Cited by 540Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Isoform-specific binding of apolipoprotein E to beta-amyloid.

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LaDu, M.J., Falduto, M.T., Manelli, A.M., Reardon, C.A., Getz, G.S., Frail, D.E.·1994·Journal of Biological Chemistry

Abstract

Apolipoprotein E (apoE), particularly the e4 allele, is genetically linked to the incidence of Alzheimer's disease. ApoE is present in the extracellular senile plaques and intracellular neurofibrillary tangles associated with Alzheimer's disease. In vitro, apoE has been shown to bind beta-amyloid (A beta), an amyloidogenic proteolytic product of amyloid precursor protein. To analyze the interaction of A beta and apoE, we used Western immunoblotting of human A beta-(1-40)-peptide incubated with conditioned medium from HEK-293 cells transfected with either human apoE3 or apoE4 (products of the e3 and e4 alleles, respectively) cDNA. Nonreducing SDS-polyacrylamide gel electrophoresis revealed the presence of an approximately 45-kDa complex with both A beta and apoE immunoreactivity. The level of the apoE3.A beta complex was approximately 20-fold greater than that of the apoE4.A beta complex. This apoE isoform-specific binding pattern was maintained from pH 5.0 to 9.0, from 2 min to 24 h of peptide incubation, and at concentrations of apoE from 5 to 100 micrograms/ml and of A beta from 10 microM to 1 mM. The higher level of apoE3 binding to A beta is in contrast to previously published data using purified apoE (Strittmatter, W. J., Weisgraber, K.H., Huang, D. Y., Dong, L.-M., Salvesen, G. S., Pericak-Vance, M., Schmechel, D., Saunders, A. M., Goldgaber, D., and Roses, A.D. (1993) Proc. Natl. Acad. Sci. U. S. A. 90, 8098-8102). Factors responsible for the isoform-specific interactions between apoE and A beta will require further study before the apparent discrepancy between these data can be reconciled.

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Crossref · 10.1016/s0021-9258(17)31529-6

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Authors
LaDu, M. J., Falduto, M. T., Manelli, A. M., Reardon, C. A., Getz, G. S., & Frail, D. E.
Affiliations
University of Chicago (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1994-09
Volume
269
Issue
38
Pages
23403-23406
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2128565374
Cited by
540
References
25
Citations by year
2026: 9 · 2025: 6 · 2024: 7 · 2023: 11 · 2022: 11 · 2021: 6 · 2020: 20 · 2019: 8 · 2018: 10 · 2017: 12 · 2016: 15 · 2015: 16 · 2014: 18 · 2013: 18 · 2012: 14
FWCI
13.63
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (7p01ag010481-05, 1f32hl008833-01, 5p50hl015062-25)
  • National Institute on Aging (AG10481)
  • National Heart, Lung, and Blood Institute (HL-15062, 1F32 HL08833-01)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
apolipoprotein E, amyloid-beta, APOE isoforms, APOE3, APOE ε4, protein-protein binding, Alzheimer's disease, amyloid precursor protein, amyloid plaques, neurofibrillary tangles
MeSH terms
Apolipoproteins E, Humans, Hydrogen-Ion Concentration, Protein Binding, Recombinant Proteins, Time Factors, Amyloid beta-Peptides, In Vitro Techniques

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