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Remodelación celular hiperplásica de los medios en los aneurismas ascendentes de la aorta torácica ascendente
Paul C Y Tang1, Michael A Coady, Constantinos Lovoulos
1Department of Surgery, Yale University School of Medicine, New Haven, CT, USA.
Circulation
|August 24, 2005
Resumen
Los aneurismas aórticos torácicos ascendentes implican una expansión medial con una densidad de células del músculo liso vascular (VSMC) preservada, a diferencia de los aneurismas abdominales. Esto sugiere un mecanismo diferente que implica la degeneración de la matriz y la hiperplasia celular en lugar de la atrofia.
Área de la Ciencia:
- Investigación cardiovascular Investigación cardiovascular Investigación cardiovascular Investigación cardiovascular Investigación cardiovascular
- Enfermedad aórtica fisiopatología fisiopatología.
- Biología Vascular Biología Vascular
Sus antecedentes:
- Los aneurismas aórticos torácicos ascendentes (AAT) a menudo están relacionados con la degeneración medial.
- La apoptosis extensiva de las células musculares lisas vasculares (VSMC) se observa en los aneurismas de la aorta abdominal (aAAs).
- El papel de la pérdida de VSMC en aTA sigue sin estar claro.
Objetivo del estudio:
- Para investigar si se produce atrofia medial en los aneurismas primarios ascendentes de la aorta torácica.
- Para comparar la composición celular y matriz de los medios en las aortas torácicas ascendentes no aneurismáticas y aneurismáticas.
Principales métodos:
- Análisis morfométrico de 28 aortas torácicas ascendentes no aneurismáticas y 29 aneurismáticas.
- Medición del grosor de la capa vascular y cálculo del área del compartimento vascular.
- Evaluación de la composición celular y matriz medial a nivel estructural, proteico y de transcripción.
Principales resultados:
- A pesar del adelgazamiento de los medios debido a la dilatación, el área medial general aumentó en los aneurismas.
- La densidad de las células del músculo liso vascular (VSMC) se conservó, lo que indica hiperplasia celular.
- Se observó una disminución de la expresión de proteínas de la matriz y un aumento de la degradación de la matriz, con la remodelación más evidente en aneurismas más pequeños.
Conclusiones:
- Los mecanismos de agrandamiento luminal difieren entre los aneurismas de la aorta torácica y abdominal con respecto a la supervivencia de VSMC y la atrofia medial.
- Ambos tipos de aneurisma comparten la degeneración de la matriz como una característica fisiopatológica común.
- La remodelación celular hiperplástica de los medios en aTAs puede ser una respuesta adaptativa al aumento de la tensión de la pared.
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