Cited by 198Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsInflammasome and immune disorders

Plaque-associated human microglia accumulate lipid droplets in a chimeric model of Alzheimer’s disease

Open access
Claes, Christel, Danhash, Emma Pascal, Hasselmann, Jonathan, Chadarevian, Jean Paul, Shabestari, Sepideh Kiani, England, Whitney E., Lim, Tau En, Hidalgo, Jorge Luis Silva +3 more·2021·Molecular Neurodegeneration

Abstract

Background: Disease-associated microglia (DAMs), that surround beta-amyloid plaques, represent a transcriptionally-distinct microglial profile in Alzheimer’s disease (AD). Activation of DAMs is dependent on triggering receptor expressed on myeloid cells 2 (TREM2) in mouse models and the AD TREM2-R47H risk variant reduces microglial activation and plaque association in human carriers. Interestingly, TREM2 has also been identified as a microglial lipid-sensor, and recent data indicates lipid droplet accumulation in aged microglia, that is in turn associated with a dysfunctional proinflammatory phenotype. However, whether lipid droplets (LDs) are present in human microglia in AD and how the R47H mutation affects this remains unknown. Methods: To determine the impact of the TREM2 R47H mutation on human microglial function in vivo, we transplanted wild-type and isogenic TREM2-R47H iPSC-derived microglial progenitors into our recently developed chimeric Alzheimer mouse model. At 7 months of age scRNA-seq and histological analyses were performed. Results: Here we report that the transcriptome of human wild-type TREM2 and isogenic TREM2-R47H DAM xenografted microglia (xMGs), isolated from chimeric AD mice, closely resembles that of human atherosclerotic foam cells. In addition, much like foam cells, plaque-bound xMGs are highly enriched in lipid droplets. Somewhat surprisingly and in contrast to a recent in vitro study, TREM2-R47H mutant xMGs exhibit an overall reduction in the accumulation of lipid droplets in vivo. Notably, TREM2-R47H xMGs also show overall reduced reactivity to plaques, including diminished plaque-proximity, reduced CD9 expression, and lower secretion of plaque-associated APOE. Conclusions: Altogether, these results indicate lipid droplet accumulation occurs in human DAM xMGs in AD, but is reduced in TREM2-R47H DAM xMGs, as it occurs secondary to TREM2-mediated changes in plaque proximity and reactivity.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1186/s13024-021-00473-0

Cites

52 of 52 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • TREM2 mutations impair microglial activation and reduce their ability to accumulate lipid droplets in the AD brain.

    “Mutations affecting the TREM2 function impair microglial activation (37) and reduce their ability to accumulate LDs in the AD brain (38).”

    From Reducing microglial lipid load enhances β amyloid phagocytosis in an Alzheimer’s disease mouse model (2025) · cites this paper as [38]

    The Findings section (page unavailable) reports less total lipid-droplet area in TREM2-R47H microglia in chimeric AD mice, but explicitly says this reflects fewer plaque-associated microglia, not a reduced ability to form lipid droplets. It found no significant difference in the proportion of nearby microglia positive for the lipid-droplet marker PLIN2. (LLM, conf=0.89)

    Checked by a reasoning model — may be wrong.

    Experimental — accuracy not yet measured
  • LDAM were also observed in chimaeric human-mouse Alzheimer's disease models.

    “LDAM were also observed in chimaeric human–mouse AD models6.”
  • Human iPSC-derived microglia were enriched in lipid droplets in a chimeric mouse model of AD.

    “human iPSC-derived microglia were enriched in LDs in a chimeric mouse model of AD37”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

1 of the 53 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Claes, C., Danhash, E. P., Hasselmann, J., Chadarevian, J. P., Shabestari, S. K., England, W. E., Lim, T. E., Hidalgo, J. L. S., Spitale, R. C., Davtyan, H., & Blurton-Jones, M.
Affiliations
University of California, Irvine (US)
Corresponding author
  • Claes, Christel
  • Blurton-Jones, Mathew
Venue
Molecular Neurodegeneration
Published
2021-07-23
Volume
16
Issue
1
Pages
50-50
ISSN
1750-1326 (ISSN-L)
OpenAlex
W3184188306
Cited by
197
References
53
Citations by year
2026: 38 · 2025: 44 · 2024: 44 · 2023: 31 · 2022: 38 · 2021: 1
FWCI
11.41
Type
journal article
Language
en
Open access
Locations
  • Molecular Neurodegeneration (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • BrightFocus Foundation (A2020451F)
  • National Institutes of Health (AG048099, AG056303, AG061895)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
Keywords
Alzheimer's disease, disease-associated microglia, lipid droplets, TREM2, amyloid plaques, chimeric mouse model, CD9, apoE secretion, microglial activation, foam cells
MeSH terms
Alzheimer Disease, Animals, Brain, Chimera, Disease Models, Animal, Humans, Membrane Glycoproteins, Receptors, Immunologic, Microglia, Mice, Heterografts, Lipid Droplets

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review