Journal
ALZHEIMERS & DEMENTIA
Volume 12, Issue 5, Pages 538-545Publisher
WILEY
DOI: 10.1016/j.jalz.2015.07.490
Keywords
Alzheimer's disease; Down syndrome; Amyloid; PIB; PET; Dementia; Striatum; Preclinical
Categories
Funding
- Medical Research Council [98480]
- NIHR Cambridge Biomedical Research Centre
- NIHR Collaborations in Leadership for Applied Health Research and Care (CLAHRC) for East of England
- NIHR Cambridge Dementia Biomedical Research Unit
- Down Syndrome Association
- Health Foundation
- MRC [MR/M024873/1, MR/M009041/1, G1002252] Funding Source: UKRI
- Medical Research Council [G1002252] Funding Source: researchfish
- National Institute for Health Research [NF-SI-0512-10090, NF-SI-0509-10211] Funding Source: researchfish
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Introduction: Adults with Down syndrome (DS) invariably develop Alzheimer's disease (AD) neuropathology. Understanding amyloid deposition in DS can yield crucial information about disease pathogenesis. Methods: Forty-nine adults with DS aged 25-65 underwent positron emission tomography with Pittsburgh compound-B (PIB). Regional PIB binding was assessed with respect to age, clinical, and cognitive status. Results: Abnormal PIB binding became evident from 39 years, first in striatum followed by rostral prefrontal-cingulo-parietal regions, then caudal frontal, rostral temporal, primary sensorimotor and occipital, and finally parahippocampal cortex, thalamus, and amygdala. PM binding was related to age, diagnostic status, and cognitive function. Discussion: PIB binding in DS, first appearing in striatum, began around age 40 and was strongly associated with dementia and cognitive decline. The absence of a substantial time lag between amyloid accumulation and cognitive decline contrasts to sporadic/familial AD and suggests this population's suitability for an amyloid primary prevention trial. (C) 2015 The Authors. Published by Elsevier Inc. on behalf of Alzheimer's Association.
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