Large-scale evidence for an association between low-grade peripheral inflammation and brain structural alterations in major depression in the BiDirect study
Adult
Brain
/ diagnostic imaging
C-Reactive Protein
/ metabolism
Case-Control Studies
Cerebral Cortex
/ diagnostic imaging
Cross-Sectional Studies
Depressive Disorder, Major
/ diagnostic imaging
Female
Gray Matter
/ diagnostic imaging
Humans
Inflammation
/ metabolism
Male
Middle Aged
Organ Size
Prefrontal Cortex
/ diagnostic imaging
Journal
Journal of psychiatry & neuroscience : JPN
ISSN: 1488-2434
Titre abrégé: J Psychiatry Neurosci
Pays: Canada
ID NLM: 9107859
Informations de publication
Date de publication:
01 11 2019
01 11 2019
Historique:
entrez:
16
7
2019
pubmed:
16
7
2019
medline:
23
6
2020
Statut:
ppublish
Résumé
Preliminary research suggests that major depressive disorder (MDD) is associated with structural alterations in the brain; as well as with low-grade peripheral inflammation. However, even though a link between inflammatory processes and altered brain structural integrity has been purported by experimental research, well-powered studies to confirm this hypothesis in patients with MDD have been lacking. We aimed to investigate the potential association between structural brain alterations and low-grade inflammation as interrelated biological correlates of MDD. In this cross-sectional study, 514 patients with MDD and 359 healthy controls underwent structural MRI. We used voxel-based morphometry to study local differences in grey matter volume. We also assessed serum levels of high-sensitivity C-reactive protein (hsCRP) in each participant. Compared with healthy controls (age [mean ± standard deviation] 52.57 ± 7.94 yr; 50% male), patients with MDD (49.14 ± 7.28 yr, 39% male) exhibited significantly increased hsCRP levels (Z = −5.562, p < 0.001) and significantly decreased grey matter volume in the prefrontal cortex and the insula. Prefrontal grey matter volume reductions were significantly associated with higher hsCRP levels in patients with MDD (x = 50, y = 50, z = 8; t1,501 = 5.15; k = 92; pFWE < 0.001). In the MDD sample, the significant negative association between hsCRP and grey matter appeared independent of age, sex, body mass index, current smoking status, antidepressant load, hospitalization and medical comorbidities. This study had a cross-sectional design. The present study highlights the role of reduced grey matter volume and low-grade peripheral inflammation as interrelated biological correlates of MDD. The reported inverse association between peripheral low-grade inflammation and brain structural integrity in patients with MDD translates current knowledge from experimental studies to the bedside.
Sections du résumé
Background
Preliminary research suggests that major depressive disorder (MDD) is associated with structural alterations in the brain; as well as with low-grade peripheral inflammation. However, even though a link between inflammatory processes and altered brain structural integrity has been purported by experimental research, well-powered studies to confirm this hypothesis in patients with MDD have been lacking. We aimed to investigate the potential association between structural brain alterations and low-grade inflammation as interrelated biological correlates of MDD.
Methods
In this cross-sectional study, 514 patients with MDD and 359 healthy controls underwent structural MRI. We used voxel-based morphometry to study local differences in grey matter volume. We also assessed serum levels of high-sensitivity C-reactive protein (hsCRP) in each participant.
Results
Compared with healthy controls (age [mean ± standard deviation] 52.57 ± 7.94 yr; 50% male), patients with MDD (49.14 ± 7.28 yr, 39% male) exhibited significantly increased hsCRP levels (Z = −5.562, p < 0.001) and significantly decreased grey matter volume in the prefrontal cortex and the insula. Prefrontal grey matter volume reductions were significantly associated with higher hsCRP levels in patients with MDD (x = 50, y = 50, z = 8; t1,501 = 5.15; k = 92; pFWE < 0.001). In the MDD sample, the significant negative association between hsCRP and grey matter appeared independent of age, sex, body mass index, current smoking status, antidepressant load, hospitalization and medical comorbidities.
Limitations
This study had a cross-sectional design.
Conclusion
The present study highlights the role of reduced grey matter volume and low-grade peripheral inflammation as interrelated biological correlates of MDD. The reported inverse association between peripheral low-grade inflammation and brain structural integrity in patients with MDD translates current knowledge from experimental studies to the bedside.
Identifiants
pubmed: 31304733
doi: 10.1503/jpn.180208
pmc: PMC6821515
doi:
Substances chimiques
C-Reactive Protein
9007-41-4
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Pagination
423-431Informations de copyright
© 2019 Joule Inc. or its licensors
Déclaration de conflit d'intérêts
B. Baune is member of advisory boards, received funding and/or gave presentations for AstraZeneca, Lundbeck, Janssen, Pfizer, Servier, and Wyeth, outside the submitted work. No other competing interests declared.
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