Alzheimer's & dementia : the journal of the Alzheimer's Association
October 1, 2026 · via Europe PMC
ApoE lipidation state directs immunometabolic reprogramming of human microglia.
Shiferaw TG, Sarkar S, Baker KM, +11 more, Bruce KD.
AI summary — for doctors, generated from the abstract only
Lipid-free and lipid-bound ApoE4 had different effects on human microglia: lipid-bound ApoE4 altered metabolism while lipid-free ApoE4 drove interferon-type inflammation.
What was studied
Laboratory study of human microglia treated with lipid-free or lipid-bound ApoE3 or ApoE4, assessed by live-cell holotomography and global proteomics for lipid droplet dynamics, mitochondrial morphology and phenotype.
Key findings
- ApoE4 produced fewer but enlarged lipid droplets and more mitochondrial fragmentation than ApoE3, enhanced by lipid-bound ApoE4
- Proteomics showed a strong type I interferon response to lipid-free ApoE, exacerbated by lipid-free ApoE4
Clinical relevance
Identifies ApoE lipidation as a possible modifier of ApoE4-related AD risk and a target for future therapies, but it is preclinical.
Who should care
Limitations
In vitro cell work with no patient outcomes and no sample sizes in the abstract; findings may not reflect brain microglia in vivo.
ApoE4 effects on microglia depend on lipidation state, a hypothesis requiring in vivo confirmation.
This is an AI-generated summary of the published abstract, not a clinical recommendation. It may not reflect the full text or subsequent updates — verify against the original source before acting on it.
Abstract
Introduction
ApoE ε4 is the strongest genetic risk factor for Alzheimer's disease (AD). Emerging evidence suggests that ApoE4 increases AD risk by disrupting microglial metabolism and function. However, whether ApoE lipidation state contributes to microglial dysfunction remains poorly understood.
Methods
Human microglia were treated with lipid-free (LF) or lipid-bound ApoE3 or ApoE4. Label-free, live-cell holotomography and global proteomics were used to assess isoform- and lipidation-specific effects on lipid droplet (LD) dynamics, mitochondrial morphology, and microglial phenotype.
Results
ApoE4 treatment resulted in fewer but enlarged LDs and increased mitochondrial fragmentation compared to ApoE3, effects that were enhanced by lipid-bound ApoE4. Proteomic analyses revealed a strong type I interferon response in cells exposed to LF-ApoE, which was exacerbated by LF-ApoE4.
Discussion
These findings indicate that lipid-bound ApoE4 drives metabolic reprogramming, whereas LF-ApoE4 promotes inflammatory signaling, identifying ApoE lipidation as a critical modifier of ApoE4-associated AD risk.
DOI
10.1002/alz.71882
PMID
42860522
Research metadata (titles, abstracts, authors, publication dates) is sourced from Europe PMC, which aggregates content from PubMed/MEDLINE, PubMed Central, and other providers under the U.S. National Library of Medicine (NLM/NCBI). NLM does not claim copyright on abstracts; the original journal publishers or authors may hold rights to the full articles. AI-generated summaries are derived only from the abstract, never the full text, and are always labeled as AI-generated.
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