Cited by 22Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsSystemic Lupus Erythematosus Research

Antiphospholipid autoantibodies as blood biomarkers for detection of early stage Alzheimer’s disease

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McIntyre, John A., Ramsey, Curtis J., Gitter, Bruce D., Saykin, Andrew J., Wagenknecht, Dawn R., Hyslop, Paul A., for the Alzheimer’s Disease Neuroimaging Initiative·2015·Autoimmunity

Abstract

A robust blood biomarker is urgently needed to facilitate early prognosis for those at risk for Alzheimer's disease (AD). Redox reactive autoantibodies (R-RAAs) represent a novel family of antibodies detectable only after exposure of cerebrospinal fluid (CSF), serum, plasma or immunoglobulin fractions to oxidizing agents. We have previously reported that R-RAA antiphospholipid antibodies (aPLs) are significantly decreased in the CSF and serum of AD patients compared to healthy controls (HCs). These studies were extended to measure R-RAA aPL in serum samples obtained from Alzheimer's Disease Neuroimaging Initiative (ADNI). Serum samples from the ADNI-1 diagnostic groups from participants with mild cognitive impairment (MCI), AD and HCs were blinded for diagnosis and analyzed for R-RAA aPL by ELISA. Demographics, cognitive data at baseline and yearly follow-up were subsequently provided by ADNI after posting assay data. As observed in CSF, R-RAA aPL in sera from the AD diagnostic group were significantly reduced compared to HC. However, the sera from the MCI population contained significantly elevated R-RAA aPL activity relative to AD patient and/or HC sera. The data presented in this study indicate that R-RAA aPL show promise as a blood biomarker for detection of early AD, and warrant replication in a larger sample. Longitudinal testing of an individual for increases in R-RAA aPL over a previously established baseline may serve as a useful early sero-epidemiologic blood biomarker for individuals at risk for developing dementia of the Alzheimer's type.

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Crossref · 10.3109/08916934.2015.1008464

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  • AD has disease-specific alterations in humoral immunity that extend over canonical AD pathological targets.

    “pointing to diseasespecific alterations in humoral immunity that extend over canonical AD pathological targets [104].”

    From Is there a role for B cells in Alzheimer's disease? (2026) · cites this paper as [104]

    The Results (Pilot study) report altered antiphospholipid autoantibodies in MCI and AD groups, supporting humoral changes involving targets beyond canonical AD pathology. But the Discussion and conclusions say that selectivity for AD versus other neurological diseases still needs to be assessed, so the claim of disease-specific alterations is not established. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Redox-reactive anti-phospholipid autoantibodies are significantly reduced in the serum of AD patients relative to healthy controls.

    “redox-reactive anti­ phospholipid autoantibodies were found to be significantly reduced in the serum of AD patients relative to healthy controls”

    From Is there a role for B cells in Alzheimer's disease? (2026) · cites this paper as [104]

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Authors
McIntyre, J. A., Ramsey, C. J., Gitter, B. D., Saykin, A. J., Wagenknecht, D. R., Hyslop, P. A., & Initiative, F. T. A. D. N.
Affiliations
  • Franciscan Health Indianapolis (US)
  • Curtis Ramsey and Associates, Indianapolis, IN, USA,
  • Indiana University Indianapolis (US)
  • Indiana University School of Medicine (US)
  • Arkley BioTek, LLC, Indianapolis, IN, USA
Corresponding author
Hyslop, Paul A.
Venue
Autoimmunity
Published
2015-02-12
Volume
48
Issue
5
Pages
344-351
ISSN
  • 0891-6934 (ISSN-L)
  • 1607-842X
OpenAlex
W1978601320
Cited by
22
References
53
Citations by year
2026: 1 · 2025: 2 · 2023: 2 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 1 · 2017: 3 · 2016: 4 · 2015: 3
FWCI
2.98
Type
journal article
Language
en
Open access
Locations
  • Autoimmunity (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • IUScholarWorks (Indiana University) (submittedVersion)
  • Purdue University Indianapolis (Indiana University) (submittedVersion)
  • PMC
Funders
  • National Institutes of Health (UL1TR001108, 5u01ag024904-10)
  • National Institute on Aging (U01-AG-024904, P30AG010133, R01 AG19771, R01AG019771, RC2AG036535, P30 AG-10133, U24AG021886)
  • U.S. National Library of Medicine (R01LM011360)
  • National Center for Advancing Translational Sciences
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Rheumatology › Systemic Lupus Erythematosus Research
Keywords
antiphospholipid antibodies, Alzheimer's disease, blood biomarkers, early detection, mild cognitive impairment, serum, cerebrospinal fluid, oxidative stress, ADNI
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Enzyme-Linked Immunosorbent Assay, Female, Follow-Up Studies, Humans, Immunoglobulin G, Male, Pilot Projects, Prognosis, Reproducibility of Results, Biomarkers, Antibodies, Antiphospholipid

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