Focal arterial transgene expression after local gene delivery

Area of Science:

• Cardiovascular Research
• Gene Therapy
• Vascular Biology

Background:

• Gene therapy for vascular disease faces challenges with low transfection efficiency and adverse biological responses.
• Developing effective gene delivery methods is crucial for successful vascular disease treatment.

Purpose of the Study:

• To evaluate the transfection efficiency of liposome/DNA complexes delivered via local catheter or systemic administration into balloon-injured rabbit arteries.
• To assess the feasibility of gene therapy for vascular applications.

Main Methods:

• Cationic liposomes were complexed with a plasmid encoding alkaline phosphatase (AP) reporter gene.
• Transfection efficiency and transgene persistence were optimized in cultured vascular smooth muscle cells (SMC).
• In vivo studies utilized a local delivery catheter for iliac artery transfection and systemic ear vein injection in balloon-injured rabbits.

Main Results:

• In vitro, AP expression in SMC persisted for 28 days, with proliferation enhancing transfection 12-fold.
• Local delivery in vivo resulted in focal transgene expression in all three arterial layers by day three.
• Systemic delivery showed lower transfection rates, and transgene expression was limited to injured arteries.

Conclusions:

• Liposome-mediated gene delivery via local catheter is effective in transfecting all vessel layers in vivo.
• This method offers a potential therapeutic strategy for atherosclerosis and restenosis.
• Further refinement is needed to address unwanted transfection at distant sites.