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Updated: Jun 3, 2025

Studying Food Reward and Motivation in Humans
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Ghrelin Recruits the Endocannabinoid System to Modulate Food Reward.

Alexander Edwards1, Stephanie DeSante1, Carl Duncan Spencer1

  • 1Neuroscience Department, Carleton University, Ottawa, Ontario K1S5B6, Canada.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 8, 2025
PubMed
Summary
This summary is machine-generated.

Ghrelin stimulates feeding by activating dopamine cells in the brain

Keywords:
dopamineelectrophysiologyendocannabinoidsfood rewardghrelinoperant responding

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Molecular Biology

Background:

  • Ghrelin, a hormone, stimulates feeding via growth hormone secretagogue receptors (GHSR).
  • Endocannabinoids, through cannabinoid receptor-1 (CB-1R), also promote food-seeking behaviors.
  • The interaction between ghrelin and endocannabinoids in the ventral tegmental area (VTA) to regulate food motivation is unknown.

Purpose of the Study:

  • To investigate the interaction between GHSR and CB-1R signaling in the VTA.
  • To determine if this interaction influences food motivation.

Main Methods:

  • Examined GHSR and CB-1R mRNA expression in VTA cells of male and female rats and mice.
  • Investigated the effects of ghrelin on dopamine cells in the VTA.
  • Assessed the impact of GHSR signaling disruption on endocannabinoid levels and gene expression in the VTA.
  • Utilized pharmacological antagonism of VTA CB-1Rs.
  • Blocked cannabinoid breakdown in the VTA.

Main Results:

  • GHSR and CB-1R are expressed in VTA cells, with GHSR in dopamine cells and CB-1R in non-dopaminergic cells.
  • Ghrelin directly activates VTA dopamine cells.
  • GHSR signaling disruption in male rats alters endocannabinoid-related gene expression and lowers 2-arachidonoylglycerol (2-AG) in the VTA.
  • CB-1R antagonism in the VTA reduces ghrelin's orexigenic and appetitive effects.
  • Blocking cannabinoid breakdown in the VTA enhances ghrelin's effects on food motivation.

Conclusions:

  • Ghrelin stimulates VTA dopamine cells and food motivation.
  • This effect is partly mediated by endocannabinoid signaling through CB-1Rs in the VTA.