Brain structural connectivity in late-life major depressive disorder
Stephen F Smagula1, Howard J Aizenstein1
1Department of Psychiatry, Western Psychiatric Institute and Clinic of University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
Summary
Late-life depression (LLD) is linked to brain structural damage, particularly white matter hyperintensities (WMH). This damage affects brain connectivity, potentially explaining LLD
Area of Science:
- Neuroscience
- Psychiatry
- Radiology
Background:
- Late-life major depressive disorder (LLD) pathogenesis and consequences may stem from disrupted brain connectivity.
- Understanding specific circuit involvement in LLD remains challenging.
- Structural pathology, particularly cerebrovascular disease, plays a significant role in LLD.
Purpose of the Study:
- To review literature on brain connectivity in LLD, focusing on structural pathology.
- To elucidate the relationship between cerebrovascular disease, white matter hyperintensities (WMH), and LLD.
- To explore how structural damage impacts brain function and network properties in LLD.
Main Methods:
- Literature review focusing on brain connectivity and structural pathology in LLD.
- Analysis of studies measuring white matter hyperintensity (WMH) burden.
- Inclusion of findings from diffusion tensor imaging (DTI) and functional MRI (fMRI).
Main Results:
- LLD is associated with increased cerebrovascular disease, measured as white matter hyperintensity (WMH) burden.
- WMHs indicate myelin damage and fluid accumulation, affecting white matter microstructural integrity and brain function.
- LLD also involves reduced white matter integrity and grey matter loss, further altering brain network properties.
Conclusions:
- Structural brain damage, including WMH, reduced white matter integrity, and atrophy, are likely pathophysiological mechanisms of LLD.
- These structural changes may explain LLD's clinical manifestations by affecting brain function and connectivity.
- Further research is needed to understand the developmental course and pathology of these imaging markers in LLD.
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