Cited by 302Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

Evidence That Synaptically Released β-Amyloid Accumulates as Extracellular Deposits in the Hippocampus of Transgenic Mice

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Lazarov, Orly, Lee, Michael, Peterson, Daniel A., Sisodia, Sangram S.·2002·The Journal of Neuroscience

Abstract

A neuropathological hallmark of Alzheimer's disease is the deposition of amyloid-beta (Abeta) peptides in senile plaques in the hippocampus and cerebral cortex. Abeta is derived from larger integral membrane proteins termed amyloid precursor proteins (APP). We demonstrated previously that APP, synthesized by neurons in the entorhinal cortex, is transported via the perforant pathway to presynaptic terminals in the dentate gyrus. We reported that, although full-length APP and membrane-tethered, C-terminal APP derivatives (APP-CTFs) accumulate at terminal fields, the production of Abeta peptides at these sites was indeterminate. To test the hypothesis that APP-CTFs, generated from axonally transported APP, are further metabolized to Abeta peptides that are subsequently released and deposited proximal to nerve terminals, we created unilateral knife lesions of the perforant pathway of transgenic mice that exhibit hippocampal amyloid deposits. We observed pronounced reductions in amyloid burden in the ipsilateral dentate gyrus, findings that lead us to conclude that axonally transported APP gives rise to Abeta peptides that are released from presynaptic sites in the dentate gyrus and deposited in extracellular plaques. Moreover, our findings are consistent with the view that Abeta deposits are dynamic structures and that the perforant path lesion alters the equilibrium between Abeta production-deposition toward clearance as a consequence of blocked axonal transport of APP from the entorhinal cortex to terminal fields in the hippocampus.

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Crossref · 10.1523/jneurosci.22-22-09785.2002

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Authors
Lazarov, O., Lee, M., Peterson, D. A., & Sisodia, S. S.
Affiliations
  • University of Chicago (US)
  • Johns Hopkins University (US)
  • Rosalind Franklin University of Medicine and Science (US)
Venue
The Journal of Neuroscience
Published
2002-11-15
Volume
22
Issue
22
Pages
9785-9793
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1955491145
Cited by
302
References
53
Citations by year
2026: 6 · 2025: 6 · 2024: 4 · 2023: 6 · 2022: 9 · 2021: 10 · 2020: 7 · 2019: 5 · 2018: 8 · 2017: 10 · 2016: 10 · 2015: 14 · 2014: 16 · 2013: 15 · 2012: 13
FWCI
9.99
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ellison Medical Foundation
  • National Institutes of Health
  • National Institute on Aging (AG-20047-02, R01AG021494, AG-021494, R01AG020047)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
amyloid-beta, Alzheimer's disease, amyloid precursor protein, axonal transport, perforant path, dentate gyrus, entorhinal cortex, presynaptic terminals, extracellular amyloid deposition, amyloid plaques, transgenic mice, amyloid-beta clearance
MeSH terms
Alzheimer Disease, Animals, Axonal Transport, Disease Models, Animal, Extracellular Space, Gliosis, Hippocampus, Humans, Mice, Transgenic, Stereotaxic Techniques, Synapses, Amyloid beta-Peptides, Neurites, Amyloid beta-Protein Precursor, Dentate Gyrus, Perforant Pathway, Mice

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