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Cited by 216

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A Specific Enzyme-Linked Immunosorbent Assay for Measuring β-Amyloid Protein Oligomers in Human Plasma and Brain Tissue of Patients With Alzheimer Disease

Open access
Xia, Weiming, Yang, Ting, Shankar, Ganesh, Smith, Imelda M., Shen, Yong, Walsh, Dominic M., Selkoe, Dennis J.·2009·Archives of Neurology

Abstract

OBJECTIVE: To examine in vivo levels of beta-amyloid (Abeta) oligomers (oAbeta) vs monomeric Abeta in plasma and brain tissue of patients with sporadic and familial Alzheimer disease (AD) using a new enzyme-linked immunosorbent assay (ELISA) specific for oAbeta. DESIGN: To establish the oAbeta ELISA, the same N-terminal Abeta antibody was used for antigen capture and detection. Plasma and postmortem brain tissue from patients with AD and control subjects were systematically analyzed by conventional monomeric Abeta and new oAbeta ELISAs. SUBJECTS: We measured oAbeta species in plasma samples from 36 patients with clinically well-characterized AD and 10 control subjects. In addition, postmortem samples were obtained from brain autopsies of 9 patients with verified AD and 7 control subjects. MAIN OUTCOME MEASURES: Oligomeric Abeta and 4 monomeric Abeta species in plasma samples from patients with AD and control subjects were measured by ELISA. RESULTS: The specificity of the oAbeta ELISA was validated with a disulfide-crossed-linked, synthetic Abeta(1-40)Ser26Cys dimer that was specifically detected before but not after the dissociation of the dimers in beta-mercaptoethanol. Plasma assays showed that relative oAbeta levels were closely associated with relative Abeta(42) monomer levels across all of the subjects. Analysis of sequential plasma samples from a subset of the patients with AD, including a patient with AD caused by a presenilin mutation, revealed decreases in both oAbeta and Abeta(42) monomer levels over a 1- to 2-year period. In brain tissue from 9 patients with AD and 7 control subjects, both oAbeta and monomeric Abeta(42) levels were consistently higher in the AD cases. CONCLUSIONS: An oAbeta-specific ELISA reveals a tight link between oAbeta and Abeta(42) monomer levels in plasma and brain. Both forms can decline over time in plasma, presumably reflecting their increasing insolubility in the brain.

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Metadata

Authors
Xia, W., Yang, T., Shankar, G., Smith, I. M., Shen, Y., Walsh, D. M., & Selkoe, D. J.
Venue
Archives of Neurology
Published
2009-02-01
Volume
66
Issue
2
Pages
190-9
ISSN
0003-9942 (ISSN-L)
OpenAlex
W2169579980
Cited by
216
References
8
FWCI
12.99
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: A Specific Enzyme-Linked Immunosorbent Assay for Measuring β-Amyloid Protein Oligomers in Human Plasma and Brain Tissue of Patients With Alzheimer Disease. https://app.cochat.ai/papers/10.1001/archneurol.2008.565
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Xia, W., Yang, T., Shankar, G., Smith, I. M., Shen, Y., Walsh, D. M., & Selkoe, D. J. (2009). A Specific Enzyme-Linked Immunosorbent Assay for Measuring β-Amyloid Protein Oligomers in Human Plasma and Brain Tissue of Patients With Alzheimer Disease. Archives of Neurology. https://doi.org/10.1001/archneurol.2008.565

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