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La vía de señalización de Gridlock forma la primera arteria embrionaria
1Cardiovascular Research Center, Massachusetts General Hospital, Department of Medicine, Harvard Medical School, Charlestown 02129, USA.
Nature
|November 9, 2001
Resumen
El estudio revela cómo se desarrollan las arterias y las venas a partir de precursores mixtos en el pez cebra. Un gen llamado gridlock (grl), regulado por la señalización Notch, guía a estas células para que se conviertan en arteriales o venosas.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología Vascular Biología Vascular
- Genética La genética.
Sus antecedentes:
- Las arterias y venas exhiben características morfológicas, funcionales y moleculares distintas.
- Los mecanismos de desarrollo que establecen la diferenciación arteria-venosa durante la vasculogénesis siguen siendo en gran medida desconocidos.
Objetivo del estudio:
- Investigar las vías moleculares que gobiernan las decisiones iniciales del destino de las células arteriales-venosas durante el desarrollo embrionario.
- Aclarar el papel del gen gridlock (grl) y la señalización Notch en el establecimiento de patrones vasculares.
Principales métodos:
- Seguimiento de linaje en embriones de pez cebra para rastrear los destinos de los precursores de angioblastos.
- Análisis de la expresión génica de los marcadores arteriales (efrina-B2) y venosos (receptor EphB4).
- Manipulación genética utilizando mutaciones y antisenso morfolino para alterar el gridlock (grl) y la señalización Notch (Su(H)).
Principales resultados:
- Los precursores de los angioblastos para las arterias y las venas están inicialmente mezclados espacialmente.
- La expresión de Gridlock (grl) está restringida a los precursores arteriales y es crucial para la formación de arterias.
- La reducción de la señalización de grl o Notch conduce a la conversión de destino arterial a venoso, evidenciada por cambios en la expresión de marcadores.
Conclusiones:
- Una vía de señalización Notch-gridlock (grl) dicta el destino de las células arteriales durante el desarrollo vascular embrionario temprano.
- Esta vía parece juzgar la decisión específica del destino celular arterial versus venoso de los precursores inicialmente no comprometidos.
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