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J Psychiatr Res. 2015 May;64:9-18. doi: 10.1016/j.jpsychires.2015.02.025. Epub 2015 Mar 6.

Reduced default mode network suppression during a working memory task in remitted major depression.

Author information

1
Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria.
2
Department of Psychology, Dresden University of Technology, Dresden, Germany.
3
MR Centre of Excellence, Medical University of Vienna, Vienna, Austria; Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria.
4
Department of Child and Adolescent Psychiatry, Medical University of Vienna, Vienna, Austria.
5
Center of Physiology and Pharmacology, Institute of Pharmacology, Medical University of Vienna, Vienna, Austria.
6
Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria. Electronic address: lukas.pezawas@meduniwien.ac.at.

Abstract

Insufficient default mode network (DMN) suppression was linked to increased rumination in symptomatic Major Depressive Disorder (MDD). Since rumination is known to predict relapse and a more severe course of MDD, we hypothesized that similar DMN alterations might also exist during full remission of MDD (rMDD), a condition known to be associated with increased relapse rates specifically in patients with adolescent onset. Within a cross-sectional functional magnetic resonance imaging study activation and functional connectivity (FC) were investigated in 120 adults comprising 78 drug-free rMDD patients with adolescent- (n = 42) and adult-onset (n = 36) as well as 42 healthy controls (HC), while performing the n-back task. Compared to HC, rMDD patients showed diminished DMN deactivation with strongest differences in the anterior-medial prefrontal cortex (amPFC), which was further linked to increased rumination response style. On a brain systems level, rMDD patients showed an increased FC between the amPFC and the dorsolateral prefrontal cortex, which constitutes a key region of the antagonistic working-memory network. Both whole-brain analyses revealed significant differences between adolescent-onset rMDD patients and HC, while adult-onset rMDD patients showed no significant effects. Results of this study demonstrate that reduced DMN suppression exists even after full recovery of depressive symptoms, which appears to be specifically pronounced in adolescent-onset MDD patients. Our results encourage the investigation of DMN suppression as a putative predictor of relapse in clinical trials, which might eventually lead to important implications for antidepressant maintenance treatment.

KEYWORDS:

Default mode network; Functional magnetic resonance imaging; Major depressive disorder; Remission; Rumination; Working memory

PMID:
25801734
PMCID:
PMC4415908
DOI:
10.1016/j.jpsychires.2015.02.025
[Indexed for MEDLINE]
Free PMC Article

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