期刊
NEUROBIOLOGY OF LEARNING AND MEMORY
卷 90, 期 2, 页码 404-412出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.nlm.2008.05.006
关键词
A-85380; Alzheimer's disease; cholinergic; cognition; dementia; molecular imaging; nicotinic receptors; PET imaging
资金
- Austin Hospital Medical Research
- Australian Rotary Health
- Monash University Postgraduate
- National Health and Medical Research Council (NHMRC) of Australia
- Alzheimer's Australia Research Foundation (AARF)
Neuronal nicotinic acetylcholine receptors (nAChRs) are critical for higher order cognitive processes. Post-mortem studies suggest reductions in nAChRs (particularly the 002 subtype) with ageing and in Alzheimer's disease (AD). This study aimed to; (1) quantify nAChR distribution in vivo with 2-[F-18]fluoro-A-85380 (2-FA) in 15 early AD patients compared to 14 age-matched, healthy controls (HC) and (2) correlate nAChR distribution with cognitive performance in both groups. All participants were nonsmokers and underwent cognitive testing along with a dynamic PET scan after injection of 200 MBq of 2-FA. Brain regional 2-FA binding was assessed through a simplified estimation of Distribution Volume (DVS). The AD group differed significantly from HC on all cognitive measures employed, with impairments on measures of attention, working memory, language, executive function, visuospatial ability, verbal learning and verbal memory (p<.05). Contrary to post-mortem data this study found no evidence of in vivo nAChR loss in early AD despite significant cognitive impairment. Furthermore, no correlation between nAChR and cognitive performance was found for either group. The findings of the current study suggest preservation of nAChRs early in AD supporting previous studies. It is possible that while the clinical 2-FA PET method described here may be insensitive in detecting changes in early AD, such changes may be detected in more advanced stages of the illness. (C) 2008 Elsevier Inc. All rights reserved.
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