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Las entradas de serotonina y neurotensina en el vCA1 dictan la valencia social opuesta
Julia M Zorab1, Huanhuan Li1, Richa Awasthi1
1Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
Nature
|April 30, 2025
Resumen
Las experiencias sociales dan forma a cómo los animales perciben a los demás. Este estudio revela cómo la serotonina y la neurotensina en la región ventral CA1 del hipocampo determinan la valencia social positiva o negativa, crucial para la supervivencia.
Área de la Ciencia:
- La neurociencia
- Conocimiento social
- Biología del comportamiento
Sus antecedentes:
- Evaluar la valencia del agente social es vital para la supervivencia en los grupos sociales.
- Se sabe que los circuitos del hipocampo distinguen lo familiar de lo nuevo.
- Los mecanismos para construir la valencia social a partir de la experiencia y la versatilidad dinámica de las relaciones siguen sin estar claros.
Objetivo del estudio:
- Investigar cómo se construye la valencia social basada en la historia social.
- Elucidar los mecanismos neuronales que subyacen a la valencia social flexible en las relaciones dinámicas.
- Identificar las entradas neuroquímicas específicas en el CA1 ventral que determinan la valencia social.
Principales métodos:
- Se investigó el papel de la serotonina (5-HT) del rafe dorsal y la neurotensina del núcleo paraventricular del tálamo (PVT) en el CA1 ventral (vCA1).
- Se utilizó el silenciamiento optogenético para evaluar el impacto de estos insumos en la valencia social.
- Se examinaron los efectos de los receptores 5-HT1B y NTR1 en la actividad de las neuronas piramidal vCA1 durante las interacciones sociales.
Principales resultados:
- La liberación de serotonina (5-HT) durante las interacciones apetitivas desinhibe las neuronas vCA1 a través de los receptores 5-HT1B.
- La liberación de neurotensina durante las interacciones aversivas potencia las neuronas vCA1 a través de los receptores NTR1.
- El silenciamiento optogenético de estas entradas deterioró la valencia social positiva y negativa, respectivamente; la excitación cambió de forma flexible la asignación de valencia.
Conclusiones:
- La convergencia de las señales de neurotensina dorsal de 5-HT y PVT en el vCA1 vincula las experiencias sociales a la identidad conspecífica.
- Estas señales instruyen la valencia opuesta, lo que demuestra un interruptor sináptico para el cálculo de la valencia social flexible.
- El vCA1 integra las entradas neuroquímicas para determinar dinámicamente la valencia de los agentes sociales.
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