Cited by 66Alzheimer's disease research and treatmentsRedox biology and oxidative stressDementia and Cognitive Impairment Research

Mild oxidative stress induces redistribution of BACE1 in non-apoptotic conditions and promotes the amyloidogenic processing of Alzheimer's disease amyloid precursor protein

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Tan, Jiang-Li, Li, Qiao-Xin, Ciccotosto, Giuseppe D., Crouch, Peter John, Culvenor, Janetta Gladys, White, Anthony Robert, Evin, Genevieve·2013·PLoS ONE

Abstract

BACE1 is responsible for β-secretase cleavage of the amyloid precursor protein (APP), which represents the first step in the production of amyloid β (Aβ) peptides. Previous reports, by us and others, have indicated that the levels of BACE1 protein and activity are increased in the brain cortex of patients with Alzheimer's disease (AD). The association between oxidative stress (OS) and AD has prompted investigations that support the potentiation of BACE1 expression and enzymatic activity by OS. Here, we have established conditions to analyse the effects of mild, non-lethal OS on BACE1 in primary neuronal cultures, independently from apoptotic mechanisms that were shown to impair BACE1 turnover. Six-hour treatment of mouse primary cortical cells with 10-40 µM hydrogen peroxide did not significantly compromise cell viability but it did produce mild oxidative stress (mOS), as shown by the increased levels of reactive radical species and activation of p38 stress kinase. The endogenous levels of BACE1 mRNA and protein were not significantly altered in these conditions, whereas a toxic H2O2 concentration (100 µM) caused an increase in BACE1 protein levels. Notably, mOS conditions resulted in increased levels of the BACE1 C-terminal cleavage product of APP, β-CTF. Subcellular fractionation techniques showed that mOS caused a major rearrangement of BACE1 localization from light to denser fractions, resulting in an increased distribution of BACE1 in fractions containing APP and markers for trans-Golgi network and early endosomes. Collectively, these data demonstrate that mOS does not modify BACE1 expression but alters BACE1 subcellular compartmentalization to favour the amyloidogenic processing of APP, and thus offer new insight in the early molecular events of AD pathogenesis.

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  1. [56]Chami L, Checler F (2012) BACE1 is at the crossroad of a toxic vicious cycle involving cellular stress and beta-amyloid production in Alzheimer’s disease. Mol Neurodegener 7: 52. 23039869 PMC3507664

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Authors
Tan, J.-L., Li, Q.-X., Ciccotosto, G. D., Crouch, P. J., Culvenor, J. G., White, A. R., & Evin, G.
Affiliations
The University of Melbourne (AU)
Corresponding author
Evin, Genevieve
Venue
PLoS ONE
Published
2013-04-17
Volume
8
Issue
4
Pages
e61246
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2084951515
Cited by
66
References
87
Citations by year
2026: 1 · 2025: 2 · 2023: 3 · 2022: 4 · 2021: 2 · 2020: 3 · 2019: 7 · 2018: 9 · 2017: 4 · 2016: 8 · 2015: 9 · 2014: 11 · 2013: 3
FWCI
7.18
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by)
Funders
National Health and Medical Research Council
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
BACE1, amyloid precursor protein, oxidative stress, Alzheimer's disease, amyloid-beta, hydrogen peroxide, subcellular redistribution, trans-Golgi network, early endosomes, p38 MAPK, beta-secretase, neuronal culture, cortical neurons
MeSH terms
Alzheimer Disease, Amyloid, Animals, Cells, Cultured, Centrifugation, Density Gradient, Cerebral Cortex, Enzyme Activation, Fluorescent Antibody Technique, Hydrogen Peroxide, Mice, Inbred C57BL, Protein Processing, Post-Translational, Subcellular Fractions, Immunoblotting, Aspartic Acid Endopeptidases, Amyloid beta-Protein Precursor, Apoptosis, Oxidative Stress, Protein Transport, Adaptor Proteins, Vesicular Transport, Mice, Caspase 3, Amyloid Precursor Protein Secretases

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