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Related Experiment Videos

Microstructural White Matter Characteristics in Parkinson's Disease With Depression: A Diffusion Tensor Imaging

Colleen Lacey1, Lisa Ohlhauser1, Jodie Reanna Gawryluk1,2,3

  • 1Psychology Department, University of Victoria, Victoria, BC, Canada.

Frontiers in Neurology
|August 29, 2019
PubMed
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This study found no significant differences in white matter integrity between depressed and non-depressed Parkinson's disease patients using diffusion tensor imaging. Further replication is needed to clarify the neuropathology of depression in Parkinson's disease.

Area of Science:

  • Neuroimaging
  • Neurology
  • Psychiatry

Background:

  • Depression is a common symptom in Parkinson's disease (PD), but its neuropathology remains unclear.
  • Previous neuroimaging studies investigating white matter integrity in PD with depression have yielded conflicting results.
  • Replication and further investigation are crucial for understanding the link between PD and depression.

Purpose of the Study:

  • To replicate and extend previous diffusion tensor imaging (DTI) findings comparing white matter integrity in individuals with and without depression and Parkinson's disease.
  • To investigate potential differences in white matter microstructure between depressed PD (dPD) and non-depressed PD (ndPD) groups.
  • To enhance the understanding of neuroimaging results related to depression in early-stage Parkinson's disease.

Main Methods:

Keywords:
Parkinson's diseasedepressiondiffusion tensor imagingreplicationwhite matter

Related Experiment Videos

  • Thirty-seven participants with de novo Parkinson's disease were analyzed from the Parkinson's Progression Marker's Initiative (PPMI) cohort.
  • Participants were categorized into depressed PD (dPD) and non-depressed PD (ndPD) groups based on Geriatric Depression Scale Short Form (GDS-15) scores, with two cutoff thresholds applied.
  • White matter integrity was compared between groups using tract-based spatial statistics (TBSS) on diffusion tensor imaging (DTI) data.

Main Results:

  • No significant differences in white matter microstructure were detected between the dPD and ndPD groups at the whole-brain level or in specific regions of interest.
  • Results remained consistent even when applying a more stringent analysis for group separation.
  • The findings did not replicate previous studies reporting reduced white matter integrity in limbic prefrontal regions in dPD patients.

Conclusions:

  • This study failed to find significant differences in white matter integrity between depressed and non-depressed individuals with early Parkinson's disease.
  • The lack of replication underscores the need for further neuroimaging research and validation in this area.
  • Clarifying the neuropathological underpinnings of depression in Parkinson's disease requires more consistent and reproducible findings.