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In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein

Published on: January 2, 2015

APOE isoform-associated tau oligomer polymorphs differ in synaptotoxicity and seeding activity.

Naomi Moreno^1,2, Nikita Shchankin^1,2, Leiana Fung^1,2

¹Mitchell Center for Neurodegenerative Diseases, University of Texas Medical Branch, Galveston, Texas, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association

|December 13, 2025

Summary

Apolipoprotein E (APOE) isoforms influence tau aggregate structure and toxicity in Alzheimer's disease (AD). APOE ε4-associated tau oligomers are particularly toxic, impacting synaptic plasticity and seeding activity, suggesting new therapeutic targets for AD.

Keywords:

aggregation oligomers polymorphs synaptic functioning synaptotoxicity tau

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Last Updated: Jan 8, 2026

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Area of Science:

Neuroscience
Biochemistry
Genetics

Background:

Pathological tau aggregates exhibit diverse polymorphic forms in diseases like Alzheimer's disease (AD).
The influence of apolipoprotein E (APOE) isoforms (ε2, ε3, ε4) on tau aggregate polymorphism and associated pathology remains largely unknown.
APOE ε4 is a significant genetic predictor of late-onset AD.

Purpose of the Study:

To investigate tau aggregate polymorphism across different APOE isoforms.
To assess the conformational and bioactivity differences of tau oligomers influenced by APOE genotypes.
To determine the impact of APOE-associated tau oligomers on synaptic plasticity and seeding activity.

Main Methods:

Analysis of tau oligomers from 14 patients with diverse APOE genotypes.
Assessment of conformational properties through proteolytic stability and cleavage site profiling.
Evaluation of bioactivity, including effects on synaptic plasticity and tau seeding potential.

Main Results:

Tau oligomers display distinct conformations and proteolytic profiles dependent on APOE isoform.
APOE ε4-associated tau oligomers exhibit the highest potency in impairing synaptic plasticity.
APOE ε4-associated tau oligomers show significantly higher seeding activity compared to other isoforms.
Synaptotoxicity and seeding activity of tau oligomers are independent characteristics.

Conclusions:

APOE isoforms are linked to distinct tau oligomer polymorphs with varying bioactivities.
APOE ε4-associated tau oligomers represent a particularly toxic species, strongly impacting synaptic function.
Targeting specific tau polymorphs, especially those associated with APOE ε4, offers a promising therapeutic strategy for AD.
Understanding APOE's role in tau pathology is crucial for developing effective AD treatments.