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Published on: June 26, 2013
RIM1alpha se requiere para la potenciación presináptica a largo plazo
Pablo E Castillo1, Susanne Schoch, Frank Schmitz
1Nancy Friend Pritzker Laboratory, Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, California 94304, USA.
Nature
|January 18, 2002
Resumen
RIM1alpha es crucial para la potenciación a largo plazo de la fibra de musgo (LTP), un mecanismo clave en el aprendizaje y la memoria. Su ausencia suprime la LTP, lo que sugiere un papel vital en la plasticidad sináptica a través de la interacción Rab3A.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología celular Biología celular.
- La plasticidad sináptica.
Sus antecedentes:
- La potenciación a largo plazo (LTP) modela el aprendizaje y la memoria.
- La LTP de fibra de musgo, distinta de la LTP dependiente del receptor NMDA, incluye mecanismos presinápticos.
- Esta plasticidad ocurre en las sinapsis del hipocampo, del cerebelo y del corticotalamo, lo que requiere la proteína quinasa A.
Objetivo del estudio:
- Para investigar el papel de RIM1alpha, una proteína de zona activa, en la fibra de musgo LTP.
- Para determinar si RIM1alpha es esencial para el componente presináptico de esta plasticidad sináptica.
Principales métodos:
- Utilizó ratones knockout que carecían de RIM1alpha.
- Se examinó la fibra de musgo LTP en el hipocampo y el cerebelo de estos ratones.
- Investigó la interacción entre RIM1alpha y Rab3A en la liberación de vesículas sinápticas.
Principales resultados:
- La LTP de fibra de musgo fue abolida en ratones que carecían de RIM1alpha.
- Estudios previos mostraron que Rab3A es requerido, pero otros sustratos de proteína quinasa A no lo son.
- RIM1alpha se une a Rab3A y es un sustrato de proteína quinasa A.
Conclusiones:
- RIM1alpha es esencial para la fibra musgo LTP.
- Un mecanismo unitario que involucra a Rab3A y RIM1alpha probablemente media el aumento a largo plazo en la liberación de neurotransmisores durante la LTP.
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