Cited by 151Prion Diseases and Protein MisfoldingNeuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatments

Complement 3(+)-astrocytes are highly abundant in prion diseases, but their abolishment led to an accelerated disease course and early dysregulation of microglia

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Hartmann, Kristin, Sepulveda-Falla, Diego, Rose, Indigo V. L., Madore, Charlotte, Muth, Christiane, Matschke, Jakob, Butovsky, Oleg, Liddelow, Shane +2 more·2019·Acta Neuropathologica Communications

Abstract

Astrogliosis and activation of microglia are hallmarks of prion diseases in humans and animals. Both were viewed to be rather independent events in disease pathophysiology, with proinflammatory microglia considered to be the potential neurotoxic species at late disease stages. Recent investigations have provided substantial evidence that a proinflammatory microglial cytokine cocktail containing TNF-α, IL-1α and C1qa reprograms a subset of astrocytes to change their expression profile and phenotype, thus becoming neurotoxic (designated as A1-astrocytes). Knockout or antibody blockage of the three cytokines abolish formation of A1-astrocytes, therefore, this pathway is of high therapeutic interest in neurodegenerative diseases. Since astrocyte polarization profiles have never been investigated in prion diseases, we performed several analyses and could show that C3 + -PrP Sc -reactive-astrocytes, which may represent a subtype of A1-astrocytes, are highly abundant in prion disease mouse models and human prion diseases. To investigate their impact on prion disease pathophysiology and to evaluate their potential therapeutic targeting, we infected TNF-α, IL-1α, and C1qa Triple-KO mice (TKO-mice), which do not transit astrocytes into A1, with prions. Although formation of C3 + -astrocytes was significantly reduced in prion infected Triple-KO-mice, this did not affect the amount of PrP Sc deposition or titers of infectious prions. Detailed characterization of the astrocyte activation signature in thalamus tissue showed that astrocytes in prion diseases are highly activated, showing a mixed phenotype that is distinct from other neurodegenerative diseases and were therefore termed C3 + -PrP Sc -reactive-astrocytes. Unexpectedly, Triple-KO led to a significant acceleration of prion disease course. While pan-astrocyte and -microglia marker upregulation was unchanged compared to WT-brains, microglial homeostatic markers were lost early in disease in TKO-mice, pointing towards important functions of different glia cell types in prion diseases.

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  • Several proinflammatory cytokines, including TNF α, IL 1α, and C1qa, are upregulated in the brain during the prion disease course.

    “Several proinflammatory cytokines are upregulated in the brain during the prion disease course including TNF α, IL 1α, and C1qa [46,69,70,71,72,73].”

    From Loss of Homeostatic Microglia Signature in Prion Diseases (2022) · cites this paper as [73]

  • Microglia and astrocytes keep close contacts in the healthy brain but also in terminal prion disease, although both cell types are considerably dysregulated.

    “Microglia and astrocytes keep close contacts in the healthy brain but also in terminal prion disease, although both cell types are considerably dysregulated (Figure 5B) [73].”

    From Loss of Homeostatic Microglia Signature in Prion Diseases (2022) · cites this paper as [73]

  • Astrocytes in murine and human prion diseases express the A1-signature proteins complement 3 and GBP2.

    “We recently showed that astrocytes in murine and human prion diseases express the A1-signature proteins complement 3 and GBP2 [73].”

    From Loss of Homeostatic Microglia Signature in Prion Diseases (2022) · cites this paper as [73]

  • TMEM119-positive processes are highly reduced at the terminal stage of prion disease in the hippocampus, and almost completely lost in the thalamus.

    “As previously shown, TMEM119-positive processes are highly reduced at the terminal stage of prion disease in the hippocampus, and almost completely lost in the thalamus during terminal prion disease (Figure 5) [73].”

    From Loss of Homeostatic Microglia Signature in Prion Diseases (2022) · cites this paper as [73]

  • The loss of homeostatic microglial proteins is visible in immunofluorescence double-staining of IBA1 and TMEM119 in terminally sick mice and mock-infected healthy control brains, and shows reciprocal regulation of both proteins in prion disease.

    “The loss of homeostatic microglial proteins is visible in immunofluorescence double-staining of IBA1 and TMEM119 in terminally sick mice and mock-infected healthy control brains, and shows the reciprocal regulation of both proteins in prion disease (Figure 5A) [55,73,88,89,90,91].”

    From Loss of Homeostatic Microglia Signature in Prion Diseases (2022) · cites this paper as [73]

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Authors
Hartmann, K., Sepulveda-Falla, D., Rose, I. V. L., Madore, C., Muth, C., Matschke, J., Butovsky, O., Liddelow, S., Glatzel, M., & Krasemann, S.
Affiliations
  • University Medical Center Hamburg-Eppendorf (DE)
  • NYU Langone Health (US)
  • Brigham and Women's Hospital (US)
  • The University of Melbourne (AU)
Corresponding author
Krasemann, Susanne
Venue
Acta Neuropathologica Communications
Published
2019-05-22
Volume
7
Issue
1
Pages
83-83
ISSN
2051-5960 (ISSN-L)
OpenAlex
W2947673562
Cited by
141
References
66
Citations by year
2026: 9 · 2025: 17 · 2024: 25 · 2023: 20 · 2022: 18 · 2021: 25 · 2020: 24 · 2019: 3
FWCI
5.79
Type
journal article
Language
en
Open access
Locations
  • Acta Neuropathologica Communications (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by)
Funders
Werner Otto Stiftung (9/91)
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
prion disease, A1 astrocytes, astrocyte polarization, microglial activation, TNF-α, IL-1α, C1QA, triple knockout mice, prion pathogenesis, neuroinflammation, glial interactions, thalamus, neurodegeneration
MeSH terms
Aged, Animals, Astrocytes, Complement C3, Female, Humans, Creutzfeldt-Jakob Syndrome, Male, Mice, Inbred C57BL, Middle Aged, Cytokines, Prion Diseases, Microglia, Mice, Knockout, Disease Progression, PrPSc Proteins

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