Abstract
Little is known about cholinergic activity in the early stage of Alzheimer's disease. We investigated differences in the distribution of vesicular acetylcholine transporter, using [(123)I]-iodobenzovesamicol ([(123)I]-IBVM) and Single Photon Computed Tomography (SPECT), in early AD and age-matched controls. Sixteen subjects (8 controls, 8 AD) underwent [(123)I]-IBVM SPECT scanning, T1-weighted anatomic scan by Magnetic Resonance (MR) imaging and Mini-Mental State Evaluation (MMSE). Image analysis, using Statistical Parametric Mapping (SPM 02), involved coregistration of each SPECT image to the MR scan, followed by a spatial normalisation to the Montreal Neurological Institute standard brain and a smoothing of each SPECT image. Group effects and correlation were assessed using two sample t-tests and linear regression respectively. Atrophy difference between the two groups was assessed by voxel-based morphometry of each MR scan using two sample t-tests. MMSE values were significantly different between AD and controls. Relative to controls, a significant decrease in [(123)I]-IBVM binding (47-62%) was apparent in AD subjects in cingulate cortex and parahippocampal-amygdaloïd complex. These patterns appeared to be independent of atr...Continue Reading
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