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Inhibition of neointimal formation in porcine coronary artery by a Ras mutant
Background:
Therapeutic approaches to reduce the neointimal formation caused by balloon injury have been focused mainly on experimental models of restenosis in the rat carotid artery. However, restenosis in rat carotid artery may not replicate the coronary arterial responses to injury in larger animals and humans.
Methods:
In this study, we used pig coronary arteries as an animal model to evaluate the preventive effects of a virus-mediated dominant negative mutant RasN17 on balloon injury-induced restenosis. The viral particles were delivered to the balloon-injured coronary arteries via a dispatch catheter to keep the virus in a confined arterial segment for 10 min to reach optimal transfection. Six weeks after balloon injury, the pigs were sacrificed and the left anterior descending arteries were isolated for histological analysis.
Results:
Neointima formation was prominent in the group receiving balloon injury as compared with the uninjured controls. A remodeling process with migration of collagen was also found in the injured coronary arteries. The application of AdRasN17 led to a 56% decrease in neointima formation and a 75% increase in lumen size, as compared with the balloon-injured vessels treated with AdLacZ control.
Conclusions:
These results suggest that AdRasN17 is an effective therapeutic gene in preventing balloon injury-induced neointimal formation in pig coronary arteries.
Insights
A novel gene therapy using AdRasN17 significantly reduced neointimal hyperplasia after balloon injury in pig coronary arteries. This approach shows promise for preventing restenosis in human cardiovascular disease.
Area of Science:
- Cardiovascular Research
- Gene Therapy
- Vascular Biology
Background:
- Restenosis after balloon angioplasty is a significant clinical challenge.
- Current experimental models, like the rat carotid artery, may not accurately reflect human coronary artery responses.
- There is a need for more relevant animal models to study restenosis prevention strategies.
Purpose of the Study:
- To evaluate the efficacy of virus-mediated dominant negative mutant RasN17 (AdRasN17) in preventing balloon injury-induced restenosis.
- To utilize pig coronary arteries as a more relevant preclinical model for human cardiovascular responses.
- To assess the therapeutic potential of AdRasN17 gene delivery in a large animal model.
Main Methods:
- Pig coronary arteries were subjected to balloon injury.
- Viral particles (AdRasN17 or AdLacZ control) were delivered via a dispatch catheter to the injured segment.
- Histological analysis was performed six weeks post-injury to assess neointimal formation and lumen size.
Main Results:
- Balloon injury induced significant neointimal formation and arterial remodeling.
- AdRasN17 treatment resulted in a 56% reduction in neointimal hyperplasia compared to the AdLacZ control.
- The AdRasN17 group exhibited a 75% increase in lumen size, indicating improved vessel patency.
Conclusions:
- AdRasN17 demonstrates significant therapeutic potential in preventing neointimal formation in pig coronary arteries.
- This study validates the pig coronary artery model for evaluating restenosis therapies.
- Virus-mediated gene transfer of AdRasN17 is an effective strategy against balloon injury-induced vascular remodeling.