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Un centro común para el sueño y el control motor en la sustancia negra

  • 0Division of Neurobiology, Department of Molecular and Cell Biology, Helen Wills Neuroscience Institute, Howard Hughes Medical Institute, University of California, Berkeley, CA 94720, USA.
Clinical Neuroscience (new York, N.y.) +

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25 de enero de 2020

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25 de enero de 2020

Ver abstracta en PubMed

Resumen

Este resumen es generado por máquina.

Las neuronas compartidas en la substantia nigra pars reticulata (SNr) coordinan la excitación cerebral y la actividad motora. La activación de estas neuronas promueve el sueño, mientras que su inhibición lo suprime.

Área De La Ciencia

  • La neurociencia
  • Ciencia del sueño
  • Control del motor

Sus Antecedentes

  • La excitación cerebral y los estados motores están vinculados, pero los mecanismos de coordinación son desconocidos.
  • Comprender estos vínculos es crucial para descifrar los trastornos neurológicos.

Objetivo Del Estudio

  • Investigar el papel de las neuronas de la substantia nigra pars reticulata (SNr) en la coordinación de los estados de sueño-vigilia y los comportamientos motores.
  • Identificar poblaciones neuronales específicas involucradas en las transiciones de estado.

Principales Métodos

  • Análisis del comportamiento en la jaula del ratón para identificar estados de comportamiento distintos (locomotriz, movimiento no locomotor, vigilia silenciosa, sueño).
  • Registros electrofisiológicos y manipulación optogenética de subconjuntos específicos de neuronas GABAérgicas en el SNr.
  • Trazando las proyecciones neuronales para entender la conectividad del circuito.

Principales Resultados

  • Se identificaron cuatro estados de comportamiento distintos con diferentes niveles de excitación y actividad motora.
  • Un subconjunto de neuronas SNr GABAérgicas que expresan ácido glutámico descarboxilasa 2 (GAD2) fueron preferentemente activas durante los estados de baja actividad motora y excitación.
  • La activación / inactivación optogenética de estas neuronas GAD2 + SNr sesgó las transiciones de comportamiento y moduló la propensión al sueño.

Conclusiones

  • Las neuronas compartidas dentro del SNr corregulan los estados cerebrales de sueño-vigilia y los comportamientos motores.
  • Las neuronas GAD2 + SNr GABAérgicas actúan como un nodo crítico que integra la información motora y de excitación para controlar las transiciones de estado conductuales.
  • Estos hallazgos revelan un nuevo mecanismo de circuito para la regulación del estado conductual.

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