Downregulation of striatal dopamine D2 receptors in advanced Parkinson's disease contributes to the development of motor fluctuation.

Abstract:

:The purpose of this study was to evaluate the contribution of the postsynaptic mechanism to the development of motor fluctuation in advanced Parkinson's disease (PD). We used 123I-iodobenzamide single-photon emission computed tomography to measure the striatal dopamine D2 receptor densities in early levodopa-naïve PD, chronic PD with stable levodopa response, and advanced PD with fluctuating levodopa response. The basal ganglia/frontal cortex ratios at both hemispheres were calculated and averaged. PD patients with fluctuating levodopa response showed a significant decrease in striatal dopamine D2 receptor densities compared to those with early (1.57+/- 0.20 vs. 1.77 +/- 0.12, p = 0.009) or chronic stable PD (1.57 +/- 0.20 vs. 1.77 +/- 0.10, p = 0.024). We conclude that the decreased D2 receptor densities in advanced PD reduced the 'safety factor' for synaptic transmission and contributed to the development of motor fluctuation.

journal_name

Eur Neurol

journal_title

European neurology

authors

Hwang WJ,Yao WJ,Wey SP,Shen LH,Ting G

doi

10.1159/000047962

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

113-7

issue

2

eissn

0014-3022

issn

1421-9913

pii

47962

journal_volume

47

pub_type

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