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La beta3-integrina media la acumulación de células musculares lisas en el neointima después de la ligadura carotídea
Eric T Choi1, M Faisal Khan, Jeremy E Leidenfrost
1Department of Surgery, Washington University School of Medicine, St Louis, Mo, USA. choie@msnotes.wustl.edu
Circulation
|March 10, 2004
Resumen
La alfa ((v) beta3-integrina juega un papel clave en el engrosamiento neointimal después de la ligadura arterial. Los ratones con deficiencia de beta3-integrina muestran una reducción en la formación de lesiones debido a la disminución de la migración de las células del músculo liso.
Área de la Ciencia:
- Biología vascular Biología vascular
- Se integra en la señalización.
- Investigaciones cardiovasculares en la investigación cardiovascular.
Sus antecedentes:
- El bloqueo farmacológico de las beta3-integrinas inhibe la formación de lesiones neointimales en modelos animales.
- Los ratones con deficiencia de beta3-integrina (beta3-/-) no están protegidos contra la formación de lesiones neoinimales después de una lesión arterial, en contraste con los hallazgos anteriores.
Objetivo del estudio:
- Investigar la discrepancia en el papel de la beta3-integrina en la formación de lesiones neointimales utilizando diferentes modelos de lesiones en ratones beta3-/- y de tipo salvaje.
- Aclarar los subtipos específicos de integrina involucrados (alfa ((v)) beta3 frente a alfa ((IIb)) beta3).
Principales métodos:
- Comparación del engrosamiento neointimal en beta3-/- y ratones de tipo salvaje después de la ligadura de la arteria carótida y/o la interrupción de la sonda transluminal.
- Se evaluó la migración de las células del músculo liso (SMC), la apoptosis y la proliferación.
- Realizó experimentos de trasplante de médula ósea para confirmar el papel de integrinas específicas.
Principales resultados:
- No hay diferencia significativa en el engrosamiento neointimal después de la interrupción de la sonda transluminal.
- Reducción del engrosamiento neointimal en ratones beta3-/- después de la ligadura carotídea, relacionado con la disminución de la migración de SMC.
- La formación neointimal ocurrió sólo en el sitio de la interrupción medial en modelos de lesiones combinadas.
- El trasplante de médula ósea confirmó la importancia de alpha(v) beta3 en la respuesta atenuada.
Conclusiones:
- La alfa ((v) beta3-integrina media la acumulación de SMC íntima que contribuye al engrosamiento neointimal después de la ligadura arterial.
- El papel de las beta3-integrinas en la formación de lesiones neointimales depende del tipo de lesión arterial.
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