Mapping Cholinergic Synaptic Loss in Parkinson's Disease: An [18F]FEOBV PET Case-Control Study

Area of Science:

• Neuroscience
• Neurology
• Radiology

Background:

• Cholinergic system dysfunction is linked to cognitive decline in Parkinson's disease (PD).
• Regional brain differences in cholinergic degeneration may correlate with specific PD symptoms and disease progression.
• Olfactory dysfunction and motor symptoms can also be influenced by cholinergic changes.

Purpose of the Study:

• To map and quantify regional cerebral cholinergic alterations in non-demented Parkinson's disease patients.
• To investigate the relationship between cholinergic deficits and clinical/neuropsychological data in early-to-moderate PD.

Main Methods:

• Positron emission tomography (PET) imaging using [18F]FEOBV in 15 non-demented PD patients and 15 controls.
• Volume of Interest (VOI)-based analysis and vertex-wise cluster analysis to assess regional variations.
• Exploration of correlations between imaging findings and clinical/neuropsychological assessments.

Main Results:

• Significant global neocortical reduction in [18F]FEOBV uptake (38%) in PD patients.
• Most severe cholinergic deficits observed in occipital and posterior temporo-parietal regions.
• Strong correlation between asymmetric motor symptoms and neocortical [18F]FEOBV asymmetry.

Conclusions:

• Cortical cholinergic degeneration is a prominent feature in non-demented PD patients.
• Regional cholinergic deficits suggest uneven brain involvement and potential for tracking disease progression.
• Asymmetric cholinergic degeneration parallels ipsilateral dopaminergic degeneration, impacting motor symptoms.