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A Novel In Vitro Live-imaging Assay of Astrocyte-mediated Phagocytosis Using pH Indicator-conjugated Synaptosomes
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Impaired astrocytic synaptic function by peripheral cholesterol metabolite 27-hydroxycholesterol.

Fokion Spanos1, Gorka Gerenu1,2,3, Julen Goikolea1

  • 1Department of Neurobiology Care Sciences and Society, Division of Neurogeriatrics, Karolinska Institutet, Center for Alzheimer Research, Stockholm, Sweden.

Frontiers in Cellular Neuroscience
|April 23, 2024
PubMed
Summary
This summary is machine-generated.

High levels of 27-hydroxycholesterol (27-OH) impair astrocyte function and glutamate transporter expression, contributing to synaptic dysfunction in Alzheimer's disease (AD). This study reveals a novel mechanism linking brain oxysterol imbalance to AD pathology.

Keywords:
27-hydroxycholesterol3D co-culture systemAlzheimer’s diseaseastrocytescholesterol metabolismneurospheroidsynaptic dysfunction

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Astrocytes are crucial for brain function, including synaptic transmission and cognition.
  • Alzheimer's disease (AD) is linked to cholesterol metabolism imbalance, specifically elevated 27-hydroxycholesterol (27-OH).
  • The impact of 27-OH on astrocyte function remains largely unclear.

Purpose of the Study:

  • To investigate the effects of elevated 27-OH on astrocyte function in vivo and in vitro.
  • To explore the role of astrocyte dysfunction in 27-OH-induced synaptic deficits.
  • To establish a link between oxysterol imbalance and neurodegeneration in AD.

Main Methods:

  • Utilized Cyp27Tg mice, a model for brain oxysterol imbalance.
  • Administered high-cholesterol diets to wild-type (WT) mice.
  • Developed a 3D co-culture system of mouse embryonic cells for in vitro studies.
  • Assessed astrocyte function, glutamate transporter expression (GLT-1, GLAST), and GFAP levels.

Main Results:

  • Elevated 27-OH decreased astrocyte function in vivo and downregulated glutamate transporters (GLT-1) in the hippocampus of Cyp27Tg mice.
  • High-cholesterol diets also led to GLT-1 downregulation in WT mice.
  • 3D co-cultures revealed 27-OH-induced astrocyte degeneration and glutamate transporter downregulation (GLT-1, GLAST), effects not seen in 2D cultures.
  • Downregulation of glutamate transporters suggests potential neuronal hyperexcitability and synaptic dysfunction.

Conclusions:

  • Elevated 27-OH impairs astrocyte function and glutamate transporter expression, contributing to synaptic dysfunction.
  • Oxysterol imbalance, via astrocyte dysregulation, represents a novel mechanism in Alzheimer's disease pathogenesis.
  • The 3D co-culture system effectively models 27-OH-induced astrocyte and synaptic deficits, offering a platform for further research.