Cited by 281Alzheimer's disease research and treatmentsBarrier Structure and Function StudiesCerebrospinal fluid and hydrocephalus

Blood-brain barrier-associated pericytes internalize and clear aggregated amyloid-β42 by LRP1-dependent apolipoprotein E isoform-specific mechanism

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Ma, Qingyi, Zhao, Zhen, Sagare, Abhay P, Wu, Yingxi, Wang, Min, Owens, Nelly Chuqui, Verghese, Philip B, Herz, Joachim +2 more·2018·Molecular Neurodegeneration

Abstract

Abstract Background Clearance at the blood-brain barrier (BBB) plays an important role in removal of Alzheimer’s amyloid-β (Aβ) toxin from brain both in humans and animal models. Apolipoprotein E (apoE), the major genetic risk factor for AD, disrupts Aβ clearance at the BBB. The cellular and molecular mechanisms, however, still remain unclear, particularly whether the BBB-associated brain capillary pericytes can contribute to removal of aggregated Aβ from brain capillaries, and whether removal of Aβ aggregates by pericytes requires apoE, and if so, is Aβ clearance on pericytes apoE isoform-specific. Methods We performed immunostaining for Aβ and pericyte biomarkers on brain capillaries (< 6 μm in diameter) on tissue sections derived from AD patients and age-matched controls, and APPSwe/0 mice and littermate controls. Human Cy3-Aβ42 uptake by pericytes was studied on freshly isolated brain slices from control mice, pericyte LRP1-deficient mice (Lrplox/lox;Cspg4-Cre) and littermate controls. Clearance of aggregated Aβ42 by mouse pericytes was studied on multi-spot glass slides under different experimental conditions including pharmacologic and/or genetic inhibition of the low density lipoprotein receptor related protein 1 (LRP1), an apoE receptor, and/or silencing mouse endogenous Apoe in the presence and absence of human astrocyte-derived lipidated apoE3 or apoE4. Student’s t-test and one-way ANOVA followed by Bonferroni's post-hoc test were used for statistical analysis. Results First, we found that 35% and 60% of brain capillary pericytes accumulate Aβ in AD patients and 8.5-month-old APPSw/0 mice, respectively, compared to negligible uptake in controls. Cy3-Aβ42 species were abundantly taken up by pericytes on cultured mouse brain slices via LRP1, as shown by both pharmacologic and genetic inhibition of LRP1 in pericytes. Mouse pericytes vigorously cleared aggregated Cy3-Aβ42 from multi-spot glass slides via LRP1, which was inhibited by pharmacologic and/or genetic knockdown of mouse endogenous apoE. Human astrocyte-derived lipidated apoE3, but not apoE4, normalized Aβ42 clearance by mouse pericytes with silenced mouse apoE. Conclusions Our data suggest that BBB-associated pericytes clear Aβ aggregates via an LRP1/apoE isoform-specific mechanism. These data support the role of LRP1/apoE interactions on pericytes as a potential therapeutic target for controlling Aβ clearance in AD.

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Authors
Ma, Q., Zhao, Z., Sagare, A. P., Wu, Y., Wang, M., Owens, N. C., Verghese, P. B., Herz, J., Holtzman, D. M., & Zlokovic, B. V.
Affiliations
  • University of Southern California (US)
  • C2N Diagnostics (United States) (US)
  • The University of Texas Southwestern Medical Center (US)
  • Washington University in St. Louis (US)
Venue
Molecular Neurodegeneration
Published
2018-10-19
Volume
13
Issue
1
Pages
57-57
ISSN
1750-1326 (ISSN-L)
OpenAlex
W2897433925
Cited by
281
References
71
Citations by year
2026: 24 · 2025: 54 · 2024: 40 · 2023: 41 · 2022: 35 · 2021: 30 · 2020: 36 · 2019: 21
FWCI
14.91
Type
journal article
Language
en
Open access
Locations
  • Molecular Neurodegeneration (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Digital Commons@Becker (Washington University School of Medicine) (submittedVersion, cc-by)
  • The Scholars Repository - LLU (Loma Linda University) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Institutes of Health (R01NS034467, R01AG023084, R01AG039452)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Cerebrospinal fluid and hydrocephalus
Keywords
blood-brain barrier, amyloid-beta 42, LRP1, apolipoprotein E isoforms, APOE3, APOE ε4, Alzheimer's disease, amyloid-beta clearance, receptor-mediated uptake, pericyte dysfunction, APP overexpression
MeSH terms
Animals, Apolipoproteins E, Biological Transport, Blood-Brain Barrier, Brain, Humans, Mice, Transgenic, Peptide Fragments, Receptors, LDL, Amyloid beta-Peptides, Pericytes, Tumor Suppressor Proteins, Low Density Lipoprotein Receptor-Related Protein-1

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