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Basic Science and Pathogenesis.

Shuhan Li1

  • 1University of Oxford, Oxford, OXFORD, United Kingdom.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 25, 2025
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Summary
This summary is machine-generated.

Apolipoprotein E (APOE) genotype influences Alzheimer's disease risk. This study found that while astrocyte-conditioned media had minimal impact on neuron genotype, direct astrocyte co-culture significantly altered neuron morphology, indicating astrocytes play a key role in neuron health.

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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Alzheimer's disease (AD) is a neurodegenerative disorder with Apolipoprotein E (APOE) genotype as a major genetic risk factor.
  • Astrocytes, which express APOE, play crucial roles in neuronal function, but the impact of astrocyte-neuron APOE genotype interactions on AD pathogenesis is unclear.
  • This study investigates how isogenic induced pluripotent stem cell (iPSC)-derived astrocytes influence iPSC-derived neurons with different APOE genotypes (APOE3/E3 vs. APOE4/E4).

Purpose of the Study:

  • To determine if astrocyte-conditioned media (ACM) or direct astrocyte co-culture affects neuron phenotype based on their APOE genotype.
  • To identify specific cellular features and pathways mediating neuron-astrocyte interactions in the context of APOE genotype.
  • To elucidate the relative contributions of astrocyte-derived factors versus direct cell contact in modulating neuronal responses.

Main Methods:

  • Generated isogenic iPSC-derived neurons and astrocytes with APOE3/E3 or APOE4/E4 genotypes.
  • Exposed neurons to ACM or co-cultured them with astrocytes, followed by immunocytochemistry to assess morphology and organelle changes.
  • Utilized high-content image analysis and machine learning (ML) for feature extraction, quantification, and genotype classification.

Main Results:

  • ML successfully classified neuron genotypes (E3 vs. E4) based on features from both ACM and co-culture conditions.
  • Neurite length, early endosome (EEA1) intensity/roundness, and synapse protein (SYP) number were key features affected by ACM.
  • Neurons with APOE4/E4 genotype showed increased EEA1 intensity and roundness in response to ACM; direct co-culture highlighted neuronal EEA1 number/size and neuron count as significant features.

Conclusions:

  • Neurons with identical APOE genotypes exhibited greater similarity regardless of the ACM donor genotype, suggesting a neuron-intrinsic effect.
  • Significant differences in neuron response to ACM indicate a potential donor-specific effect requiring further investigation.
  • Direct astrocyte co-culture markedly influenced neuronal morphology, suggesting astrocyte-neuron interactions via cell contact are more impactful than neuron genotype alone.