Riikka Ajalin, Haidar Al-Abdulrasul, Jouni M Tuisku, Jussi Hirvonen, Salla Lahdenpohja, Juha O Rinne, Anna Brück
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Impaired Gait, Postural Instability, and Rigidity in Relation to CB1 Receptor Availability in Parkinson's Disease.
Background: In Parkinson's disease (PD), postural instability and gait disorder (PIGD) symptoms are associated with a worse prognosis for an unknown reason.
Objective: The objective was to explore the relationship between cannabinoid receptor type 1 (CB1R) availability and motor symptoms in PD with [18 F]FMPEP-d2 positron emission tomography (PET).
Methods: Fifteen individuals with PD underwent [18 F]FMPEP-d2 PET to measure cerebral CB1R availability. The Unified Parkinson's Disease Rating Scale motor part (UPDRS-III) was used to evaluate the motor symptoms.
Results: A negative correlation was observed between [18 F]FMPEP-d2 VT and PIGD score (P = 0.002) as well as rigidity subscore (P < 0.001). Both clusters covered widespread areas of both hemispheres. In contrast, tremor or bradykinesia did not correlate to [18 F]FMPEP-d2 VT .
Conclusions: Gait, postural instability, and rigidity in PD are associated with decreased CB1R availability, unlike tremor or bradykinesia, suggesting that the endocannabinoid system has a role in the pathophysiology of different motor symptoms in PD. © 2024 The Author(s). Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.