Cited by 159Genetic Neurodegenerative DiseasesNeuroinflammation and Neurodegeneration MechanismsLysosomal Storage Disorders Research

Prion-like transmission of neuronal huntingtin aggregates to phagocytic glia in the Drosophila brain

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Pearce, Margaret M. P., Spartz, Ellen J., Hong, Weizhe, Luo, Liqun, Kopito, Ron R.·2015·Nature Communications

Abstract

The brain has a limited capacity to self-protect against protein aggregate-associated pathology, and mounting evidence supports a role for phagocytic glia in this process. We have established a Drosophila model to investigate the role of phagocytic glia in clearance of neuronal mutant huntingtin (Htt) aggregates associated with Huntington disease. We find that glia regulate steady-state numbers of Htt aggregates expressed in neurons through a clearance mechanism that requires the glial scavenger receptor Draper and downstream phagocytic engulfment machinery. Remarkably, some of these engulfed neuronal Htt aggregates effect prion-like conversion of soluble, wild-type Htt in the glial cytoplasm. We provide genetic evidence that this conversion depends strictly on the Draper signalling pathway, unveiling a previously unanticipated role for phagocytosis in transfer of pathogenic protein aggregates in an intact brain. These results suggest a potential mechanism by which phagocytic glia contribute to both protein aggregate-related neuroprotection and pathogenesis in neurodegenerative disease. Phagocytic glia can internalize protein aggregates in vitro. Here Pearce et al. show in Drosophila that glia clear mutant huntingtin (Htt) aggregates in a scavenger receptor Draper-dependent manner in vivo, and that internalized Htt aggregates induce the prion-like conversion of wild-type Htt expressed in the glial cytoplasm.

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Authors
Pearce, M. M. P., Spartz, E. J., Hong, W., Luo, L., & Kopito, R. R.
Affiliations
  • Stanford University (US)
  • California Institute of Technology (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Kopito, Ron R.
Venue
Nature Communications
Published
2015-04-13
Volume
6
Issue
1
Pages
6768-6768
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2100449855
Cited by
159
References
73
Citations by year
2026: 5 · 2025: 4 · 2024: 12 · 2023: 12 · 2022: 19 · 2021: 17 · 2020: 12 · 2019: 10 · 2018: 17 · 2017: 25 · 2016: 15 · 2015: 11
FWCI
10.52
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Institutes of Health
  • University of Massachusetts Medical School
  • National Institute on Deafness and Other Communication Disorders (R01DC005982)
  • National Institute of Neurological Disorders and Stroke (NS70420, R01NS042842, F32NS070420)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Lysosomal Storage Disorders Research
Keywords
huntingtin aggregates, Huntington's disease, glial phagocytosis, protein aggregate clearance, neurodegeneration, Drosophila brain
MeSH terms
Huntingtin Protein, Red Fluorescent Protein, Animals, Bacterial Proteins, Brain, Disease Models, Animal, Drosophila melanogaster, Gene Expression Regulation, Humans, Huntington Disease, Luminescent Proteins, Membrane Proteins, Microtubule-Associated Proteins, Mutation, Neuroglia, Neurons, Phagocytosis, Prions, Signal Transduction, Genes, Reporter, Disease Progression, Molecular Mimicry, Drosophila Proteins, Protein Aggregation, Pathological, Protein Aggregates

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