量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Background: Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by chronic progressive cognitive
decline and displays underlying brain cholinergic dysfunction, providing a rationale for treatment with cholinomimetic
medication. The clinical presentations and courses of AD patients may differ by age of onset.
Objective: The objective of the present study was to illustrate the regional differences of brain acetylcholinesterase (AChE)
activity as quantified by N-[11C]methylpiperidinyl-4-acetate ([11C]MP4A) and PET using parametric whole brain analysis
and clarify those differences as a function of age.
Methods: 22 early onset AD (EOAD) with age at onset under 65, the remaining 26 as late onset AD (LOAD), and 16 healthy
controls (HC) were enrolled. Voxel-based AChE activity estimation of [11C]MP4A PET images was conducted by arterial
input and unconstrained nonlinear least-squares method with subsequent parametrical analyses. Statistical threshold was set
as Family Wise Error corrected, p-value < 0.05 on cluster-level and cluster extent over 30 voxels.
Results: Voxel-based group comparison showed that, compared to HC, both EOAD and LOAD showed cortical AChE
decrement in parietal, temporal, and occipital cortices, with wider and stringent cortical involvement in the EOAD group,
most prominently demonstrated in the temporal region. Therewas no significant correlation between age and regional cerebral
AChE activity except for a small left superior temporal region in the AD group (Brodmann’s area 22, Zmax = 5.13, 396 voxels),
whereas no significant cluster was found in the HC counterpart.
Conclusion: Difference in cortical cholinergic dysfunction between EOAD and LOAD may shed some light on the cholinomimetic
drug efficacy in AD.
Keywords: Acetylcholinesterase, age, Alzheimer’s
Voxel-Based Acetylcholinesterase PET Study in Early and Late Onset Alzheimer's Disease.
