Long-term expression with a cationic polymer derived from a natural polysaccharide: schizophyllan

Area of Science:

• Biomaterials Science
• Gene Therapy
• Polymer Chemistry

Background:

• Cationic polymers with polysaccharide backbones are explored as nonviral gene vectors due to low immunogenicity and high solubility.
• Schizophyllan, a clinically administered beta-(1,3)-glucan, possesses confirmed safety and allows for selective functionalization.

Purpose of the Study:

• To synthesize and evaluate novel oligoamine conjugates derived from schizophyllan as gene delivery vectors.
• To compare the in vitro transfection efficiency and cytotoxicity of these novel carriers against established vectors like polyethylenimine.

Main Methods:

• Synthesis of various oligoamine conjugates from schizophyllan by functionalizing its side chain.
• In vitro assessment of gene transfection efficiency by adjusting carrier molecular weight and amination degree.
• Evaluation of cytotoxicity and optimization through PEGylation and DNA complex concentration.

Main Results:

• Cationic schizophyllan conjugates demonstrated superior in vitro transfection efficiencies compared to polyethylenimine.
• Cytotoxicity was reduced by optimizing DNA complex per cell and most effectively mitigated through PEGylation.
• These carriers facilitated prolonged reporter protein expression, indicating extended plasmid DNA residence time in cells.

Conclusions:

• Cationic schizophyllan conjugates represent a promising class of safe and effective nonviral gene delivery vectors.
• Optimized schizophyllan-based carriers offer enhanced gene delivery performance and reduced toxicity for potential therapeutic applications.
• The ability to prolong gene expression highlights the potential of schizophyllan derivatives in advanced gene therapy strategies.