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Grafting chitosan with polyethylenimine in an ionic liquid for efficient gene delivery
Huiying Chen1, Shaohui Cui2, Yinan Zhao1
1State Key Laboratory of Fine Chemicals, Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, Dalian, Liaoning, China; Key Laboratory of Biotechnology and Bioresources Utilization-The State Ethnic Affairs Commission-Ministry of Education, College of Life Science, Dalian Nationalities University, Dalian, Liaoning, China.
Researchers developed a novel method to graft polyethylenimine (PEI) onto chitosan (CS) using ionic liquids, significantly improving gene transfection efficiency. This modified chitosan-graft-polyethylenimine (CS-g-PEI) shows enhanced performance with low cytotoxicity.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Gene Delivery Systems
Background:
- Chitosan (CS) modification with polyethylenimine (PEI) enhances gene transfection.
- Efficiently grafting PEI onto water-insoluble CS remains a challenge.
- Controlled modification is crucial for optimizing gene delivery vectors.
Purpose of the Study:
- To develop a novel, efficient method for grafting PEI onto water-insoluble CS.
- To investigate the properties and gene transfection capabilities of the synthesized CS-g-PEI copolymers.
- To optimize the grafting process for improved gene delivery.
Main Methods:
- Utilized ionic liquid (1-butyl-3-methyl imidazolium acetate, [BMIM]Ac) as a solvent for CS.
- Employed 1,1-carbonyldiimidazole (CDI) as a linking agent for PEI grafting onto CS.
- Characterized CS-g-PEI using 1H NMR, FTIR, GPC, Agarose gel electrophoresis, and Dynamic Light Scattering (DLS).
Main Results:
- A novel grafting method using [BMIM]Ac and CDI was established, shortening reaction time to 4 hours.
- Chitosan-graft-polyethylenimine (CS-g-PEI) copolymers were synthesized with tunable grafting degrees (GD).
- CS-g-PEI demonstrated significantly enhanced pDNA-binding affinity, optimal particle size, and ζ-potential for transfection, achieving 44x higher efficiency than CS in HEp-2 cells with low cytotoxicity.
Conclusions:
- The developed ionic liquid-based method provides an efficient and controllable route for CS-g-PEI synthesis.
- CS-g-PEI copolymers exhibit superior gene transfection performance compared to unmodified CS and PEI.
- This CS-g-PEI system holds promise as a safe and effective non-viral gene delivery vector.
