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Related Experiment Video

Updated: May 12, 2026

Animal Models of Depression - Chronic Despair Model (CDM)
05:47

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Published on: September 23, 2021

Oscillatory serotonin function in depression.

Ronald M Salomon1, Ronald L Cowan

  • 1Department of Psychiatry, Vanderbilt University School of Medicine, Nashville, Tennessee, 37212.

Synapse (New York, N.Y.)
|April 18, 2013
PubMed
Summary
This summary is machine-generated.

Ultradian rhythms in serotonin (5HT) function are altered in depression. Antidepressant treatments enhanced these rhythms, suggesting 5HT oscillatory dysfunction may be a biomarker for depression.

Keywords:
MDMAchronobiologydepressiondopaminefMRIraphé nucleserotonintryptophan depletion

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Biochemistry

Background:

  • Ultradian rhythms (faster than circadian) in brain activity and mood are crucial for normal behavior.
  • Alterations in these rhythms and central nervous system activity are observed in depression.
  • Emerging evidence suggests changes in ultradian rhythms of serotonin (5HT) function in depression.

Purpose of the Study:

  • To investigate the role of ultradian oscillations in serotonin (5HT) function in mood and behavior.
  • To explore whether 5HT oscillatory dysfunction is a biomarker for depression and predicts treatment response.

Main Methods:

  • Measured 5HT metabolites in cerebrospinal fluid (CSF) every 10 min for 24 h before and after antidepressant treatment.
  • Used resting-state functional magnetic resonance imaging (fMRI) to assess dorsal raphe activation cycles and functional connectivity during tryptophan depletion.
  • Compared fMRI data in MDMA users (with diminished 5HT function) versus non-MDMA users.

Main Results:

  • Antidepressant treatments increased ultradian amplitudes of CSF 5HT metabolite levels.
  • Tryptophan depletion increased dorsal raphe activation cycle amplitudes and weakened functional connectivity.
  • MDMA users exhibited diminished fMRI intra-regional coherence and altered functional connectivity compared to controls.

Conclusions:

  • Ultradian oscillations in 5HT function critically influence moods and behaviors.
  • Dysfunctional 5HT rhythms may represent a common endpoint and biomarker for depression.
  • 5HT oscillatory dysfunction could define illness subtypes and predict response to serotonergic treatments.