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La hipercolesterolemia inhibe la angiogénesis en respuesta a la isquemia de las extremidades traseras: mecanismo
1Cardiovascular Research Institute and Department of Internal Medicine III, Kurume University School of Medicine, Kurume, Japan.
Circulation
|November 18, 2000
Resumen
El colesterol alto perjudica la formación de vasos sanguíneos después de la isquemia de las extremidades en ratas. La suplementación oral de L-arginina mejoró la angiogénesis al aumentar la actividad del óxido nítrico (NO).
Área de la Ciencia:
- Biología Cardiovascular Biología Cardiovascular
- Biología Vascular Biología Vascular
- La Medicina Regenerativa es una Medicina Regenerativa.
Sus antecedentes:
- El óxido nítrico derivado del endotelio (EDNO) regula la angiogénesis.
- La hipercolesterolemia (HC) perjudica la liberación de EDNO.
- HC puede inhibir la angiogénesis post-isquemia a través de la reducción de EDNO.
Objetivo del estudio:
- Para investigar si HC inhibe la angiogénesis inducida por isquemia mediante la reducción de EDNO.
- Para determinar si la suplementación con L-arginina puede prevenir el deterioro de la angiogénesis relacionado con la HC.
Principales métodos:
- Las ratas fueron alimentadas con dietas estándar, altas en colesterol (HC) o HC con L-arginina.
- La isquemia unilateral de las extremidades posteriores fue inducida quirúrgicamente.
- Se analizaron el flujo sanguíneo, la angiografía, la densidad capilar y los niveles de NO (x) / cGMP en los tejidos.
Principales resultados:
- El HC redujo significativamente el flujo sanguíneo, la angiogénesis y la densidad capilar en extremidades isquémicas.
- La HC se asoció con una disminución de la biodisponibilidad de óxido nítrico (NO) en los tejidos.
- La suplementación con L-arginina mejoró significativamente el flujo sanguíneo y la angiogénesis en ratas HC.
Conclusiones:
- La hipercolesterolemia inducida por la dieta atenúa la angiogénesis después de la isquemia de las extremidades posteriores.
- La reducción de la biodisponibilidad de NO es un mecanismo probable para el deterioro de la angiogénesis en HC.
- La suplementación con L-arginina restauró efectivamente la angiogénesis en ratas HC.
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