Cited by 446Tryptophan and brain disordersGut microbiota and healthStress Responses and Cortisol

Increased IgA and IgM responses against gut commensals in chronic depression: Further evidence for increased bacterial translocation or leaky gut

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Maes, Michael, Kubera, Marta, Leunis, Jean-Claude, Berk, Michael·2012·Journal of Affective Disorders

Abstract

Background Recently, we discovered that depression is accompanied by increased IgM and IgA responses directed against gram negative gut commensals. The aim of this study was to replicate these findings in a larger study group of depressed patients and to examine the associations between the IgA and IgM responses to gut commensals and staging of depression as well as the fatigue and somatic (F&S) symptoms of depression.Methods We measured serum concentrations of IgM and IgA against the LPS of gram-negative enterobacteria, i.e. Hafnia alvei, Pseudomonas aeruginosa, Morganella morganii, Pseudomonas putida, Citrobacter koseri, and Klebsiella pneumoniae in 112 depressed patients and 28 normal controls. The severity of F&S symptoms was measured using the Fibromyalgia and Chronic Fatigue Syndrome Rating Scale.Results The prevalences and median values of serum IgM and IgA against LPS of these commensals were significantly higher in depressed patients than in controls. The IgM levels directed against the LPS of these commensal bacteria were significantly higher in patients with chronic depression than in those without. The immune responses directed against LPS were not associated with melancholia or recurrent depression. There was a significant correlation between the IgA response directed against LPS and gastro-intestinal symptoms.Discussion The results indicate that increased bacterial translocation with immune responses to the LPS of commensal bacteria may play a role in the pathophysiology of depression, particularly chronic depression. Bacterial translocation may a) occur secondary to systemic inflammation in depression and intensify and perpetuate the primary inflammatory response once the commensals are translocated; or b) be a primary trigger factor associated with the onset of depression in some vulnerable individuals. The findings suggest that "translocated" gut commensal bacteria activate immune cells to elicit IgA and IgM responses and that this phenomenon may play a role in the pathophysiology of (chronic) depression by causing progressive amplifications of immune pathways.

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Crossref · 10.1016/j.jad.2012.02.023

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  • Maes et al. found in 2 different studies that lipopolysaccharide produced by gut bacteria could increase immune responses in depressed patients.

    “For example, Maes et al. [142,143] found in 2 different studies that lipopolysaccharide (LPS) produced by gut bacteria could increase immune responses in depressed patients.”

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Authors
Maes, M., Kubera, M., Leunis, J.-C., & Berk, M.
Affiliations
  • Maj Institute of Pharmacology (PL)
  • Barwon Health (AU)
Corresponding author
Maes, Michael
Venue
Journal of Affective Disorders
Publisher
Elsevier BV
Published
2012-12
Volume
141
Issue
1
Pages
55-62
ISSN
0165-0327 (ISSN-L)
OpenAlex
W2154679373
Cited by
446
References
90
Citations by year
2026: 18 · 2025: 27 · 2024: 28 · 2023: 36 · 2022: 30 · 2021: 50 · 2020: 50 · 2019: 44 · 2018: 35 · 2017: 35 · 2016: 29 · 2015: 23 · 2014: 20 · 2013: 14 · 2012: 6
FWCI
6.17
Type
journal article
Language
en
Open access
Locations
  • Journal of Affective Disorders (publishedVersion)
  • PubMed (publishedVersion)
  • Figshare (submittedVersion, cc-by)
Topics
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
chronic depression, IgA, IgM, gut commensals, bacterial translocation, leaky gut, lipopolysaccharide, gram-negative enterobacteria, gastrointestinal symptoms, systemic inflammation, depression pathophysiology
MeSH terms
Adult, Chronic Disease, Major Depressive Disorder, Depressive Disorder, Major, Enterobacteriaceae, Fatigue, Female, Humans, Immunoglobulin A, Immunoglobulin M, Lipopolysaccharides, Male, Middle Aged, Pseudomonas aeruginosa, Bacterial Translocation, Gastrointestinal Tract

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