Assessment of Amyloid β Protein in Cerebrospinal Fluid as an Aid in the Diagnosis of Alzheimer's Disease
Abstract
Abstract: The principal constituent of amyloid plaques found in the brains of individuals with Alzheimer's disease (AD) is a 39–42‐amino‐acid protein, amyloid β protein (Aβ). This study examined whether the measurement of Aβ levels in CSF has diagnostic value. There were 108 subjects enrolled in this prospective study: AD (n = 39), non‐AD controls (dementing diseases/syndromes; n = 20), and other (n = 49). CSF was obtained by lumbar puncture, and Aβ concentrations were determined using a dual monoclonal antibody immunoradiometric sandwich assay. The mean Aβ value for the AD group (15.9 ± 6.8 ng/ml) was not significantly different from that for the non‐AD control group (13.0 ± 7.1 ng/ml; p = 0.07), and substantial overlap in results were observed. Aβ values did not correlate with age (r = −0.05, p = 0.59), severity of cognitive impairment (r = 0.22, p = 0.21), or duration of AD symptoms (r = 0.14, p = 0.45). These findings are in conflict with other reports in the literature; discrepant results could be due to the instability of Aβ in CSF. Aβ immunoreactivity decays rapidly under certain conditions, particularly multiple freeze/thaw cycles. Use of a stabilizing sample treatment buffer at the time of lumbar puncture allows storage of CSF without loss of Aβ reactivity. In conclusion, the total CSF Aβ level is not a useful marker for current diagnosis of AD.
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- Authors
- Southwick, P. C., Yamagata, S. K., Echols, C. L., Higson, G. J., Neynaber, S. A., Parson, R. E., & Munroe, W. A.
- Affiliations
- Barrow Neurological Institute (US)
- Corresponding author
- Southwick, Paula C.
- ORCID
- Southwick, Paula C.
- Venue
- Journal of Neurochemistry
- Publisher
- Wiley
- Published
- 1996-01
- Volume
- 66
- Issue
- 1
- Pages
- 259-265
- ISSN
- 0022-3042 (ISSN-L)
- 1471-4159
- OpenAlex
- W1991413414
- Cited by
- 89
- References
- 0
- Citations by year
- 2024: 1 · 2022: 1 · 2021: 1 · 2020: 2 · 2018: 2 · 2017: 3 · 2016: 3 · 2015: 1 · 2014: 2 · 2013: 6 · 2012: 2
- FWCI
- 7.09
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Neurochemistry (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Cerebrospinal fluid and hydrocephalus
- Keywords
- amyloid-beta, cerebrospinal fluid, Alzheimer's disease, diagnostic biomarkers, amyloid plaques, freeze-thaw cycles, cognitive impairment, immunoradiometric assay
- MeSH terms
- Adolescent, Adult, Aged, Aged, 80 and over, Alzheimer Disease, Autoimmune Diseases, Mental Disorders, Cerebrospinal Fluid Proteins, Female, Humans, Infections, Inflammation, Male, Metabolic Diseases, Middle Aged, Nervous System Diseases, Predictive Value of Tests, Prospective Studies, Biomarkers, Prevalence, Amyloid beta-Peptides
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