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Published in: Acta Neuropathologica 3/2019

01-03-2019 | Alzheimer's Disease | Original Paper

Amyloid-β pathology enhances pathological fibrillary tau seeding induced by Alzheimer PHF in vivo

Authors: Cristina Vergara, Sarah Houben, Valérie Suain, Zehra Yilmaz, Robert De Decker, Virginie Vanden Dries, Alain Boom, Salwa Mansour, Karelle Leroy, Kunie Ando, Jean-Pierre Brion

Published in: Acta Neuropathologica | Issue 3/2019

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Abstract

Neuropathological analysis in Alzheimer’s disease (AD) and experimental evidence in transgenic models overexpressing frontotemporal dementia with Parkinsonism linked to chromosome 17 (FTDP-17) mutant tau suggest that amyloid-β pathology enhances the development of tau pathology. In this work, we analyzed this interaction independently of the overexpression of an FTDP-17 mutant tau, by analyzing tau pathology in wild-type (WT), 5xFAD, APP−/− and tau−/− mice after stereotaxic injection in the somatosensory cortex of short-length native human AD-PHF. Gallyas and phosphotau-positive tau inclusions developed in WT, 5xFAD, and APP−/− but not in tau−/− mice. Ultrastructural analysis demonstrated their intracellular localization and that they were composed of straight filaments. These seeded tau inclusions were composed only of endogenous murine tau exhibiting a tau antigenic profile similar to tau aggregates in AD. Insoluble tau level was higher and ipsilateral anteroposterior and contralateral cortical spreading of tau inclusions was more important in AD-PHF-injected 5xFAD mice than in WT mice. The formation of large plaque-associated dystrophic neurites positive for oligomeric and phosphotau was observed in 5xFAD mice injected with AD-PHF but never in control-injected or in non-injected 5xFAD mice. An increased level of the p25 activator of CDK5 kinase was found in AD-PHF-injected 5xFAD mice. These data demonstrate in vivo that the presence of Aβ pathology enhances experimentally induced tau seeding of endogenous, wild-type tau expressed at physiological level, and demonstrate the fibrillar nature of heterotopically seeded endogenous tau. These observations further support the hypothesis that Aβ enhances tau pathology development in AD through increased pathological tau spreading.
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Metadata
Title
Amyloid-β pathology enhances pathological fibrillary tau seeding induced by Alzheimer PHF in vivo
Authors
Cristina Vergara
Sarah Houben
Valérie Suain
Zehra Yilmaz
Robert De Decker
Virginie Vanden Dries
Alain Boom
Salwa Mansour
Karelle Leroy
Kunie Ando
Jean-Pierre Brion
Publication date
01-03-2019
Publisher
Springer Berlin Heidelberg
Published in
Acta Neuropathologica / Issue 3/2019
Print ISSN: 0001-6322
Electronic ISSN: 1432-0533
DOI
https://doi.org/10.1007/s00401-018-1953-5

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