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Las reglas de aprendizaje sináptico localmente dinámico en las dendritas de las neuronas piramidales.

Christopher D Harvey1, Karel Svoboda

  • 1Janelia Farm Research Campus, HHMI, Ashburn, Virginia 20147, USA.

Nature
|December 22, 2007
PubMed
Resumen
Este resumen es generado por máquina.

La potenciación a largo plazo (LTP) en sinapsis individuales reduce el umbral de plasticidad en las sinapsis vecinas. Esta plasticidad agrupada en el hipocampo puede apoyar la unión de la memoria en las redes neuronales.

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • La plasticidad sináptica.
  • Investigación de la memoria Investigación de la memoria.

Sus antecedentes:

  • La potenciación a largo plazo (LTP) es crucial para el aprendizaje y la memoria.
  • Mientras que la LTP es típicamente específica de la entrada, los modelos neuronales sugieren interacciones entre sinapsis cercanas.

Objetivo del estudio:

  • Para investigar las interacciones entre la plasticidad en las sinapsis vecinas en las células piramidales del hipocampo del ratón.
  • Para determinar si la LTP en una sinapsis afecta la inducción de LTP en las sinapsis adyacentes.

Principales métodos:

  • Inducción de la LTP específica de entrada mediante el desencadenamiento de glutamato de dos fotones o la estimulación sináptica.
  • Aplicación de estímulos subumbral a las espinas vecinas después de la inducción de LTP.
  • Medición de la potenciación sináptica y el agrandamiento de la columna vertebral.
  • Análisis de intervalos de LTP dependientes del tiempo de picos dentro de vecindarios dendríticos.

Principales resultados:

  • LTP en las sinapsis individuales redujo el umbral de potenciación en las sinapsis vecinas.
  • Los estímulos por debajo del umbral indujeron una TPL robusta y el agrandamiento de la columna vertebral en las espinas vecinas después de la TPL inicial.
  • La inducción de LTP amplió la ventana de tiempo efectiva para la LTP dependiente del tiempo de picos.
  • Este efecto duró aproximadamente 10 minutos y se extendió sobre ~ 10 micrómetros de dendrita.

Conclusiones:

  • Las interacciones locales entre las sinapsis vecinas facilitan la plasticidad agrupada.
  • Este fenómeno apoya los modelos de almacenamiento de memoria que implican cambios sinápticos coordinados.
  • La plasticidad agrupada podría permitir la unión de información conductalmente relevante dentro de una rama dendrítica.