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Cytokine production and treatment response in major depressive disorder

S Lanquillon1, J C Krieg, U Bening-Abu-Shach

  • 1Department of Psychiatry and Psychotherapy, Philipps-University of Marburg, Marburg, Germany.

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
|March 4, 2000
PubMed

Insights

Major depressive disorder (MDD) patients showed distinct cytokine profiles before treatment. Interleukin-6 (IL-6) levels at admission may predict treatment response to amitriptyline.

Area of Science:

  • Immunology
  • Psychiatry
  • Clinical Medicine

Background:

  • Major depressive disorder (MDD) is associated with altered immune system function.
  • Cytokines like interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-alpha) play roles in inflammation and mood regulation.

Purpose of the Study:

  • To investigate pretreatment and post-treatment levels of IL-6 and TNF-alpha in MDD patients treated with amitriptyline.
  • To determine if cytokine levels correlate with clinical response to antidepressant therapy.

Main Methods:

  • A controlled study assessed whole blood cytokine production (IL-6, TNF-alpha) in 24 MDD inpatients before and after 6 weeks of amitriptyline treatment.
  • Patients were categorized as responders or non-responders based on depression rating scales (Hamilton, Montgomery-Asberg).
  • Immune parameters were compared between patient subgroups and healthy controls.

Main Results:

  • Pre-treatment C-reactive protein (CRP) levels were elevated in both MDD subgroups compared to controls.
  • Unstimulated IL-6 production was decreased in responders and increased in non-responders pre-treatment.
  • Pre-treatment TNF-alpha levels were elevated in both patient groups, decreasing significantly in responders during treatment.
  • IL-6 levels at admission may predict treatment response, while TNF-alpha secretion relates to psychopathological improvement.

Conclusions:

  • Immune dysregulation, particularly involving IL-6 and TNF-alpha, is present in MDD.
  • IL-6 levels before treatment could potentially identify patients likely to respond to amitriptyline.
  • TNF-alpha secretion dynamics correlate with clinical improvement in MDD patients.

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