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Succinylated Polyethylenimine Derivatives Greatly Enhance Polyplex Serum Stability and Gene Delivery In Vitro
Biomacromolecules
|October 26, 2018
Summary
Modified polyethylenimine (zPEI) enhances gene delivery, especially in serum conditions. Moderate succinylation improves transfection efficiency by balancing polymer/DNA interaction strength for better nucleic acid delivery.
Area of Science:
- Biomaterials Science
- Gene Therapy
- Polymer Chemistry
Background:
- Polymeric materials are promising for nucleic acid delivery but often lack clinical viability.
- Polyethylenimine (PEI) is a common gene delivery vector but faces biocompatibility and efficiency challenges.
Purpose of the Study:
- To develop zwitterion-like derivatives of polyethylenimine (zPEI) for improved gene delivery.
- To investigate the impact of succinylation on PEI's properties and gene transfection efficacy.
Main Methods:
- Synthesized zPEI by modifying PEI's amines with succinic anhydride.
- Characterized zPEI/DNA interactions, buffering capacity, and polyplex stability.
- Evaluated transfection efficiency in vitro, with and without serum presence.
Main Results:
- Succinylation decreased PEI's protonation constant and buffering capacity.
- zPEI polyplexes showed reduced aggregation in serum.
- zPEI (9-25% succinylation) significantly enhanced gene expression (up to 51-fold) in serum compared to PEI.
- Optimal gene delivery was observed within a specific range of succinylation, balancing binding strength and cargo release.
Conclusions:
- Succinylation of PEI creates zwitterionic derivatives (zPEI) that improve gene delivery efficiency and biocompatibility.
- zPEI enhances transfection in serum by modulating polyplex stability and DNA release.
- Careful control of succinylation is crucial for optimizing gene delivery performance.
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