Cited by 305Complement system in diseasesAlzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration Mechanisms

ApoE attenuates unresolvable inflammation by complex formation with activated C1q

Open access
Yin, Changjun, Ackermann, Susanne, Ma, Zhe, Mohanta, Sarajo K., Zhang, Chuankai, Li, Yuanfang, Nietzsche, Sandor, Westermann, Martin +21 more·2019·Nature Medicine

Abstract

Apolipoprotein-E (ApoE) has been implicated in Alzheimer's disease, atherosclerosis, and other unresolvable inflammatory conditions but a common mechanism of action remains elusive. We found in ApoE-deficient mice that oxidized lipids activated the classical complement cascade (CCC), resulting in leukocyte infiltration of the choroid plexus (ChP). All human ApoE isoforms attenuated CCC activity via high-affinity binding to the activated CCC-initiating C1q protein (K D~140-580 pM) in vitro, and C1q-ApoE complexes emerged as markers for ongoing complement activity of diseased ChPs, Aβ plaques, and atherosclerosis in vivo. C1q-ApoE complexes in human ChPs, Aβ plaques, and arteries correlated with cognitive decline and atherosclerosis, respectively. Treatment with small interfering RNA (siRNA) against C5, which is formed by all complement pathways, attenuated murine ChP inflammation, Aβ-associated microglia accumulation, and atherosclerosis. Thus, ApoE is a direct checkpoint inhibitor of unresolvable inflammation, and reducing C5 attenuates disease burden.

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Crossref · 10.1038/s41591-018-0336-8

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  • BBB breakdown in AD could be related to altered endothelial junctions.

    “It has been reported that BBB breakdown in AD could be related to altered endothelial junctions,[ 22 ]”

    From Multifunctional Nanostructure RAP‐RL Rescues Alzheimer's Cognitive Deficits through Remodeling the Neurovascular Unit (2021) · cites this paper as [22]

    The Results section (‘ChP lipid deposits, inflammation, and interferon signatures’; page unavailable) reports BBB breakdown in ApoE-deficient and ApoE4 mouse models, using perivascular immunoglobulin as a marker. It does not link BBB breakdown in people with AD to altered endothelial junctions; the junctional explanation is unsupported by our copy. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Perivascular Aβ impairs cerebral vessel structure and CBF.

    “Perivascular Aβ impairs the cerebral vessels structure and CBF.[ 22 , 29 ]”

    From Multifunctional Nanostructure RAP‐RL Rescues Alzheimer's Cognitive Deficits through Remodeling the Neurovascular Unit (2021) · cites this paper as [22]

    The Results section on Aβ plaques describes Aβ–ApoE complexes and plaque-associated inflammation, while the BBB assay section describes a measure of barrier integrity; neither links perivascular Aβ to impaired vessel structure. Searches for CBF, cerebral blood flow, and vascular effects of perivascular amyloid found no passage addressing the claimed effect on blood flow. (LLM, conf=0.73)

    Experimental — accuracy not yet measured
  • In neurodegeneration, the complement pathway is activated, and inhibiting C1q or C3 reduces neuroinflammation, Aβ plaques, and synapse loss.

    “In neurodegeneration, the complement pathway is activated, and inhibiting the complement proteins C1q or C3 results in less neuroinflammation, Aβ plaques and synapse loss29,30.”
  • The activation of C1Q can be attenuated by APOE.

    “Interestingly, the activation of C1Q can be attenuated by another molecule of the PIG network, APOE (Yin et al. , 2019).”

    From Spatial Transcriptomics and In Situ Sequencing to Study Alzheimer’s Disease (2020) · cites this paper as Yin et al., 2019

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Research works printed but not linked: 1

  1. [60]Franklin K George P The Mouse Brain in Stereotaxic Coordinates, Compact 3rd Edition 2007

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Authors
Yin, C., Ackermann, S., Ma, Z., Mohanta, S. K., Zhang, C., Li, Y., Nietzsche, S., Westermann, M., Peng, L., Hu, D., Bontha, S. V., Srikakulapu, P., Beer, M., Megens, R. T. A., Steffens, S., Hildner, M., Halder, L. D., Eckstein, H.-H., Pelisek, J., Herms, J., Roeber, S., Arzberger, T., Borodovsky, A., Habenicht, L., Binder, C. J., Weber, C., Zipfel, P. F., Skerka, C., & Habenicht, A. J. R.
Affiliations
  • German Centre for Cardiovascular Research (DE)
  • Leibniz-Institut für Naturstoff-Forschung und Infektionsbiologie e. V. - Hans-Knöll-Institut (HKI) (DE)
  • Institut für Prophylaxe und Epidemiologie der Kreislaufkrankheiten (DE)
  • Jena University Hospital (DE)
  • Wuhan Union Hospital (CN)
  • University of Tennessee Health Science Center (US)
  • University of Virginia (US)
  • Maastricht University (NL)
  • TUM Klinikum (DE)
  • Munich Cluster for Systems Neurology (DE)
  • Institut für Neuropathologie (DE)
  • Alnylam Pharmaceuticals (United States) (US)
  • Austrian Academy of Sciences (AT)
Corresponding author
  • Yin, Changjun
  • Skerka, Christine
Venue
Nature Medicine
Published
2019-01-28
Volume
25
Issue
3
Pages
496-506
ISSN
  • 1078-8956 (ISSN-L)
  • 1546-170X
OpenAlex
W2911553777
Cited by
305
References
64
Citations by year
2026: 36 · 2025: 37 · 2024: 33 · 2023: 41 · 2022: 52 · 2021: 34 · 2020: 47 · 2019: 25
FWCI
16.15
Type
journal article
Language
en
Open access
Locations
  • Nature Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Research Publications (Maastricht University) (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Open access LMU (Ludwid Maxmilian's Universitat Munchen) (submittedVersion)
  • mediaTUM – the media and publications repository of the Technical University Munich (Technical University Munich) (submittedVersion)
  • Research Publications (Maastricht University) (submittedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
apolipoprotein E, C1q, oxidized lipids, amyloid plaques, atherosclerosis, cognitive decline, neuroinflammation, cardiovascular disease, APOE isoforms
MeSH terms
Mice, Knockout, ApoE, Aged, Aged, 80 and over, Animals, Antigen-Antibody Complex, Aorta, Apolipoproteins E, Brain, Carotid Arteries, Carotid Artery Diseases, Choroid Plexus, Complement Pathway, Classical, Complement C5, Female, Humans, Leukocytes, Male, Microscopy, Fluorescence, Middle Aged, Complement C1q, Amyloid beta-Peptides, Protein Isoforms, RNA, Small Interfering, Atherosclerosis, Plaque, Amyloid, Cognitive Dysfunction

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