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PET tau and amyloid-β burden in mild Alzheimer's disease: Divergent relationship with age, cognition, and cerebrospinal fluid biomarkers

Lookup NU author(s): Professor Alan ThomasORCiD, Professor Lynn RochesterORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2017 - IOS Press and the authors. Background: Combining PET amyloid-β (Aβ) and tau imaging may be critical for tracking disease progression in Alzheimer's disease (AD). Objective:We sought to characterize the relationship betweenAβ and tau ligands as well as with other measures of pathology. Methods: We conducted a multi-center observational study in early AD (MMSE > 20) participants aged 50 to 85 y. The schedule included cognitive assessments (ADAS-Cog) and CSF measurement of A- and tau at baseline and 6 months; PET-CT imaging with Aβ ([18F]AV45) and tau ([18F]AV1451) ligands at baseline. Results: 22 participants took part in the study with 20 completing its 6-month duration and 12 having both tau and amyloid PET. The PET biomarker analysis revealed a strong negative correlation between age and tau in multiple regions. Entorhinal cortex tau and age interacted significantly in terms of cognitive change over 6 months which may have been to older participants deteriorating faster despite lower levels of cortical tau. Cortical Aβ associated with entorhinal cortex tau while CSF tau/Aβ ratio correlated strongly with cortical tau but not Aβ Conclusion: The negative relationship between age and cortical tau whereby younger patients with mild AD had relatively greater tau burden is potentially important. It suggests that younger-age onset AD may be primarily driven by tau pathology while AD developing later may depend on a multitude of pathological mechanisms. These data also suggest that PET-tau performs better than PET-amyloid in predicting the best validated AD diagnostic marker'the CSF total tau/Aβ ratio.

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Author(s): Koychev I, Gunn RN, Firouzian A, Lawson J, Zamboni G, Ridha B, Sahakian BJ, Rowe JB, Thomas A, Rochester L, Ffytche D, Howard R, Zetterberg H, MacKay C, Lovestone S

Publication type: Article

Publication status: Published

Journal: Journal of Alzheimer's Disease

Year: 2017

Volume: 60

Issue: 1

Pages: 283-293

Online publication date: 29/08/2017

Acceptance date: 30/06/2017

Date deposited: 18/10/2017

ISSN (print): 1387-2877

ISSN (electronic): 1875-8908

Publisher: IOS Press

URL: https://doi.org/10.3233/JAD-170129

DOI: 10.3233/JAD-170129

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