Angiopoietin-1 promotes functional neovascularization that relieves ischemia by improving regional reperfusion in a swine chronic myocardial ischemia model.
J Biomed Sci
; 13(4): 579-91, 2006 Jul.
Article
em En
| MEDLINE
| ID: mdl-16547766
ABSTRACT
This study investigates the long-term angiogenic effects of ANG-1 and VEGF in a swine chronic myocardial ischemia model. Four-weeks after gradual occlusion of the left circumflex coronary artery by ameroid constrictor, animals were injected with recombinant adenoviral vectors carrying either human ANG-1 (n=9), human VEGF(165) (n=10) or empty vector (n=7) into the left ventricle free wall supplied by the constricted artery. Left ventricular perfusion in animals that received AdANG-1 (3.25+/-0.16 ml/min/g, p<0.05) recovered robustly 4 weeks after gene transfer while ischemia persisted in the AdVEGF (1.09+/-0.13 ml/min/g) and empty vector (1.20+/-0.03 ml/min/g) groups. Microvascular densities in the left ventricles of animals that received AdANG-1 (19.61+/-1.76/0.572 mm(2) myocardial tissue, p<0.05) and AdVEGF (18.17+/-1.43/0.572 mm(2) myocardial tissue, p<0.05) were significantly higher than animals that received empty vector (13.53+/-0.92/0.572 mm(2) myocardial tissue) 12 weeks after gene transfer. ANG-1, but not VEGF, contributed to enhanced regional perfusion by increasing arteriolar density (1.9+/-0.4/0.572 mm(2) myocardial tissue vs. 0.7+/-0.2/0.572 mm(2) myocardial tissue, p<0.05) of large-sized (50-100 microm) arterioles. These data demonstrate that gene transfer of ANG-1 and VEGF enhances angiogenesis, but ANG-1 promotes sustained improvement of ventricular perfusion that expedites recovery of ischemic myocardium via arteriogenesis.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Terapia Genética
/
Reperfusão Miocárdica
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Isquemia Miocárdica
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Neovascularização Fisiológica
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Angiopoietina-1
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Fator A de Crescimento do Endotélio Vascular
/
Vetores Genéticos
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
J Biomed Sci
Ano de publicação:
2006
Tipo de documento:
Article