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• W2116345484 abstract "In the development of potent polymeric gene carriers for gene therapy, a good interaction between the polymer and the nucleotide is indispensable to form small and stable polyplexes. Polymers with relatively high cationic charge density are frequently used to provide these interactions, but high cationic charge is usually associated with severe cytotoxicity. In this study an alternative, nucleotide specific binding interaction based on intercalation was investigated to improve polymer/pDNA complex formation. For this purpose bioreducible poly(amido amine) copolymers (p(CBA-ABOL/Nic)) were synthesized with different degrees of intercalating quaternary nicotinamide (Nic) groups and amide-substituted derivatives in their side chains. The quaternary nicotinamide group was chosen as intercalating moiety because this group is part of the naturally occurring NAD+ coenzyme and is therefore expected to be non-toxic and non-carcinogenic. The presence of the quaternary nicotinamide moieties in the poly(amido amine) copolymers showed to effectively promote self-assembled polyplex formation already at low polymer/DNA ratios and results in decreased polyplex size and increased stability of the polyplexes. Furthermore, in contrast to the primary amine functionalized analogs the quaternary nicotinamide polymers showed to be non-hemolytic, indicating their compatibility with cell membranes. Polymers with 25% of Nic in the side chains induced GFP expressions of about 4–5 times that of linear PEI, which is comparable with p(CBA-ABOL), the parent PAA without Nic, but at a two- to fourfold lower required polymer dose. N-phenylation of the nicotinamide functionality even further reduces the required polymer dose to form stable polyplexes, which is a major improvement for these kinds of cationic polymers." @default.
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• W2116345484 date "2014-12-01" @default.
• W2116345484 modified "2023-09-25" @default.
• W2116345484 title "Intercalating quaternary nicotinamide-based poly(amido amine)s for gene delivery" @default.
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• W2116345484 doi "https://doi.org/10.1016/j.jconrel.2014.08.005" @default.
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