Cerebrospinal fluid amyloid beta(40) is decreased in cerebral amyloid angiopathy

Ann Neurol. 2009 Aug;66(2):245-9. doi: 10.1002/ana.21694.


Cerebral amyloid angiopathy is caused by deposition of the amyloid beta protein in the cerebral vasculature. In analogy to previous observations in Alzheimer disease, we hypothesized that analysis of amyloid beta(40) and beta(42) proteins in the cerebrospinal fluid might serve as a molecular biomarker. We observed strongly decreased cerebrospinal fluid amyloid beta(40) (p < 0.01 vs controls or Alzheimer disease) and amyloid beta(42) concentrations (p < 0.001 vs controls and p < 0.05 vs Alzheimer disease) in cerebral amyloid angiopathy patients. The combination of amyloid beta(42) and total tau discriminated cerebral amyloid angiopathy from controls, with an area under the receiver operator curve of 0.98. Our data are consistent with neuropathological evidence that amyloid beta(40) as well as amyloid beta(42) protein are selectively trapped in the cerebral vasculature from interstitial fluid drainage pathways that otherwise transport amyloid beta proteins toward the cerebrospinal fluid.

Publication types

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

MeSH terms

  • Aged
  • Alzheimer Disease / cerebrospinal fluid
  • Alzheimer Disease / diagnosis
  • Amyloid beta-Peptides / cerebrospinal fluid*
  • Area Under Curve
  • Biomarkers / cerebrospinal fluid
  • Cerebral Amyloid Angiopathy / cerebrospinal fluid*
  • Cerebral Amyloid Angiopathy / diagnosis
  • Cerebral Amyloid Angiopathy / genetics
  • Diagnosis, Differential
  • Enzyme-Linked Immunosorbent Assay
  • Female
  • Humans
  • Male
  • Middle Aged
  • Mutation
  • Peptide Fragments / cerebrospinal fluid*
  • Phosphorylation
  • ROC Curve
  • tau Proteins / cerebrospinal fluid


  • Amyloid beta-Peptides
  • Biomarkers
  • MAPT protein, human
  • Peptide Fragments
  • amyloid beta-protein (1-40)
  • amyloid beta-protein (1-42)
  • tau Proteins