Cited by 329Tryptophan and brain disordersStress Responses and CortisolTreatment of Major Depression

The psychoneuroimmuno-pathophysiology of cytokine-induced depression in humans

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Wichers, Marieke, Maes, Michael·2002·The International Journal of Neuropsychopharmacology

Abstract

Administration of the cytokines interferon-alpha and interleukin-2 is used for the treatment of various disorders, such as hepatitis C and various forms of cancer. The most serious side-effects are symptoms associated with depression, including fatigue, increased sleepiness, irritability, loss of appetite as well as cognitive changes. However, great differences exist in the prevalence of the development of depressive symptoms across studies. Differences in doses and duration of therapy may be sources of variation as well as individual differences of patients, such as a history of psychiatric illness. In addition, sensitization effects may contribute to differential responses of patients to the administration of cytokines. In animals administration of pro-inflammatory cytokines induces a pattern of behavioural alterations called 'sickness behaviour' which resembles the vegetative symptoms of depression in humans. Changes in serotonin (5-HT) receptors and in levels of 5-HT and its precursor tryptophan in depressed people support a role for 5-HT in the development of depression. In addition, evidence exists for a dysregulation of the noradrenergic system and a hyperactive hypothalamic-pituitary-adrenal (HPA) axis in depression. Some mechanisms exist which make it possible for cytokines to cross the blood-brain barrier. Pro-inflammatory cytokines such as IL-1beta, IFN-alpha, IFN-gamma and TNF-alpha affect the 5-HT metabolism directly and/or indirectly by stimulating the enzyme indoleamine 2,3-dioxygenase which leads to a peripheral depletion of tryptophan. IL-1, IL-2 and TNF-alpha influence noradrenergic activity and IL-1, IL-6 and TNF-alpha are found to be potent stimulators of the HPA axis. Altogether, administration of cytokines may induce alterations in the brain resembling those found in depressed patients, which leads to the hypothesis that cytokines induce depression by their influence on the 5-HT, noradrenergic and HPA system.

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Authors
Wichers, M., & Maes, M.
Affiliations
Maastricht University (NL)
Corresponding author
Maes, Michael
Venue
The International Journal of Neuropsychopharmacology
Published
2002-12
Volume
5
Issue
4
Pages
375-388
ISSN
  • 1461-1457 (ISSN-L)
  • 1469-5111
OpenAlex
W2119526257
Cited by
329
References
10
Citations by year
2026: 3 · 2025: 5 · 2024: 8 · 2023: 8 · 2022: 9 · 2021: 4 · 2020: 5 · 2019: 11 · 2018: 14 · 2017: 11 · 2016: 21 · 2015: 17 · 2014: 16 · 2013: 18 · 2012: 16
FWCI
1.54
Type
journal article
Language
en
Open access
Locations
  • The International Journal of Neuropsychopharmacology (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
interferon-alpha, interleukin-2, inflammatory cytokines, sickness behavior, serotonin, tryptophan depletion, indoleamine 2,3-dioxygenase, noradrenergic system, hypothalamic-pituitary-adrenal axis, blood-brain barrier, depression pathophysiology
MeSH terms
Mental Disorders, Blood-Brain Barrier, Depressive Disorder, Humans, Hypothalamo-Hypophyseal System, Interleukin-2, Norepinephrine, Serotonin, Cytokines, Interferon-alpha

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