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Altered network efficiency in major depressive disorder.

Ming Ye1,2,3, Peng Qing1, Ke Zhang4

  • 1College of Computer and Information Science, Southwest University, Chongqing, 400715, China.

BMC Psychiatry
|December 19, 2016
PubMed
Summary
This summary is machine-generated.

Major depressive disorder (MDD) shows altered brain network efficiency, with increased local efficiency in affective regions and decreased efficiency in cognitive control areas. These findings highlight disrupted functional connectivity in depression.

Keywords:
Cognitive control systemFunctional magnetic resonance imagingMajor depressive disorderNetwork efficiencyNetwork topology

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Computational Psychiatry

Background:

  • Major depressive disorder (MDD) is linked to impaired communication between cognitive control and affective processing systems.
  • Understanding network efficiency alterations in MDD is crucial for elucidating its pathophysiology.
  • This study investigates nodal and edge efficiency in whole-brain functional networks of MDD patients.

Purpose of the Study:

  • To investigate alterations in nodal and edge efficiency within the functional brain networks of individuals with MDD.
  • To identify specific brain regions and connections affected by network efficiency changes in MDD.
  • To validate findings across independent datasets and structural templates.

Main Methods:

  • Analysis of whole-brain functional network topology using network efficiency metrics.
  • Comparison of nodal and edge efficiency between 42 MDD patients and 42 controls, replicated in a separate cohort of 30 MDD patients and 30 controls.
  • Utilized two independent datasets and two different structural templates for robust validation.

Main Results:

  • MDD patients exhibited significantly increased local efficiency but unchanged global efficiency.
  • Nodal efficiency increased in affective regions (amygdala, thalamus, hippocampus) and decreased in cognitive control regions (dorsolateral prefrontal cortex, anterior cingulate cortex).
  • Edge efficiency increased, particularly between the thalamus and limbic regions, and between the hippocampus and amygdala/thalamus. Findings were consistent across datasets.

Conclusions:

  • MDD is associated with disrupted functional connectivity networks, particularly between cognitive control and affective processing systems.
  • These network alterations may underlie the pathological mechanisms of depression.
  • The identified network efficiency changes could serve as potential biomarkers for clinical treatment of depression.