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Memorias de escritura con circuitos de refuerzo direccionables por la luz
Adam Claridge-Chang1, Robert D Roorda, Eleftheria Vrontou
1Department of Physiology, Anatomy and Genetics, University of Oxford, Parks Road, Oxford OX1 3PT, UK.
Cell
|October 20, 2009
Resumen
Los investigadores identificaron neuronas específicas de dopamina en Drosophila que señalan el castigo, crucial para el aprendizaje. Este descubrimiento traza un mapa del circuito neuronal para el refuerzo aversivo y la formación de la memoria.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Comportamiento animal Comportamiento animal.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Las neuronas dopaminérgicas están implicadas en el aprendizaje mediante la señalización de recompensas o castigos esperados.
- El acondicionamiento olfativo en Drosophila se basa en la dopamina que actúa sobre las neuronas del cuerpo del hongo, donde se almacenan los recuerdos.
- Las células específicas que producen dopamina para el acondicionamiento y sus objetivos siguen sin identificarse.
Objetivo del estudio:
- Para identificar el origen celular de las señales de dopamina que impulsan el refuerzo aversivo en Drosophila.
- Para determinar los objetivos postsinápticos precisos de estas neuronas dopaminérgicas dentro del cuerpo del hongo.
- Aclarar los circuitos neuronales subyacentes al aprendizaje asociativo y la formación de la memoria.
Principales métodos:
- El control optogenético de los subconjuntos de neuronas dopaminérgicas genéticamente definidos en el comportamiento de Drosophila.
- Ensayos conductuales para evaluar la formación de la memoria y los cambios de comportamiento.
- Rastreo anatómico para identificar objetivos de proyección de neuronas dopaminérgicas identificadas.
Principales resultados:
- El grupo PPL1, compuesto por 12 células dopaminérgicas, fue identificado como la fuente de las señales de refuerzo aversivo.
- Las proyecciones de las neuronas PPL1 se asignaron a regiones específicas dentro de los lóbulos verticales y el talón del cuerpo del hongo.
- La activación artificial de un pequeño número de neuronas PPL1 programó con éxito memorias relacionadas con el comportamiento.
Conclusiones:
- El grupo dopaminérgico PPL1 es esencial para la codificación de señales de refuerzo aversivo en Drosophila.
- Las proyecciones específicas de PPL1 dentro del cuerpo del hongo son objetivos críticos para la formación de la memoria olfativa.
- Este estudio delinea los componentes clave del circuito de refuerzo, avanzando nuestra comprensión de los mecanismos neuronales para la valoración, la asociación y la orientación de la acción.
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