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Cannabinoids drive feeding through AgRP neurons.

Yavuz Yavuz1, Habibe Goren2, Bayram Yilmaz3

  • 1Department of Physiology, Faculty of Medicine, Yeditepe University, Istanbul, Turkiye; Department of Neuroscience and Pharmacology, University of Iowa, Iowa City, IA, USA.

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Cannabinoid type-1 receptors (CB1Rs) influence feeding. Activating CB1Rs reduces signals to Agouti-related peptide (AgRP) neurons, impacting food intake and anxiety. AgRP neurons are crucial for these CB1R effects.

Keywords:
AgRP neuronsAnxietyCB1 receptorElectrophysiologyEndocannabinoid systemFood intakeOptogenetics

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Metabolism

Background:

  • The endocannabinoid system, via cannabinoid type-1 receptors (CB1Rs), regulates energy balance and feeding behavior.
  • CB1R activation typically increases food intake, but the precise role of agouti-related peptide (AgRP) neurons in the arcuate nucleus (ARC) is not fully understood.

Purpose of the Study:

  • To investigate the role of AgRP neurons in mediating the effects of CB1R activation on feeding behavior and anxiety.
  • To elucidate the direct synaptic effects of CB1R modulation on AgRP neurons.

Main Methods:

  • Slice electrophysiology was used to record inhibitory postsynaptic currents (sIPSCs) in AgRP neurons.
  • AgRP neurons were ablated in mice to assess the necessity of these neurons for CB1R agonist effects.
  • CB1R antagonism was administered in AgRP-ablated mice to explore compensatory mechanisms.

Main Results:

  • The CB1R agonist ACEA reduced sIPSCs in AgRP neurons, indicating decreased neuronal inhibition.
  • Ablation of AgRP neurons abolished the hyperphagic (increased food intake) and anxiolytic (reduced anxiety) effects of ACEA.
  • In AgRP-ablated mice, CB1R antagonism led to increased food intake, suggesting compensatory pathways.

Conclusions:

  • Cannabinoid action at synapses on AgRP neurons contributes to the feeding regulatory effects of the endocannabinoid system.
  • Intact AgRP neuron circuits are essential for mediating the hyperphagic and anxiolytic actions of CB1R agonists.
  • Compensatory mechanisms are activated following CB1R antagonism in the absence of AgRP neurons.