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El antagonismo motor expuesto por la segregación espacial y el momento de la neurogénesis
Marco Tripodi1, Anna E Stepien, Silvia Arber
1Biozentrum, Department of Cell Biology, University of Basel, 4056 Basel, Switzerland.
Nature
|October 21, 2011
Resumen
Los investigadores mapearon los circuitos neuronales que controlan la activación de los músculos antagónicos durante la caminata. Descubrieron la segregación espacial de las interneuronas premotoras, cruciales para el control motor y la coordinación muscular.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- El control del motor es el control del motor.
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- Caminar se basa en la activación coordinada de los grupos musculares antagónicos (extensores y flexores).
- Los circuitos neuronales precisos que gobiernan estas activaciones musculares antagónicas no se comprenden completamente.
Objetivo del estudio:
- Para dilucidar los sustratos anatómicos premotores que controlan la activación del músculo extensor-flexor durante la locomoción.
- Investigar los mecanismos de desarrollo subyacentes a la segregación de estos circuitos neuronales.
Principales métodos:
- Utilizó virus trans-sinápticos monosinápticamente restringidos para el trazado preciso de circuitos en ratones.
- Se analizó la organización espacial y los orígenes del desarrollo de las interneuronas premotoras.
- Investigó el papel de la retroalimentación sensorial propioceptiva en el desarrollo del circuito.
Principales resultados:
- Se identificó la segregación espacial medio-lateral de las interneuronas premotoras extensoras y flexoras en la médula espinal dorsal.
- Se demostró que estas poblaciones de interneuronas se originan en dominios progenitoras comunes, pero se segregan en función del momento de la neurogénesis.
- La retroalimentación sensorial propioceptiva encontrada se dirige a las poblaciones premotoras del extensor medial y es esencial para desarrollar conectividad específica del extensor.
Conclusiones:
- Estableció una base anatómica distinta para los circuitos antagónicos de control muscular a nivel del interneurón premotor.
- Destacó los roles de la entrada sináptica y el tiempo de desarrollo en el establecimiento de circuitos de control motor para distintas acciones musculares.
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