Optimizing the formulation of procationic liposomes-protamine-DNA complexes by response surface methodology.

Area of Science:

• Biotechnology
• Gene Delivery Systems
• Nanomedicine

Background:

• Non-viral gene delivery vectors are crucial for therapeutic applications.
• Procationic liposomes-protamine-DNA (PLPD) offer a promising non-viral gene delivery approach.
• Optimization of PLPD formulation is essential for maximizing efficacy.

Purpose of the Study:

• To optimize the formulation of procationic liposomes-protamine-DNA (PLPD) gene delivery vectors.
• To identify optimal parameters for PLPD particle size and transfectivity.
• To utilize response surface methodology (RSM) for efficient formulation optimization.

Main Methods:

• Response surface methodology (RSM) with a three-factor, five-level design was employed.
• Independent variables included protamine/DNA ratio, CHETA molar percent, and CHETA/DNA ratio.
• PLPD particle size and beta-galactosidase activity (transfectivity) were measured as response variables.

Main Results:

• Mathematical models and response surface plots were generated to correlate variables.
• Optimized levels of independent variables were predicted to achieve desired particle size and transfectivity.
• The optimized PLPD formulation exhibited a particle size of 228.9 ± 8.0 nm and transfectivity of 24.26 ± 2.60 mU/mg.

Conclusions:

• RSM effectively optimized PLPD formulation for enhanced gene delivery.
• The optimized PLPD vectors demonstrate favorable particle size and high transfectivity.
• This study provides a robust method for developing efficient non-viral gene delivery systems.