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Early cell loss after angioplasty results in a disproportionate decrease in percutaneous gene transfer to the vessel
1Division of Cardiovascular Research, St. Elizabeth's Medical Center, Tufts University School of Medicine, Boston, MA 02135-2997, USA.
Human Gene Therapy
|April 21, 1999
Summary
Balloon angioplasty intensity significantly impacts early arterial cell loss and reduces gene delivery efficiency. Higher balloon-to-artery ratios cause more cell loss and less effective percutaneous gene transfer in rabbit iliac arteries.
Area of Science:
- Vascular Biology
- Interventional Cardiology
- Gene Therapy
Background:
- Acute cell loss is a known complication after angioplasty in normal arteries.
- Understanding the impact of injury intensity on cell loss and gene delivery is crucial for optimizing procedures.
Purpose of the Study:
- To analyze the effects of varying balloon angioplasty injury intensity on early cellular loss.
- To investigate how injury intensity influences the efficiency of percutaneous gene delivery to the vessel wall.
Main Methods:
- Rabbits (n=52) underwent single- and double-injury iliac angioplasties using different balloon-to-artery (B/A) ratios (2.5-mm and 3.0-mm balloons).
- Medial and neointimal cellularity were assessed at 3 days post-injury.
- Adenovirus-mediated beta-galactosidase gene delivery was performed (n=24) to evaluate transgene expression efficiency.
Main Results:
- The 3.0-mm balloon (higher B/A ratio) caused significant medial cell loss (61% in single, 91% in double injury) compared to the 2.5-mm balloon.
- Double injury exacerbated cell loss, particularly in the media.
- Larger B/A ratios significantly reduced adenovirus-mediated gene transfer efficiency in both single and double injury models.
Conclusions:
- Early cell loss following balloon angioplasty is directly dependent on injury intensity.
- Greater cell loss occurs in the media compared to the neointima.
- Increased balloon-to-artery ratios impair percutaneous gene delivery efficiency.