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Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex

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Clasificación de las sinapsis axonales en la corteza entorrinal medial

Helene Schmidt^1,2, Anjali Gour¹, Jakob Straehle¹

¹Department of Connectomics, Max Planck Institute for Brain Research, D-60438 Frankfurt, Germany.

|September 30, 2017

Resumen

Este resumen es generado por máquina.

Los investigadores descubrieron que los axones de las neuronas excitatorias en el cerebro

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Área de la Ciencia:

La neurociencia
Neurociencia computacional
La neurociencia celular

Sus antecedentes:

La investigación de la conectividad neuronal tradicionalmente se centra en la existencia, la fuerza y la ubicación de las sinapsis.
La organización sináptica de los árboles axonales presinápticos individuales no se caracteriza en gran medida.
Comprender la organización sináptica axonal es crucial para descifrar la función del circuito neuronal.

Objetivo del estudio:

Para investigar la organización sináptica de los axones presinápticos locales en la capa 2 de la corteza entorrinal medial.
Para aclarar el papel de la clasificación de sinapsis axonales en la función del circuito neuronal.
Para analizar el impacto de los circuitos identificados en la actividad neuronal sincronizada.

Principales métodos:

Utilizó reconstrucciones densas de microscopía electrónica tridimensional en modelos de ratas.
Se analizó la organización sináptica de los axones presinápticos locales en la corteza entorrinal medial.
Realización de simulaciones computacionales para evaluar la función del circuito.

Principales resultados:

Se observó una clasificación de sinapsis axonales dependiente de la longitud del camino, con axones excitatorios dirigidos a neuronas inhibidoras y luego excitatorias.
Reveló un circuito de inhibición de alimentación que involucra axones inhibidores amplios y mielinados y sinapsis dendríticas agrupadas.
Las simulaciones demostraron la capacidad del circuito para controlar la propagación de la actividad sincronizada.

Conclusiones:

El estudio descubre un nuevo principio de organización sináptica en las proyecciones axonales.
Identificó un circuito de inhibición de alimentación que regula con precisión la actividad de la red neuronal.
Los hallazgos proporcionan información sobre la arquitectura funcional de la corteza entorrinal medial y su papel en la representación espacial.