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Related Experiment Videos

Does neuroimmune dysfunction mediate seasonal mood changes in winter depression?

Raymond W Lam1, Cai Song, Lakshmi N Yatham

  • 1Division of Clinical Neuroscience, Department of Psychiatry, University of British Columbia (UBC), 2255 Wesbrook Mall, Vancouver, BC, Canada V6T 2A1. r.lam@ubc.ca

Medical Hypotheses
|August 25, 2004
PubMed
Summary

Seasonal increases in proinflammatory cytokines may drive winter depression (seasonal affective disorder, SAD). This study investigates the link between melatonin, cytokines, and SAD, suggesting new diagnostic and treatment approaches.

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Area of Science:

  • Neuroimmunology
  • Chronobiology
  • Psychiatry

Background:

  • Seasonal changes in immune function are linked to melatonin duration and photoperiod.
  • Neuroimmune dysfunction is implicated in depressive disorders.
  • The cause of winter depression (seasonal affective disorder, SAD) remains unclear, with photoperiod and neurotransmitter hypotheses.

Purpose of the Study:

  • To propose a novel hypothesis linking SAD, melatonin, photoperiod, and neurotransmitters.
  • To investigate the role of seasonal increases in proinflammatory cytokines in the pathophysiology of winter SAD.

Main Methods:

  • Assessing seasonal differences in proinflammatory cytokines and Th1/Th2 balance in SAD patients versus healthy controls.
  • Correlating neuroimmune function with nocturnal melatonin duration in SAD patients.

Related Experiment Videos

  • Evaluating the effect of light treatment on neuroimmune dysfunction in SAD patients.

    • Main Results:

    • Hypothesized that proinflammatory cytokines increase and Th1/Th2 balance shifts in winter SAD patients compared to summer.
    • Anticipated a correlation between neuroimmune function and melatonin duration in SAD.
    • Predicted that light treatment would ameliorate neuroimmune dysfunction.

    Conclusions:

    • Cytokine assays could aid in SAD diagnosis.
    • Neuroimmune dysfunction may predict treatment response in SAD.
    • New immune-based or anti-inflammatory treatments for SAD may be developed.