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From the Departments of Medicine,*
Pathology,||
and
Pharmacology
and the Center for Molecular
Neurosciences,
Vanderbilt University Medical
Center, Nashville, Tennessee; and the Sanders-Brown Center on
Aging§
and the Departments of Pathology and
Neurology, University of Kentucky Medical Center, Lexington, Kentucky
Numerous post mortem studies have
demonstrated increased accumulation of lipid peroxidation products in
diseased regions of Alzheimer's disease (AD) brain; however,
few have used techniques that quantify the magnitude of lipid
peroxidation in vivo. F2-isoprostanes
(F2-IsoP's) are exclusive products of free
radical-mediated peroxidation of arachidonic acid, and their
quantification has been widely used as an in vivo
biomarker of the magnitude of lipid peroxidation. We have determined
F2-IsoP concentrations in lateral ventricular fluid (VF)
from 23 AD and 12 age-matched controls and correlated these with
neuropathological and genetic markers of AD. VF F2-IsoP
levels were significantly elevated in AD patients compared with
controls (p < 0.01) and were significantly
correlated with three different measures of brain degeneration:
reduction in brain weight (p < 0.01),
degree of cortical atrophy (p < 0.01), and
Braak stage (p = 0.02). When analysis was
restricted to AD patients only, VF F2-IsoP levels
still were significantly correlated to reduction in brain weight and
degree of cortical atrophy (p < 0.05). VF
F2-IsoP concentrations were not related to density of
neuritic plaques or neurofibrillary tangles in seven brain
regions, or to the number of
4 alleles of the apolipoprotein
E gene (APOE). These data suggest that the magnitude of
brain lipid peroxidation is closely related to the extent of brain
degeneration in AD but is not significantly influenced by the density
of neuritic plaques or neurofibrillary tangles, or the number
of
4 alleles of APOE.
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