Cited by 424Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsCholesterol and Lipid Metabolism

Cholesterol and matrisome pathways dysregulated in astrocytes and microglia

Open access
TCW, Julia, Qian, Lu, Pipalia, Nina H., Chao, Michael J., Liang, Shuang A., Shi, Yang, Jain, Bharat R., Bertelsen, Sarah E. +13 more·2022·Cell

Abstract

The impact of apolipoprotein E ε4 (APOE4), the strongest genetic risk factor for Alzheimer's disease (AD), on human brain cellular function remains unclear. Here, we investigated the effects of APOE4 on brain cell types derived from population and isogenic human induced pluripotent stem cells, post-mortem brain, and APOE targeted replacement mice. Population and isogenic models demonstrate that APOE4 local haplotype, rather than a single risk allele, contributes to risk. Global transcriptomic analyses reveal human-specific, APOE4-driven lipid metabolic dysregulation in astrocytes and microglia. APOE4 enhances de novo cholesterol synthesis despite elevated intracellular cholesterol due to lysosomal cholesterol sequestration in astrocytes. Further, matrisome dysregulation is associated with upregulated chemotaxis, glial activation, and lipid biosynthesis in astrocytes co-cultured with neurons, which recapitulates altered astrocyte matrisome signaling in human brain. Thus, APOE4 initiates glia-specific cell and non-cell autonomous dysregulation that may contribute to increased AD risk.

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Crossref · 10.1016/j.cell.2022.05.017

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129 of 129 references verified0 citation errors · 0 not checkable

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  • APOE4 increases cholesterol sequestration in astrocytes leading to changes in the brain matrisome.

    “and increases cholesterol sequestration in astrocytes leading to changes in the brain matrisome11.”

    From APOE4 impairs myelination via cholesterol dysregulation in oligodendrocytes (2022) · cites this paper as [11]

    The Results section, “Matrisome exacerbates lipid dysregulation in APOE4 astrocytes” (page unavailable), states that APOE4 drives lysosomal cholesterol sequestration in astrocytes and that matrisome dysregulation occurs. It does not say sequestration leads to matrisome changes; instead, it links those changes partly to astrocyte–neuron communication and says they worsen lipid dysregulation. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Filipin only stains free (unesterified) cholesterol, and cellular cholesterol accumulation is associated with excess LD.

    “Although filipin only stains free (unesterified) cholesterol, cellular cholesterol accumulation is associated with excess LD10,37,38.”

    From PICALM Alzheimer’s risk allele causes aberrant lipid droplets in microglia (2025) · cites this paper as [38]

    The Results section ('Impaired cholesterol trafficking in APOE4 astrocytes and microglia'; page unavailable) identifies filipin as a measure of intracellular free cholesterol, supporting the first part of the claim. The Discussion mentions lipid-droplet accumulation only while describing another study's finding about choline deficiency and unsaturated fatty acids; it does not establish an association between cellular cholesterol accumulation and excess lipid droplets. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Cholesterol-rich lysosomes and lipid droplets in dysfunctional microglia have been observed in demyelination mouse models and human iPS cell models.

    “Cholesterol-rich lysosomes and LDs in dysfunctional microglia have also been observed in the context of demyelination mouse models and human iPS cell models9–12.”

    From APOE4/4 is linked to damaging lipid droplets in Alzheimer’s disease microglia (2024) · cites this paper as [12]

    The Results (‘Altered lipid metabolism in human APOE4 microglia and astrocytes’; page unavailable) report impaired cholesterol metabolism in human iPSC-derived microglia and predict lysosomal cholesterol accumulation. They do not establish cholesterol-rich lysosomes or lipid droplets in those microglia, or report those observations in demyelination mouse models. The measured increase in lysosomal cholesterol described in ‘Impaired cholesterol trafficking’ was in astrocytes. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • 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 [13]

    The Results sections on altered lipid metabolism and impaired cholesterol trafficking report APOE4-related changes in cholesterol-metabolism gene expression, transporters, and efflux in astrocytes and microglia. They do not establish perturbed cholesterol esterification: the measured increase in astrocyte cholesterol came from free cholesterol, not cholesteryl esters. Page numbers were not available in our copy. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Microglia cholesterol synthesis plays a critical role in promoting normal microglia function.

