Cold-induced hyperphagia requires AgRP neuron activation in mice

Area of Science:

• Neurobiology
• Energy Homeostasis
• Metabolism

Background:

• Cold exposure increases energy demands via thermogenesis, requiring compensatory increases in energy intake.
• The neurobiological mechanisms driving cold-induced hyperphagia remain incompletely understood.
• Agouti-related peptide (AgRP) neurons are key regulators of appetite and energy balance.

Purpose of the Study:

• To investigate the role of AgRP neurons in the hyperphagic response to acute cold exposure.
• To determine if AgRP neuron activation is necessary for cold-induced increases in energy intake.

Main Methods:

• Acute cold exposure in animal models.
• Monitoring of AgRP neuron activity.
• Measurement of energy expenditure and energy intake.
• Selective silencing of AgRP neurons to assess functional necessity.

Main Results:

• AgRP neuron activation occurred rapidly upon acute cold exposure.
• Cold exposure increased both energy expenditure and energy intake.
• Silencing AgRP neurons blocked cold-induced hyperphagia but did not affect energy expenditure.

Conclusions:

• The perception of cold is sufficient to activate AgRP neurons and stimulate feeding.
• AgRP neurons play a critical and specific role in mediating the hyperphagic response to cold.
• These findings elucidate a key neural pathway for regulating energy intake in response to environmental temperature.