Targeted high-efficiency, homogeneous myocardial gene transfer.

Area of Science:

• Cardiovascular Research
• Gene Therapy
• Molecular Medicine

Background:

• Myocardial gene therapy holds promise for cardiac disease but is hindered by inefficient in vivo delivery methods.
• Developing effective gene transfer techniques is essential for clinical translation in large mammals and humans.

Purpose of the Study:

• To develop a high-efficiency, homogeneous myocardial gene transfer method for large mammals, adaptable for human use.
• To overcome limitations in current in vivo gene delivery for cardiac applications.

Main Methods:

• Utilized a porcine model (81 piglets) with coronary catheterization for viral vector delivery into the left anterior descending artery (LAD) and/or great cardiac vein.
• Investigated effects of viral vectors, VEGF, nitroglycerin, adenosine, and calcium concentration on gene transfer efficiency.
• Optimized physical parameters, including simultaneous infusion through LAD and great cardiac vein.

Main Results:

• Simultaneous infusion into both LAD and great cardiac vein yielded the highest gene transfer efficiency, reaching 78+/-6% of myocytes.
• The optimized method targeted a larger myocardial area homogeneously.
• The procedure was well-tolerated in the animal model.

Conclusions:

• A novel, dual-coronary artery infusion technique enables targeted, homogeneous, and high-efficiency myocardial gene transfer in a large animal model.
• This method shows significant potential for translation to human clinical applications in treating cardiac diseases.