Brain metabolic correlates of dopaminergic degeneration in de novo idiopathic Parkinson’s disease
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The aim of the present study was to evaluate the reciprocal relationships between motor impairment, dopaminergic dysfunction, and cerebral metabolism (rCMRglc) in de novo Parkinson’s disease (PD) patients.
Twenty-six de novo untreated PD patients were scanned with 123I-FP-CIT SPECT and 18F-FDG PET. The dopaminergic impairment was measured with putaminal 123I-FP-CIT binding potential (BP), estimated with two different techniques: an iterative reconstruction algorithm (BPOSEM) and the least-squares (LS) method (BPLS). Statistical parametric mapping (SPM) multiple regression analyses were performed to determine the specific brain regions in which UPDRS III scores and putaminal BP values correlated with rCMRglc.
The SPM results showed a negative correlation between UPDRS III and rCMRglc in premotor cortex, and a positive correlation between BPOSEM and rCMRglc in premotor and dorsolateral prefrontal cortex, not surviving at multiple comparison correction. Instead, there was a positive significant correlation between putaminal BPLS and rCMRglc in premotor, dorsolateral prefrontal, anterior prefrontal, and orbitofrontal cortex (p < 0.05, corrected for multiple comparison).
Putaminal BPLS is an efficient parameter for exploring the correlations between PD severity and rCMRglc cortical changes. The correlation between dopaminergic degeneration and rCMRglc in several prefrontal regions likely represents the cortical functional correlate of the dysfunction in the motor basal ganglia-cortical circuit in PD. This finding suggests focusing on the metabolic course of these areas to follow PD progression and to analyze treatment effects.
KeywordsParkinson’s disease FP-CIT FDG Basal ganglia
- 21.Fahn S, Elton RL. and members of the UPDRS Development Committee. Unified Parkinson's disease rating scale. In: Fahn S, Marsden CD, Calne DB, Goldstein M, editors. Recent development in Parkinson's disease. Florham Park: Macmillan Healthcare information; 1987. pp. 153–64.Google Scholar
- 23.Chang L. A method for attenuation correction in computed tomography. IEEE TransNuclSci. 1987;25:638–64.Google Scholar
- 31.Talairach J, Tournoux P. Co-planar stereotaxic atlas of the human brain. New York: Thieme; 1988.Google Scholar
- 45.Moeller JR, Habeck CG. Reciprocal benefits of mass-univariate and multivariate modeling in brain mapping: applications to event-related functional MRI, H215O-, and FDG-PET. Int J Biomed Imag 2006;1–13.Google Scholar
- 47.Meissner W, Guigoni C, Cirilli L, Garret M, Bioulac BH, Gross CE, et al. Impact of chronic subthalamic high-frequency stimulation on metabolic basal ganglia activity: a 2-deoxyglucose uptake and cytochrome oxidase mRNA study in a macaque model of Parkinson's disease. Eur J Neurosci. 2007;25(5):1492–500.CrossRefPubMedGoogle Scholar