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Basic Science and Pathogenesis.

Siddhi S Joshi1, Josslen Thieschafer1, Ling Li1

  • 1University of Minnesota, Minneapolis, MN, USA.

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|December 24, 2025
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Summary
This summary is machine-generated.

The apolipoprotein E4 (APOE4) gene variant impairs astrocyte mitochondrial function, disrupting energy metabolism and increasing Alzheimer's disease (AD) susceptibility. This APOE4-linked mitochondrial dysfunction exacerbates AD pathology.

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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Apolipoprotein E (APOE) is crucial for brain cholesterol homeostasis and protein clearance.
  • APOE4 is the greatest genetic risk factor for Alzheimer's disease (AD), influencing AD pathology.
  • APOE4's impact on mitochondrial health and bioenergetics in AD remains poorly understood.

Purpose of the Study:

  • To investigate the differential impact of APOE isoforms on mitochondrial function in astrocytes.
  • To determine if APOE4 increases susceptibility to mitochondrial damage in the context of AD.

Main Methods:

  • Utilized cellular models including primary mouse astrocytes and human induced pluripotent stem cell (iPSC)-derived astrocytes from humanized APOE3 and APOE4 models.
  • Treated astrocytes with amyloid-beta (Aβ) aggregates, tau isolates, and cytokines to model AD pathology.
  • Assessed mitochondrial respiration, glycolysis, and mitochondrial membrane potential (MMP) using Seahorse flux analyzers and JC-1 dye.

Main Results:

  • APOE4 astrocytes exhibit disrupted mitochondrial bioenergetics, with impaired respiration and overactivated glycolysis compared to APOE3.
  • APOE4 astrocytes show decreased MMP and a primary reliance on glucose, with an inability to utilize fatty acids for energy.
  • Aggregated Aβ treatment further worsened bioenergetic imbalance and ATP generation in APOE4 astrocytes.

Conclusions:

  • Provided experimental evidence linking APOE4 to mitochondrial dysfunction in astrocytes.
  • Demonstrated that APOE genotype differentially affects mitochondrial health and bioenergetics under AD-related stress.
  • Highlighted the need for in vivo studies to assess the impact of astrocytic APOE4-associated mitochondrial dysfunction on AD pathogenesis.