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El hemangioblasto genera células hematopoyéticas a través de una etapa de endotelio hemogénico
Christophe Lancrin1, Patrycja Sroczynska, Catherine Stephenson
1Cancer Research UK Stem Cell Biology Group.
Nature
|February 3, 2009
Resumen
El hemangioblasto genera células hematopoyéticas a través de un intermediario transitorio del endotelio hemogénico, vinculando dos teorías de desarrollo. Los factores de transcripción Tal1 y Runx1 son críticos para este proceso en el desarrollo embrionario.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- La hematopoyesis es la hematopoyesis.
- Biología de las células madre Biología de las células madre
Sus antecedentes:
- Existen dos teorías para el origen de las células hematopoyéticas: el hemangioblast (progenitor bipotencial) y el endotelio hemogénico (célula endotelial diferenciada con potencial hematopoyético).
- Las células formadoras de colonias de blastos (BL-CFC) en la diferenciación de células madre embrionarias de ratón apoyan el concepto de hemangioblastos, pero el mecanismo de generación sigue sin estar claro.
Objetivo del estudio:
- Para dilucidar el mecanismo por el cual los hemangioblastos generan células hematopoyéticas.
- Investigar el papel de los hemangioblastos y el endotelio hemogénico en el desarrollo hematopoyético.
- Para vincular las teorías de los hemangioblastos y el endotelio hemogénico.
Principales métodos:
- Diferenciación in vitro de células madre embrionarias de ratón para identificar poblaciones precursoras.
- Cultivo de células de embriones de ratón gastrulante.
- Análisis molecular de la participación del factor de transcripción (Tal1 y Runx1).
Principales resultados:
- Los hemangioblastos generan células hematopoyéticas a través de un intermediario transitorio del endotelio hemogénico.
- Esta población de endotelio hemogénico está presente durante el desarrollo de BL-CFC y en embriones de ratón en gastrulación.
- Tal1 es esencial para el establecimiento del endotelio hemogénico, mientras que Runx1 es crítico para la generación de células hematopoyéticas a partir de él.
Conclusiones:
- El estudio fusiona las teorías de los hemangioblastos y el endotelio hemogénico en un solo proceso de desarrollo lineal.
- Los hemangioblastos generan células hematopoyéticas a través de un intermediario del endotelio hemogénico.
- Tal1 y Runx1 juegan roles distintos y críticos en esta vía de desarrollo.
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