1
|
Kronimus Y, Albus A, Hasenberg M, Walkenfort B, Seifert M, Budeus B, Gronewold J, Hermann DM, Ross JA, Lochnit G, Galuska SP, Marcus K, Sitek B, Klotsche J, Mengel D, Neumann S, Dodel R. Fc N-glycosylation of autoreactive Aβ antibodies as a blood-based biomarker for Alzheimer's disease. Alzheimers Dement 2023; 19:5563-5572. [PMID: 37260026 DOI: 10.1002/alz.13124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 01/22/2023] [Accepted: 01/24/2023] [Indexed: 06/02/2023]
Abstract
INTRODUCTION Naturally occurring autoantibodies (nAbs) against the pathologic isoform of amyloid beta (Aβ42 ) were found in body fluids and indicate a systemic B cell response that may prevent Alzheimer's disease (AD) onset. N-glycans attached to immunoglobulin G-Fab/Fc fragments are features that influence their mechanism of action. The aim was to study the role of N-glycans in nAbs-Aβ42 . METHODS nAbs-Aβ42 were isolated from AD patients and age-/sex-matched controls (n = 40) and immunoglobulin preparations. Glycosylated/deglycosylated nAbs-Aβ42 were analyzed for their effect on Aβ42 's aggregation, toxicity, and phagocytosis. Glycan structure was analyzed using matrix assisted laser desorption ionization time of flight mass spectrometry. RESULTS Deglycosylation of nAbs-Aβ42 had a major impact on Aβ42 's aggregation/toxicity/phagocytosis. The glycan structure showed considerable differences between AD and controls. We were able to predict disease status with a sensitivity/specificity of 95% (confidence interval [CI]: 76.4-99.7%)/100% (CI: 83.9-100%). DISCUSSION N-glycosylation has been identified as a critical attribute maintaining the beneficial effects of autoreactive Aβ antibodies. These data have consequences for the development of monocloncal Aβ antibodies and may open new avenues for diagnostics.
Collapse
Affiliation(s)
- Yannick Kronimus
- Chair of Geriatric Medicine and Center for Translational Neuro- and Behavioral Sciences, University Duisburg-Essen, Essen, Germany
| | - Alexandra Albus
- Chair of Geriatric Medicine and Center for Translational Neuro- and Behavioral Sciences, University Duisburg-Essen, Essen, Germany
| | - Mike Hasenberg
- Imaging Center Essen (Electron Microscopy), University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Bernd Walkenfort
- Imaging Center Essen (Electron Microscopy), University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Marc Seifert
- Institute of Cell Biology (Cancer Research), Medical Faculty, University Duisburg-Essen, Essen, Germany
| | - Bettina Budeus
- Institute of Cell Biology (Cancer Research), Medical Faculty, University Duisburg-Essen, Essen, Germany
| | - Janine Gronewold
- Department of Neurology, University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Dirk M Hermann
- Department of Neurology, University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - J Alexander Ross
- Chair of Geriatric Medicine and Center for Translational Neuro- and Behavioral Sciences, University Duisburg-Essen, Essen, Germany
| | - Günter Lochnit
- Protein Analytics, Department of Biochemistry, Justus Liebig University Giessen, Giessen, Germany
| | - Sebastian P Galuska
- Institute of Reproductive Biology, Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - Katrin Marcus
- Medizinisches Proteom-Center, Medical Faculty; Medical Proteome Analysis, Center for Proteindiagnostics (PRODI), Ruhr-University Bochum, Bochum, Germany
| | - Barbara Sitek
- Medizinisches Proteom-Center, Medical Faculty; Medical Proteome Analysis, Center for Proteindiagnostics (PRODI), Ruhr-University Bochum, Bochum, Germany
- Klinik für Anästhesiologie, Intensivmedizin und Schmerztherapie, Universitätsklinikum Knappschaftskrankenhaus Bochum, Bochum, Germany
| | - Jens Klotsche
- Epidemiology Unit, German Rheumatism Research Center Berlin - a Leibniz Institute (DRFZ), Berlin, Germany
| | - David Mengel
- Chair of Geriatric Medicine and Center for Translational Neuro- and Behavioral Sciences, University Duisburg-Essen, Essen, Germany
- Laboratory for Neurodegenerative Research, Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Sascha Neumann
- Chair of Geriatric Medicine and Center for Translational Neuro- and Behavioral Sciences, University Duisburg-Essen, Essen, Germany
| | - Richard Dodel
- Chair of Geriatric Medicine and Center for Translational Neuro- and Behavioral Sciences, University Duisburg-Essen, Essen, Germany
| |
Collapse
|