Cited by 218Tryptophan and brain disordersTreatment of Major DepressionStress Responses and Cortisol

Elevated C-Reactive Protein in Patients With Depression, Independent of Genetic, Health, and Psychosocial Factors: Results From the UK Biobank

Pitharouli, Maria C., Hagenaars, Saskia P., Glanville, Kylie P., Coleman, Jonathan R.I., Hotopf, Matthew, Lewis, Cathryn M., Pariante, Carmine M.·2021·American Journal of Psychiatry

Abstract

OBJECTIVE: The authors investigated the pathways (genetic, environmental, lifestyle, medical) leading to inflammation in major depressive disorder using C-reactive protein (CRP), genetic, and phenotypic data from the UK Biobank. METHODS: This was a case-control study of 26,894 participants with a lifetime diagnosis of major depressive disorder from the Composite International Diagnostic Interview and 59,001 control subjects who reported no mental disorder and had not reported taking any antidepressant medication. Linear regression models of log CRP level were fitted to regress out the effects of age, sex, body mass index (BMI), and smoking and to test whether the polygenic risk score (PRS) for major depression was associated with log CRP level and whether the association between log CRP level and major depression remained after adjusting for early-life trauma, socioeconomic status, and self-reported health status. RESULTS: CRP levels were significantly higher in patients with depression relative to control subjects (2.4 mg/L compared with 2.1 mg/L, respectively), and more case than control subjects had CRP levels >3 mg/L (21.2% compared with 16.8%, respectively), indicating low-grade inflammation. The PRS for depression was positively and significantly associated with log CRP levels, but this association was no longer significant after adjustment for BMI and smoking. The association between depression and increased log CRP level was substantially reduced, but still remained significant, after adjustment for the aforementioned clinical and sociodemographic factors. CONCLUSIONS: The data indicate that the "genetic" contribution to increased inflammation in depression is due to regulation of eating and smoking habits rather than an "autoimmune" genetic predisposition. Moreover, the association between depression and increased inflammation even after full adjustment indicates either the presence of yet unknown or unmeasured psychosocial and clinical confounding factors or that a core biological association between depression and increased inflammation exists independently from confounders.

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Crossref · 10.1176/appi.ajp.2020.20060947

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  • MDD patients showed more frequently a low-grade inflammation state (CRP >3 mg/L) than control subjects (21.1% compared with 16.8%).

    “Furthermore, MDD patients showed more frequently a low-grade inflammation state (i.e., CRP > 3 mg/L) than control subjects (21.1% compared with 16.8%, respectively) [83].”
  • In 26,894 participants with a lifetime diagnosis of MDD compared with 59,000 healthy control subjects, CRP levels were significantly higher in patients with depression than in the control group (2.4 mg/L compared with 2.1 mg/L, p < 0.001).

    “A study recruiting 26,894 participants with a lifetime diagnosis of MDD, evaluated using the Composite International Diagnostic Interview (CIDI), were compared with 59,000 healthy control subjects regarding CRP levels [83]. CRP levels were significantly higher in patients with depression than in the control group (2.4 mg/L compared with 2.1 mg/L, p < 0.001).”

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Authors
Pitharouli, M. C., Hagenaars, S. P., Glanville, K. P., Coleman, J. R. I., Hotopf, M., Lewis, C. M., & Pariante, C. M.
Affiliations
National Health Service (GB)
Venue
American Journal of Psychiatry
Published
2021-06
Volume
178
Issue
6
Pages
522-529
ISSN
  • 0002-953X (ISSN-L)
  • 1535-7228
OpenAlex
W3161566379
Cited by
218
References
51
Citations by year
2026: 42 · 2025: 34 · 2024: 41 · 2023: 41 · 2022: 36 · 2021: 24
FWCI
11.81
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • Research Portal (King's College London) (submittedVersion)
Funders
Medical Research Council (MR/S015132/1, MR/N015746/1, MC_PC_17228)
Topics
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
major depressive disorder, C-reactive protein, low-grade inflammation, polygenic risk score, genetic predisposition to depression, smoking, body mass index, early trauma, socioeconomic status
MeSH terms
Adverse Childhood Experiences, C-Reactive Protein, Depressive Disorder, Major, Major Depressive Disorder, Female, United Kingdom, Health Status, Humans, Inflammation, Male, Middle Aged, Psychology, Smoking, Social Class, Linear Models, Case-Control Studies, Biological Specimen Banks, Genetic Predisposition to Disease

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