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• W2070049097 abstract "Abstract Amphiphilic polyelectrolytes comprising cationic and uncharged hydrophilic segments condensed negatively charged DNA to form a core‐shell structure stabilized by a layer of hydrophilic corona chains. At physiological pH, four‐arm star‐shaped poly(ethylene oxide)‐ b ‐poly(2‐(diethylamino)ethyl methacrylate) (four‐arm PEO‐ b ‐PDEAEMA) block copolymer possessed positively charged amine groups that interacted with negatively charged plasmid DNA to form polymer/DNA complexes. The mechanism and physicochemical properties of the complex formation were investigated at varying molar ratio of amine groups on polymer chains and phosphate group on plasmid DNA segments (N/P ratio). The capability of the star block copolymer to condense DNA was demonstrated through gel electrophoresis and ethidium bromide exclusion assay. In the absence of salt, the hydrodynamic radius of polyplexes was about 94 nm at low polymer/DNA ratio, and it decreased to about 34 nm at large N/P ratios, forming a compact spherical structure with a weighted average molecular weight of 4.39 ± 0.22 × 10 6 g/mol. Approximately 15 polymeric chains were required to condense a plasmid DNA. The addition of monovalent salt to the polyplexes significantly altered the size of the complexes, which would have an impact on cell transfection. Because of the electrostatic interaction induced by the diffusion of small ions, the polyplex increased in size to about 53 nm with a less compact structure. In vitro cytotoxicty of polymer and polymer/pDNA complexes were evaluated, and the polyplexes exhibited low toxicity at low N/P ratios. At N/P ratio of 4.5, the four‐arm PEO‐ b ‐PDEAEMA showed the highest level of transfection in Neuro‐2A cells. These observations showed that the star‐shaped multi‐arm polymers offers interesting properties in self‐association and condensation ability for plasmid DNA and can serve as a nonviral DNA delivery system. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009" @default.
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• W2070049097 date "2008-12-01" @default.
• W2070049097 modified "2023-10-18" @default.
• W2070049097 title "Polyplex formation between four-arm poly(ethylene oxide)-<i>b</i>-poly(2-(diethylamino)ethyl methacrylate) and plasmid DNA in gene delivery" @default.
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• W2070049097 doi "https://doi.org/10.1002/jbm.a.32255" @default.
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