Cited by 232Tryptophan and brain disordersStress Responses and CortisolSleep and Wakefulness Research

The inflammatory response system and the availability of plasma tryptophan in patients with primary sleep disorders and major depression

Song, Cai, Lin, Aihua, Bonaccorso, Stefania, Heide, Carine, Verkerk, Robert, Kenis, Gunter, Bosmans, Eugene, Scharpe, Simon +4 more·1998·Journal of Affective Disorders

Abstract

Background It is now well established that major depression is accompanied by an immune-inflammatory system response and that indicators of the latter are inversely correlated with lower availability of plasma tryptophan in depression. Inflammation and infection can alter sleep architecture, whereas sleep disturbances can impair immune functions.Aims and methods The aims of the present study were to examine: (i) immune-inflammatory markers, i.e. serum interleukin-6 (IL-6), IL-8, IL-6 receptor (IL-6R), IL-1R antagonist (IL-1RA), gp130, and prostaglandin E2 (PGE2) production by mitogen-stimulated whole blood and the availability of plasma tryptophan in patients with primary sleep disorders, major depression and healthy volunteers; and (ii) the relationships between the availability of tryptophan and indicators of the immune-inflammatory response system.Results Mitogen-stimulated release of PGE2, and serum IL-6 and IL-8, were significantly increased in both depressed and sleep disordered patients compared to normal controls. Serum IL-1RA was significantly higher in depressed patients than in normal controls. Patients with depression and sleep disorders had a significantly lower availability of tryptophan than normal controls. There were significant and inverse relationships between the availability of plasma tryptophan and serum IL-1RA, IL-6 and IL-8.Conclusions The results suggest that (i) there is an activation of the immune-inflammatory response system in primary sleep disorders and depression; and (ii) the decreased availability of plasma tryptophan may be related to the inflammatory system response.

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Crossref · 10.1016/s0165-0327(98)00025-1

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  • Based on findings of increased proinflammatory cytokines in plasma, decreased anti-inflammatory cytokines, and increased PGE2 in cerebrospinal fluid, depression is considered a sickness behavior.

    “Based on findings that patients with depression exhibit increased levels of proinflammatory cytokines in the plasma[23,24], decreased levels of anti-inflammatory cytokines[28], and increased levels of PGE2 in the cerebrospinal fluid[29], depression is considered a sickness behavior.”

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Authors
Song, C., Lin, A., Bonaccorso, S., Heide, C., Verkerk, R., Kenis, G., Bosmans, E., Scharpe, S., Whelan, A., Cosyns, P., de Jongh, R., & Maes, M.
Affiliations
  • University of Antwerp (BE)
  • St. James's Hospital (IE)
Corresponding author
Maes, Michael
Venue
Journal of Affective Disorders
Publisher
Elsevier BV
Published
1998-06
Volume
49
Issue
3
Pages
211-219
ISSN
0165-0327 (ISSN-L)
OpenAlex
W2000679986
Cited by
232
References
60
Citations by year
2026: 1 · 2025: 6 · 2024: 3 · 2023: 1 · 2022: 7 · 2021: 4 · 2020: 9 · 2019: 8 · 2018: 6 · 2017: 8 · 2016: 7 · 2015: 11 · 2014: 8 · 2013: 9 · 2012: 8
FWCI
3.72
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Affective Disorders (publishedVersion)
  • PubMed (publishedVersion)
Funders
Chinese Academy of Agricultural Sciences
Topics
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
Keywords
major depressive disorder, primary sleep disorders, immune-inflammatory response, interleukin-6, interleukin-8, interleukin-1 receptor antagonist, prostaglandin E2, sleep disorders
MeSH terms
Adult, Depressive Disorder, Female, Humans, Immunity, Cellular, Inflammation, Male, Middle Aged, Mitogens, Sleep Wake Disorders, Tryptophan, Dinoprostone, Cytokines

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