Cited by 33Neuroinflammation and Neurodegeneration MechanismsPrion Diseases and Protein MisfoldingNeurological Disease Mechanisms and Treatments

Inhibition of IL-34 Unveils Tissue-Selectivity and Is Sufficient to Reduce Microglial Proliferation in a Model of Chronic Neurodegeneration

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Obst, Juliane, Simon, Emilie, Martin-Estebane, Maria, Pipi, Elena, Barkwill, Liana M., Gonzalez-Rivera, Ivette, Buchanan, Fergus, Prescott, Alan R. +10 more·2020·Frontiers in Immunology

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Abstract

The proliferation and activation of microglia, the resident macrophages in the brain, is a hallmark of many neurodegenerative diseases such as Alzheimer's disease (AD) and prion disease. Colony stimulating factor 1 receptor (CSF1R) is critically involved in regulating microglial proliferation, and CSF1R blocking strategies have been recently used to modulate microglia in neurodegenerative diseases. However, CSF1R is broadly expressed by many cell types and the impact of its inhibition on the innate immune system is still unclear. CSF1R can be activated by two independent ligands, CSF-1 and interleukin 34 (IL-34). Recently, it has been reported that microglia development and maintenance depend on IL-34 signaling. In this study, we evaluate the inhibition of IL-34 as a novel strategy to reduce microglial proliferation in the ME7 model of prion disease. Selective inhibition of IL-34 showed no effects on peripheral macrophage populations in healthy mice, avoiding the side effects observed after CSF1R inhibition on the systemic compartment. However, we observed a reduction in microglial proliferation after IL-34 inhibition in prion-diseased mice, indicating that microglia could be more specifically targeted by reducing IL-34. Overall, our results highlight the challenges of targeting the CSF1R/IL34 axis in the systemic and central compartments, important for framing any therapeutic effort to tackle microglia/macrophage numbers during brain disease.

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Authors
Obst, J., Simon, E., Martin-Estebane, M., Pipi, E., Barkwill, L. M., Gonzalez-Rivera, I., Buchanan, F., Prescott, A. R., Faust, D., Fox, S., Brownlees, J., Taylor, D., Perry, V. H., Nuthall, H., Atkinson, P. J., Karran, E., Routledge, C., & Gomez-Nicola, D.
Affiliations
  • Southampton General Hospital (GB)
  • University of Dundee (GB)
  • LifeArc (GB)
  • Eli Lilly (United Kingdom) (GB)
  • Eisai (United Kingdom) (GB)
  • Alzheimer’s Research UK (GB)
Venue
Frontiers in Immunology
Published
2020-10-08
Volume
11
Pages
579000-579000
ISSN
1664-3224 (ISSN-L)
OpenAlex
W3092144067
Cited by
33
References
44
Citations by year
2026: 5 · 2025: 3 · 2024: 5 · 2023: 5 · 2022: 7 · 2021: 5 · 2020: 3
FWCI
1.94
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Immunology (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • ePrints Soton (University of Southampton) (acceptedVersion)
  • Discovery Research Portal (University of Dundee) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • Dementia Consortium
  • Medical Research Council
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Prion Diseases and Protein Misfolding
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
IL-34, microglial proliferation, CSF1R inhibition, prion disease, neurodegeneration, peripheral macrophages, CSF-1, Alzheimer's disease, innate immunity
MeSH terms
Animals, Antibodies, Monoclonal, Brain, Disease Models, Animal, Interleukins, Mice, Inbred C57BL, Mice, Transgenic, Nerve Degeneration, Signal Transduction, Receptors, Granulocyte-Macrophage Colony-Stimulating Factor, Genes, fms, Prion Diseases, Microglia, Cell Line, Tumor, Cell Proliferation, Green Fluorescent Proteins, Antibodies, Neutralizing

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