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Thyroid axis activity and serotonin function in major depressive episode.

F Duval1, M C Mokrani, P Bailey

  • 1Centre Hospitalier, Rouffach, France.

Psychoneuroendocrinology
|August 19, 1999
PubMed
Summary
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Major depression involves altered hypothalamic-pituitary-thyroid (HPT) axis and serotonin (5-HT) function. In depressed patients, HPT axis abnormalities may compensate for reduced central 5-HT activity, suggesting other mechanisms in TSH blunting.

Area of Science:

  • Neuroendocrinology
  • Psychiatry
  • Molecular Biology

Background:

  • Major depressive disorder (MDD) is associated with dysregulation of the hypothalamic-pituitary-thyroid (HPT) axis and serotonin (5-HT) neurotransmission.
  • The precise functional relationship between HPT axis activity and 5-HT system function in MDD remains incompletely understood.

Purpose of the Study:

  • To investigate the interrelationship between HPT axis function and 5-HT system activity in drug-free patients with major depressive episode.
  • To examine hormonal responses to thyrotropin-releasing hormone (TRH) and D-fenfluramine (D-FEN) in depressed patients and healthy controls.

Main Methods:

  • Assessed thyrotropin (TSH) response to TRH challenges (0800 and 2300 h) and adrenocorticotropic hormone (ACTH), cortisol, and prolactin (PRL) responses to D-FEN in 60 MDD patients and 20 controls.

Related Experiment Videos

  • Analyzed basal and stimulated hormone levels, including delta TSH and delta delta TSH, and D-FEN-induced hormonal changes (delta ACTH, delta cortisol, delta PRL).

    • Main Results:

    • Depressed patients exhibited blunted TSH responses (lower basal 2300 h TSH, delta TSH, delta delta TSH) compared to controls.
    • While basal and D-FEN-stimulated ACTH, cortisol, and PRL did not differ between groups, hormonal responses to D-FEN were interrelated.
    • Patients with HPT axis abnormalities (reduced delta delta TSH) showed D-FEN responses similar to controls; however, those without HPT abnormality had diminished D-FEN responses.

    Conclusions:

    • TSH blunting in MDD may involve mechanisms beyond 5-HT dysregulation.
    • Reduced central 5-HT function is evident in some depressed patients, particularly those without HPT axis abnormalities.
    • HPT axis dysregulation might serve as a compensatory mechanism for diminished central 5-HT activity in major depression.