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La hemodinámica determinada por un programa genético rige el desarrollo asimétrico del arco aórtico
Kenta Yashiro1, Hidetaka Shiratori, Hiroshi Hamada
1Developmental Genetics Group, Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamada-oka, Suita, Osaka 565-0871, Japan. k.yashiro@qmul.ac.uk
Nature
|November 13, 2007
Resumen
Este estudio revela cómo Pitx2 (un gen clave) controla el desarrollo del corazón y el flujo sanguíneo para garantizar que los órganos se formen en el lado correcto. Este hallazgo aclara los mecanismos detrás de los defectos cardíacos congénitos y la lateralidad de los órganos viscerales.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Genética La genética.
- Ciencias Cardiovasculares Ciencias Cardiovasculares
Sus antecedentes:
- La lateralidad de los órganos de los vertebrados se establece mediante la señalización nodal asimétrica.
- Los defectos en este proceso conducen al síndrome de heterotaxia y afecciones cardíacas congénitas.
- Pitx2 es un factor de transcripción crucial para la morfogénesis asimétrica izquierda-derecha.
Objetivo del estudio:
- Para dilucidar los mecanismos celulares y moleculares subyacentes a la morfogénesis asimétrica.
- Investigar el papel de Pitx2 en el desarrollo del sistema de la arteria del arco branquial (BAA) y la lateralidad del arco aórtico.
Principales métodos:
- Ablación de la expresión unilateral de Pitx2 en modelos de ratón.
- Análisis de la lateralidad del arco aórtico y remodelación del BAA.
- Investigación de la contribución de las células a la remodelación arterial.
- Evaluación de la morfología del tracto de salida del corazón y la dinámica del flujo sanguíneo.
- Examen de las vías de señalización aguas abajo (PDGFR, VEGFR2).
Principales resultados:
- La ablación unilateral de Pitx2 interrumpió la remodelación asimétrica de BAA, lo que condujo a la lateralidad aleatoria del arco aórtico.
- Las células que expresan Pitx2 no formaron directamente las arterias remodeladas.
- Pitx2 indujo un cambio morfológico en el tracto de salida del corazón, creando un flujo sanguíneo asimétrico al sexto BAA.
- Las fuerzas hemodinámicas, impulsadas por este flujo asimétrico, estabilizaron la sexta BAA izquierda y causaron la regresión de la derecha, estableciendo la formación del arco aórtico del lado izquierdo.
Conclusiones:
- La hemodinámica, orquestada por cambios en el tracto de salida inducidos por Pitx2, es el principal impulsor de la remodelación asimétrica de la gran arteria.
- Este estudio aclara las bases moleculares y celulares de la asimetría de órgano visceral y arco aórtico izquierda-derecha.
- Los hallazgos proporcionan información sobre la etiología del síndrome de heterotaxia y de los defectos cardíacos congénitos.
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