Cited by 1,281Barrier Structure and Function StudiesAlzheimer's disease research and treatmentsDementia and Cognitive Impairment Research

APOE4 leads to blood–brain barrier dysfunction predicting cognitive decline

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Montagne, Axel, Nation, Daniel A., Sagare, Abhay P., Barisano, Giuseppe, Sweeney, Melanie D., Chakhoyan, Ararat, Pachicano, Maricarmen, Joe, Elizabeth +19 more·2020·Nature

Abstract

Vascular contributions to dementia and Alzheimer's disease are increasingly recognized 1-6. Recent studies have suggested that breakdown of the blood-brain barrier (BBB) is an early biomarker of human cognitive dysfunction 7, including the early clinical stages of Alzheimer's disease 5,8-10. The E4 variant of apolipoprotein E (APOE4), the main susceptibility gene for Alzheimer's disease 11-14, leads to accelerated breakdown of the BBB and degeneration of brain capillary pericytes 15-19, which maintain BBB integrity 20-22. It is unclear, however, whether the cerebrovascular effects of APOE4 contribute to cognitive impairment. Here we show that individuals bearing APOE4 (with the ε3/ε4 or ε4/ε4 alleles) are distinguished from those without APOE4 (ε3/ε3) by breakdown of the BBB in the hippocampus and medial temporal lobe. This finding is apparent in cognitively unimpaired APOE4 carriers and more severe in those with cognitive impairment, but is not related to amyloid-β or tau pathology measured in cerebrospinal fluid or by positron emission tomography 23. High baseline levels of the BBB pericyte injury biomarker soluble PDGFRβ 7,8 in the cerebrospinal fluid predicted future cognitive decline in APOE4 carriers but not in non-carriers, even after controlling for amyloid-β and tau status, and were correlated with increased activity of the BBB-degrading cyclophilin A-matrix metalloproteinase-9 pathway 19 in cerebrospinal fluid. Our findings suggest that breakdown of the BBB contributes to APOE4-associated cognitive decline independently of Alzheimer's disease pathology, and might be a therapeutic target in APOE4 carriers.

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Crossref · 10.1038/s41586-020-2247-3

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  • APOE4 induces cognitive decline independent of Aβ or tau pathology probably through the CypA-MMP9 pathway.

    “APOE4 even induces cognitive decline independent of Aβ or tau pathology probably through CypA-MMP9 pathway.185”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [185]

    The introductory discussion says BBB breakdown contributes to cognitive decline in APOE4 carriers independently of Alzheimer’s pathology, and that APOE4 activates the CypA-MMP9 pathway. It presents the pathway’s role in subsequent dysfunction as a possibility, however; the claim overstates the human findings by saying APOE4 induces cognitive decline as an established causal result. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Compared with wild-type mice, both Apoe knockout mice and mice expressing APOE4 have a leaky BBB, a phenomenon also reported in cognitively unimpaired and mildly impaired individuals who carry an APOEε4 allele.

    “When compared with wild-type mice, both Apoe knockout mice and mice expressing APOE4 have a leaky BBB, a phenomenon also reported in cognitively unimpaired and mildly impaired individuals who carry an APOEε4 allele183–185.”

    From Multifaceted roles of APOE in Alzheimer disease (2024) · cites this paper as [185]

    The Introductory Paragraph reports BBB breakdown in cognitively normal APOE4 carriers, with greater breakdown in carriers with mild cognitive impairment. It mentions APOE knock-in mice and mouse pericytes in connection with a molecular pathway, but does not report the claimed BBB-leak comparison between wild-type, Apoe knockout, and APOE4-expressing mice. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Peripheral APOE seems to influence the brain partly by impacting the BBB.

    “peripheral APOE seems to influence the brain partly by impacting the BBB.”

    From Multifaceted roles of APOE in Alzheimer disease (2024) · cites this paper as [185]

    The Introductory Paragraph reports BBB breakdown in APOE4 carriers and suggests that it contributes to cognitive decline. It does not distinguish peripheral APOE from APOE produced within the brain, so it does not establish that peripheral APOE acts through the BBB. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Breakdown of the blood-brain barrier is an early biomarker of human cognitive decline.

