Cited by 382Stress Responses and CortisolTryptophan and brain disordersTreatment of Major Depression

The DOI matches its Crossref record; 50 of the 50 references it cites were found in a registry or an index; 3 of the 64 sources its claims cite were checked for support.

Why are depressed patients inflamed? A reflection on 20 years of research on depression, glucocorticoid resistance and inflammation

Open access
Pariante, Carmine M.·2017·European Neuropsychopharmacology

Abstract

Studies over the last 20 years have demonstrated that increased inflammation and hyperactivity of the hypothalamic-pituitary-adrenal (HPA) axis are two of the most consistent biological findings in major depression and are often associated: but the molecular and clinical mechanisms underlying these abnormalities are still unclear. These findings are particularly enigmatic, especially considering the accepted notion that high levels of cortisol have an anti-inflammatory action, and therefore the coexistence of inflammation and hypercortisolemia in the same diagnostic group appears counter-intuitive. To celebrate the 2015 Anna-Monika Foundation Award to our laboratory, this review will discuss our own 20 years of research on the clinical and molecular evidence underlying the increased inflammation in depression, especially in the context of a hyperactive HPA axis, and discuss its implications for the pathogenesis and treatment of this disorder.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

This narrative review reflects on 20 years of the author's laboratory research on why a subgroup of depressed patients shows both increased inflammation and HPA-axis abnormalities, proposing glucocorticoid resistance as the linking mechanism. It argues that inflammation in depression is often a "biological scar" of early-life stress and can be used to predict antidepressant non-response.

Key findings

  • Increased inflammation and HPA-axis hyperactivity coexist in depression despite cortisol's expected anti-inflammatory action; the author's in vitro work showed IL-1 induces glucocorticoid resistance (impaired GR translocation), while antidepressants reverse it.
  • In the GENDEP sample, depressed patients showed increased mRNA of pro-inflammatory cytokines (IL-1, IL-6, TNF-alpha, MIF) and reduced IL-4, together with reduced GR mRNA and increased FKBP5 — a molecular signature of GR resistance.
  • In depressed patients with coronary heart disease, higher IL-6 mRNA and CRP and reduced GR mRNA were found, but associated with HPA-axis hypoactivity rather than hyperactivity.
  • Baseline mRNA levels of IL-1, MIF and TNF-alpha predicted roughly half the variance in antidepressant response; in a replication using absolute mRNA values, cut-offs predicted non-response with positive predictive values and specificity of 100%.
  • Early-life adversity (childhood maltreatment, and prenatal maternal depression in the South London Child Development Cohort) was associated with raised inflammation markers (CRP, white cell counts, fibrinogen); a randomized controlled trial found prophylactic EPA/DHA prevented or delayed interferon-alpha-induced depression.

Methods

  • Design: narrative, self-referential review of the author's own 20 years of research (1991–2017), framed around the 2015 Anna-Monika Foundation Award.
  • Evidence base: in vitro models (mouse fibroblasts, human peripheral blood mononuclear cells, human neurons/hippocampal progenitor cells), animal studies, and clinical cohorts including GENDEP, the Dunedin study, and the South London Child Development Cohort, plus an RCT of omega-3 fatty acids.
  • Analysis: descriptive synthesis of findings across these studies; no systematic search or meta-analysis is described.

Limitations

  • Stated: the review is explicitly self-referential ("the narrative and the citations are self-referential"), and the author lists outstanding unanswered questions, including the epigenetic mechanisms linking early-life events to long-term inflammation, how anti-inflammatories help depression, and whether normalising GR function is helpful for patients.
  • Evident from the text: as a single-laboratory narrative review it is not a systematic or exhaustive synthesis, and several cited findings (e.g., the 100% predictive values, preliminary genetic and in utero evidence) are described by the author as preliminary or requiring replication.

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Integrity signals

Registry

Crossref · 10.1016/j.euroneuro.2017.04.001

Cites

50 of 50 references verified0 citation errors · 0 not checkable

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Claims the paper makes

41 Not checked yet · 6 Own interpretation · 2 Supported · 1 Partly supported · accuracy not yet measured

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  • It may state two separate claims as one. 19
  • Probably not a substantial claim. 1
20 of 20
  • The paper relies on this without support.

    The molecular and clinical mechanisms underlying the association between increased inflammation and HPA axis hyperactivity in major depression are still unclear.

    “the molecular and clinical mechanisms underlying these abnormalities are still unclear.”
  • The paper relies on this without support.

    Not all depressed patients have increased inflammation.

    “Not all depressed patients have increased inflammation: so, who are these patients that present with this biological phenotype?”
2 of 2

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Metadata

Authors
Pariante, C. M.
Affiliations
King's College London (GB)
Corresponding author
Pariante, Carmine M.
Venue
European Neuropsychopharmacology
Publisher
Elsevier BV
Published
2017-06
Volume
27
Issue
6
Pages
554-559
ISSN
0924-977X (ISSN-L)
OpenAlex
W2611710834
Cited by
382
References
50
Citations by year
2026: 29 · 2025: 31 · 2024: 56 · 2023: 32 · 2022: 40 · 2021: 44 · 2020: 59 · 2019: 43 · 2018: 39 · 2017: 9
FWCI
3.63
Type
journal article
Language
en
Open access
Locations
  • European Neuropsychopharmacology (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Research Portal (King's College London) (publishedVersion, cc-by-nc-nd)
Funders
  • mmunopsychiatry (MR/L014815/1)
  • Medical Research Council (MR/J002739/1)
  • National Institute for Health Research Mental Health Biomedical Research Centre
  • Maudsley NHS Foundation Trust
  • King׳s College London
  • Wellcome Trust Consortium
  • NARSAD
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Health Sciences › Medicine › Pharmacology (medical) › Treatment of Major Depression
Keywords
major depressive disorder, inflammation, glucocorticoid resistance, hypothalamic-pituitary-adrenal axis, hypercortisolism, cortisol, depression pathogenesis, depression treatment
MeSH terms
Anti-Inflammatory Agents, Depression, Glucocorticoids, Humans, Hydrocortisone, Hypothalamo-Hypophyseal System, Inflammation, Metabolism, Inborn Errors, Pituitary-Adrenal System, Receptors, Glucocorticoid, Time Factors, Inflammation Mediators, Biomedical Research

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