Cited by 87Amyotrophic Lateral Sclerosis ResearchAlzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration Mechanisms

Nucleo-cytoplasmic transport of TDP-43 studied in real time: impaired microglia function leads to axonal spreading of TDP-43 in degenerating motor neurons

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Svahn, Adam J., Don, Emily K., Badrock, Andrew P., Cole, Nicholas J., Graeber, Manuel B., Yerbury, Justin J., Chung, Roger, Morsch, Marco·2018·Acta Neuropathologica

Abstract

Transactivating DNA-binding protein-43 (TDP-43) deposits represent a typical finding in almost all ALS patients, more than half of FTLD patients and patients with several other neurodegenerative disorders. It appears that perturbation of nucleo-cytoplasmic transport is an important event in these conditions but the mechanistic role and the fate of TDP-43 during neuronal degeneration remain elusive. We have developed an experimental system for visualising the perturbed nucleocytoplasmic transport of neuronal TDP-43 at the single-cell level in vivo using zebrafish spinal cord. This approach enabled us to image TDP-43-expressing motor neurons before and after experimental initiation of cell death. We report the formation of mobile TDP-43 deposits within degenerating motor neurons, which are normally phagocytosed by microglia. However, when microglial cells were depleted, injury-induced motor neuron degeneration follows a characteristic process that includes TDP-43 redistribution into the cytoplasm, axon and extracellular space. This is the first demonstration of perturbed TDP-43 nucleocytoplasmic transport in vivo, and suggests that impairment in microglial phagocytosis of dying neurons may contribute towards the formation of pathological TDP-43 presentations in ALS and FTLD.

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  • The activation of microglia by protein aggregates creates a feed-forward vicious cycle that aggravates neurodegeneration as activated microglia contribute to the propagation of tau, Aβ, α-synuclein, and TDP-43 into unaffected brain regions.

    “Ultimately, the activation of microglia by these protein aggregates creates a feed-forward vicious cycle that aggravates neurodegeneration as activated microglia contribute to the propagation of tau, Aβ, α-synuclein, and TDP-43 into unaffected brain regions.159–164”
  • Microglia could phagocytize mobile TDP-43 deposits within degenerating motor neurons.

    “Microglia could phagocytize mobile TDP-43 deposits within degenerating motor neurons.341”
  • Microglia could phagocytize pathological protein deposits such as TDP-43, and interaction of TDP-43 with microglial TREM2 promotes phagocytosis and clearance of TDP-43 by microglia.

    “Overall, microglia could phagocytize pathological protein deposits such as TDP-43, and the interaction of TDP-43 with microglial TREM2 promotes the phagocytosis and clearance of TDP-43 by microglia.”

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Authors
Svahn, A. J., Don, E. K., Badrock, A. P., Cole, N. J., Graeber, M. B., Yerbury, J. J., Chung, R., & Morsch, M.
Affiliations
  • Macquarie University (AU)
  • University of Manchester (GB)
  • The University of Sydney (AU)
  • University of Wollongong (AU)
Corresponding author
  • Chung, Roger
  • Morsch, Marco
Venue
Acta Neuropathologica
Published
2018-06-25
Volume
136
Issue
3
Pages
445-459
ISSN
  • 0001-6322 (ISSN-L)
  • 1432-0533
OpenAlex
W2810948711
Cited by
87
References
74
Citations by year
2026: 5 · 2025: 14 · 2024: 6 · 2023: 14 · 2022: 7 · 2021: 20 · 2020: 9 · 2019: 7 · 2018: 5
FWCI
6.95
Type
journal article
Language
en
Open access
Locations
  • Acta Neuropathologica (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Research Explorer (The University of Manchester) (publishedVersion, cc-by)
  • Research Online (University of Wollongong) (submittedVersion)
  • Figshare (submittedVersion)
Funders
  • Motor Neurone Disease Research Institute of Australia (GI1638, GI1838)
  • Australian Research Council (DP150104472)
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
TDP-43, nuclear transport, microglia, motor neuron degeneration, microglial phagocytosis, neurodegeneration, amyotrophic lateral sclerosis, frontotemporal lobar degeneration, cell death
MeSH terms
Animals, Axons, DNA-Binding Proteins, Motor Neurons, Nerve Degeneration, Zebrafish, Microglia, Protein Transport, Zebrafish Proteins

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