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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Macromolecular white matter abnormalities in geriatric depression: a magnetization transfer imaging study
Faith M Gunning-Dixon1, Matthew J Hoptman, Kelvin O Lim
1Institute of Geriatric Psychiatry and the Department of Psychiatry, Weill Medical College of Cornell University, White Plains, NY, USA. fgd2002@med.cornell.edu
Summary
Late-life depression is linked to reduced myelin integrity in brain networks. This study found lower magnetization transfer ratio (MTR) in key white matter regions of older adults with depression.
Area of Science:
- Neuroscience
- Geriatric Psychiatry
- Neuroimaging
Background:
- Geriatric depression is complex and heterogeneous, potentially linked to brain network vulnerabilities.
- Subtle white matter abnormalities may play a role in late-life depression.
Purpose of the Study:
- To identify subtle white matter abnormalities in older adults with major depression.
- To investigate the hypothesis of white matter abnormalities in frontostriatal and limbic regions using MTR imaging.
Main Methods:
- Magnetization Transfer Ratio (MTR) imaging was used to assess myelin integrity.
- Voxel-based analysis of MTR data was performed on 55 older patients with major depression and 24 elderly comparison subjects.
- Age was used as a covariate in a general linear model.
Main Results:
- Patients with late-life depression showed significantly lower MTR in multiple left hemisphere frontostriatal and limbic white matter regions.
- Affected areas included prefrontal, cingulate, insular, and posterior cingulate regions, as well as the thalamus and corpus callosum.
- Findings indicate reduced myelin integrity in specific white matter tracts.
Conclusions:
- Geriatric depression may be characterized by reduced myelin integrity in frontostriatal and limbic networks.
- These results complement diffusion tensor imaging studies showing altered white matter organization in geriatric depression.
- The findings highlight the importance of white matter integrity in the pathophysiology of late-life depression.
