White Matter Hyperintensities Are No Major Confounder for Alzheimer's Disease Cerebrospinal Fluid Biomarkers

Viviana Greco, Andrea Urbani, Linda J.C. Van Waalwijk Van Doorn, Mohsen Ghafoorian, Esther M.C. Van Leijsen, Jurgen A.H.R. Claassen, Andrea Arighi, Marco Bozzali, Jorge Cannas, Enrica Cavedo, Paolo Eusebi, Lucia Farotti, Chiara Fenoglio, Juan Fortea, Giovanni B. Frisoni, Daniela Galimberti, Sanna-Kaisa Herukka, Yawu Liu, Alberto Lleó, Alexandre De MendonçaFlavio M. Nobili, Lucilla Parnetti, Agnese Picco, Maria Pikkarainen, Nicola Salvadori, Elio Scarpini, Hilkka Soininen, Roberto Tarducci, Eduard Vilaplana, Olga Meulenbroek, Bram Platel, Marcel M. Verbeek, H. Bea Kuiperij, Ralph Martins

Research output: Contribution to journalArticle

Abstract

Background: The cerebrospinal fluid (CSF) biomarkers amyloid-β 1-42 (Aβ42), total and phosphorylated tau (t-tau, p-tau) are increasingly used to assist in the clinical diagnosis of Alzheimer's disease (AD). However, CSF biomarker levels can be affected by confounding factors. Objective: To investigate the association of white matter hyperintensities (WMHs) present in the brain with AD CSF biomarker levels. Methods: We included CSF biomarker and magnetic resonance imaging (MRI) data of 172 subjects (52 controls, 72 mild cognitive impairment (MCI), and 48 AD patients) from 9 European Memory Clinics. A computer aided detection system for standardized automated segmentation of WMHs was used on MRI scans to determine WMH volumes. Association of WMH volume with AD CSF biomarkers was determined using linear regression analysis. Results: A small, negative association of CSF Aβ42, but not p-tau and t-tau, levels with WMH volume was observed in the AD (r2 = 0.084, p = 0.046), but not the MCI and control groups, which was slightly increased when including the distance of WMHs to the ventricles in the analysis (r2 = 0.105, p = 0.025). Three global patterns of WMH distribution, either with 1) a low, 2) a peak close to the ventricles, or 3) a high, broadly-distributed WMH volume could be observed in brains of subjects in each diagnostic group. Conclusion: Despite an association of WMH volume with CSF Aβ42 levels in AD patients, the occurrence of WMHs is not accompanied by excess release of cellular proteins in the CSF, suggesting that WMHs are no major confounder for AD CSF biomarker assessment.
Original languageEnglish
Pages (from-to)163-175
Number of pages13
JournalJournal of Alzheimer's Disease
Volume79
DOIs
Publication statusPublished - 2021

Keywords

  • Alzheimer's disease
  • amyloid
  • biomarkers
  • cerebrospinal fluid
  • magnetic resonance imaging
  • tau proteins
  • white matter hyperintensities
  • white matter lesions

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