Cited by 316Alzheimer's disease research and treatmentsCellular transport and secretionUbiquitin and proteasome pathways

β-Amyloid Accumulation Impairs Multivesicular Body Sorting by Inhibiting the Ubiquitin-Proteasome System

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Almeida, Claudia G., Takahashi, Reisuke H., Gouras, Gunnar K.·2006·The Journal of Neuroscience

Abstract

Increasing evidence links intraneuronal β-amyloid (Aβ 42 ) accumulation with the pathogenesis of Alzheimer’s disease (AD). In Aβ precursor protein (APP) mutant transgenic mice and in human AD brain, progressive intraneuronal accumulation of Aβ 42 occurs especially in multivesicular bodies (MVBs). We hypothesized that this impairs the MVB sorting pathway. We used the trafficking of the epidermal growth factor receptor (EGFR) and TrkB receptor to investigate the MVB sorting pathway in cultured neurons. We report that, during EGF stimulation, APP mutant neurons demonstrated impaired inactivation, degradation, and ubiquitination of EGFR. EGFR degradation is dependent on translocation from MVB outer to inner membranes, which is regulated by the ubiquitin-proteasome system (UPS). We provide evidence that Aβ accumulation in APP mutant neurons inhibits the activities of the proteasome and deubiquitinating enzymes. These data suggest a mechanism whereby Aβ accumulation in neurons impairs the MVB sorting pathway via the UPS in AD.

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Crossref · 10.1523/jneurosci.5078-05.2006

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  • In this model, Aβ accumulates along the endosomal/lysosomal pathway that leads to dysfunction of multivesicular bodies, causing impairment of the ubiquitin-proteasome system, which also controls the fate of NMDARs undergoing endocytic vesicular trafficking.

    “In this model, Ab accumulates along the endosomal/lysomal pathway that leads to dysfunction of multivesicular bodies, causing impairment of the ubiquitin-proteasome system, 9 which also controls the fate of NMDARs undergoing endocytic vesicular trafficking.50”

    From Blocking the Interaction between Apolipoprotein E and Aβ Reduces Intraneuronal Accumulation of Aβ and Inhibits Synaptic Degeneration (2013) · cites this paper as [9]

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  • These cultures are characterized by progressive buildup of intraneuronal Aβ, which is derived from endogenous Aβ escaping exocytosis after cleavage of the APP SW mutant.

    “These cultures are characterized by progressive buildup of intraneuronal Ab, which is derived from endogenous Ab escaping exocytosis after cleavage of the APP SW mutant.9,49”

    From Blocking the Interaction between Apolipoprotein E and Aβ Reduces Intraneuronal Accumulation of Aβ and Inhibits Synaptic Degeneration (2013) · cites this paper as [9]

    The section on Aβ42 localization in cultured APP-mutant neurons reports intracellular Aβ42 staining in neurons carrying the Swedish APP mutation and describes staining for endogenous Aβ42. The Introduction describes APP cleavage as a possible route to Aβ production. Neither passage establishes progressive buildup in these cultures or that the retained Aβ escaped exocytosis. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Intraneuronal Aβ buildup has been associated with disturbed protein trafficking and sorting.

    “A number of studies have associated intraneuronal Ab buildup with hyperphosphorylation of tau protein, 8 disturbed protein trafficking and sorting, 9 reduced expression of synaptic proteins, 10 and mitochondrial dysfunction.11,12”
  • In one study, Aβ-induced abnormalities in MVB endocytic sorting were demonstrated in APP mutant neurons, which appeared to be due to impairment of the ubiquitin proteasome system (UPS).

    “In one study, Aβ-induced abnormalities in MVB endocytic sorting were demonstrated in APP mutant neurons, which appeared to be due to impairment of the ubiquitin proteasome system (UPS; [2]).”
  • Abnormalities in MVB sorting are due to Aβ-dependent alterations in the ubiquitin-proteasome system.

    “The study went on to provide evidence that abnormalities in MVB sorting were due to Aβ-dependent alterations in the ubiquitin-proteasome system (UPS).”

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Authors
Almeida, C. G., Takahashi, R. H., & Gouras, G. K.
Affiliations
Cornell University (US)
Corresponding author
Gouras, Gunnar K.
Venue
The Journal of Neuroscience
Published
2006-04-19
Volume
26
Issue
16
Pages
4277-4288
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2168538246
Cited by
316
References
59
Citations by year
2026: 6 · 2025: 12 · 2024: 11 · 2023: 26 · 2022: 18 · 2021: 12 · 2020: 17 · 2019: 20 · 2018: 14 · 2017: 15 · 2016: 14 · 2015: 15 · 2014: 10 · 2013: 20 · 2012: 18
FWCI
11.52
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Lund University Publications (Lund University) (submittedVersion)
Funders
  • Alzheimer's Association
  • American Health Assistance Foundation
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (R01NS045677, NS 045677)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
amyloid-beta deposition, multivesicular bodies, ubiquitin-proteasome system, Alzheimer's disease, epidermal growth factor receptor, TrkB receptor, receptor degradation, ubiquitination, deubiquitinase, proteasome inhibition
MeSH terms
Animals, Cells, Cultured, Epidermal Growth Factor, Hippocampus, Humans, Male, Mice, Transgenic, Synaptic Vesicles, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, Rats, Sprague-Dawley, Ubiquitin, Proteasome Endopeptidase Complex, Mice, Rats, Proteasome Inhibitors, ErbB Receptors

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