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Quaternary ammonium polysaccharides for gene delivery
Ira Yudovin-Farber1, Chava Yanay, Tony Azzam
1Department of Medicinal Chemistry and Natural Products, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, P.O.B. 12065 Jerusalem 91120, Israel.
Bioconjugate Chemistry
|September 22, 2005
Summary
New cationic polysaccharides were synthesized for gene delivery but showed lower transfection efficiency than expected. The dextran-spermine conjugate remained a more effective gene vector in cell line studies.
Area of Science:
- Biomaterials Science
- Gene Therapy
- Polymer Chemistry
Background:
- Gene transfection requires efficient and safe delivery vectors.
- Cationic polysaccharides are explored as non-viral gene delivery systems.
- Oxidized dextran can be functionalized to create novel polycations.
Purpose of the Study:
- To synthesize and evaluate novel cationic polysaccharides for gene transfection.
- To investigate the gene delivery capabilities of dextran grafted with monoquaternary (MQ) ammonium oligoamines.
- To compare the transfection efficiency of these novel polycations with a known effective vector.
Main Methods:
- Synthesis of cationic polysaccharides via reductive amination of oxidized dextran with MQ ammonium oligoamines.
- Testing gene transfection of pCMV-GFP and beta-Gal plasmids on EPC and HEK-293 cell lines.
- Characterization of polycation complexation with DNA based on increased cationic charge.
Main Results:
- Synthesized polycations demonstrated lower gene transfection yields compared to the parent vector.
- The dextran-spermine conjugate showed high in vitro and in vivo transfection effectiveness.
- Despite increased surface cationic charge, novel polycations did not enhance transfection efficiency.
Conclusions:
- Grafting MQ ammonium oligoamines onto oxidized dextran did not improve gene transfection efficiency.
- The dextran-spermine conjugate remains a superior gene delivery vector.
- Further research is needed to optimize cationic polysaccharide structures for effective gene therapy.