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State-independent brain abnormalities in major depressive disorder (MDD) persist after remission, identified via diffusion tensor imaging. These persistent changes in structural connectivity may explain MDD recurrence.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Imaging

Background:

  • Major Depressive Disorder (MDD) has a high recurrence rate, potentially linked to persistent brain abnormalities even after remission.
  • Identifying state-independent abnormalities is crucial for understanding MDD's long-term course.

Purpose of the Study:

  • To identify state-independent brain abnormalities in Major Depressive Disorder (MDD) using longitudinal diffusion tensor imaging (DTI).
  • To differentiate between state-dependent and state-independent changes in structural connectivity (SC) in MDD patients.

Main Methods:

  • Ninety-nine MDD patients and 118 healthy controls (HCs) underwent baseline DTI scans.
  • Sixty-eight MDD patients had follow-up scans after 6 months of antidepressant treatment, with 59 achieving remission.
  • Whole-brain structural connectivity (SC) differences were analyzed using two-sample and paired t-tests, with FDR correction.

Main Results:

  • At baseline, MDD patients showed decreased SC between the right insula and anterior temporal cortex (ATC), right ATC and posterior temporal cortex (PTC), left ATC and auditory cortex, and increased connectivity between the right posterior cingulate cortex (PCC) and left medial parietal cortex (MPC) compared to HCs.
  • In the remitted MDD subgroup, decreased connectivity between the right insula and ATC, and increased connectivity between the right PCC and left MPC persisted.
  • These persistent changes (right insula-ATC, right PCC-left MPC) are considered state-independent, potentially linked to attention bias and motor retardation.

Conclusions:

  • State-independent abnormalities in structural connectivity, specifically involving the right insula-ATC and right PCC-left MPC pathways, are present in MDD and persist after clinical remission.
  • These persistent abnormalities may contribute to the high recurrence rates of MDD.
  • Other observed SC changes, like those involving the ATC and auditory cortex, appear to be state-dependent.