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CaMKII regula la función de respuesta de frecuencia de las sinapsis del hipocampo para la producción tanto de LTD

M Mayford¹, J Wang, E R Kandel

¹Howard Hughes Medical Institute, College of Physicians and Surgeons of Columbia University, New York, New York 10032, USA.

|June 16, 1995

Resumen

CaMKII autofosforilado (calcio-calmodulina dependiente de la proteína quinasa II) regula la plasticidad sináptica. Este estudio muestra que la actividad CaMKII independiente de Ca2+ desplaza la plasticidad sináptica hacia la depresión a largo plazo (LTD) en frecuencias más bajas.

Área de la Ciencia:

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

Sus antecedentes:

La plasticidad sináptica, la capacidad de las sinapsis para fortalecerse o debilitarse con el tiempo, es crucial para el aprendizaje y la memoria.
La proteína quinasa II dependiente de calcio-calmodulina (CaMKII) es una enzima clave involucrada en la plasticidad sináptica, particularmente en la inducción de potenciación a largo plazo (LTP).
Se cree que la forma autophosphorylated, Ca2 +-independiente de CaMKII juega un papel crítico en el mantenimiento de los cambios sinápticos.

Objetivo del estudio:

Investigar el papel específico de la forma autofosforilada, independiente de Ca2+ de CaMKII en la plasticidad sináptica.
Determinar cómo esta actividad de la cinasa modificada influye en la naturaleza dependiente de la frecuencia de los cambios sinápticos, como la LTP y la depresión a largo plazo (LTD).

Principales métodos:

Generación de ratones transgénicos que expresan una forma mutante independiente de Ca2+ de CaMKII (Thr-286 al aspartato), imitando la autofosforilación.
Grabaciones electrofisiológicas en rebanadas del hipocampo para evaluar la inducción de LTP y LTD a varias frecuencias de estimulación.
Análisis de los fenómenos de plasticidad sináptica en ratones transgénicos en comparación con los controles de tipo salvaje.

Principales resultados:

Los ratones transgénicos exhibieron LTP normal en la estimulación de alta frecuencia (100 Hz).
A frecuencias más bajas (1-10 Hz), los ratones transgénicos mostraron un cambio significativo hacia LTD, lo que indica una regulación alterada de la plasticidad sináptica.
La actividad CaMKII independiente de Ca2+ en animales transgénicos explicó fenómenos previamente observados como la disminución dependiente de la edad en LTD y la depresión sináptica mejorada en sinapsis facilitadas.

Conclusiones:

La actividad CaMKII independiente de Ca2+ juega un papel crítico en la regulación del equilibrio dependiente de la frecuencia entre LTP y LTD.
Esta actividad de la quinasa influye en la trayectoria de desarrollo de la plasticidad sináptica y el comportamiento de las sinapsis facilitadas.
Los hallazgos proporcionan un mecanismo molecular para comprender fenómenos complejos de plasticidad sináptica.

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