Cerebrospinal fluid proteomic profiling of individuals with mild cognitive impairment and suspected non-Alzheimer's disease pathophysiology

Aurore Delvenne, Johan Gobom, Betty Tijms, Isabelle Bos, Lianne M. Reus, Valerija Dobricic, Mara ten Kate, Frans Verhey, Inez Ramakers, Philip Scheltens, Charlotte E. Teunissen, Rik Vandenberghe, Jolien Schaeverbeke, Silvy Gabel, Julius Popp, Gwendoline Peyratout, Pablo Martinez-Lage, Mikel Tainta, Magda Tsolaki, Yvonne Freund-LeviSimon Lovestone, Johannes Streffer, Frederik Barkhof, Lars Bertram, Kaj Blennow, Henrik Zetterberg, Pieter Jelle Visser, Stephanie J. B. Vos

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Background: Suspected non-Alzheimer's disease pathophysiology (SNAP) is a biomarker concept that encompasses individuals with neuronal injury but without amyloidosis. We aim to investigate the pathophysiology of SNAP, defined as abnormal tau without amyloidosis, in individuals with mild cognitive impairment (MCI) by cerebrospinal fluid (CSF) proteomics. Methods: Individuals were classified based on CSF amyloid beta (Aβ)1-42 (A) and phosphorylated tau (T), as cognitively normal A—T– (CN), MCI A–T+ (MCI-SNAP), and MCI A+T+ (MCI-AD). Proteomics analyses, Gene Ontology (GO), brain cell expression, and gene expression analyses in brain regions of interest were performed. Results: A total of 96 proteins were decreased in MCI-SNAP compared to CN and MCI-AD. These proteins were enriched for extracellular matrix (ECM), hemostasis, immune system, protein processing/degradation, lipids, and synapse. Fifty-one percent were enriched for expression in the choroid plexus. Conclusion: The pathophysiology of MCI-SNAP (A–T+) is distinct from that of MCI-AD. Our findings highlight the need for a different treatment in MCI-SNAP compared to MCI-AD.
Original languageEnglish
JournalAlzheimer's and Dementia
Early online date2022
DOIs
Publication statusE-pub ahead of print - 2022

Keywords

  • Alzheimer's disease
  • biomarkers
  • cerebrospinal fluid
  • mild cognitive impairment
  • pathophysiology
  • proteomics
  • suspected non-Alzheimer's disease pathophysiology
  • tau

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