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Updated: Nov 23, 2025
An In Vitro Model for Studying Tau Aggregation Using Lentiviral-mediated Transduction of Human Neurons
Published on: May 23, 2019
In vitro amplification of pathogenic tau conserves disease-specific bioactive characteristics
Hong Xu1, Mia O'Reilly2, Garrett S Gibbons2
1Department of Pathology and Laboratory Medicine, Institute On Aging and Center for Neurodegenerative Disease Research, University of Pennsylvania School of Medicine, Philadelphia, PA, 19104, USA. hongxu@upenn.edu.
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.
Insights
Researchers successfully amplified distinct tau strains from patient brains in vitro. These amplified tau variants retain their original strain-specific disease characteristics, aiding tauopathy research.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Tauopathy patients exhibit distinct, hyperphosphorylated tau strains.
- Human-derived tau strains show strain-specific pathogenicity in models.
- Synthetic tau fibrils poorly replicate human tau strain pathogenicity.
Purpose of the Study:
- To validate if in vitro amplification of tau seeds conserves strain-specific pathogenicity.
- To generate tau variants mimicking human-derived tau seed pathogenicity for research.
Main Methods:
- Used modified seeding protocols with brain-derived tau seeds from Alzheimer's disease (AD), corticobasal degeneration (CBD), and progressive supranuclear palsy (PSP) patients.
- Templated the recruitment of recombinant 2N4R (T40) tau in vitro.
- Quantitatively assessed amplification efficacy and pathogenic fidelity using tau spreading models.
Main Results:
- Successfully amplified distinct tau strains in vitro from different tauopathy patient brains.
- Amplified tau variants faithfully retained the strain-dependent pathogenic characteristics of the original seeds.
- Demonstrated conservation of strain-specific biological activities in amplified tau.
Conclusions:
- In vitro amplification is a viable method to faithfully reproduce strain-specific tau pathologies.
- Amplified tau variants can serve as reliable tools to study tauopathy mechanisms.
- This approach overcomes limitations of limited human-derived tau availability.
