Cited by 230Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchProtein Interaction Studies and Fluorescence Analysis

Amyloid-β Peptides Interact with Plasma Proteins and Erythrocytes: Implications for Their Quantitation in Plasma

Kuo, Yu-Min, Kokjohn, Tyler A., Kalback, Walter, Luehrs, Dean, Galasko, Douglas R., Chevallier, Nathalie, Koo, Edward H., Emmerling, Mark R. +1 more·2000·Biochemical and Biophysical Research Communications

Abstract

Amyloid beta peptides are bound rapidly in the plasma complicating an accurate assessment of their in vivo abundance by immunoassay procedures. The extent of Abeta immunoassay interference was used to estimate the Abeta binding capacity of purified plasma proteins, erythrocytes and whole plasma. Human serum albumin bound Abeta peptides rapidly with a 1:1 stoichiometry and at physiological concentrations was capable of binding over 95% of an input of 5 ng/ml Abeta. Purified alpha2-macroglobulin was able to bind Abeta peptides and at physiological concentration bound 73% of 5 ng/ml of Abeta. Erythrocytes also sequestered the Abeta peptides, showing a preference for binding Abeta 1-42. Incubation of 5 ng/ml of Abeta in plasma revealed that about 30% of the peptides were still detectable by immunoassay, presumably reflecting the binding of Abeta peptides with albumin and other plasma molecules. Thus, our studies reveal that both the soluble and formed elements of the blood are capable of sequestering Abeta peptides. To avoid underestimating plasma Abeta values, we employed an improved column chromatography method under denaturing conditions to liberate Abeta from its associations with plasma proteins. Quantification of Abeta 40 and 42 levels in plasma from both normal and AD individuals after chromatography showed a large overlap between AD and control groups, despite the very large pool of Abeta present in the AD brains. The potential origins of the plasma Abeta pool are discuss…

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Crossref · 10.1006/bbrc.2000.2222

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45 of 45 references verified0 citation errors · 0 not checkable

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  • Aβ-C3b-CR1-mediated interactions sequester Aβ42 to promote clearance to the periphery.

    “CR1 is predominantly expressed by erythrocytes (343, 344) and A 𝛃 -C3b-CR1-mediated interactions sequester A 𝛃 42 to promote clearance to periphery (180, 338), suggesting that CR1 variants can increase free blood A 𝛃 levels (343), which in turn can promote RAGE-mediated A 𝛃 re-entry across the BBB into the brain.”

    From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [338]

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Authors
Kuo, Y.-M., Kokjohn, T. A., Kalback, W., Luehrs, D., Galasko, D. R., Chevallier, N., Koo, E. H., Emmerling, M. R., & Roher, A. E.
Affiliations
  • Banner Sun Health Research Institute (US)
  • Midwestern University (US)
  • University of California San Diego (US)
Corresponding author
Roher, Alex E.
Venue
Biochemical and Biophysical Research Communications
Publisher
Elsevier BV
Published
2000-02
Volume
268
Issue
3
Pages
750-756
ISSN
0006-291X (ISSN-L)
OpenAlex
W2046703193
Cited by
230
References
46
Citations by year
2026: 7 · 2025: 9 · 2024: 10 · 2023: 11 · 2022: 10 · 2021: 15 · 2020: 7 · 2019: 14 · 2018: 8 · 2017: 16 · 2016: 13 · 2015: 7 · 2014: 12 · 2013: 7 · 2012: 8
FWCI
2.66
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemical and Biophysical Research Communications (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Aging (P50AG005131, AG-O5131)
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 › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Interaction Studies and Fluorescence Analysis
Keywords
amyloid-beta, immunoassay interference, human serum albumin, alpha2-macroglobulin, erythrocytes, amyloid-beta 42, Alzheimer's disease
MeSH terms
Aged, Aged, 80 and over, alpha-Macroglobulins, Alzheimer Disease, Blood Chemical Analysis, Blood Proteins, Erythrocytes, Female, Humans, Immunoassay, Male, Middle Aged, Peptide Fragments, Protein Binding, Serum Albumin, Case-Control Studies, Amyloid beta-Peptides, In Vitro Techniques

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