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IkappaB kinase-alfa actúa en la epidermis para controlar la morfogénesis esquelética y craneofacial
Alok K Sil1, Shin Maeda, Yuji Sano
1Laboratory of Gene Regulation and Signal Transduction, Department of Pharmacology, School of Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0636, USA.
Nature
|April 9, 2004
Resumen
IkappaB kinase-alfa (IKK-alfa) es crucial para la diferenciación epidérmica, que a su vez es esencial para el desarrollo esquelético y craneofacial normal. La restauración de IKK-alfa en la epidermis corrige estos defectos de desarrollo.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
- Genética La genética.
Sus antecedentes:
- IkappaB kinase-alfa (IKK-alfa) tiene funciones tanto dependientes como independientes de la kinasa.
- La actividad de la quinasa es vital para la organogénesis linfoide y el desarrollo de las glándulas mamarias.
- La actividad independiente de la quinasa es esencial para la diferenciación de los queratinocitos epidérmicos.
Objetivo del estudio:
- Investigar el papel de IKK-alfa en la diferenciación epidérmica y su impacto en la morfogénesis esquelética y craneofacial.
- Determinar si los defectos morfogenéticos en ratones con deficiencia de IKK-alfa se deben a la reducción de la actividad de NF-kappaB o al fracaso de la diferenciación epidérmica.
Principales métodos:
- Se generaron ratones con deficiencia de IKK-alfa con un transgen de Ikka específico de la epidermis.
- Se analizó la diferenciación epidérmica, la morfología esquelética y el desarrollo craneofacial en estos ratones.
- Examinó la expresión de los miembros de la familia del factor de crecimiento de los fibroblastos (FGF).
Principales resultados:
- Los ratones que carecían de IKK-alfa en todos los tipos de células excepto los queratinocitos epidérmicos basales mostraron diferenciación epidérmica normal y morfología esquelética.
- La diferenciación epidérmica es necesaria para la morfogénesis adecuada de los elementos esqueléticos derivados mesodérmicamente.
- IKK-alfa reprime la expresión de los miembros de la familia FGF, como FGF8, que están elevados en ratones con deficiencia de IKK-alfa.
Conclusiones:
- La diferenciación epidérmica mediada por IKK-alfa es esencial para el desarrollo esquelético y craneofacial normal.
- Los defectos morfogenéticos observados en ratones con deficiencia de IKK-alfa se deben principalmente a la diferenciación epidérmica fallida, no a la actividad reducida de NF-kappaB.
- IKK-alfa regula el desarrollo esquelético en parte mediante el control de la señalización de FGF en el ectoderma del capullo de la extremidad.
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