Dendronised block copolymers as potential vectors for gene transfection.

Area of Science:

• Polymer Chemistry
• Nanotechnology
• Gene Delivery

Background:

• Development of efficient and safe non-viral vectors is crucial for gene therapy.
• Block copolymers offer tunable properties for complexation and delivery of nucleic acids.
• Existing methods require optimization for enhanced DNA binding and controlled self-assembly.

Purpose of the Study:

• To synthesize novel block copolymers with cationic dendronized and poly(ethylene glycol) blocks.
• To investigate the DNA binding capabilities and self-assembly behavior of these copolymers.
• To evaluate the in vitro gene transfection efficiency and cytotoxicity of the developed polyion complexes.

Main Methods:

• Modular synthesis utilizing click chemistry and ring-opening metathesis polymerization.
• DNA complexation analysis via gel electrophoresis, dynamic light scattering (DLS), and transmission electron microscopy (TEM).
• In vitro transfection assays in HeLa cells using plasmid DNA encoding green fluorescent protein (GFP).

Main Results:

• All synthesized block copolymers effectively complexed DNA.
• Self-assembly into polyion complex micelles with hydrodynamic radii of 20-120 nm at pH 7.4 was observed.
• Promising in vitro transfection efficiency and low toxicity were demonstrated in HeLa cells.

Conclusions:

• The synthesized block copolymers are effective DNA complexing agents.
• These polymers form stable nanoparticles suitable for gene delivery applications.
• The developed materials represent potential safe and efficient non-viral gene vectors.