Cited by 177Alzheimer's disease research and treatmentsNeuroscience and Neuropharmacology ResearchNeuroinflammation and Neurodegeneration Mechanisms

Severely dystrophic axons at amyloid plaques remain continuous and connected to viable cell bodies

Adalbert, Robert, Nogradi, Antal, Babetto, Elisabetta, Janeckova, Lucie, Walker, Simon A., Kerschensteiner, Martin, Misgeld, Thomas, Coleman, Michael P.·2009·Brain

Abstract

Synapse loss precedes cell death in Alzheimer's disease, but the timing of axon degeneration relative to these events, and the causal relationships remain unclear. Axons become so severely dystrophic near amyloid plaques that their interruption, causing permanent loss of function, extensive synapse loss, and potentially cell death appears imminent. However, it remains unclear whether axons are truly interrupted at plaques and whether cell bodies fail to support their axons and dendrites. We traced TgCRND8 mouse axons longitudinally through, distal to, and proximal from dystrophic regions. The corresponding neurons not only survived but remained morphologically unaltered, indicating absence of axonal damage signalling or a failure to respond to it. Axons, no matter how dystrophic, remained continuous and initially morphologically normal outside the plaque region, reflecting support by metabolically active cell bodies and continued axonal transport. Immunochemical and ultrastructural studies showed dystrophic axons were tightly associated with disruption of presynaptic transmission machinery, suggesting local functional impairment. Thus, we rule out long-range degeneration axons or dendrites as major contributors to early synapse loss in this model, raising the prospect of a therapeutic window for functional rescue of individual neurons lasting months or even years after their axons become highly dystrophic. We propose that multi-focal pathology has an important role in the human disease in bringing about the switch from local, and potentially recoverable, synapse loss into permanent loss of neuronal processes and eventually their cell bodies.

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Crossref · 10.1093/brain/awn312

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  • Disruption of fast axonal transport results in focal swellings filled with organelles in AD transgenic models, resembling Wallerian degeneration.

    “Another important factor might be the disruption of fast axonal transport, resulting in focal swellings filled with various organelles, as seen in the vicinity but also distant from plaques in several AD transgenic models [27,28,29,30], resembling Wallerian degeneration [31].”
  • CRND8 APP mice reveal reduced synaptic markers and hippocampal neuronal loss at 6 months, when overlaps are first detected with cluster B modules.

    “CRND8 APP mice reveal reduced synaptic markers and hippocampal neuronal loss at 6 months, when overlaps are first detected with cluster B modules (Adalbert et al., 2009; Brautigam et al., 2012).”

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Authors
Adalbert, R., Nogradi, A., Babetto, E., Janeckova, L., Walker, S. A., Kerschensteiner, M., Misgeld, T., & Coleman, M. P.
Affiliations
Babraham Institute (GB)
Venue
Brain
Published
2008-12-05
Volume
132
Issue
2
Pages
402-416
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2161240378
Cited by
177
References
60
Citations by year
2026: 5 · 2025: 6 · 2024: 5 · 2023: 9 · 2022: 15 · 2021: 9 · 2020: 11 · 2019: 10 · 2018: 5 · 2017: 9 · 2016: 16 · 2015: 10 · 2014: 6 · 2013: 12 · 2012: 21
FWCI
6.23
Type
journal article
Language
en
Open access
closed
Locations
  • Brain (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust (069652/Z/02/Z)
  • Biotechnology and Biological Sciences Research Council
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Alzheimer's disease, axonal dystrophy, amyloid plaques, synaptic loss, axonal degeneration, axonal transport, neuronal survival, therapeutic window
MeSH terms
Alzheimer Disease, Animals, Axons, Breeding, Cell Survival, Immunohistochemistry, Male, Mice, Inbred C57BL, Microscopy, Electron, Nerve Degeneration, Synaptic Transmission, Neurons, Models, Animal, Mice, Plaque, Amyloid

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