Amyloid Imaging in Alzheimer’s Disease and Other Dementias View Full Text


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Article Info

DATE

2009-04-07

AUTHORS

Michelle T. Fodero-Tavoletti, Roberto Cappai, Catriona A. McLean, Kerryn E. Pike, Paul A. Adlard, Tiffany Cowie, Andrea R. Connor, Colin L. Masters, Christopher C. Rowe, Victor L. Villemagne

ABSTRACT

With the advent of new therapeutic strategies aimed at reducing β-amyloid (Aβ) burden in the brain to potentially prevent or delay functional and irreversible cognitive loss, there is increased interest in developing agents that allow assessment of Aβ burden in vivo. Molecular neuroimaging techniques such as positron emission tomography (PET), in conjunction with related biomarkers in plasma and cerebrospinal fluid, are proving valuable in the early and differential diagnosis of Alzheimer’s disease (AD). 11C-PiB PET has proven useful in the discrimination of dementias, showing significantly higher PiB retention in grey matter of AD patients when compared with healthy controls or patients with frontotemporal dementia. 11C-PiB PET also appears to be more accurate than FDG for the diagnosis of AD. Despite apparently underestimating the Aβ burden in the brain, 11C-PiB PET is an optimal method to differentiate healthy controls from AD, matching histopathological reports in aging and dementia and reflecting the true regional density of Aβ plaques in cortical areas. High striatal Aβ deposition seems to be typical for carriers of familial forms of AD, whilst ApoE ε4 carriers, independent of diagnosis or disease severity, present with higher Aβ burden than non- ε4 carriers. Characterization of the binding properties of PiB has shown that despite binding to other misfolded proteins in vitro, PiB is extremely selective for Aβ at the concentrations achieved during a PET scan. Aβ burden as assessed by PET does not correlate with measures of cognition or cognitive decline in AD. Approximately 30% of apparently healthy older people, and 50–60% of people with mild cognitive impairment, present with cortical 11C-PiB retention. In these groups, Aβ burden does correlate with episodic memory and rate of memory decline. These observations suggest that Aβ deposition is not part of normal ageing, supporting the hypothesis that Αβ deposition occurs well before the onset of symptoms and is likely to represent preclinical AD. Further longitudinal observations, coupled with different disease-specific tracers and biomarkers are required not only to confirm this hypothesis, but also to better elucidate the role of Αβ deposition in the course of Alzheimer’s disease. More... »

PAGES

246-261

References to SciGraph publications

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s11682-009-9067-2

    DOI

    http://dx.doi.org/10.1007/s11682-009-9067-2

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1034039863

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/22005989


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