Nicotinic α4β2 acetylcholine receptors and cognitive function in Parkinson's disease.

Abstract:

BACKGROUND:Idiopathic Parkinson's disease (IPD) is characterized by the clinical motor symptoms of hypokinesia, rigidity, and tremor. Apart from these motor symptoms, cognitive deficits often occur in IPD. The positive effect of cholinesterase inhibitors on cognitive deficits in IPD and findings of earlier molecular imaging studies suggest that the cholinergic system plays an important role in the origin of cognitive decline in IPD. METHODS:Twenty-five non-demented patients with IPD underwent a 5-[123I]iodo-3-[2(S)-2-azetidinylmethoxy]pyridine (5-I-A-85380) SPECT to visualize α4β2 nicotinic acetylcholine receptors (nAchR) and cognitive testing with the CERAD (Consortium to Establish a Registry for Alzheimer's Disease) battery to identify domains of cognitive dysfunction. RESULTS:In the CERAD, the IPD patients exhibited deficits in non-verbal memory, attention, psychomotor velocity, visuoconstructive ability, and executive functions. After Bonferroni correction for multiple comparisons, we found significant correlations between performance of the CERAD subtests Boston Naming Test (a specific test for visual perception and for detection of word-finding difficulties) and Word List Intrusions (a specific test for learning capacity and memory for language information) vs binding of α4β2 nAchR in cortical (the right superior parietal lobule) and subcortical areas (the left thalamus, the left posterior subcortical region, and the right posterior subcortical region). CONCLUSIONS:These significant correlations between the results of the CERAD subtests and the cerebral α4β2 nAchR density, as assessed by 5-I-A-85380 SPECT, indicate that cerebral cholinergic pathways are relevant to cognitive processing in IPD.

journal_name

Acta Neurol Scand

authors

Lorenz R,Samnick S,Dillmann U,Schiller M,Ong MF,Faßbender K,Buck A,Spiegel J

doi

10.1111/ane.12259

subject

Has Abstract

pub_date

2014-09-01 00:00:00

pages

164-71

issue

3

eissn

0001-6314

issn

1600-0404

journal_volume

130

pub_type

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