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La dopamina es necesaria para la representación neuronal y el control del vigor del movimiento
Babita Panigrahi1, Kathleen A Martin1, Yi Li1
1Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA.
Cell
|September 12, 2015
Resumen
El agotamiento progresivo de las neuronas de dopamina del cerebro medio disminuye el vigor del movimiento. La dopamina
Área de la Ciencia:
- La neurociencia
- Control del motor
- Enfermedades neurodegenerativas
Sus antecedentes:
- El agotamiento progresivo de las neuronas de dopamina del cerebro medio (PDD) causa déficits de movimiento.
- Los modelos de ganglios basales existentes abordan principalmente los déficits de iniciación, no el vigor del movimiento.
Objetivo del estudio:
- Investigar las representaciones neurales del vigor del movimiento en el estriado dorsal.
- Determinar el papel de la entrada dopaminérgica en la regulación del vigor del movimiento.
- Explorar estrategias terapéuticas para la enfermedad de Parkinson (EP).
Principales métodos:
- Utilizó una tarea de acondicionamiento operante basada en esfuerzo en ratones con la cabeza fija.
- Se examinó la actividad neural en el estriado dorsal.
- Se administró un precursor sintético de la dopamina y se suprimió la actividad estriatal.
Principales resultados:
- Se identificaron distintas poblaciones neuronales en el estriado dorsal que representan el vigor del movimiento.
- Los ratones con PDD mostraron una reducción en el vigor del movimiento y un deterioro de la representación neuronal.
- La restauración dopaminérgica mejoró el vigor y su codificación neuronal; la supresión estriatal redujo el vigor.
Conclusiones:
- La entrada dopaminérgica en el estriado dorsal es crucial para el vigor del movimiento.
- La actividad estriatal media cambios adaptativos en el vigor del movimiento.
- Los resultados sugieren nuevos objetivos terapéuticos para la enfermedad de Parkinson.
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