Characterization of transferrin-modified procationic-liposome protamine-DNA complexes

Area of Science:

• Biotechnology
• Nanotechnology
• Gene Therapy

Background:

• Non-viral gene delivery systems are crucial for therapeutic applications.
• Developing stable and efficient gene vectors remains a significant challenge.
• Transferrin modification can enhance cellular targeting of gene delivery systems.

Purpose of the Study:

• To develop and characterize a novel transferrin-modified non-viral gene delivery system, Tf-PLPD.
• To evaluate the stability, morphology, particle size, zeta potential, and transfection efficiency of Tf-PLPD.
• To assess the impact of lyophilization and serum on the system's performance and cytotoxicity.

Main Methods:

• Preparation of procationic liposomes using the film dispersion filter method.
• Condensation of plasmid DNA with protamine, followed by complexation with liposomes to form PLPD.
• Surface adsorption of transferrin onto PLPD via electrostatic interaction to yield Tf-PLPD.
• Characterization of Tf-PLPD for stability in rat serum, morphology, particle size, zeta potential, and transfection efficiency in HepG2 cells.

Main Results:

• Procationic liposomes demonstrated stability in rat serum for 24 hours.
• Tf-PLPD effectively protected plasmid DNA from enzymatic degradation, even after lyophilization.
• The average particle size of Tf-PLPD was 240+/-12 nm with a zeta potential of -24.10+/-2.5 mV.
• Transfection efficiencies reached 24.26+/-2.6 mU beta-galactosidase/mg protein, unaffected by lyophilization or serum.
• The system exhibited low cytotoxicity to HepG2 cells.

Conclusions:

• Tf-PLPD is a stable and effective non-viral gene delivery system.
• The transferrin modification enhances gene delivery capabilities without compromising stability or increasing toxicity.
• This novel system holds potential for various gene therapy applications due to its robustness and efficiency.