    “Breakdown of the blood-brain barrier (BBB) is an early biomarker of human cognitive decline”

    From ApoE4 reduction: An emerging and promising therapeutic strategy for Alzheimer's disease (2022) · cites this paper as Montagne et al 2020

    The Introductory Paragraph says recent studies have suggested that BBB breakdown is an early biomarker of human cognitive dysfunction. This paper also reports that a BBB pericyte-injury biomarker predicted future cognitive decline, but specifically in APOE4 carriers, not non-carriers. The claim presents the broader biomarker proposition as established rather than suggested. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • APOE4 alters blood-brain barrier integrity, influencing metabolite exchange between the periphery and CNS, including reduced brain glucose and lipid transport.

    “APOE4 alters the integrity of the blood brain barrier (BBB) influencing metabolite exchange between the periphery and the central nervous system (CNS) including reduced brain glucose and lipid transport [17][18][19] .”

    From APOE4-drives brain bioenergetic shifts independent of Alzheimer’s disease pathology (2026) · cites this paper as [19]

    The Introductory Paragraph reports greater blood–brain barrier permeability in APOE4 carriers, supporting the claim that APOE4 alters barrier integrity. It does not establish reduced brain glucose or lipid transport, or measure metabolite exchange between the periphery and CNS; searches for those transport claims found no supporting passage in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

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Research works printed but not linked: 1

  1. [49]Cabeen RP, Laidlaw DH & Toga AW Quantitative imaging toolkit: Software for interactive 3D visualization, data exploration, and computational analysis of neuroimaging datasets. in Proceedings of the International Society for Magnetic Resonance in Medicine (ISMRM) vol. 2854 (2018).

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Authors
Montagne, A., Nation, D. A., Sagare, A. P., Barisano, G., Sweeney, M. D., Chakhoyan, A., Pachicano, M., Joe, E., Nelson, A. R., D’Orazio, L. M., Buennagel, D. P., Harrington, M. G., Benzinger, T. L. S., Fagan, A. M., Ringman, J. M., Schneider, L. S., Morris, J. C., Reiman, E. M., Caselli, R. J., Chui, H. C., TCW, J., Chen, Y., Pa, J., Conti, P. S., Law, M., Toga, A. W., & Zlokovic, B. V.
Affiliations
  • University of Southern California (US)
  • Huntington Medical Research Institutes (US)
  • Washington University in St. Louis (US)
  • Banner Alzheimer’s Institute (US)
  • Mayo Clinic (US)
  • Icahn School of Medicine at Mount Sinai (US)
Venue
Nature
Published
2020-04-29
Volume
581
Issue
7806
Pages
71-76
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W3022539327
Cited by
1,281
References
57
Citations by year
2026: 190 · 2025: 174 · 2024: 196 · 2023: 208 · 2022: 198 · 2021: 218 · 2020: 95 · 2019: 1
FWCI
69.46
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Alzheimer's Association (509279, AARG-17-532905)
  • Eli Lilly and Company
  • Cure Alzheimer's Fund (16 CVD 05)
  • National Institutes of Health (509279, UL1TR002345)
  • Avid Radiopharmaceuticals
  • Charles F. and Joanne Knight Alzheimer Disease Research Center, Washington University in St. Louis (P50 AG0568 1, P01AG03991, P01AG026276)
  • National Institute on Aging (P30-AG-19610, R01AG023084, R01AG039452, R01AG055770, R01AG060049, AARG-17-532905, P50AG016573, K01AG062683, P 50 AG05681, R01AG031581, P50AG005681, P50AG005142, K99AG058780, P30AG019610, P01 AG0 3991, P01AG003991, R00AG058780, R01AG054434, R01AG064228, P01AG052350, P30AG066444, P30AG066530, P01AG026276)
  • National Institute of Neurological Disorders and Stroke (R01NS100459, R01NS090904, R01NS034467)
  • National Institute of Biomedical Imaging and Bioengineering (R01EB009352)
  • National Center for Advancing Translational Sciences
Topics
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
APOE ε4, blood-brain barrier disruption, cognitive decline, Alzheimer's disease, cyclophilin A, MMP-9, cerebrovascular dysfunction, hippocampus, medial temporal lobe, amyloid-beta, tau pathology, cerebrospinal fluid biomarkers, vascular dementia
MeSH terms
Alleles, Alzheimer Disease, Blood-Brain Barrier, Capillaries, Female, Heterozygote, Hippocampus, Humans, Male, Temporal Lobe, Amyloid beta-Peptides, tau Proteins, Pericytes, Parahippocampal Gyrus, Matrix Metalloproteinase 9, Receptor, Platelet-Derived Growth Factor beta, Cyclophilin A, Positron-Emission Tomography, Apolipoprotein E4, Cognitive Dysfunction

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