title: Amyloid-beta dynamics correlate with neurological status in the injured human brain.
abstract: The amyloid-beta peptide (Abeta) plays a central pathophysiological role in Alzheimer's disease, but little is known about the concentration and dynamics of this secreted peptide in the extracellular space of the human brain. We used intracerebral microdialysis to obtain serial brain interstitial fluid (ISF) samples in 18 patients who were undergoing invasive intracranial monitoring after acute brain injury. We found a strong positive correlation between changes in brain ISF Abeta concentrations and neurological status, with Abeta concentrations increasing as neurological status improved and falling when neurological status declined. Brain ISF Abeta concentrations were also lower when other cerebral physiological and metabolic abnormalities reflected depressed neuronal function. Such dynamics fit well with the hypothesis that neuronal activity regulates extracellular Abeta concentration.
authors.affiliation: Department of Neurology, Washington University, St. Louis, MO 63110, USA. brodyd@neuro.wustl.edu
authors.forename: David L
authors.initials: DL
authors.lastname: Brody
authors.forename: Sandra
authors.initials: S
authors.lastname: Magnoni
authors.forename: Kate E
authors.initials: KE
authors.lastname: Schwetye
authors.forename: Michael L
authors.initials: ML
authors.lastname: Spinner
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Esparza
authors.forename: Nino
authors.initials: N
authors.lastname: Stocchetti
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Zipfel
authors.forename: David M
authors.initials: DM
authors.lastname: Holtzman