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Structural brain abnormalities in multiple sclerosis patients with major depression.

A Feinstein1, P Roy, N Lobaugh

  • 1University of Toronto, Toronto, Ontario, Canada. ant.feinstein@utoronto.ca

Neurology
|February 26, 2004
PubMed
Summary
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Major depression in multiple sclerosis (MS) patients is linked to increased brain lesion volume and reduced gray matter. These structural brain changes, particularly in the prefrontal cortex, are key predictors of depression in MS.

Area of Science:

  • Neuroimaging
  • Neurology
  • Psychiatry

Background:

  • Major depression is a common comorbidity in multiple sclerosis (MS).
  • Understanding the neurobiological underpinnings of depression in MS is crucial for effective management.
  • Previous studies suggest a link between brain abnormalities and depression in MS, but specific structural correlates require further investigation.

Purpose of the Study:

  • To investigate the association between major depression and specific structural brain abnormalities in patients with multiple sclerosis (MS).
  • To identify neuroanatomical predictors of depression in an MS cohort.

Main Methods:

  • Two groups of clinically definite MS patients were compared: 21 with major depression and 19 without.
  • Brain magnetic resonance imaging (MRI) was performed on all subjects.

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  • Tissue segmentation and regional brain masking were applied to analyze MRI data for lesion volume, gray matter, and cerebrospinal fluid (CSF) volumes.

    • Main Results:

    • Patients with major depression exhibited greater T2-weighted lesion volume and more extensive T1-weighted lesion volume in the left medial inferior prefrontal cortex compared to euthymic patients.
    • Depressed MS patients also showed reduced gray matter volume and increased CSF volume in the left anterior temporal region.
    • Logistic regression identified left medial inferior prefrontal cortex T2 lesion volume and left anterior temporal CSF volume as independent predictors of depression, accounting for 42% of the variance.

    Conclusions:

    • Structural brain abnormalities, including lesion burden and atrophy, play a significant role in the pathogenesis of depression in MS.
    • While neurobiological factors are important, psychosocial influences should also be considered in the comprehensive understanding and treatment of depression in MS patients.