Dendrite complexity of the posterior cingulate cortex as a substrate for recovery from post-stroke depression: A...

Area of Science:

• Neuroscience
• Neurology
• Radiology

Background:

• Understanding the neural mechanisms of depression recovery is crucial, especially in vulnerable populations like stroke patients.
• Post-stroke depression is common and impacts recovery outcomes.
• Regional microstructural changes as a basis for depression resilience are not well understood.

Purpose of the Study:

• To investigate the neural basis of depression vulnerability and resilience in stroke patients.
• To examine changes in regional microstructure associated with depression outcomes post-stroke.

Main Methods:

• Utilized multi-shell diffusion imaging and a neurite-orientation dispersion and density imaging model.
• Assessed depression symptoms and evaluated intraneurite volume fraction and neurite orientation-dispersion index (ODI) in 20 acute ischemic stroke patients.
• Performed voxel-based analysis on follow-up data after 2 months, classifying patients into depression improvement and deterioration groups.

Main Results:

• A significant group × time interaction effect on ODI was observed in the posterior cingulate cortex (PCC).
• Changes in PCC's ODI negatively correlated with depression scale score changes over 2 months.
• Increased ODI in the PCC was associated with decreased depressive symptoms.

Conclusions:

• Dendritic complexity, as indicated by ODI, in the PCC is a neural substrate for recovery from depression after stroke.
• Microstructural changes in the PCC play a role in resilience to depression following stroke.
• These findings offer insights into the neural underpinnings of post-stroke depression recovery.