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Updated: Sep 25, 2025
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Using Facial Electromyography to Assess Facial Muscle Reactions to Experienced and Observed Affective Touch in Humans
Published on: March 15, 2019
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Las bases moleculares y neuronales de la sensación de tacto agradable
Benlong Liu1, Lina Qiao1, Kun Liu1
1Center for the Study of Itch and Sensory Disorders and Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
Science (New York, N.Y.)
|April 28, 2022
Resumen
Los investigadores identificaron una nueva vía para el tacto agradable, que involucra a PROK2 y PROKR2, que es crucial para la reducción del estrés y el comportamiento social. Este descubrimiento arroja luz sobre cómo el tacto afecta el bienestar emocional.
Área de la Ciencia:
- La neurociencia
- Sistema sensorial somático
Sus antecedentes:
- El tacto agradable ofrece beneficios emocionales y psicológicos, ayudando a reducir el estrés y el aislamiento social.
- Los circuitos neuronales que median los efectos positivos del tacto agradable no se comprenden completamente.
Objetivo del estudio:
- Investigar los mecanismos neuronales que subyacen a la percepción y los aspectos gratificantes del tacto agradable.
- Identificar los actores moleculares clave involucrados en la transmisión de señales de tacto agradables.
Principales métodos:
- Se utilizó una prueba de preferencia por el tacto agradable (PT-CPP) en ratones.
- Se han empleado técnicas de ablación genética para atacar interneuronas espinales específicas (PROKR2) y neuronas sensoriales (PROK2).
- Se evaluaron las respuestas conductuales relacionadas con el tacto, el dolor, la picazón, el estrés y la interacción social.
Principales resultados:
- La deleción genética del PROK2 espinal o el PROK2 sensorial abolió la preferencia por el tacto agradable.
- Estas modificaciones genéticas no afectaron el dolor o el comportamiento de picazón.
- Los ratones mutantes exhibieron déficits significativos en la respuesta al estrés y los comportamientos prosociales.
- Se descubrió que las neuronas PROKR2 responden muy bien a las caricias suaves y codifican el valor de la recompensa.
Conclusiones:
- PROK2 actúa como un neuropéptido que codifica y transmite señales de tacto agradable a las neuronas espinales PROKR2.
- Esta vía es esencial para las propiedades gratificantes y afectivas del toque agradable.
- Los hallazgos sugieren implicaciones para la comprensión de la evitación social y los trastornos mentales relacionados con la privación del tacto.
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