Cited by 82Alzheimer's disease research and treatmentsCellular transport and secretionNeuroscience and Neuropharmacology Research

Inhibition of APP Trafficking by Tau Protein Does Not Increase the Generation of Amyloid‐β Peptides

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Goldsbury, Claire, Mocanu, Maria‐Magdalena, Thies, Edda, Kaether, Christoph, Haass, Christian, Keller, Patrick, Biernat, Jacek, Mandelkow, Eckhard +1 more·2006·Traffic

Abstract

Amyloid‐β, a peptide derived from the precursor protein APP, accumulates in the brain and contributes to the neuropathology of Alzheimer's disease. Increased generation of amyloid‐β might be caused by axonal transport inhibition, via increased dwell time of APP vesicles and thereby higher probability of APP cleavage by secretase enzymes residing on the same vesicles. We tested this hypothesis using a neuronal cell culture model of inhibited axonal transport and by imaging vesicular transport of fluorescently tagged APP and β‐secretase (BACE1). Microtubule‐associated tau protein blocks vesicle traffic by inhibiting the access of motor proteins to the microtubule tracks. In neurons co‐transfected with CFP‐tau, APP‐YFP traffic into distal neurites was strongly reduced. However, this did not increase amyloid‐β levels. In singly transfected axons, APP‐YFP was transported in large tubules and vesicles moving very fast (on average 3 µm/s) and with high fluxes in the anterograde direction (on average 8.4 vesicles/min). By contrast, BACE1‐CFP movement was in smaller tubules and vesicles that were almost 2× slower (on average 1.6 µm/s) with ~18× lower fluxes (on average 0.5 vesicles/min). Two‐colour microscopy of co‐transfected axons confirmed that the two proteins were sorted into distinct carriers. The results do not support the above hypothesis. Instead, they indicate that APP is transported on vesicles distinct from the secretase components and that amyloid‐β is not generated in transit when transport is blocked by tau.

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Authors
Goldsbury, C., Mocanu, M., Thies, E., Kaether, C., Haass, C., Keller, P., Biernat, J., Mandelkow, E., & Mandelkow, E.
Affiliations
  • Deutsches Elektronen-Synchrotron DESY (DE)
  • Leibniz Institute on Aging - Fritz Lipmann Institute (FLI) (DE)
  • Adolf-Butenandt-Institut für Physiologische Chemie, Physikalische Biochemie und Zellbiologie (DE)
  • Meso Scale Discovery (United States) (US)
Corresponding author
  • Goldsbury, Claire
  • Mandelkow, Eva‐Maria
Venue
Traffic
Publisher
Wiley
Published
2006-05-31
Volume
7
Issue
7
Pages
873-888
ISSN
  • 1398-9219 (ISSN-L)
  • 1600-0854
OpenAlex
W1540823632
Cited by
82
References
56
Citations by year
2024: 1 · 2022: 2 · 2021: 4 · 2020: 1 · 2019: 2 · 2018: 5 · 2017: 2 · 2016: 3 · 2015: 5 · 2014: 7 · 2013: 4 · 2012: 8
FWCI
5.52
Type
journal article
Language
en
Open access
Locations
  • Traffic (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft
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 › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
amyloid-beta production, APP trafficking, tau protein, BACE1, beta-secretase, vesicle trafficking, Alzheimer's disease, APP cleavage, microtubule-associated proteins
MeSH terms
Animals, Cells, Cultured, Chlorocebus aethiops, Cerebral Cortex, Gene Expression Regulation, Humans, Neurons, Peptide Fragments, Recombinant Proteins, Retinal Ganglion Cells, Amyloid beta-Peptides, tau Proteins, Rats, Wistar, Protein Transport, Rats

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