    “Our work, which suggests a critical role for microglia cholesterol synthesis in promoting normal microglia function, agrees with recently published work in multiple sclerosis and Alzheimer's disease (Berghoff et al., 2021; Tcw et al., 2022).”

    From Sterol dysregulation in Smith–Lemli–Opitz syndrome causes astrocyte immune reactivity through microglia crosstalk (2022) · cites this paper as Tcw et al., 2022

    The Results section on impaired cholesterol trafficking reports altered cholesterol synthesis in APOE4 microglia and reduced myelin uptake, a microglial function. The Discussion also links microglial lipid dysregulation to impaired debris recycling and inflammation. These findings support a connection between cholesterol metabolism and microglial function, but do not establish that cholesterol synthesis itself is critical for promoting normal function. (LLM, conf=0.83)

    Experimental — accuracy not yet measured

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1 of the 130 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Lim ET, Chan Y, Burns MJ, Guo X, Erdin S, Tai DJC, Reichert JM, Chan YK, Chiang JJ, Meyers K, (2020). Identifying cell type specific driver genes in autism-associated copy number loci from cerebral organoids. bioRxiv

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Authors
TCW, J., Qian, L., Pipalia, N. H., Chao, M. J., Liang, S. A., Shi, Y., Jain, B. R., Bertelsen, S. E., Kapoor, M., Marcora, E., Sikora, E., Andrews, E. J., Martini, A. C., Karch, C. M., Head, E., Holtzman, D. M., Zhang, B., Wang, M., Maxfield, F. R., Poon, W. W., & Goate, A. M.
Affiliations
  • Boston University (US)
  • Weill Cornell Medicine (US)
  • Icahn School of Medicine at Mount Sinai (US)
  • University of California, Irvine (US)
  • Washington University in St. Louis (US)
  • Regeneron (United States) (US)
Corresponding author
  • TCW, Julia
  • Goate, Alison M.
Venue
Cell
Publisher
Elsevier BV
Published
2022-06
Volume
185
Issue
13
Pages
2213-2233.e25
ISSN
0092-8674 (ISSN-L)
OpenAlex
W4283360267
Cited by
411
References
130
Citations by year
2026: 93 · 2025: 101 · 2024: 95 · 2023: 79 · 2022: 37 · 2021: 4 · 2019: 1
FWCI
50.10
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • Pfizer
  • National Center for Research Resources (1S10RR025496-01)
  • National Heart, Lung, and Blood Institute (R01HL093324)
  • New York Stem Cell Foundation
  • JPB Foundation (P50AG016573)
  • Cure Alzheimer's Fund (RF1AG054014, U01AG046170, RF1AG057440, RF1AG074010)
  • AbbVie
  • Biogen
  • Eisai
  • National Institutes of Health (RF1AG054014, RF1AG057440, P50AG016573, P30AG066519, RF1AG074010, U01AG046170, K01AG062683, OD 1S10OD010794-01, 1S10OD021718-01)
  • University of California, Irvine (P30AG066519)
  • GlaxoSmithKline
  • National Institute on Aging (U19AG069701, U01AG058635)
  • National Institute of Neurological Disorders and Stroke (RF1AG047644, RF1NS090934)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
APOE ε4, Alzheimer's disease, astrocytes, microglia, cholesterol metabolism, matrisome, lipid metabolism, de novo cholesterol synthesis, glial activation, chemotaxis, transcriptomics, non-cell-autonomous signaling
MeSH terms
Alzheimer Disease, Animals, Apolipoproteins E, Astrocytes, Cholesterol, Humans, Microglia, Mice, Apolipoprotein E3, Apolipoprotein E4, Induced Pluripotent Stem Cells

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