Cited by 544Tryptophan and brain disordersStress Responses and CortisolTreatment of Major Depression

Depression is an inflammatory disease, but cell-mediated immune activation is the key component of depression

Maes, Michael·2011·Progress in Neuro-Psychopharmacology and Biological Psychiatry

Abstract

The first findings that depression is characterized by cell-mediated immune activation and inflammation were published between 1990-1993 (Maes et al.). Recently, it was reported that--based on meta-analysis results--depression is an inflammatory disorder because the plasma levels of two cytokines are increased, i.e. interleukin-(IL)-6 and tumor necrosis factor-α (TNFα). The same meta-analysis found that plasma IL-2 and interferon-(IFN)γ levels are not altered in depression, suggesting that there is no T cell activation in that illness. The present paper reviews the body of evidence that depression is accompanied by cell-mediated immune activation. The findings include: increased serum levels of the soluble IL-2 receptor (sIL-2R) and the sCD8 molecule; increased numbers and percentages of T cells bearing T cell activation markers, such as CD2+CD25+, CD3+CD25+, and HLA-DR+; increased stimulated production of IFNγ; higher neopterin and sTNFR-1 or sTNFR-2 levels; induction of indoleamine 2,3-dioxygenase (IDO) with lowered levels of plasma tryptophan and increased levels of tryptophan catabolites along the IDO pathway (TRYCATs); and glucocorticoid resistance in immune cells. Interferon-α (IFNα)-based immunotherapy shows that baseline and IFNα-induced activation of T cells, IDO activity and TRYCAT formation are related to the development of IFNα-induced depressive symptoms. Animal models of depression show that a cell-mediated immune response is related to the development of depression-like behavior. Antidepressants and mood stabilizers suppress different aspects of cell-mediated immunity and rather specifically target IFNγ production. This review shows that inflammation and cell-mediated immune activation are key factors in depression.

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Crossref · 10.1016/j.pnpbp.2010.06.014

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Authors
Maes, M.
Affiliations
Piyavate Hospital (TH)
Corresponding author
Maes, Michael
Venue
Progress in Neuro-Psychopharmacology and Biological Psychiatry
Publisher
Elsevier BV
Published
2011-04
Volume
35
Issue
3
Pages
664-675
ISSN
0278-5846 (ISSN-L)
OpenAlex
W1997361683
Cited by
544
References
172
Citations by year
2026: 7 · 2025: 35 · 2024: 19 · 2023: 28 · 2022: 41 · 2021: 21 · 2020: 21 · 2019: 34 · 2018: 41 · 2017: 39 · 2016: 44 · 2015: 56 · 2014: 47 · 2013: 37 · 2012: 46
FWCI
2.46
Type
journal article
Language
en
Open access
closed
Locations
  • Progress in Neuro-Psychopharmacology and Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
Keywords
depression, neuroinflammation, cell-mediated immunity, cytokines, interleukin-6, TNF-α, interferon-gamma, soluble interleukin-2 receptor, soluble CD8, T cell activation, neopterin, soluble TNF receptors, indoleamine 2,3-dioxygenase, tryptophan catabolites, glucocorticoid resistance, antidepressants, mood stabilizers, animal models of depression
MeSH terms
Antidepressive Agents, Mental Disorders, Depression, Female, Humans, Immunity, Cellular, Immunosuppressive Agents, Inflammation, Male, Meta-Analysis as Topic

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