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GSK-3beta regula la fosforilación de CRMP-2 y la polaridad neuronal

Takeshi Yoshimura¹, Yoji Kawano, Nariko Arimura

¹Department of Cell Pharmacology, Graduate School of Medicine, Nagoya University, 65 Tsurumai, Showa-ku, Nagoya, Aichi 466-8550, Japan.

|January 18, 2005

Resumen

La glicogena sintetasa quinasa-3beta (GSK-3beta) inactiva la proteína mediadora de la respuesta de colapsina-2 (CRMP-2) por fosforilación, lo que impide la formación de axones. La neurotropina-3 (NT-3) desactiva GSK-3beta, promoviendo el crecimiento del axón mediante la activación de CRMP-2.

Área de la Ciencia:

La neurociencia es la neurociencia.
Biología celular Biología celular.
Biología Molecular Biología Molecular

Sus antecedentes:

Las neuronas exhiben estructuras distintas de axones y dendritos cruciales para la función.
La proteína mediadora de la respuesta de la colapsina-2 (CRMP-2) es vital para la polaridad neuronal y el alargamiento de las neuritas.
La dinámica de los microtúbulos es esencial para el desarrollo neuronal y la polarización.

Objetivo del estudio:

Para investigar el papel de la glucógeno sintasa kinasa-3beta (GSK-3beta) en la regulación de la actividad de CRMP-2 y la polaridad neuronal.
Para dilucidar el mecanismo por el cual la neurotropina-3 (NT-3) influye en el crecimiento del axón.
Para determinar la relación entre la fosforilación GSK-3beta de CRMP-2 y la polarización neuronal.

Principales métodos:

Utilizó cultivos de neuronas del hipocampo para la manipulación experimental.
Técnicas empleadas como la expresión génica (CRMP-2 no fosforilado, GSK-3beta constitutivamente activo), la inhibición de enzimas (GSK-3beta) y la eliminación de genes (CRMP-2).
Se evaluó la morfología neuronal, específicamente la formación de axones y neuritas, y el estado de fosforilación de CRMP-2.

Principales resultados:

GSK-3beta fosforila CRMP-2 en Thr-514, lo que lleva a su inactivación.
La inhibición de GSK-3beta o la expresión de CRMP-2 no fosforilado promueve la formación de neuritas múltiples similares a los axones.
El GSK-3beta activo perjudica la polarización neuronal, un efecto contrarrestado por el CRMP-2 no fosforilado.
El tratamiento con NT-3 inactiva GSK-3beta y reduce la fosforilación de CRMP-2.
La desactivación de CRMP-2 bloquea el crecimiento excesivo del axón inducido por NT-3.

Conclusiones:

GSK-3beta regula la polaridad neuronal mediante la fosforilación y la inactivación de CRMP-2.
NT-3 promueve el crecimiento de los axones mediante la desfosforilación de CRMP-2 a través de la inactivación de GSK-3beta.
CRMP-2 es un mediador clave de la señalización NT-3 en el desarrollo del axón.

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