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Updated: May 7, 2026

Preparation of Oligomeric β-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices
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Amyloid-β oligomers induce synaptic damage via Tau-dependent microtubule severing by TTLL6 and spastin

Hans Zempel1, Julia Luedtke, Yatender Kumar

  • 1DZNE, German Center for Neurodegenerative Diseases, Bonn, Germany.

The EMBO Journal
|September 26, 2013
PubMed

Insights

Alzheimer disease involves Tau protein missorting into dendrites, causing microtubule (MT) breakdown and neuronal damage. Stabilizing MTs may offer a therapeutic strategy against this neurodegenerative condition.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Alzheimer disease (AD) is characterized by amyloid-beta (Aβ) and Tau pathology, synaptic loss, and microtubule (MT) instability.
  • Understanding the interplay between Aβ, Tau, and MT dynamics is crucial for developing effective AD therapies.

Purpose of the Study:

  • To investigate the mechanisms underlying Aβ-induced Tau missorting and subsequent MT breakdown in neurons.
  • To identify key molecular players involved in Tau/MT system alterations in AD pathogenesis.
  • To explore the therapeutic potential of MT stabilization in AD.

Main Methods:

  • Primary neuron cultures exposed to Aβ oligomers.
  • Analysis of Tau/MT system dynamics, including Tau localization, MT stability, and synaptic integrity.
  • Utilized Tau-knockout (TauKO) mouse models and transgenic mice overexpressing Tau.
  • Investigated the roles of spastin, Tubulin-Tyrosine-Ligase-Like-6 (TTLL6), and Microtubule-Affinity-Regulating-Kinase (MARK).

Main Results:

  • Aβ oligomers induce Tau missorting into dendrites, leading to MT breakdown mediated by spastin recruitment via MT polyglutamylation.
  • TTLL6 translocalization into dendrites triggers MT polyglutamylation and spastin-mediated MT severing.
  • Newly synthesized Tau, not axonally derived, is responsible for dendritic MT pathology.
  • TauKO neurons exhibit resistance to Aβ toxicity due to prevention of TTLL6 mislocalization and MT polyglutamylation.
  • MARK kinase is required for recovery from Aβ insult.
  • Tau reintroduction in TauKO neurons restores Aβ toxicity, dependent on Tau phosphorylation.
  • Tau overexpression in transgenic mice leads to TTLL6 translocalization and decreased MT stability.

Conclusions:

  • Tau missorting into dendrites is a key mechanism driving MT breakdown and synaptic loss in response to Aβ oligomers.
  • TTLL6 and spastin are critical mediators of Aβ-induced MT pathology.
  • MT stabilization emerges as a promising therapeutic strategy for Alzheimer disease.

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