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[Melatonin and seasonal depression]

B Tarquini1, F Perfetto, R Tarquini

  • 1Istituto di Clinica Medica IV, Università, Firenze.

Recenti Progressi in Medicina
|August 6, 1998
PubMed
Summary

The melatonin hypothesis for seasonal affective disorder (SAD) has mixed evidence, with some support but also disproven claims. New findings suggest latitude and geomagnetic fields may influence melatonin levels and SAD.

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Psychiatry

Context:

  • Seasonal Affective Disorder (SAD) is linked to changes in daylight hours.
  • The melatonin (MEL) hypothesis proposes a connection between MEL secretion and SAD.
  • Previous evidence supporting this hypothesis is being re-evaluated.

Purpose:

  • To review the evidence for and against the melatonin hypothesis in SAD.
  • To explore novel associations between latitude, geomagnetic fields, and melatonin.
  • To understand the complex relationship between photoperiod, melatonin, and SAD.

Summary:

  • The original melatonin hypothesis for SAD is challenged by findings that light acts independently of melatonin and some antidepressants do not alter melatonin levels.
  • However, the relationship between SAD incidence/severity and latitude suggests a potential role for melatonin.
  • Melatonin levels show seasonal variations influenced by sunshine duration, with geomagnetic disturbances potentially affecting melatonin production and function at higher latitudes.

Impact:

  • This research refines our understanding of SAD's etiology, moving beyond a simple melatonin deficiency model.
  • It highlights the potential impact of geophysical factors like latitude and geomagnetic activity on mood disorders.
  • Suggests new avenues for investigating SAD treatments and preventative strategies.

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