Cited by 177Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsLysosomal Storage Disorders Research

Apolipoprotein E4 Potentiates Amyloid β Peptide-induced Lysosomal Leakage and Apoptosis in Neuronal Cells

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Ji, Zhong-Sheng, Miranda, R. Dennis, Newhouse, Yvonne M., Weisgraber, Karl H., Huang, Yadong, Mahley, Robert W.·2002·Journal of Biological Chemistry

Abstract

We assessed the isoform-specific effects of apolipoprotein (apo) E on the response of Neuro-2a cells to the amyloid beta peptide (Abeta1-42). As determined by the intracellular staining pattern and the release of beta-hexosaminidase into the cytosol, apoE4-transfected cells treated with aggregated Abeta1-42 showed a greater tendency toward lysosomal leakage than neo- or apoE3-transfected cells. Abeta1-42 caused significantly greater cell death and more than 2-fold greater DNA fragmentation in apoE4-secreting than in apoE3-secreting or control cells. H2O2 or staurosporine enhanced cell death and apoptosis in apoE4-transfected cells but not in apoE3-transfected cells. A caspase-9 inhibitor abolished the potentiation of Abeta1-42-induced apoptosis by apoE4. Similar results were obtained with conditioned medium from cells secreting apoE3 or apoE4. Cells preincubated for 4 h with a source of apoE3 or apoE4, followed by removal of apoE from the medium and from the cell surface, still exhibited the isoform-specific response to Abeta1-42, indicating that the potentiation of apoptosis required intracellular apoE, presumably in the endosomes or lysosomes. Studies of phospholipid (dimyristoylphosphatidylcholine) bilayer vesicles encapsulating 5-(and-6)-carboxyfluorescein dye showed that apoE4 remodeled and disrupted the phospholipid vesicles to a greater extent than apoE3 or apoE2. In response to Abeta1-42, vesicles containing apoE4 were disrupted to a greater extent than those containing apoE3. These findings are consistent with apoE4 forming a reactive molecular intermediate that avidly binds phospholipid and may insert into the lysosomal membrane, destabilizing it and causing lysosomal leakage and apoptosis in response to Abeta1-42.

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Crossref · 10.1074/jbc.m112109200

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Authors
Ji, Z.-S., Miranda, R. D., Newhouse, Y. M., Weisgraber, K. H., Huang, Y., & Mahley, R. W.
Affiliations
University of California, San Francisco (US)
Corresponding author
Mahley, Robert W.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2002-06
Volume
277
Issue
24
Pages
21821-21828
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2043090568
Cited by
177
References
115
Citations by year
2026: 8 · 2025: 8 · 2024: 9 · 2023: 2 · 2022: 3 · 2021: 7 · 2020: 8 · 2019: 6 · 2018: 3 · 2017: 7 · 2016: 8 · 2015: 7 · 2014: 4 · 2013: 6 · 2012: 11
FWCI
5.40
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5p01hl047660-10)
  • National Heart, Lung, and Blood Institute (HL-47660)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Lysosomal Storage Disorders Research
Keywords
APOE ε4, apolipoprotein E isoforms, amyloid-beta, amyloid-beta 42, apoptosis, N2a cells, caspase-9, DNA fragmentation, lysosomal membrane destabilization, endosomes, Alzheimer's disease
MeSH terms
Animals, Apolipoproteins E, Dimyristoylphosphatidylcholine, Enzyme Inhibitors, Humans, Hydrogen Peroxide, Lysosomes, Microscopy, Fluorescence, Neurons, Time Factors, Transfection, Tumor Cells, Cultured, Amyloid beta-Peptides, Apoptosis, Staurosporine, Protein Isoforms, Mice, Apolipoprotein E4, DNA Fragmentation

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