Cited by 14Prion Diseases and Protein MisfoldingNeuroinflammation and Neurodegeneration MechanismsPhagocytosis and Immune Regulation

Prion pathogenesis is unaltered in the absence of SIRPα-mediated "don't-eat-me" signaling

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Nuvolone, Mario, Paolucci, Marta, Sorce, Silvia, Kana, Veronika, Moos, Rita, Matozaki, Takashi, Aguzzi, Adriano·2017·PLOS ONE

Abstract

Prion diseases are neurodegenerative conditions caused by misfolding of the prion protein, leading to conspicuous neuronal loss and intense microgliosis. Recent experimental evidence point towards a protective role of microglia against prion-induced neurodegeneration, possibly through elimination of prion-containing apoptotic bodies. The molecular mechanisms by which microglia recognize and eliminate apoptotic cells in the context of prion diseases are poorly defined. Here we investigated the possible involvement of signal regulatory protein α (SIRPα), a key modulator of host cell phagocytosis; SIRPα is encoded by the Sirpa gene that is genetically linked to the prion gene Prnp. We found that Sirpa transcripts are highly enriched in microglia cells within the brain. However, Sirpa mRNA levels were essentially unaltered during the course of experimental prion disease despite upregulation of other microglia-enriched transcripts. To study the involvement of SIRPα in prion pathogenesis in vivo, mice expressing a truncated SIRPα protein unable to inhibit phagocytosis were inoculated with rodent-adapted scrapie prions of the 22L strain. Homozygous and heterozygous Sirpa mutants and wild-type mice experienced similar incubation times after inoculation with either of two doses of 22L prions. Moreover, the extent of neuronal loss, microgliosis and abnormal prion protein accumulation was not significantly affected by Sirpa genotypes. Collectively, these data indicate that SIRPα-mediated phagocytosis is not a major determinant in prion disease pathogenesis. It will be important to search for additional candidates mediating prion phagocytosis, as this mechanism may represent an important target of antiprion therapies.

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Crossref · 10.1371/journal.pone.0177876

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  • Neither the 'eat me'-protein developmental endothelial locus-1 nor the 'don't eat me'-receptor signal regulatory protein SIRPa, nor the macrophage scavenger receptor 1 (Msr1) influence the prion disease course, since their depletion had no effect on disease pathophysiology.

    “However, neither the “eat me”-protein developmental endothelial locus-1 nor the “don’t eat me”-receptor signal regulatory protein SIRPa, nor the macrophage scavenger receptor 1 (Msr1) influence the prion disease course, since their depletion had no effect on disease pathophysiology [85,86,87].”

    From Loss of Homeostatic Microglia Signature in Prion Diseases (2022) · cites this paper as [85]

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Authors
Nuvolone, M., Paolucci, M., Sorce, S., Kana, V., Moos, R., Matozaki, T., & Aguzzi, A.
Affiliations
  • University of Pavia (IT)
  • University Hospital Zurich (CH)
  • Kobe University (JP)
Corresponding author
  • Nuvolone, Mario
  • Aguzzi, Adriano
Venue
PLOS ONE
Published
2017-05-17
Volume
12
Issue
5
Pages
e0177876
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2616831870
Cited by
13
References
59
Citations by year
2025: 2 · 2024: 1 · 2023: 2 · 2022: 5 · 2021: 1 · 2020: 1 · 2017: 1
FWCI
0.22
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Institutional Repositories DataBase (IRDB) (publishedVersion, cc-by)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, cc-by)
  • Kobe University Repository Kernel (Kobe University) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, cc-by)
  • Zurich Open Repository and Archive (University of Zurich)
Funders
  • European Commission
  • SystemsX.ch
  • Japan Society for the Promotion of Science (16K15219)
  • FP7 Ideas: European Research Council (250356)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Prion Diseases and Protein Misfolding
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
prion disease, SIRPα, microglia, phagocytosis, prion pathogenesis, scrapie, microglial activation, neuronal loss, apoptotic bodies
MeSH terms
Prion Proteins, Animals, Gene Expression Regulation, Mutation, Phagocytosis, Receptors, Immunologic, Prion Diseases, Microglia, Disease Progression, Mice

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