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Un circuito neuronal para la supresión del dolor por un estado de necesidad competitivo
Amber L Alhadeff1, Zhenwei Su1, Elen Hernandez1
1Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA.
Cell
|March 24, 2018
Resumen
El hambre reduce el impacto del dolor inflamatorio al activar circuitos cerebrales específicos. Esta investigación identifica una vía neuronal que involucra a las neuronas AgRP y la señalización del neuropéptido Y en el núcleo parabraquial para la supresión del dolor.
Área de la Ciencia:
- La neurociencia
- Investigación del dolor
- Señales metabólicas
Sus antecedentes:
- La supervivencia depende de equilibrar las necesidades como el hambre y el dolor.
- Los mecanismos neuronales para priorizar estas señales de supervivencia no se comprenden bien.
Objetivo del estudio:
- Investigar cómo el hambre influye en la percepción y respuesta al dolor inflamatorio.
- Identificar los circuitos neuronales y las vías moleculares involucradas en esta interacción.
Principales métodos:
- Se utilizaron modelos de roedores para estudiar las respuestas conductuales al dolor inflamatorio en diferentes estados de hambre.
- Investigó el papel de las neuronas que expresan la proteína agouti-relacionada (AgRP) y sus proyecciones.
- Se examinó la participación de la señalización del neuropéptido Y (NPY) en el núcleo parabraquial (PBN).
Principales resultados:
- El hambre atenúa las respuestas conductuales y afectivas al dolor inflamatorio, sin afectar la nocicepción aguda.
- La activación de las neuronas AgRP controla centralmente este efecto anti-nociceptivo.
- Las proyecciones de AgRP al núcleo parabraquial (PBN) son críticas, ya que la estimulación de las neuronas AgRP → PBN imita el alivio del dolor inducido por el hambre.
- La señalización del neuropéptido Y (NPY), específicamente a través del receptor NPY Y1 en el PBN, media los efectos anti-nociceptivos del hambre.
Conclusiones:
- Un circuito neuronal específico que involucra a las neuronas AgRP y sus proyecciones a la PBN media la priorización del hambre sobre el dolor inflamatorio.
- La señalización del receptor NPY Y1 en el PBN representa un objetivo terapéutico potencial para suprimir el dolor.
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