Longitudinal cerebrospinal fluid biomarker trajectories along the Alzheimer's disease continuum in the BIOMARKAPD study

Alzheimers Dement. 2019 Jun;15(6):742-753. doi: 10.1016/j.jalz.2019.01.015. Epub 2019 Apr 6.

Abstract

Introduction: Within-person trajectories of cerebrospinal fluid (CSF) biomarkers in Alzheimer's disease (AD) are not well defined.

Methods: We included 467 subjects from the BIOMARKAPD study with at least two serial CSF samples. Diagnoses were subjective cognitive decline (n = 75), mild cognitive impairment (n = 128), and AD dementia (n = 110), and a group of cognitively unimpaired subjects (n = 154) were also included. We measured baseline and follow-up CSF levels of total tau (t-tau), phosphorylated tau (p-tau), YKL-40, and neurofilament light (NfL). Median CSF sampling interval was 2.1 years.

Results: CSF levels of t-tau, p-tau, NfL, and YKL-40 were 2% higher per each year of baseline age in controls (P <.001). In AD, t-tau levels were 1% lower (P <.001) and p-tau levels did not change per each year of baseline age. Longitudinally, only NfL (P <.001) and YKL-40 (P <.02) increased during the study period.

Discussion: All four CSF biomarkers increase with age, but this effect deviates in AD for t-tau and p-tau.

Keywords: Alzheimer; Amyloid; CSF; Inflammation; Neurofilaments; Tau; YKL-40.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Alzheimer Disease* / cerebrospinal fluid
  • Alzheimer Disease* / diagnosis
  • Amyloid beta-Peptides / cerebrospinal fluid*
  • Apolipoproteins E / genetics
  • Biomarkers / cerebrospinal fluid*
  • Chitinase-3-Like Protein 1
  • Cognitive Dysfunction* / cerebrospinal fluid
  • Cognitive Dysfunction* / diagnosis
  • Female
  • Humans
  • Longitudinal Studies
  • Male
  • Middle Aged
  • Neurofilament Proteins / cerebrospinal fluid
  • Peptide Fragments
  • Phosphorylation
  • tau Proteins / cerebrospinal fluid*

Substances

  • Amyloid beta-Peptides
  • Apolipoproteins E
  • Biomarkers
  • CHI3L1 protein, human
  • Chitinase-3-Like Protein 1
  • Neurofilament Proteins
  • Peptide Fragments
  • amyloid beta-protein (1-42)
  • tau Proteins