Decreases in soluble α-synuclein in frontal cortex correlate with cognitive decline in the elderly

Document Type

Article

Abstract

α-Synuclein (ASN) is a presynaptic protein and major component of Lewy bodies. It is considered important in the pathogenesis of Alzheimer's disease (AD), but its relevance to progressive cognitive decline in aging is largely unknown. To address this issue, ASN immunoreactivity was measured in frontal cortex of elderly individuals with no cognitive impairment (NCI), mild cognitive impairment (MCI) and early AD using a Western blot technique and a polyclonal antibody to ASN. ASN immunoreactivity was significantly lower in AD than in MCI and NCI, but there was no difference between MCI and NCI. The ASN immunoreactivity correlated with CERAD diagnosis, as well as Mini-Mental State Exam (MMSE) score, global neuropsychologic z-score and some, but not all, frontal neuropsychology measures. Clinical correlations were stronger for ASN than synaptophysin immunoreactivity assessed in a similar manner. The correlation with MMSE was robust when NCI cases were considered separately, suggesting that decreases in soluble ASN may be an early feature of cognitive decline in aging and AD. © 2004 Elsevier Ireland Ltd. All rights reserved.

Keywords

Alzheimer's disease, Mild cognitive impairment, Synaptophysin, Synuclein

Publication Date

4-8-2004

Publication Title

Neuroscience Letters

ISSN

03043940

Volume

359

Issue

1-2

First Page

104

Last Page

108

PubMed ID

15050722

Digital Object Identifier (DOI)

10.1016/j.neulet.2004.01.044

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