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Inflammation and depressive phenotypes: evidence from medical records from over 12 000 patients and brain morphology.

Abstract：

BACKGROUND:Preclinical and human studies suggest an association between chronic inflammation and the development of depressive behaviors. This is proposed to occur through downstream effects of inflammatory cytokines on neuroplasticity, neurogenesis and neurotransmitter function, although the neural correlates remain poorly understood in humans. METHODS:In Study 1, structural magnetic resonance imaging and serum inflammatory cytokine data were analyzed from 53 psychiatrically healthy female participants. Correlational analyses were conducted between interleukin-6 (IL-6) and volume in a priori regions implicated in the pathophysiology of major depressive disorder (MDD). In Study 2, medical data [including serum inflammatory acute phase reactants (C-reactive protein)] were analyzed for 12 589 participants. Participants were classified as having (n = 2541) v. not having (n = 10 048) probable lifetime MDD using phenotypes derived using machine-learning approaches. Non-parametric analyses compared inflammation between groups, whereas regression analyses probed whether inflammation predicted probable MDD classification while accounting for other variables. RESULTS:In Study 1, significant negative correlations emerged between IL-6 and hippocampal, caudate, putamen and amygdalar volume. In Study 2, the MDD group showed a higher probability of elevated inflammation than the non-MDD group. Moreover, elevated inflammation was a significant predictor of probable MDD classification. CONCLUSIONS:Findings indicate that inflammation is cross-sectionally related to reduced volume in brain regions implicated in MDD phenotypes among a sample of psychiatrically healthy women, and is associated with the presence of probable MDD in a large clinical dataset. Future investigations may identify specific inflammatory markers predicting first MDD onset.

journal_name

Psychol Med

journal_title

Psychological medicine

authors

Ironside M,Admon R,Maddox SA,Mehta M,Douglas S,Olson DP,Pizzagalli DA

doi

10.1017/S0033291719002940

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

2790-2798

issue

eissn

0033-2917

issn

1469-8978

pii

S0033291719002940

journal_volume

pub_type

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Inflammation and depressive phenotypes: evidence from medical records from over 12 000 patients and brain morphology.