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Alzheimer's Research & Therapy
Published in: Alzheimer's Research & Therapy 1/2016

Open Access 01-12-2016 | Research

Regional tau deposition measured by [18F]THK5317 positron emission tomography is associated to cognition via glucose metabolism in Alzheimer’s disease

Authors: Laure Saint-Aubert, Ove Almkvist, Konstantinos Chiotis, Rita Almeida, Anders Wall, Agneta Nordberg

Published in: Alzheimer's Research & Therapy | Issue 1/2016

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Abstract

Background

The recent development of tau-specific positron emission tomography (PET) tracers has allowed in vivo quantification of regional tau deposition and offers the opportunity to monitor the progression of tau pathology along with cognitive impairment. In this study, we investigated the relationships of cerebral tau deposition ([18F]THK5317-PET) and metabolism ([18F]FDG-PET) with concomitant cognitive function in patients with probable Alzheimer’s disease (AD).

Methods

Nine patients diagnosed with AD dementia and 11 with prodromal AD (mild cognitive impairment, amyloid-positive on [11C]PiB-PET) were included in this study. All patients underwent PET scans using each tracer, as well as episodic memory and global cognition assessment. Linear models were used to investigate the association of regional [18F]THK5317 retention and [18F]FDG uptake with cognition. The possible mediating effect of local metabolism on the relationship between tau deposition and cognitive performance was investigated using mediation analyses.

Results

Significant negative associations were found between [18F]THK5317 regional retention, mainly in temporal regions, and both episodic memory and global cognition. Significant positive associations were found between [18F]FDG regional uptake and cognition. The association of [18F]FDG with global cognition was regionally more extensive than that of [18F]THK5317, while the opposite was observed with episodic memory, suggesting that [18F]THK5317 retention might be more sensitive than [18F]FDG regional uptake to early cognitive impairment. Finally, [18F]FDG uptake had a mediating effect on the relationship between [18F]THK5317 retention in temporal regions and global cognition.

Conclusions

These findings suggest a mediating role for local glucose metabolism in the observed association between in vivo tau deposition and concomitant cognitive impairment in AD.
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Metadata
Title
Regional tau deposition measured by [18F]THK5317 positron emission tomography is associated to cognition via glucose metabolism in Alzheimer’s disease
Authors
Laure Saint-Aubert
Ove Almkvist
Konstantinos Chiotis
Rita Almeida
Anders Wall
Agneta Nordberg
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Alzheimer's Research & Therapy / Issue 1/2016
Electronic ISSN: 1758-9193
DOI
https://doi.org/10.1186/s13195-016-0204-z

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