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Updated: Jun 22, 2026

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
09:22

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein

Published on: January 2, 2015

18.5K

Extracellular tau clearance is governed by its aggregation state and independent of microglial activation by LPS and

Andrew Shultz1,2, Anna Vincze1, Todd T Yau1

  • 1Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, Amherst, MA, USA.

Biorxiv : the Preprint Server for Biology
|July 16, 2025
PubMed

Insights

Human microglia process extracellular tau via distinct mechanisms. While inflammation affects tau uptake, it doesn't alter tau clearance, highlighting the endo-lysosome system's role in tau pathology.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Immunology

Background:

  • Microglia, the brain's resident immune cells, play a critical role in neuroinflammation and disease.
  • The exact mechanisms by which microglia interact with and clear extracellular tau, a key protein implicated in Alzheimer's disease and other tauopathies, are not fully understood.
  • Understanding microglial function in tau pathology is crucial for developing effective therapeutic strategies.

Purpose of the Study:

  • To investigate the quantitative processing of extracellular tau by human induced pluripotent stem cell (iPSC)-derived microglia.
  • To elucidate the cellular mechanisms and kinetics involved in tau internalization and clearance by microglia.
  • To determine the impact of microglial inflammatory activation on tau processing.

Main Methods:

  • Development of a quantitative platform for analyzing tau processing in iPSC-derived microglia.
  • Utilizing iPSC-derived microglia to model human microglial responses in vitro.
  • Employing techniques to assess the uptake and degradation of monomeric and fibrillar tau species.
  • Inducing acute inflammatory activation in microglia to study its effects on tau handling.

Main Results:

  • iPSC-derived microglia effectively internalize both monomeric and fibrillar forms of tau.
  • Distinct cellular mechanisms govern the uptake of different tau species, leading to varied clearance kinetics.
  • Acute inflammatory activation modulates tau endocytosis pathways in microglia.
  • Surprisingly, microglial inflammatory activation does not significantly alter the overall clearance rate of tau.

Conclusions:

  • The microglial endo-lysosome system is a critical regulator of tau pathology.
  • Tau clearance by microglia is largely independent of acute inflammatory activation.
  • These findings decouple microglial activation states from their capacity to clear tau, offering new insights into tauopathy pathogenesis.
Keywords:
LRP1Tauendo-lysosomal dysfunctioninflammationmicrogliatau spread

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