Cited by 1,125Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

APOE4 Causes Widespread Molecular and Cellular Alterations Associated with Alzheimer’s Disease Phenotypes in Human iPSC-Derived Brain Cell Types

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Lin, Yuan-Ta, Seo, Jinsoo, Gao, Fan, Feldman, Heather M., Wen, Hsin-Lan, Penney, Jay, Cam, Hugh P., Gjoneska, Elizabeta +13 more·2018·Neuron

Abstract

The apolipoprotein E4 (APOE4) variant is the single greatest genetic risk factor for sporadic Alzheimer's disease (sAD). However, the cell-type-specific functions of APOE4 in relation to AD pathology remain understudied. Here, we utilize CRISPR/Cas9 and induced pluripotent stem cells (iPSCs) to examine APOE4 effects on human brain cell types. Transcriptional profiling identified hundreds of differentially expressed genes in each cell type, with the most affected involving synaptic function (neurons), lipid metabolism (astrocytes), and immune response (microglia-like cells). APOE4 neurons exhibited increased synapse number and elevated Aβ 42 secretion relative to isogenic APOE3 cells while APOE4 astrocytes displayed impaired Aβ uptake and cholesterol accumulation. Notably, APOE4 microglia-like cells exhibited altered morphologies, which correlated with reduced Aβ phagocytosis. Consistently, converting APOE4 to APOE3 in brain cell types from sAD iPSCs was sufficient to attenuate multiple AD-related pathologies. Our study establishes a reference for human cell-type-specific changes associated with the APOE4 variant. VIDEO ABSTRACT.

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Crossref · 10.1016/j.neuron.2018.05.008

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  • iPSC-derived neurons from LOAD patients expressing ApoE4 secrete higher levels of Aβ compared to ApoE3-expressing neurons.

    “induced pluripotent stem cells (iPSC)-derived neurons from LOAD patients expressing ApoE4 secrete higher levels of Aβ, when compared to ApoE3-expressing neurons”

    From Apoe4 and Alzheimer’s Disease Pathogenesis—Mitochondrial Deregulation and Targeted Therapeutic Strategies (2023) · cites this paper as [39]

    The Results section on sAD patient-derived iPSCs reports no significant difference in secreted Aβ42 or Aβ40 between APOE4 neurons and their APOE3-edited counterparts (page unavailable). The reported 20% increase in Aβ42 came from a separate comparison using isogenic lines generated from unaffected parental cells, not the patient-derived neurons specified in the claim. (LLM, conf=0.90)

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  • APOE4 reduces the phagocytosis ability of glial cells, enhances microglia proinflammatory activation by Aβ plaques or tau aggregates, and promotes neurodegeneration in mouse models.

    “In addition, APOE4 was found to reduce the phagocytosis ability of glial cells, enhance microglia proinflammatory activation by Aβ plaques or tau aggregates and promote neurodegeneration in the mouse models.176,177”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [177]

    The Results section ('APOE4 microglia-like cells exhibit inflammatory gene activation and less efficient Aβ42 uptake'; page unavailable) reports slower Aβ42 uptake by APOE4 microglia-like cells and up-regulation of immune-response genes. The Discussion ('APOE4 effects on astrocytes'; page unavailable) also reports less efficient Aβ uptake by APOE4 astrocytes. These passages do not establish that plaques or tau aggregates trigger proinflammatory activation, or that this study found neurodegeneration in mouse models; its experiments used human iPSC-derived cells and organoids. (LLM, conf=0.87)

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  • In vitro editing of ε4 to ε3 or ε2 simultaneously corrects several phenotypes, including glial transcriptomic profiles, lipid metabolism and other functional measures.

    “Studies that have successfully targeted APOE using gene editing in induced pluripotent stem cells (iPSCs) provide strong proof of concept that in vitro editing of ε4 to ε3 or ε2 simultaneously ‘corrects’ several phenotypes, including glial transcriptomic profiles, lipid metabolism and other functional measures7,8.”

