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Related Experiment Video

Updated: Aug 24, 2025

An In Vitro Model for Studying Tau Aggregation Using Lentiviral-mediated Transduction of Human Neurons
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Single cell transcriptomic profiling of a neuron-astrocyte assembloid tauopathy model.

Hannah Drew Rickner1, Lulu Jiang2, Rui Hong3

  • 1Department of Biology, Boston University, Boston, MA, 02215, USA.

Nature Communications
|October 21, 2022
PubMed
Summary

Researchers developed AstTau, a novel system using induced pluripotent stem cell (iPSC)-derived brain organoids to model tauopathies. This system effectively replicates key aspects of neurodegenerative disease, offering a new tool for drug discovery.

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Area of Science:

  • Neuroscience
  • Stem Cell Biology
  • Biomedical Engineering

Background:

  • Studying neurodegenerative diseases like tauopathies using induced pluripotent stem cell (iPSC)-derived brain organoids is challenging due to limitations in accurately modeling pathogenesis.
  • Existing models often fail to capture crucial neuron-glial interactions and disease progression.

Purpose of the Study:

  • To develop a novel system, termed AstTau, that accurately and rapidly recapitulates key pathological features of tauopathies in iPSC-derived neuron-astrocyte assembloids.
  • To characterize the molecular mechanisms underlying disease progression in this model, focusing on neuroinflammation and chaperone systems.
  • To evaluate the therapeutic potential of targeting the heat shock protein (HSP) chaperone system for reducing tauopathy pathology.

Main Methods:

  • Development of the AstTau system using iPSC-derived neuron-astrocyte assembloids.
  • Induction of toxic human tau oligomer propagation within the assembloids.
  • Characterization of neuropathological hallmarks using immunochemistry and single-cell transcriptomic profiling.
  • Assessment of neurodegeneration and reactive astrogliosis.
  • Treatment with an HSP90 inhibitor (PU-H71) to evaluate therapeutic efficacy.

Main Results:

  • The AstTau system successfully propagated toxic tau oligomers, leading to neuronal and astrocytic pathology, including misfolded, phosphorylated, and fibrillar tau.
  • Significant neurodegeneration and reactive astrogliosis were observed, closely mimicking late-stage changes in adult neurodegeneration.
  • Single-cell transcriptomic analysis revealed substantial alterations in neuroinflammatory and heat shock protein (HSP) chaperone systems.
  • Treatment with PU-H71 markedly reduced tau pathology and neurodegeneration, demonstrating the system's responsiveness to therapeutic intervention.

Conclusions:

  • The AstTau system provides a robust and reproducible platform for studying tauopathies and their associated neuron-glial interactions.
  • It accurately recapitulates key pathological features and molecular changes, including neuroinflammation and HSP system dysfunction.
  • AstTau shows significant promise as a rapid drug discovery tool for tauopathies, with HSP90 inhibition presenting a potential therapeutic strategy.