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A hypothalamic circuit that modulates feeding and parenting behaviours.

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.

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Summary

New mothers balance parenting and feeding needs through hypothalamic circuits. Hunger activates specific neurons, shifting focus from maternal care to food-seeking behaviors.

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Area of Science:

  • Neuroscience
  • Behavioral Biology
  • Endocrinology

Background:

  • Lactation induces significant behavioral changes in mammals for offspring care and energy demands.
  • Neural circuits for feeding and parenting are known, but their interaction during lactation remains unclear.

Purpose of the Study:

  • Investigate how hypothalamic circuits adapt to lactation and hunger.
  • Identify neural mechanisms underlying the prioritization of maternal versus feeding behaviors.

Main Methods:

  • Transcriptomic profiling of the arcuate nucleus (ARC) and medial preoptic area (MPOA) in lactating and virgin mice.
  • Utilized a conflict assay to assess maternal and feeding drive prioritization.
  • Examined the activity of agouti-related peptide (AgRP) and bombesin receptor subtype 3 (BRS3) neurons.

Main Results:

  • Lactating mice show increased ARC AgRP neuron activity, correlating with heightened appetite.
  • Hunger disrupts parenting behaviors, though lactating mothers prioritize care when food-deprived.
  • ARC AgRP neurons inhibit MPOA BRS3 neurons, a circuit shift that promotes food-seeking over parenting.

Conclusions:

  • Hypothalamic networks dynamically regulate competing motivated behaviors based on physiological state.
  • The ARC AgRP to MPOA BRS3 neural circuit plays a critical role in balancing maternal care and hunger during lactation.