An mPOA-ARC^AgRP pathway modulates cold-evoked eating behavior

Area of Science:

• Neuroscience
• Physiology
• Behavioral Biology

Background:

• Appetite increases in cold environments as a thermoregulatory mechanism.
• The neural circuits connecting temperature sensing to feeding behavior are not fully understood.

Purpose of the Study:

• To elucidate the neural circuitry underlying cold-evoked feeding.
• To identify specific neuronal populations and pathways involved in behavioral thermoregulation and energy homeostasis.

Main Methods:

• Utilized calcium imaging to monitor neuronal activity in hypothalamic AgRP neurons during cold exposure.
• Investigated synaptic connections between medial preoptic area (mPOA) neurons and ARC AgRP neurons.
• Manipulated neuronal activity in the mPOA-ARC pathway to assess effects on feeding behavior.

Main Results:

• Hypothalamic AgRP neurons show immediate activation upon cold exposure.
• Neurons in the mPOA form excitatory connections with ARC AgRP neurons.
• Inhibiting the mPOA-ARC pathway reduced cold-evoked feeding, while activation increased food intake.

Conclusions:

• Identified a novel neural pathway involving mPOA neurons projecting to ARC AgRP neurons that regulates feeding behavior in response to cold.
• This pathway plays a crucial role in mediating the crosstalk between behavioral thermoregulation and energy homeostasis.