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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
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Updated: Sep 13, 2025

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Un circuito hipotalámico que modula los comportamientos de alimentación y crianza

Ivan C Alcantara1,2, Chia Li1, Claire Gao1

  • 1Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA.

Nature
|July 31, 2025
PubMed
Resumen

Las nuevas madres equilibran las necesidades de crianza y alimentación a través de los circuitos hipotalámicos. El hambre activa neuronas específicas, cambiando el enfoque de la atención materna a los comportamientos de búsqueda de alimentos.

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Área de la Ciencia:

  • La neurociencia
  • Biología del comportamiento
  • Endocrinología

Sus antecedentes:

  • La lactancia induce cambios de comportamiento significativos en los mamíferos para el cuidado de la descendencia y las demandas de energía.
  • Se conocen los circuitos neuronales para la alimentación y la crianza, pero su interacción durante la lactancia no está clara.

Objetivo del estudio:

  • Investigar cómo los circuitos hipotalámicos se adaptan a la lactancia y al hambre.
  • Identificar los mecanismos neuronales que subyacen a la priorización de las conductas maternas frente a las de alimentación.

Principales métodos:

  • Perfilamiento transcriptómico del núcleo arqueado (ARC) y el área preóptica medial (MPOA) en ratones lactantes y vírgenes.
  • Utilizó un ensayo de conflicto para evaluar la priorización del impulso materno y de alimentación.
  • Se examinó la actividad del péptido relacionado con agouti (AgRP) y las neuronas del receptor de bombesina subtipo 3 (BRS3).

Principales resultados:

  • Los ratones lactantes muestran una mayor actividad de las neuronas ARC AgRP, correlacionada con un mayor apetito.
  • El hambre interrumpe el comportamiento de los padres, aunque las madres lactantes priorizan el cuidado cuando se les priva de alimentos.
  • Las neuronas ARC AgRP inhiben las neuronas MPOA BRS3, un cambio de circuito que promueve la búsqueda de alimentos sobre la crianza de los hijos.

Conclusiones:

  • Las redes hipotalámicas regulan dinámicamente los comportamientos motivados basados en el estado fisiológico.
  • El circuito neuronal ARC AgRP a MPOA BRS3 juega un papel crítico en el equilibrio de la atención materna y el hambre durante la lactancia.