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Altered Processing of β-Amyloid in SH-SY5Y Cells Induced by Model Senescent Microglia

Dafina M Angelova1, David R Brown1

  • 1Department of Biology and Biochemistry , University of Bath , Bath BA2 7AY , U.K.

ACS Chemical Neuroscience
|July 28, 2018
PubMed

Insights

Aging microglia, characterized by iron overload, contribute to increased beta-amyloid, a key factor in neurodegenerative diseases like Alzheimer's. This study introduces a novel model for brain aging research.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Aging Research

Background:

  • Aging is the primary risk factor for neurodegenerative diseases.
  • Cellular aging, particularly in microglia, impairs nervous system function.
  • Aged microglia exhibit increased iron content, impacting cellular interactions.

Purpose of the Study:

  • To develop and utilize a model system for senescent microglia.
  • To investigate the role of iron-loaded, senescent microglia in beta-amyloid processing.
  • To explore the implications for Alzheimer's disease pathogenesis.

Main Methods:

  • Created a model of senescent microglia by iron-overloading a human microglial cell line.
  • Co-cultured model senescent microglia with SH-SY5Y neuroblastoma cells.
  • Analyzed changes in secretory profiles, beta-amyloid levels, insulin-degrading enzyme, autophagy, and ER stress.

Main Results:

  • Iron-overloaded microglia exhibited a senescent phenotype and altered secretory profile.
  • Co-culture with senescent microglia increased extracellular beta-amyloid.
  • Reduced insulin-degrading enzyme release by senescent microglia led to beta-amyloid accumulation.
  • Senescent microglia displayed decreased autophagy and increased ER stress.

Conclusions:

  • Aging microglia, influenced by iron, can promote beta-amyloid accumulation, potentially driving neurodegeneration.
  • The developed in vitro model of senescent microglia is valuable for studying brain aging and Alzheimer's disease.
  • Understanding microglial aging is crucial for developing therapeutic strategies for neurodegenerative disorders.
Keywords:
APPER stressautophagyinsulin degrading enzymemicrogliaβ-amyloid

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