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Amyloid-β, cortical thickness, and subsequent cognitive decline in cognitively normal oldest-old.

Pelkmans, W; Legdeur, N; Ten Kate, M; Barkhof, F; Yaqub, MM; Holstege, H; van Berckel, BNM; ... Tijms, BM; + view all (2021) Amyloid-β, cortical thickness, and subsequent cognitive decline in cognitively normal oldest-old. Annals of Clinical and Translational Neurology 10.1002/acn3.51273. (In press). Green open access

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Abstract

OBJECTIVE: To investigate the relationship between amyloid-β (Aβ) deposition and markers of brain structure on cognitive decline in oldest-old individuals with initial normal cognition. METHODS: We studied cognitive functioning in four domains at baseline and change over time in fifty-seven cognitively intact individuals from the EMIF-AD 90+ study. Predictors were Aβ status determined by [18 F]-flutemetamol PET (normal = Aβ - vs. abnormal = Aβ+), cortical thickness in 34 regions and hippocampal volume. Mediation analyses were performed to test whether effects of Aβ on cognitive decline were mediated by atrophy of specific anatomical brain areas. RESULTS: Subjects had a mean age of 92.7 ± 2.9 years, of whom 19 (33%) were Aβ+. Compared to Aβ-, Aβ+ individuals showed steeper decline on memory (β ± SE = -0.26 ± 0.09), and processing speed (β ± SE = -0.18 ± 0.08) performance over 1.5 years (P < 0.05). Furthermore, medial and lateral temporal lobe atrophy was associated with steeper decline in memory and language across individuals. Mediation analyses revealed that part of the memory decline observed in Aβ+ individuals was mediated through parahippocampal atrophy. INTERPRETATION: These results show that Aβ abnormality even in the oldest old with initially normal cognition is not part of normal aging, but is associated with a decline in cognitive functioning. Other pathologies may also contribute to decline in the oldest old as cortical thickness predicted cognitive decline similarly in individuals with and without Aβ pathology.

Type: Article
Title: Amyloid-β, cortical thickness, and subsequent cognitive decline in cognitively normal oldest-old.
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/acn3.51273
Publisher version: https://doi.org/10.1002/acn3.51273
Language: English
Additional information: © 2021 The Authors. Annals of Clinical and Translational Neurology published by Wiley Periodicals LLC on behalf of American Neurological Association This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Brain Repair and Rehabilitation
URI: https://discovery.ucl.ac.uk/id/eprint/10119351
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