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Related Experiment Videos

Plasma melatonin levels in affective states.

I M McIntyre1, F K Judd, P M Marriott

  • 1Psychoendocrine Research Unit, Department of Psychiatry, University of Melbourne, Heidelberg, Victoria, Australia.

International Journal of Clinical Pharmacology Research
|January 1, 1989
PubMed
Summary

Nocturnal melatonin production is significantly lower in patients with depression and panic disorder. These findings suggest alterations in beta-receptor function and circadian rhythms in affective disorders.

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Area of Science:

  • Neuroendocrinology
  • Psychiatry

Background:

  • Melatonin, a pineal gland hormone, is synthesized from serotonin under noradrenergic stimulation.
  • Nocturnal melatonin levels are thought to reflect beta-adrenergic receptor function and circadian rhythmicity.

Purpose of the Study:

  • To investigate nocturnal melatonin production in patients with depression and panic disorder.
  • To explore the relationship between melatonin levels, beta-receptor function, and circadian rhythm alterations in affective disorders.

Main Methods:

  • Midnight melatonin concentrations were measured in patients with depression and panic disorder and compared to control subjects.
  • Melatonin synthesis phases (20:00–24:00) were analyzed in subsequent investigations.

Main Results:

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  • Depressed patients exhibited significantly lower midnight melatonin levels compared to controls (27.1 ± 5.1 pg/ml vs. 51.6 ± 4.1 pg/ml).
  • Patients with panic disorder also showed significantly lower midnight melatonin levels than controls (28.4 ± 6.4 pg/ml vs. 51.6 ± 4.1 pg/ml).
  • Melatonin rhythm appeared delayed in patients with panic disorder during the initial synthesis phase.

Conclusions:

  • Reduced melatonin synthesis is supported in depressive illness.
  • Findings suggest potential alterations in beta-receptor function and circadian rhythmicity in affective disorders like depression and panic disorder.