title: Imaging movement-related activity in medicated Parkin-associated and sporadic Parkinson's disease.
abstract: Treatment-related motor complications such as dyskinesias are a major problem in the long-term management of Parkinson's disease (PD). In sporadic PD, a relatively early onset of the disease is known to be associated with an early development of dyskinesias. Although linked with early onset, patients with Parkin-associated PD often show a stable long-term response to dopaminergic therapy without developing treatment-induced motor complications. Therefore, we reasoned that this difference in vulnerability to develop dyskinesias under long-term dopaminergic therapy may be associated with differences in movement-related activation patterns in Parkin-associated compared to sporadic PD. To test this hypothesis, medicated non-dyskinetic patients with either Parkin-associated or sporadic PD underwent functional magnetic resonance imaging (fMRI) while performing externally specified or internally selected movements. Patients with Parkin-associated and sporadic PD showed no difference in movement-related activation patterns. Moreover, the covariates 'age' and 'disease duration' similarly influenced brain activation in both patient groups. The present finding suggests that a stable long-term motor response in some patients with Parkin-associated PD may not be related to differences in cortical recruitment. In conclusion, our findings corroborate a substantial pathophysiologic overlap between Parkin-associated and sporadic PD and lend further support to the notion that Parkin-associated PD is a suitable genetic model for sporadic PD.
authors.affiliation: Toronto Western Research Institute, University of Toronto, Canada. tvaneimeren@gmail.com
authors.forename: Thilo
authors.initials: T
authors.lastname: van Eimeren
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Binkofski
authors.forename: Carsten
authors.initials: C
authors.lastname: Buhmann
authors.forename: Johann
authors.initials: J
authors.lastname: Hagenah
authors.forename: Antonio P
authors.initials: AP
authors.lastname: Strafella
authors.forename: Peter P
authors.initials: PP
authors.lastname: Pramstaller
authors.forename: Hartwig R
authors.initials: HR
authors.lastname: Siebner
authors.forename: Christine
authors.initials: C
authors.lastname: Klein
mesh_terms: D000328:Adult; D000368:Aged; D001921:Brain / Q000503:physiopathology*; D001931:Brain Mapping; D020820:Dyskinesias / Q000235:genetics; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D009154:Mutation; D010300:Parkinson Disease / Q000235:genetics / Q000503:physiopathology*; D044767:Ubiquitin-Protein Ligases / Q000235:genetics
chemical_list: D044767:Ubiquitin-Protein Ligases; C111567:parkin protein