Dendronized chitosan derivative as a biocompatible gene delivery carrier

Area of Science:

• Biomaterials Science
• Gene Delivery Systems
• Nanotechnology

Background:

• Chitosan is a promising nonviral gene delivery vector, but its transfection efficiency needs improvement.
• Developing modified chitosan derivatives can enhance its properties for effective gene delivery.
• Nonviral vectors offer advantages over viral vectors, including lower immunogenicity and easier production.

Purpose of the Study:

• To synthesize and characterize a novel dendronized chitosan derivative for enhanced gene delivery.
• To evaluate the physicochemical properties, DNA complexation, and transfection efficiency of the new derivative.
• To compare the performance of the dendronized chitosan with unmodified chitosan and polyethyleneimine (PEI).

Main Methods:

• Synthesis of dendronized chitosan via copper-catalyzed azide alkyne cyclization.
• Structural characterization using (1)H NMR and FTIR.
• Evaluation of buffering capacity, DNA complexation (gel electrophoresis, zeta potential, particle size, TEM), in vitro transfection, and cytotoxicity assays.

Main Results:

• The dendronized chitosan derivative exhibited improved water solubility and buffering capacity compared to unmodified chitosan.
• Effective complexation with plasmid DNA was confirmed through various biophysical analyses.
• The derivative demonstrated enhanced transfection efficiency and lower cytotoxicity than polyethyleneimine (PEI) in human kidney 293T and CNE2 cell lines.

Conclusions:

• Dendronized chitosan is a superior nonviral gene delivery vector with enhanced physicochemical properties.
• This derivative offers a promising alternative to existing vectors like PEI, with potential for reduced toxicity.
• Further studies should explore the effect of serum and optimize conditions for in vivo applications.