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Related Experiment Videos

Galanin: a significant role in depression?

J M Weiss1, R W Bonsall, M K Demetrikopoulos

  • 1Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, Atlanta, Georgia 30306, USA. jweis01@emory.edu

Annals of the New York Academy of Sciences
|February 3, 1999
PubMed
Summary

Increased locus coeruleus (LC) activity may cause depression symptoms by releasing galanin (GAL) in the ventral tegmentum (VTA). This galanin inhibits dopamine, reducing motor activity and pleasure. GAL antagonists could treat depression.

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Area of Science:

  • Neuroscience
  • Neurobiology of Depression

Background:

  • Noradrenergic system dysfunction is implicated in depression.
  • The locus coeruleus (LC) is the primary source of norepinephrine (NE) in the brain.

Purpose of the Study:

  • To propose a hypothesis linking noradrenergic system changes to depression symptoms.
  • To explain how galanin (GAL) release in the ventral tegmentum (VTA) may mediate depression-related behaviors.

Main Methods:

  • Hypothesis formulation based on an animal model of depression.
  • Review of recent data consistent with the proposed mechanism.

Main Results:

  • Increased LC neuron activity releases GAL colocalized with NE in the VTA.
  • GAL in the VTA inhibits VTA dopaminergic neurons projecting to the forebrain.

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Conclusions:

  • This inhibition of dopaminergic pathways may cause anhedonia and decreased motor activation in depression.
  • Galanin antagonists represent a potential therapeutic strategy for depression treatment.