Hemispheric Network Expression in Parkinson's Disease: Relationship to Dopaminergic Asymmetries.

Publication Date

2020

Journal Title

J Parkinsons Dis

Abstract

BACKGROUND: Parkinson's disease (PD) is characterized by brain metabolic networks, specifically associated with motor and cognitive manifestations. Few studies have investigated network changes in cerebral hemispheres ipsilateral and contralateral to the clinically more affected body side.

OBJECTIVE: We examined hemispheric network abnormalities and their relationship to striatal dopaminergic deficits in PD patients at different stages.

METHODS: 45 PD patients underwent dual-tracer positron emission tomography (PET) with 18F-fluorodeoxyglucose (FDG) and 18F-fluorodopa (FDOPA) in a high-resolution PET scanner. In all patients, we computed expression levels for the PD-related motor/cognition metabolic patterns (PDRP/PDCP) as well as putamen/caudate FDOPA uptake values in both hemispheres. Resulting hemispheric measures in the PD group were compared with corresponding healthy control values and assessed across disease stages.

RESULTS: Hemispheric PDRP and PDCP expression was significantly elevated contralateral and ipsilateral to the more affected body side in patients with unilateral symptoms (H&Y 1: p < 0.01) and in patients with bilateral limb involvement (H&Y 2-3: p < 0.001; H&Y 4: p < 0.003). Elevations in pattern expression were symmetrical at all disease stages. By contrast, FDOPA uptake in the caudate and putamen was reduced bilaterally (p < 0.002), with lower values on both sides at more advanced disease stages. Hemispheric uptake was asymmetrical in both striatal regions, with lower contralateral values at all disease stages. The magnitude of hemispheric uptake asymmetry was smaller with more advanced disease, reflecting greater change ipsilaterally.

CONCLUSION: Symmetrical network expression in PD represents bilateral functional effects unrelated to nigrostriatal dopaminergic asymmetries.

Volume Number

10

Issue Number

4

Pages

1737-1749

Document Type

Article

Status

Faculty, Northwell Researcher

Facility

School of Medicine; Northwell Health

Primary Department

Molecular Medicine

Additional Departments

Neurology

PMID

32925097

DOI

10.3233/JPD-202117

Comments

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