Cited by 726Tryptophan and brain disordersStress Responses and CortisolTreatment of Major Depression

Inflammation-associated depression: From serotonin to kynurenine

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Dantzer, Robert, O’Connor, Jason C., Lawson, Marcus A., Kelley, Keith W.·2011·Psychoneuroendocrinology

Abstract

In the field of depression, inflammation-associated depression stands up as an exception since its causal factors are obvious and it is easy to mimic in an animal model. In addition, quasi-experimental studies can be carried out in patients who are treated chronically with recombinant cytokines for a medical condition since these patients can be studied longitudinally before, during and after stimulation of the immune system. These clinical studies have revealed that depression is a late phenomenon that develops over a background of early appearing sickness. Incorporation of this feature in animal models of inflammation-associated depression has allowed the demonstration that alterations of brain serotoninergic neurotransmission do not play a major role in the pathogenesis. This is in contrast to the activation of the tryptophan degrading enzyme indoleamine 2,3-dioxygenase that generates potentially neurotoxic kynurenine metabolites such as 3-hydroxy kynurenine and quinolinic acid. Although the relative importance of peripherally versus centrally produced kynurenine and the cellular source of production of this compound remain to be determined, these findings provide new targets for the treatment of inflammation-associated depression that could be extended to other psychiatric conditions mediated by activation of neuroimmune mechanisms.

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Crossref · 10.1016/j.psyneuen.2010.09.012

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  • The reciprocal relationship between stress and depression and anxiety is well established.

    “The reciprocal relationship between stress and depression and anxiety is well established (Dantzer, 2012;Dantzer, O'Connor, Lawson, & Kelley, 2011;Maes, 2008).”

    From The impact of stress on students in secondary school and higher education (2020) · cites this paper as Dantzer, O'Connor, Lawson, & Kelley, 2011

    The Human studies section links psychosocial stress to inflammatory activity and reports a correlation between inflammation and depression-like neural activity during bereavement. It does not establish a reciprocal relationship between stress and depression, or address a reciprocal relationship with anxiety. Page numbers were not available in our copy. (LLM, conf=0.76)

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  • In preclinical models, LPS-induced inflammation increases IDO activity, shifting tryptophan metabolism toward the kynurenine pathway rather than serotonin synthesis.

    “In preclinical models, activation of inflammation using LPS increases the activity of IDO thereby allocating more tryptophan metabolism toward the kynurenine pathway rather than serotonin synthesis (Zunszain et al., 2012), ultimately resulting in serotonin deficiency (See Dantzer et al., 2011; Nikkheslat et al., 2018; O’Farrell and Harkin, 2017 for a review of research on the kynurenine pathway).”
  • These metabolites can interact with neurotransmitter systems in the brain, particularly glutamate, and are thought to be involved in the behavioral effects of cytokines.

    “These metabolites can then interact with neurotransmitter systems in the brain, particularly glutamate (see Section 3.3), and are thought to be involved in the behavioral effects of cytokines (Dantzer et al., 2011, Haroon et al., 2012).”
  • Inflammatory cytokines activate IDO and KYN pathways in the brain that affect glutamate neurotransmission and may contribute to glutamate dysfunction in depression.

    “Inflammatory cytokines activate IDO and KYN pathways in the brain that effect glutamate neurotransmission and may contribute to glutamate dysfunction in depression (McNally et al., 2008, Dantzer et al., 2011, Haroon et al., 2012).”
  • The tryptophan-kynurenine pathway has recently been highlighted in the pathophysiological understanding of MDD beyond the traditional serotonin hypothesis.

    “The tryptophan-kynurenine pathway has recently been highlighted in pathophysiological understanding of MDD beyond the traditional”

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Research works printed but not linked: 8

  1. Benkelfat C Ellenbogen MA Dean P Palmour RM Young SN Mood-lowering effect of tryptophan depletion. Enhanced susceptibility in young men at genetic risk for major affective disorders Arch Gen Psychiatry 1994 51 687 697 8080345
  2. Benkelfat C Ellenbogen MA Dean P Palmour RM Young SN Mood-lowering effect of tryptophan depletion. Enhanced susceptibility in young men at genetic risk for major affective disorders Arch Gen Psychiatry 1994 51 687 697 8080345
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  4. Dunn AJ Wang J Ando T Effects of cytokines on cerebral neurotransmission. Comparison with the effects of stress Adv Exp Med Biol 1999 461 117 127 10442171
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Authors
Dantzer, R., O’Connor, J. C., Lawson, M. A., & Kelley, K. W.
Affiliations
  • University of Illinois Urbana-Champaign (US)
  • The University of Texas at San Antonio Health Science Center (US)
Corresponding author
Dantzer, Robert
Venue
Psychoneuroendocrinology
Publisher
Elsevier BV
Published
2011-04
Volume
36
Issue
3
Pages
426-436
ISSN
0306-4530 (ISSN-L)
OpenAlex
W1978830885
Cited by
726
References
91
Citations by year
2026: 34 · 2025: 25 · 2024: 33 · 2023: 31 · 2022: 52 · 2021: 51 · 2020: 56 · 2019: 55 · 2018: 70 · 2017: 45 · 2016: 57 · 2015: 68 · 2014: 44 · 2013: 45 · 2012: 36
FWCI
2.35
Type
journal article
Language
en
Open access
Locations
  • Psychoneuroendocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute on Aging (AG029573, R01AG029573)
  • National Institute of Mental Health (MH-079829, R01MH079829, MH 71349, R01MH071349, R01MH051569, MH51569)
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
kynurenine pathway, serotonin, indoleamine 2,3-dioxygenase, tryptophan metabolism, 3-hydroxykynurenine, quinolinic acid, neuroinflammation, cytokine therapy, animal models of depression, neuroimmune mechanisms, depression pathogenesis
MeSH terms
Animals, Depression, Disease Models, Animal, Humans, Inflammation, Kynurenine, Models, Biological, Serotonin, Signal Transduction, Cytokines

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