Molecular Engineering as an Approach To Modulate Gene Delivery Efficiency of Peptide-Modified Gemini Surfactants

Area of Science:

• Biomaterials Science
• Chemical Engineering
• Molecular Biology

Background:

• Diquaternary ammonium gemini surfactants offer enhanced nucleic acid complexation and low cytotoxicity.
• Exploring structural modifications is crucial for optimizing their potential as gene delivery vectors.

Purpose of the Study:

• To synthesize and evaluate novel peptide-modified gemini surfactants for gene delivery.
• To establish a structure-activity relationship for these modified surfactants.
• To identify key architectural requirements for effective gene delivery systems.

Main Methods:

• Synthesis of 22 novel peptide-modified gemini surfactants with varied alkyl tails and peptide spacers.
• In vitro assessment of transfection efficiency and cytotoxicity.
• Evaluation of the impact of hydrocarbon linkers within peptide chains.

Main Results:

• The glycyl-lysine modified gemini surfactant with a hexadecyl tail (16-7N(G-K)-16) exhibited the highest transfection efficiency and lowest cytotoxicity.
• This optimized surfactant showed an 8-fold increase in secreted protein and a 20% increase in cell viability compared to unsubstituted analogs.
• Increasing peptide size reduced efficiency, while hydrocarbon linkers modulated efficiency based on peptide length.

Conclusions:

• A balance between hydrophilic and hydrophobic properties is essential for effective gene delivery.
• Peptide modification and linker strategies can significantly tune gemini surfactant performance.
• The study provides fundamental insights into designing advanced gene delivery systems.