Gene transfer to coronary artery bypass conduits

Area of Science:

• Cardiovascular Research
• Gene Therapy
• Vascular Biology

Background:

• Saphenous vein grafts are prone to stenosis after coronary artery bypass grafting.
• Gene therapy offers a potential strategy to prevent graft stenosis.
• Adenoviral-mediated gene transfer methods were developed for canine saphenous veins.

Purpose of the Study:

• To investigate the feasibility of ex vivo adenoviral-mediated gene transfer to canine saphenous vein grafts.
• To assess transgene expression in vein grafts used for coronary artery bypass.

Main Methods:

• Canine saphenous vein segments were transduced ex vivo with adenovirus carrying the beta-galactosidase gene.
• Vein segments were used as coronary artery bypass grafts in a canine model.
• Transgene expression was quantified and localized 3 days post-procedure.

Main Results:

• Beta-galactosidase expression increased dose-dependently with viral titer.
• Significant differences in expression were observed between dosage groups and controls (p < 0.035).
• X-gal staining revealed transgene expression primarily in endothelial cells and scattered adventitial cells.

Conclusions:

• Ex vivo gene transfer into saphenous vein grafts is feasible in a canine model.
• This method facilitates therapeutic gene delivery to prevent or slow vein graft arteriosclerosis.
• Adenoviral gene transfer holds potential for improving outcomes in coronary artery bypass grafting.