Cited by 15Prion Diseases and Protein MisfoldingNeuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatments

Absence of Apolipoprotein E is associated with exacerbation of prion pathology and promotes microglial neurodegenerative phenotype

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Pankiewicz, Joanna E., Lizińczyk, Anita M., Franco, Leor A., Diaz, Jenny R., Martá-Ariza, Mitchell, Sadowski, Martin J.·2021·Acta Neuropathologica Communications

Abstract

Prion diseases or prionoses are a group of rapidly progressing and invariably fatal neurodegenerative diseases. The pathogenesis of prionoses is associated with self-replication and connectomal spread of PrP Sc, a disease specific conformer of the prion protein. Microglia undergo activation early in the course of prion pathogenesis and exert opposing roles in PrP Sc mediated neurodegeneration. While clearance of PrP Sc and apoptotic neurons have disease-limiting effect, microglia-driven neuroinflammation bears deleterious consequences to neuronal networks. Apolipoprotein (apo) E is a lipid transporting protein with pleiotropic functions, which include controlling of the phagocytic and inflammatory characteristics of activated microglia in neurodegenerative diseases. Despite the significance of microglia in prion pathogenesis, the role of apoE in prionoses has not been established. We showed here that infection of wild type mice with 22L mouse adapted scrapie strain is associated with significant increase in the total brain apoE protein and mRNA levels and also with a conspicuous cell-type shift in the apoE expression. There is reduced expression of apoE in activated astrocytes and marked upregulation of apoE expression by activated microglia. We also showed apoE ablation exaggerates PrP Sc mediated neurodegeneration. Apoe−/− mice have shorter disease incubation period, increased load of spongiform lesion, pronounced neuronal loss, and exaggerated astro and microgliosis. Astrocytes of Apoe−/− mice display salient upregulation of transcriptomic markers defining A1 neurotoxic astrocytes while microglia show upregulation of transcriptomic markers characteristic for microglial neurodegenerative phenotype. There is impaired clearance of PrP Sc and dying neurons by microglia in Apoe−/− mice along with increased level of proinflammatory cytokines. Our work indicates that apoE absence renders clearance of PrP Sc and dying neurons by microglia inefficient, while the excess of neuronal debris promotes microglial neurodegenerative phenotype aggravating the vicious cycle of neuronal death and neuroinflammation.

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Crossref · 10.1186/s40478-021-01261-z

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  • Both ApoE and TREM2 are upregulated in prion disease and affect the expression of pro-inflammatory proteins during the disease course in murine models, but their depletion did not change survival times.

    “Both proteins are upregulated in prion disease and affect the expression of pro-inflammatory proteins during the disease course in murine models. However, their depletion did not change survival times [102,103,104].”

    From Loss of Homeostatic Microglia Signature in Prion Diseases (2022) · cites this paper as [104]

  • The microglia signature in prion diseases differs from that seen in other neurodegenerative diseases.

    “The microglia signature in prion diseases also differs from that seen in other neurodegenerative diseases [104].”

    From Loss of Homeostatic Microglia Signature in Prion Diseases (2022) · cites this paper as [104]

  • Deletion of ApoE might influence the course of prion disease including exacerbation of prion pathology, a dysregulated microglial phenotype, and impaired clearance of PrPSc and dying neurons by microglia.

    “However, the deletion of ApoE might influence the course of prion disease including the exacerbation of prion pathology, a dysregulated microglial phenotype, and impaired clearance of PrPSc and dying neurons by microglia [104].”

    From Loss of Homeostatic Microglia Signature in Prion Diseases (2022) · cites this paper as [104]

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Research works printed but not linked: 3

  1. [31]Franklin KBJ Paxinos G The mouse brain in stereotaxic coordinates, compact 2008 3 Cambridge Academic Press
  2. [63]Sadowski M Kumar A Wisniewski T Bradley WG Prion diseases Neurology in clinical practice 2008 5 Oxford Butterworth-Heinemann 1567 1581
  3. [87]Zilles K Wree A Paxinos G Cortex: areal and laminar structure The rat nervous system 1995 New York Academic Press 649 685

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Authors
Pankiewicz, J. E., Lizińczyk, A. M., Franco, L. A., Diaz, J. R., Martá-Ariza, M., & Sadowski, M. J.
Affiliations
NYU Langone Health (US)
Corresponding author
Sadowski, Martin J.
Venue
Acta Neuropathologica Communications
Published
2021-09-26
Volume
9
Issue
1
Pages
157-157
ISSN
2051-5960 (ISSN-L)
OpenAlex
W3202705426
Cited by
15
References
86
Citations by year
2026: 3 · 2025: 4 · 2024: 2 · 2023: 1 · 2022: 5
FWCI
0.63
Type
journal article
Language
en
Open access
Locations
  • Acta Neuropathologica Communications (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
national institute on aging (R01 AG031221, R01 AG053990, R01 AG067478)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Prion Diseases and Protein Misfolding
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
apolipoprotein E, prion disease, scrapie, PrPSc, microglia, astrocytes, neuroinflammation, inflammatory cytokines, ApoE-deficient mice, neuronal loss
MeSH terms
Animals, Apolipoproteins E, Female, Male, Mice, Inbred C57BL, Nerve Degeneration, Phenotype, Prion Diseases, Microglia, Mice

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