Cited by 56Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsNeurological Disease Mechanisms and Treatments

Altered processing of amyloid precursor protein in the human neuroblastoma SH-SY5Y by chronic hypoxia

Webster, Nicola J., Green, Kim N., Peers, Chris, Vaughan, Peter F. T.·2002·Journal of Neurochemistry

Abstract

Alzheimer's disease (AD) is more prevalent following an ischemic or hypoxic episode, such as stroke. Indeed, brain levels of amyloid precursor protein (APP) and the cytotoxic amyloid beta peptide (Abeta) fragment are enhanced in these patients and in animal models following experimental ischaemia. We have investigated the effect of chronic hypoxia (CH; 2.5% O2, 24 h) on processing of APP in the human neuroblastoma, SH-SY5Y. We demonstrate that constitutive and muscarinic-receptor-enhanced secretion of the alpha-secretase cleaved fragment of APP, sAPPalpha, was reduced by approximately 60% in CH cells. The caspase inhibitor BOC-D(Ome)FMK did not reverse this effect of CH, and CH cells were as viable as controls, based on MTT assays. Thus, loss of sAPPalpha is not related to cell death or caspase processing of APP. Pre-incubation with antioxidants did not reverse the effect of CH, and the effect could not be mimicked by H2O2, discounting the involvement of reactive oxygen species in hypoxic loss of sAPPalpha. CH did not affect muscarinic activation of extracellular-signal regulated kinase. However, expression of ADAM 10 (widely believed to be alpha-secretase) was decreased approximately 50% following CH. Thus, CH selectively decreases processing of APP by the alpha-secretase pathway, most likely by decreasing levels of ADAM 10.

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Crossref · 10.1046/j.1471-4159.2002.01236.x

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Authors
Webster, N. J., Green, K. N., Peers, C., & Vaughan, P. F. T.
Affiliations
University of Leeds (GB)
Venue
Journal of Neurochemistry
Publisher
Wiley
Published
2002-12
Volume
83
Issue
6
Pages
1262-1271
ISSN
  • 0022-3042 (ISSN-L)
  • 1471-4159
OpenAlex
W1601310757
Cited by
56
References
51
Citations by year
2026: 1 · 2024: 1 · 2023: 1 · 2021: 1 · 2019: 4 · 2018: 2 · 2017: 4 · 2016: 2 · 2015: 3 · 2014: 2 · 2013: 4 · 2012: 3
FWCI
1.60
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
Alzheimer Society
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
amyloid precursor protein, chronic hypoxia, ADAM10, muscarinic receptors, extracellular signal-regulated kinase, reactive oxygen species, Alzheimer's disease, ischemia, SH-SY5Y cells
MeSH terms
Animals, Antioxidants, Cell Survival, Enzyme Inhibitors, Humans, Muscarine, Neuroblastoma, Peptide Fragments, Endopeptidases, Protein Processing, Post-Translational, Tumor Cells, Cultured, Blotting, Western, Cell Hypoxia, Aspartic Acid Endopeptidases, Amyloid beta-Protein Precursor, PC12 Cells, Oxidants, Muscarinic Agonists, Rats, Amyloid Precursor Protein Secretases, Caspase Inhibitors

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