2-diaminoethane may play a substantial role in the endosomal disruption. Moreover, this novel approach for endosomal disruption neither perturbs the membranes of cytoplasmic vesicles nor organelles at physiological pH. Thus, PAsp(DET) polyplexes, residing in late endosomal or lysosomal states, smoothly exit into the cytoplasm for successful transfection without compromising cell viability." @default.
• W2087147942 created "2016-06-24" @default.
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• W2087147942 date "2008-11-12" @default.
• W2087147942 modified "2023-09-30" @default.
• W2087147942 title "Polyplexes from Poly(aspartamide) Bearing 1,2-Diaminoethane Side Chains Induce pH-Selective, Endosomal Membrane Destabilization with Amplified Transfection and Negligible Cytotoxicity" @default.
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• W2087147942 doi "https://doi.org/10.1021/ja804561g" @default.
• W2087147942 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19006313" @default.
• W2087147942 hasPublicationYear "2008" @default.
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