Cited by 361Tryptophan and brain disordersStress Responses and CortisolAdipokines, Inflammation, and Metabolic Diseases

The longitudinal associations of inflammatory biomarkers and depression revisited: systematic review, meta-analysis, and meta-regression

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Mac Giollabhui, Naoise, Ng, Tommy H., Ellman, Lauren M., Alloy, Lauren B.·2021·Molecular Psychiatry

Abstract

The innate immune system is dysregulated in depression; however, less is known about the longitudinal associations of depression and inflammatory biomarkers. We investigated the prospective associations of depression and inflammatory biomarkers [interleukin-6 (IL-6), Tumor Necrosis Factor-Alpha (TNF-α), and C-reactive protein (CRP)] in community samples, both unadjusted and adjusted for covariates. The review, registered with PROSPERO, searched for published and unpublished studies via MEDLINE/PsycINFO/PsycARTICLES/EMBASE/Proquest Dissertation. Standardized Fisher transformations of the correlation/beta coefficients, both unadjusted and adjusted for covariates, were extracted from studies examining the prospective associations of depression and inflammatory biomarkers. Systematic review conducted in January, 2019 included 38 studies representing 58,256 participants, with up to 27 studies included in random-effects meta-analysis. Higher CRP/IL-6 were associated with future depressive symptoms, and higher depressive symptoms were associated with higher future CRP/IL-6 in both unadjusted and adjusted analyses - this is the first meta-analysis reporting an adjusted association of IL-6 with future depression. The adjusted prospective associations of depression with CRP/CRP with depression were substantially attenuated and small in magnitude. No significant associations were observed for TNF-α. No conclusive results were observed in studies of clinical depression. Meta-regression indicated that the association of CRP and future depression was larger in older samples and in studies not controlling for possible infection. Small, prospective associations of depression and inflammatory biomarkers are observed in both directions, particularly for IL-6; however, the strength and importance of this relationship is likely obscured by the heterogeneity in depression and profound study/methodological differences. Implications for future studies are discussed.

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  • Elevated levels of CRP are associated with increased risk for chronic diseases, including cardiovascular disease, cancers, and depression.

    “In particular, elevated levels of CRP are associated with increased risk for chronic diseases, including cardiovascular disease, cancers, and depression.36,37”

    From Social Media Use and Its Link to Physical Health Indicators (2022) · cites this paper as [37]

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  1. [40]Au B, Smith KJ, Gariepy G, Schmitz N. The longitudinal associations between C-reactive protein and depressive symptoms: evidence from the English Longitudinal Study of Ageing (ELSA). Int J Geriatr Psychiatry. 2015; 30(9): 976– 84. 25537199

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Authors
Mac Giollabhui, N., Ng, T. H., Ellman, L. M., & Alloy, L. B.
Affiliations
Temple University (US)
Corresponding author
Alloy, Lauren B.
Venue
Molecular Psychiatry
Published
2020-08-17
Volume
26
Issue
7
Pages
3302-3314
ISSN
  • 1359-4184 (ISSN-L)
  • 1476-5578
OpenAlex
W3049499252
Cited by
361
References
80
Citations by year
2026: 60 · 2025: 88 · 2024: 67 · 2023: 61 · 2022: 50 · 2021: 33 · 2020: 2
FWCI
2.35
Type
journal article
Language
en
Open access
Locations
  • Molecular Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • U.S. Department of Health & Human Services | NIH | National Institute of Mental Health (MH101168, MH079369, F31MH118808, MH118545, MH096478)
  • American Psychological Foundation
Topics
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
depression, inflammatory markers, interleukin-6, TNF-α, C-reactive protein, innate immune system, prospective associations, depressive symptoms, infection, community sample
MeSH terms
Aged, C-Reactive Protein, Depression, Humans, Inflammation, Tumor Necrosis Factor-alpha, Biomarkers, Interleukin-6

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