AgRP neurons control compulsive exercise and survival in an activity-based anorexia model

Area of Science:

• Neuroscience
• Behavioral Biology
• Metabolic Regulation

Background:

• Hypothalamic Agouti-related peptide (AgRP) neurons control feeding and complex behaviors.
• The role of AgRP neurons in conditions like anorexia nervosa is not fully understood.

Purpose of the Study:

• To investigate the role of AgRP neurons in anorexia nervosa symptomatology using a mouse model.
• To explore the connection between AgRP neurons, compulsive exercise, and metabolic regulation.

Main Methods:

• In vivo fiber photometry to monitor AgRP neuronal activity.
• AgRP neuron ablation and chemogenetic activation in mice.
• Dietary interventions (high-fat diet) and behavioral analysis of exercise.

Main Results:

• Voluntary cessation of running rapidly inhibited AgRP neuronal activity.
• AgRP neuron-ablated mice undergoing food restriction and running died within 72 hours.
• Activation of AgRP neurons increased running in food-restricted mice without lethality.
• High-fat diets prevented death and long-term behavioral impacts in food-restricted, exercising mice.

Conclusions:

• AgRP neurons play a critical role in regulating compulsive exercise and associated lethality.
• Dietary fat content can mitigate the lethal effects of exercise in food-restricted states.
• Findings suggest a potential link between AgRP neuron function and anorexia nervosa.