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51/100

✓ Peer-reviewed alzhub usefulness score 51 out of 100. TREM2 and immune genetics

Topic: Brain proteins, microglia and lab models

Plain-language summary

APOE and Trem2 are major genetic risk factors for Alzheimer's disease (AD), but how they affect microglia response to Aβ remains unclear. Here we report an APOE isoform-specific phospholipid signature with correlation between human APOEε3/3 and APOEε4/4 AD brain and lipoproteins from astrocyte conditioned media of APOE3 and APOE4 mice. Using preclinical AD mouse models, we show that APOE3 lipoproteins, unlike APOE4, induce faster microglial migration towards injected Aβ, facilitate Aβ uptake, and ameliorate Aβ effects on cognition.

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APA 7th

Fitz, N. F., Nam, K. N., Wolfe, C. M., Letronne, F., Playso, B. E., Iordanova, B. E., et al. (2021). Phospholipids of APOE lipoproteins activate microglia in an isoform-specific manner in preclinical models of Alzheimer's disease. Nature communications. https://doi.org/10.1038/s41467-021-23762-0

Vancouver

Fitz NF, Nam KN, Wolfe CM, Letronne F, Playso BE, Iordanova BE, et al. Phospholipids of APOE lipoproteins activate microglia in an isoform-specific manner in preclinical models of Alzheimer's disease. Nature communications. 2021. doi:10.1038/s41467-021-23762-0. PMID: 34099706.

BibTeX

@article{fitz2021-34099706,
  author  = {Fitz, N. F. and Nam, K. N. and Wolfe, C. M. and Letronne, F. and Playso, B. E. and Iordanova, B. E. and Kozai, T. D. Y. and Biedrzycki, R. J. and others},
  title   = {{Phospholipids of APOE lipoproteins activate microglia in an isoform-specific manner in preclinical models of Alzheimer's disease}},
  journal = {Nature communications},
  year    = {2021},
  doi     = {10.1038/s41467-021-23762-0},
  pmid    = {34099706},
  url     = {https://doi.org/10.1038/s41467-021-23762-0}
}

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How to read this study

Design: our record does not state a study design, so check the methods section of the original before weighing the result.
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Effect: the record gives no effect size, so the summary above cannot say how large any difference was.

What the evidence grade means here

This page is graded low. alzhub.org assigns the grade automatically from keywords in the abstract, not from reading the paper. Low means the abstract matched neither pattern. It is the default label, and it does not mean the work is poor; many sound lab and imaging papers land here. It can add at most 5 of the 100 points in the study score, and it is a label about design, not a verdict on whether the findings are true.

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Key findings

Here we report an APOE isoform-specific phospholipid signature with correlation between human APOEε3/3 and APOEε4/4 AD brain and lipoproteins from astrocyte conditioned media of APOE3 and APOE4 mice.
Using preclinical AD mouse models, we show that APOE3 lipoproteins, unlike APOE4, induce faster microglial migration towards injected Aβ, facilitate Aβ uptake, and ameliorate Aβ effects on cognition.
Bulk and single-cell RNA-seq demonstrate that, compared to APOE4, cortical infusion of APOE3 lipoproteins upregulates a higher proportion of genes linked to an activated microglia response, and this trend is augmented by TREM2 deficiency.
In vitro, lack of TREM2 decreases Aβ uptake by APOE4-treated microglia only, suggesting TREM2-APOE interaction.

Why it matters

In preclinical mouse models, APOE3 lipoproteins helped microglia migrate toward and take up amyloid-beta and improved cognition, unlike APOE4. This is animal research and does not establish a treatment for people.

New to this subject? Start with our plain-English guide: Genetics →

Study details

Evidence strengthLow

How this study scored 51/100

Published in a leading specialty journal. Scored zero for study design, sample size, effect reported, studied in people and randomized / blinded because the record does not state it.

Component	Points	Why
Journal tier	9 / 10	Tier 2 — leading specialty journal (Nature communications)
Journal's citation record	4 / 4	Nature Communications: journal h-index 747 (OpenAlex, 2026-10-29)
Study design	0 / 12	No study design recorded — scores zero, not guessed (not stated in the record — scored 0)
Strength of evidence	1 / 5	Rated “low” in our summary
Peer-review validation	10 / 10	Peer-reviewed. Published as an article in a named peer-reviewed journal.
How recent	3 / 5	2021 — within 6 year(s) of the newest study here
Sample size	0 / 4	Participant count not stated — scores zero (not stated in the record — scored 0)
Effect reported	0 / 3	No effect size reported — scores zero (not stated in the record — scored 0)
Studied in people	0 / 3	Not stated whether this was studied in people — scores zero (not stated in the record — scored 0)
Randomized / blinded	0 / 2	No randomization or blinding stated — scores zero (not stated in the record — scored 0)
Times cited	5 / 7	Cited 129 times (OpenAlex, 2026-10-10)
Citations per year	3 / 5	18.4 citations a year over 7 year(s) since 2021
Impact for its field and year	3 / 6	Cited 6.4× the average for papers of its field and year (OpenAlex FWCI)
Cited by studies here	3 / 6	Cited by 13 other studies in this library
Still being cited	3 / 4	Cited 79 times in 2024–2026 (2026 still in progress; OpenAlex)
Senior author's track record	2 / 4	Last-listed author Radosveta P. Koldamova: h-index 34 (OpenAlex, whole career)
Institution's track record	1 / 3	University of Pittsburgh: institution h-index 1,470 (OpenAlex)
Multicenter collaboration	0 / 3	OpenAlex lists 1 institution(s) in 1 country — scores zero (affiliation lists can be incomplete)
Indexed in PubMed	2 / 2	Indexed in PubMed (PMID 34099706)
Free to read	2 / 2	Free to read
Total	51 / 100	—

What each of these 20 components measures, and what this score is not →

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