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Published in: Acta Neuropathologica 2/2021

01-02-2021 | Alzheimer's Disease | Original Paper

In vitro amplification of pathogenic tau conserves disease-specific bioactive characteristics

Authors: Hong Xu, Mia O’Reilly, Garrett S. Gibbons, Lakshmi Changolkar, Jennifer D. McBride, Dawn M. Riddle, Bin Zhang, Anna Stieber, Jeffrey Nirschl, Soo-Jung Kim, Kevt-her Hoxha, Kurt R. Brunden, Gerard D. Schellenberg, John Q. Trojanowski, Virginia M.-Y. Lee

Published in: Acta Neuropathologica | Issue 2/2021

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Abstract

The microtubule-associated protein tau (tau) forms hyperphosphorylated aggregates in the brains of tauopathy patients that can be pathologically and biochemically defined as distinct tau strains. Recent studies show that these tau strains exhibit strain-specific biological activities, also referred to as pathogenicities, in the tau spreading models. Currently, the specific pathogenicity of human-derived tau strains cannot be fully recapitulated by synthetic tau preformed fibrils (pffs), which are generated from recombinant tau protein. Reproducing disease-relevant tau pathology in cell and animal models necessitates the use of human brain-derived tau seeds. However, the availability of human-derived tau is extremely limited. Generation of tau variants that can mimic the pathogenicity of human-derived tau seeds would significantly extend the scale of experimental design within the field of tauopathy research. Previous studies have demonstrated that in vitro seeding reactions can amplify the beta-sheet structure of tau protein from a minute quantity of human-derived tau. However, whether the strain-specific pathogenicities of the original, human-derived tau seeds are conserved in the amplified tau strains has yet to be experimentally validated. Here, we used biochemically enriched brain-derived tau seeds from Alzheimer’s disease (AD), corticobasal degeneration (CBD) and progressive supranuclear palsy (PSP) patient brains with a modified seeding protocol to template the recruitment of recombinant 2N4R (T40) tau in vitro. We quantitatively interrogated efficacy of the amplification reactions and the pathogenic fidelity of the amplified material to the original tau seeds using recently developed sporadic tau spreading models. Our data suggest that different tau strains can be faithfully amplified in vitro from tau isolated from different tauopathy brains and that the amplified tau variants retain their strain-dependent pathogenic characteristics.
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Metadata
Title
In vitro amplification of pathogenic tau conserves disease-specific bioactive characteristics
Authors
Hong Xu
Mia O’Reilly
Garrett S. Gibbons
Lakshmi Changolkar
Jennifer D. McBride
Dawn M. Riddle
Bin Zhang
Anna Stieber
Jeffrey Nirschl
Soo-Jung Kim
Kevt-her Hoxha
Kurt R. Brunden
Gerard D. Schellenberg
John Q. Trojanowski
Virginia M.-Y. Lee
Publication date
01-02-2021
Publisher
Springer Berlin Heidelberg
Published in
Acta Neuropathologica / Issue 2/2021
Print ISSN: 0001-6322
Electronic ISSN: 1432-0533
DOI
https://doi.org/10.1007/s00401-020-02253-4

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