    From APOE4 to APOE2 allelic switching in mice improves Alzheimer’s disease-related metabolic signatures, neuropathology and cognition (2025) · cites this paper as [8]

    The Results section, “Converting APOE4 to APOE3,” reports that editing patient-derived iPSCs reduced astrocyte cholesterol accumulation and improved several neuronal and glial functional measures. It does not report an ε4-to-ε2 edit or show that the ε4-to-ε3 edit corrected glial transcriptomic profiles; the Discussion says APOE2’s effects warrant further study. Page numbers are unavailable in our copy. (LLM, conf=0.88)

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  • In disease models, ApoE4 perturbs cholesterol regulation, including expression of cholesterol metabolism-related genes, cholesterol transport and esterification.

    “In disease models, ApoE4 perturbs cholesterol regulation, including expression of cholesterol metabolism-related genes, cholesterol transport and esterification10–13.”

    From Decreased lipidated ApoE‐receptor interactions confer protection against pathogenicity of ApoE and its lipid cargoes in lysosomes (2025) · cites this paper as [11]

    The Discussion (‘APOE4 effects on astrocytes’; page not supplied) reports altered expression of lipid-metabolism and transport genes and cholesterol accumulation in APOE4 astrocyte cultures. The Results (‘APOE4 astrocytes exhibit compromised Aβ uptake’; page not supplied) also report altered lipid-transport gene expression and cholesterol levels. Our copy does not report an effect on cholesterol esterification, so that specific part of the claim is unsupported. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Neuronal APOE4 is associated with altered synaptic function, fatty acid accumulation and hyperexcitability in hiPSC-derived neurons.

    “The characterization of hIPSC-derived neurons indicates that neuronal APOE4 is associated with altered synaptic function, fatty acid accumulation and hyperexcitability143.”

    From Multifaceted roles of APOE in Alzheimer disease (2024) · cites this paper as [143]

    The Results section, “Increased synapses, early endosomes and Aβ42 secretion in APOE4 neurons” (page unavailable), reports increased synapse number and excitatory postsynaptic current frequency in iPSC-derived APOE4 neurons, supporting altered synaptic function and increased synaptic activity. It does not establish neuronal hyperexcitability as such. The paper reports cholesterol accumulation in APOE4 astrocytes, not fatty acid accumulation in neurons. (LLM, conf=0.88)

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Authors
Lin, Y.-T., Seo, J., Gao, F., Feldman, H. M., Wen, H.-L., Penney, J., Cam, H. P., Gjoneska, E., Raja, W. K., Cheng, J., Rueda, R., Kritskiy, O., Abdurrob, F., Peng, Z., Milo, B., Yu, C. J., Elmsaouri, S., Dey, D., Ko, T., Yankner, B. A., & Tsai, L.-H.
Affiliations
  • Massachusetts Institute of Technology (US)
  • Harvard University (US)
Corresponding author
Tsai, Li-Huei
Venue
Neuron
Publisher
Elsevier BV
Published
2018-06
Volume
98
Issue
6
Pages
1141-1154.e7
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2805798400
Cited by
1,125
References
74
Citations by year
2026: 94 · 2025: 152 · 2024: 175 · 2023: 167 · 2022: 159 · 2021: 151 · 2020: 142 · 2019: 66 · 2018: 18
FWCI
64.81
Type
journal article
Language
en
Update notices
erratum (2018-06-27)
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-nd)
  • IslandScholar (University of Prince Edward Island) (submittedVersion)
Funders
  • Basic Science Research Program (2014R1A6A3A03055359)
  • NIH (RF1 AG048056, RC1 AG036106, RF1 AG048029)
  • Glenn Foundation for Medical Research
  • Robert A. and Renee E. Belfer Family Foundation
  • Cure Alzheimer's Fund
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
APOE ε4, sporadic Alzheimer's disease, induced pluripotent stem cells, APOE3, neurons, astrocytes, microglia-like cells, amyloid-beta, synaptic function, lipid metabolism, cholesterol accumulation, cell type-specific gene expression, CRISPR/Cas9 genome editing
MeSH terms
Alzheimer Disease, Astrocytes, Brain, Cell Differentiation, Humans, Synaptic Transmission, Neuroglia, Neurons, Organoids, Peptide Fragments, Phosphoproteins, Amyloid beta-Peptides, tau Proteins, Microglia, Lipid Metabolism, Apolipoprotein E3, Apolipoprotein E4, Induced Pluripotent Stem Cells, Transcriptome, CRISPR-Cas Systems

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