Cited by 1,037Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

APOE and Alzheimer’s disease: Advances in genetics, pathophysiology, and therapeutic approaches

Open access
Serrano-Pozo, Alberto, Das, Sudeshna, Hyman, Bradley T·2021·The Lancet Neurology

Abstract

The APOE ε4 allele remains the strongest genetic risk factor for sporadic Alzheimer's disease and the APOE ε2 allele the strongest genetic protective factor after multiple large scale genome-wide association studies and genome-wide association meta-analyses. However, no therapies directed at APOE are currently available. Although initial studies causally linked APOE with amyloid-β peptide aggregation and clearance, over the past 5 years our understanding of APOE pathogenesis has expanded beyond amyloid-β peptide-centric mechanisms to tau neurofibrillary degeneration, microglia and astrocyte responses, and blood-brain barrier disruption. Because all these pathological processes can potentially contribute to cognitive impairment, it is important to use this new knowledge to develop therapies directed at APOE. Several therapeutic approaches have been successful in mouse models expressing human APOE alleles, including increasing or reducing APOE levels, enhancing its lipidation, blocking the interactions between APOE and amyloid-β peptide, and genetically switching APOE4 to APOE3 or APOE2 isoforms, but translation to human clinical trials has proven challenging.

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Integrity signals

Registry

Crossref · 10.1016/s1474-4422(20)30412-9

Cites

108 of 108 references verified0 citation errors · 0 not checkable

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  • Individuals carrying the APOE ε4 allele display distinct proteo-metabolomic signatures in lipid transport and immune pathways.

    “For example, individuals carrying the APOE ε4 allele display distinct proteo-metabolomic signatures in lipid transport and immune pathways206,207.”

    From Artificial intelligence-driven multi-omics approaches in Alzheimer's disease: Progress, challenges, and future directions (2025) · cites this paper as [206]

    Panel 1 reports APOE4-specific differences in lipid binding and transport, and “Effects on glia” reports proinflammatory changes in APOE4 microglia. However, the paper does not report distinct proteo-metabolomic signatures in individuals carrying ε4; its immune-pathway evidence here concerns gene expression in mouse and stem-cell-derived microglia. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • APOE genotype remains the strongest known risk factor for late-onset Alzheimer's disease.

    “However, apolipoprotein E (APOE) genotype remains the strongest known risk factor. 1”

    From Deletion of neuronal <i>Idol</i> ameliorates Alzheimer's disease–related pathologies via APOE receptors (2025) · cites this paper as [1]

    The Introduction calls the APOE ε4 allele the strongest genetic risk factor for sporadic Alzheimer’s disease. The citing sentence omits “genetic,” so the source does not support calling APOE genotype the strongest known risk factor overall. No page number is available in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Carrying one copy of the APOE ε4 allele increases the risk of developing Alzheimer's disease by about 3 to 7 times.

    “Carrying one copy of this allele increases the risk of developing AD by about 3 to 7 times”

    From Apoe4 and Alzheimer’s Disease Pathogenesis—Mitochondrial Deregulation and Targeted Therapeutic Strategies (2023) · cites this paper as [17]

    Panel 1 (Apolipoprotein E basic facts; page not specified) says that, relative to APOE ε3/ε3, possessing one ε4 allele increases Alzheimer’s disease risk by approximately 3.7 times. That supports an increase of roughly three to four times, but the passage does not give a range extending to seven times for one copy. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • ApoE4 promotes APP-mediated activation of microglia.

    “ApoE4 potentiates inflammatory cascades, modifies microglial phenotype towards a proinflammatory profile and promotes APP-mediated activation of microglia [17]”

    From Apoe4 and Alzheimer’s Disease Pathogenesis—Mitochondrial Deregulation and Targeted Therapeutic Strategies (2023) · cites this paper as [17]

    The ‘Effects on glia’ section reports that APOE4 microglia are primed toward a proinflammatory phenotype and that APOE and TREM2 influence microglial responses to Aβ plaques. It does not establish that APOE4 promotes APP-mediated activation of microglia; it also reports no difference between APOE ε4 carriers and non-carriers in activated microglia per Aβ plaque in the post-mortem sections studied. Page numbers are unavailable in our copy. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • ApoE3 and ApoE2 proteins are less susceptible to proteolytical cleavage than ApoE4 due to their structural properties.

    “To genetically convert ApoE4 into ApoE3 or ApoE2 proteins would be also hypothetically effective in reducing ApoE fragments since their structural properties make these proteins less susceptible to proteolytical cleavage; this would also protect against AD-related phenotypical alterations that have been extensively attributed to ApoE4 [17].”

    From Apoe4 and Alzheimer’s Disease Pathogenesis—Mitochondrial Deregulation and Targeted Therapeutic Strategies (2023) · cites this paper as [17]

    In “Effects on Aβ” (page not provided), the paper says APOE4’s conformation could increase its propensity for enzymatic cleavage relative to APOE3 and APOE2, producing more C-terminal fragments. The citing sentence presents that proposed structural mechanism as an established cause of lower cleavage susceptibility in APOE3 and APOE2. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

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Cites

1 retracted

Flagged first, then by citations

Research works printed but not linked: 3

  1. [9]Tang MX, Stern Y, Marder K, The APOE-epsilon4 allele and the risk of Alzheimer disease among African Americans, whites, and Hispanics. JAMA 1998; 279: 751– 5. 9508150
  2. [15]Serrano-Pozo A, Qian J, Monsell SE, Betensky RA, Hyman BT. APOEε2 is associated with milder clinical and pathological Alzheimer disease. Ann Neurol 2015; 77: 917– 29. 25623662 PMC4447539
  3. [40]Holtzman DM, Fagan AM, Mackey B, Apolipoprotein E facilitates neuritic and cerebrovascular plaque formation in an Alzheimer’s disease model. Ann Neurol 2000; 47: 739– 47. 10852539

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Authors
Serrano-Pozo, A., Das, S., & Hyman, B. T.
Affiliations
Harvard University (US)
Corresponding author
Hyman, Bradley T
Venue
The Lancet Neurology
Publisher
Elsevier BV
Published
2021-01
Volume
20
Issue
1
Pages
68-80
ISSN
1474-4422 (ISSN-L)
OpenAlex
W3111203418
Cited by
1,037
References
108
Citations by year
2026: 199 · 2025: 264 · 2024: 190 · 2023: 179 · 2022: 139 · 2021: 65 · 2012: 1
FWCI
12.25
Type
journal article
Language
en
Update notices
erratum (2021-02-01)
Open access
Locations
  • The Lancet Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion, cc-by-nc-nd)
Funders
  • National Institute of Neurological Disorders and Stroke (U01NS111671\u201301)
  • National Institute on Aging (K08AG064039, 1R01AG047644\u201301)
  • Alzheimer&apos;s Association (AACF-17\u2013524184)
  • Massachusetts General Hospital
  • U.S. Department of Justice
  • Novartis
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
apolipoprotein E, Alzheimer's disease, APOE ε4, APOE ε2, genetic risk factors, amyloid-beta, microglia, astrocytes, blood-brain barrier disruption, mouse model
MeSH terms
Alzheimer Disease, Animals, Apolipoproteins E, Humans, Genetic Therapy

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