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Una vía de señalización Rac-cGMP.

Dagang Guo¹, Ying-cai Tan, Dawei Wang

¹Department of Physiology, Cornell University Weill Medical College, New York, NY 10021, and Division of Experimental Hematology, Children's Hospital Research Foundation, Cincinnati, OH 45229, USA.

|January 27, 2007

Resumen

La pequeña GTPasa Rac y la GMP cíclica (cGMP) son reguladores clave de las células. Este estudio revela que Rac utiliza PAK para activar las guanililciclasas, aumentando el cGMP para la migración celular y la formación de lamellipodium.

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Área de la Ciencia:

Las vías de señalización celular.
Mecanismos moleculares de la regulación de las células.
Bioquímica de los segundos mensajeros.

Sus antecedentes:

La pequeña GTPasa Rac y la GMP cíclica (cGMP) son cruciales para las funciones celulares.
La señalización de Rac generalmente involucra a la quinasa activada por p21 (PAK) como un efector aguas abajo.
El mecanismo que vincula los receptores de membrana a la regulación de la GMPc sigue sin estar claro.

Objetivo del estudio:

Para descubrir la vía de señalización que conecta Rac con el aumento celular de cGMP.
Para aclarar cómo Rac influye en los niveles de GMPc a través de sus efectores.
Comprender el papel de esta vía en la migración celular y la morfología.

Principales métodos:

Interacciones investigadas de Rac-PAK y su efecto sobre la actividad de la guanilil ciclasa (GC).
Se utilizaron ensayos basados en células para medir los niveles de GMPc.
Se examinó el papel de la vía Rac/PAK/GC/cGMP en la migración de células fibroblásticas y la formación de lamellipodium.

Principales resultados:

Se demostró que Rac, a través de PAK, activa directamente las ciclases de guanilil transmembrana (GC).
Se demostró que esta activación conduce a niveles elevados de GMPc intracelular.
Confirmó la participación de la vía Rac/PAK/GC/cGMP en la migración de células fibroblásticas inducida por el factor de crecimiento derivado de plaquetas y la formación de lamellipodium.

Conclusiones:

Estableció una nueva vía de señalización que vincula Rac a la producción de cGMP a través de PAK y GCs.
Conectado Rac y la señalización cGMP, dos reguladores críticos de la fisiología celular.
Proporcionó un mecanismo general para la modulación mediada por receptores de las respuestas fisiológicas a través de la elevación de cGMP.