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Related Experiment Video

Updated: Nov 7, 2025

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Amyloid-Beta Mediates Homeostatic Synaptic Plasticity.

Christos Galanis1,2, Meike Fellenz3, Denise Becker3

  • 1Department of Neuroanatomy, Institute of Anatomy and Cell Biology, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 30, 2021
PubMed
Summary

Amyloid precursor protein (APP) is crucial for homeostatic synaptic plasticity. Its processing via the amyloidogenic pathway, not APPsα, is essential for synaptic strengthening in the brain.

Keywords:
APP processingAlzheimer’s diseaseamyloid-betahomeostatic plasticitysAPPalphasecretases

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • The physiological functions of amyloid precursor protein (APP) remain incompletely understood.
  • APP and its secreted ectodomain, APPsα, are implicated in regulating synaptic plasticity, particularly Hebbian plasticity.
  • The role of APP in homeostatic synaptic plasticity requires further investigation.

Purpose of the Study:

  • To investigate the role of APP in homeostatic synaptic plasticity.
  • To determine the specific APP processing pathway involved in homeostatic plasticity.

Main Methods:

  • Organotypic tissue cultures from APP knockout (APP-/-) mice were utilized.
  • Experiments involved assessing synaptic strengthening in dentate granule cells.
  • Pharmacological inhibition of β- and γ-secretase and analysis of synaptopodin-deficient cultures were performed.

Main Results:

  • APP knockout mice exhibited impaired homeostatic synaptic plasticity.
  • Amyloid-β, but not APPsα, rescued the homeostatic plasticity defect.
  • Inhibition of β- or γ-secretase or absence of synaptopodin abolished homeostatic plasticity.

Conclusions:

  • APP processing through the amyloidogenic pathway is critical for homeostatic synaptic plasticity.
  • This finding highlights a novel physiological role for APP processing in brain function.
  • The results suggest implications for brain states with elevated amyloid-β levels.