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Internalización dependiente de la actividad de suavizado mediado por beta-arrestina 2 y GRK2
Wei Chen1, Xiu-Rong Ren, Christopher D Nelson
1Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA. w.chen@duke.edu
Science (New York, N.Y.)
|December 25, 2004
Resumen
La señalización de la vía Sonic Hedgehog (Shh) incluye la activación Smoothened (Smo). La G protein-coupled receptor kinase 2 (GRK2) y la beta-arrestina 2 median la endocitosis Smo, crucial para el desarrollo de los vertebrados.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- La señalización Sonic Hedgehog (Shh) es vital para el desarrollo de los vertebrados.
- El parcheado (Ptc) normalmente inhibe el suavizado (Smo), un receptor transmembrana clave.
- Los mecanismos precisos de la activación Smo y la señalización aguas abajo siguen siendo incompletamente entendidos.
Objetivo del estudio:
- Para identificar las moléculas que interactúan con Smoothened (Smo) durante la activación de la vía.
- Para dilucidar las funciones de estas moléculas que interactúan en la regulación y señalización de Smo.
- Investigar la participación de GRK2 y beta-arrestina 2 en el tráfico y la función de Smo.
Principales métodos:
- Pruebas de coinmunoprecipitación para detectar las interacciones de proteínas con Smo.
- Microscopía de fluorescencia para visualizar la localización de proteínas y la endocitosis.
- Tratamiento con Shh, agonistas de Smo y antagonistas de Smo (ciclopamina) para modular la actividad de la vía.
Principales resultados:
- La G protein-coupled receptor kinase 2 (GRK2) fosforila Smo después de la activación.
- La beta-arrestina 2 interactúa con Smo de una manera dependiente de la activación.
- Tanto GRK2 como beta-arrestina 2 promueven la endocitosis Smo a través de fosas recubiertas de clatrina, un proceso inhibido por Ptc pero aliviado por Shh.
Conclusiones:
- GRK2 y beta-arrestina 2 se identifican como nuevos socios de interacción de Smo. activado.
- Estas proteínas median la endocitosis de Smo, lo que sugiere un papel en la terminación o modulación de la señal.
- GRK2 y beta-arrestin 2 son potenciales mediadores clave en la vía de señalización del Sonic Hedgehog (Shh).
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