Abnormal white matter microstructures in Parkinson's disease and comorbid depression: A whole-brain diffusion tensor...

Area of Science:

• Neuroscience
• Neurology
• Radiology

Background:

• Depressive symptoms are common in Parkinson's disease (PD).
• The underlying neural mechanisms of depression in PD are not well understood.
• White matter microstructural differences may play a role.

Purpose of the Study:

• To investigate white matter microstructural differences in PD patients with comorbid depression.
• To compare these differences with PD patients without depression and healthy controls (HC).

Main Methods:

• Diffusion Tensor Imaging (DTI) was used to analyze white matter integrity.
• Participants included depressed PD patients (n=30), non-depressed PD patients (n=43), and HC (n=91).
• Key MRI-derived indices included fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD), radial diffusivity (RD), and white matter volume (WMV).

Main Results:

• Depressed PD patients exhibited significantly increased axial diffusivity (AD) in the corpus callosum, right anterior corona radiate, and left cingulum.
• Increased mean diffusivity (MD) was observed in the left cingulum of depressed PD patients.
• These findings suggest impaired white matter integrity in frontal and limbic regions.

Conclusions:

• Frontal and limbic white matter integrity is compromised in PD patients experiencing depression.
• These microstructural alterations may contribute to the mechanisms underlying depression in Parkinson's disease.
• Further research can elucidate the neurobiological pathways involved.