A hypothalamic circuit that modulates feeding and parenting behaviours.

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.