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Large-scale Three-dimensional Imaging of Cellular Organization in the Mouse Neocortex
Published on: September 5, 2018
La organización dendrítica de la entrada sensorial a las neuronas corticales en vivo
Hongbo Jia1, Nathalie L Rochefort, Xiaowei Chen
1Institute of Neuroscience and Center for Integrated Protein Science, Technical University Munich, Biedersteinerstrasse 29, 80802 Munich, Germany.
Nature
|April 30, 2010
Resumen
Las neuronas corticales integran entradas sinápticas específicas de orientación a través de sus dendritas. Esta integración espacial permite a las neuronas calcular su orientación preferida del estímulo, aclarando cómo se procesa la información sensorial.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Procesamiento Sensorial Procesamiento Sensorial
- La neurociencia computacional es una neurociencia computacional.
Sus antecedentes:
- Las neuronas en la corteza sensorial exhiben sintonización de características, respondiendo preferentemente a las características de estímulos específicos como la orientación en la corteza visual.
- La naturaleza precisa de las entradas sinápticas que impulsan estas salidas neuronales sintonizadas sigue sin caracterizarse en gran medida.
Objetivo del estudio:
- Desarrollar y aplicar un nuevo método in vivo para visualizar y mapear funcionalmente las entradas sensoriales en las dendritas de las neuronas corticales.
- Investigar la distribución espacial y las propiedades de afinación de las entradas sinápticas específicas de orientación.
Principales métodos:
- Imágenes combinadas de dos fotones de alta velocidad con grabaciones electrofisiológicas in vivo.
- Se identificaron señales de calcio subumbral indicativas de la entrada sináptica.
- Mapeó las propiedades funcionales de estas entradas a través de árboles dendríticos.
Principales resultados:
- Se identificaron señales locales de subumbral de calcio que corresponden a entradas sinápticas específicas de orientación.
- Descubrió que las entradas con la misma preferencia de orientación están ampliamente distribuidas en todo el árbol dendrítico.
- Se observó que las entradas con diferentes preferencias de orientación están intercaladas en segmentos dendríticos adyacentes.
Conclusiones:
- Las neuronas sintonizadas por orientación integran entradas sinápticas distribuidas espacialmente que codifican para múltiples orientaciones de estímulo.
- Este mecanismo de integración permite a las neuronas calcular su selectividad de orientación característica.
- Proporciona un nuevo marco para la comprensión de la integración de la entrada sensorial en la corteza.
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