Cerebrospinal fluid β-amyloid 42 and neurofilament light relate to white matter hyperintensities

Neurobiol Aging. 2018 Aug;68:18-25. doi: 10.1016/j.neurobiolaging.2018.03.028. Epub 2018 Apr 3.

Abstract

White matter hyperintensities (WMHs) are associated with poorer brain health, but their pathophysiological substrates remain elusive. To better understand the mechanistic underpinnings of WMHs among older adults, this study examined in vivo cerebrospinal fluid biomarkers of β-amyloid42 deposition (Aβ42), hyperphosphorylated tau pathology, neurodegeneration (total tau), and axonal injury (neurofilament light [NFL]) in relation to log-transformed WMHs volume. Participants free of clinical stroke and dementia were drawn from the Vanderbilt Memory & Aging Project (n = 148, 72 ± 6 years). Linear regression models adjusted for age, sex, race/ethnicity, education, intracranial volume, modified Framingham Stroke Risk Profile (excluding points assigned for age), cognitive diagnosis, and APOE-ε4 carrier status. Aβ42 (β = -0.001, p = 0.007) and NFL (β = 0.0003, p = 0.01) concentrations related to WMHs but neither hyperphosphorylated tau nor total tau associations with WMHs reached statistical significance (p-values > 0.21). In a combined model, NFL accounted for 3.2% of unique variance in WMHs and Aβ42 accounted for an additional 4.3% beyond NFL, providing novel evidence of the co-occurrence of at least 2 distinct pathways for WMHs among older adults, including amyloid deposition and axonal injury.

Keywords: Amyloid; Cerebrospinal fluid; Dementia; Neurofilament light; White matter hyperintensities; β-amyloid(42).

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aged, 80 and over
  • Amyloid beta-Peptides / cerebrospinal fluid*
  • Biomarkers / cerebrospinal fluid
  • Female
  • Humans
  • Magnetic Resonance Imaging
  • Male
  • Middle Aged
  • Neurofilament Proteins / cerebrospinal fluid*
  • Peptide Fragments / cerebrospinal fluid*
  • White Matter / diagnostic imaging*
  • White Matter / pathology*

Substances

  • Amyloid beta-Peptides
  • Biomarkers
  • Neurofilament Proteins
  • Peptide Fragments
  • amyloid beta-protein (1-42)
  • neurofilament protein L