In-patient treatment and structural dysconnectivity in major depression - A longitudinal connectome study

Area of Science:

• Neuroscience
• Psychiatry
• Network Science

Background:

• Altered brain structural connectivity is linked to Major Depressive Disorder (MDD) pathophysiology.
• The temporal stability and treatment responsiveness of this connectivity in MDD are not well understood.

Purpose of the Study:

• To investigate longitudinal changes in white matter brain connectome in MDD patients undergoing treatment.
• To explore the relationship between brain connectivity changes and treatment response in MDD.

Main Methods:

• Utilized network science and longitudinal magnetic resonance imaging (MRI) data.
• Compared pre-treatment and six-week follow-up brain connectome data of MDD patients (n=109) with healthy controls (HC; n=43).
• Analyzed various in-patient treatments, including electroconvulsive therapy (ECT).

Main Results:

• A significant group-by-time interaction revealed increased brain connectivity in MDD patients post-treatment compared to HC.
• These connectivity changes were widespread, not specific to any treatment (e.g., ECT), and not observed in HC.
• Increased connectivity strength correlated with a reduction in depression symptoms, suggesting a link to neuroplasticity and treatment efficacy.

Conclusions:

• Brain connectome alterations in MDD exhibit dynamic changes during treatment.
• Observed neuroplastic effects may be a general response to effective MDD treatment.
• Brain connectome changes show potential as a biomarker for treatment response in MDD, highlighting neuroplasticity as a therapeutic target.