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El receptor de netrina UNC5B media eventos de guía que controlan la morfogénesis del sistema vascular
Xiaowei Lu1, Ferdinand Le Noble, Li Yuan
1Department of Biological Sciences, Howard Hughes Medical Institute, Stanford University, Stanford, California 94305, USA.
Nature
|October 29, 2004
Resumen
El receptor de netrina repulsiva UNC5B guía el desarrollo vascular. Su alteración causa ramificaciones y navegación anormales de los vasos sanguíneos, revelando UNC5BB.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología Vascular Biología Vascular
- La neurociencia es la neurociencia.
Sus antecedentes:
- Los vasos sanguíneos y los nervios exhiben estructuras anatómicas complejas y ramificadas similares.
- Los mecanismos de guía precisos son cruciales para el correcto cableado de los sistemas vascular y nervioso.
- Si bien algunos reguladores de orientación de axones se encuentran en las células endoteliales, sus funciones conservadas en la orientación vascular siguen sin estar claras.
Objetivo del estudio:
- Para investigar el papel del receptor de netrina UNC5B en el desarrollo vascular.
- Para determinar si UNC5B funciona como una señal de guía en las células endoteliales.
Principales métodos:
- Estudios de alteración genética en ratones (knockout de Unc5b).
- Estudios de alteración genética en peces cebra (Unc5b y netrin-1a knockout).
- Análisis de la extensión de la filopodia de células de la punta endotelial, la ramificación de los vasos y la navegación.
Principales resultados:
- UNC5B se expresa por las células de la punta endotelial.
- La interrupción de Unc5b (ratones) o Unc5b / netrin-1a (pez cebra) dio lugar a una extensión filopodial aberrante, una ramificación excesiva de la embarcación y una navegación anormal.
- Retracción filopodial endotelial inducida por Netrin-1, específicamente en presencia de UNC5B.
Conclusiones:
- UNC5B actúa como un receptor de netrina repulsivo en las células endoteliales.
- UNC5B juega un papel crítico en el control de la morfogénesis vascular y la orientación.
- Este estudio pone de relieve los mecanismos de guía conservados entre los sistemas neuronal y vascular.
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