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Sonic hedgehog y Fgf-4 actúan a través de una cascada de señalización y un bucle de retroalimentación para integrar
E Laufer1, C E Nelson, R L Johnson
1Department of Genetics Harvard Medical School, Boston, Massachusetts 02115.
Cell
|December 16, 1994
Resumen
Sonic hedgehog y Fgf-4 son señales clave para el desarrollo de las extremidades. Interactúan en un bucle de retroalimentación, con Sonic hedgehog iniciando señales secundarias y Fgf-4 permitiendo la respuesta del mesodermo.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- El desarrollo de las extremidades depende de la señalización de la zona de actividad polarizante (mesodermo posterior) y la cresta ectodérmica apical (AER).
- Sonic hedgehog (Shh) y el factor de crecimiento de fibroblastos-4 (Fgf-4) se identifican como moléculas de señalización cruciales en este proceso.
Objetivo del estudio:
- Para aclarar los roles específicos de Sonic hedgehog y Fgf-4 en el desarrollo temprano de las extremidades.
- Investigar las interacciones regulatorias entre estas moléculas de señalización y sus efectos aguas abajo.
Principales métodos:
- Manipulación quirúrgica para regular ectópicamente las actividades de Sonic hedgehog y Fgf-4 en el desarrollo de las extremidades.
- Análisis de patrones de expresión génica y vías de señalización en respuesta a la señalización alterada.
Principales resultados:
- Sonic hedgehog induce directamente moléculas de señalización secundarias, incluyendo Bmp-2 en el mesodermo y Fgf-4 en el ectodermo.
- Los factores de competencia ectodérmica, como Fgf-4, son esenciales para la activación del gen mesodérmico en respuesta al Sonic hedgehog.
- Un bucle de retroalimentación positiva entre el mesodermo posterior y el AER coordina la expresión de Sonic hedgehog y Fgf-4.
Conclusiones:
- Sonic hedgehog y Fgf-4 funcionan de manera coordinada para regular el crecimiento y el patrón de las extremidades.
- La interacción entre Shh y Fgf-4, mediada por un bucle de retroalimentación, es fundamental para integrar el crecimiento y las señales de patrones durante el desarrollo de las extremidades.
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