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Evidence of increased oxidative damage in subjects with mild cognitive impairment

J N Keller1, F A Schmitt, S W Scheff

  • 1Department of Anatomy, University of Kentucky, Lexington 40536-0230, USA. Jnkell0@pop.uky.edu

Neurology
|April 13, 2005
PubMed
Abstract

Insights

Oxidative damage is present in the brains of individuals with mild cognitive impairment (MCI). This damage, indicated by elevated biomarkers, may be an early event in the progression of Alzheimer disease (AD).

Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathology

Background:

  • Mild cognitive impairment (MCI) is a precursor to Alzheimer disease (AD).
  • Oxidative damage is implicated in neurodegenerative processes.
  • Understanding early pathological changes in MCI is crucial for AD prevention.

Purpose of the Study:

  • To investigate the presence and extent of oxidative damage in the brains of individuals with MCI.
  • To compare oxidative damage markers in MCI and early AD brains versus normal controls.
  • To explore the relationship between oxidative damage and cognitive decline.

Main Methods:

  • Analysis of protein carbonyls, thiobarbituric acid-reactive substances (TBARS), and malondialdehyde in brain tissue (superior and middle temporal gyri, cerebellum).
  • Comparison of tissue samples from individuals with MCI, early AD, and normal controls with short postmortem intervals.
  • Correlation of oxidative damage markers with neuritic/diffuse plaques and verbal memory performance.

Main Results:

  • Significantly elevated levels of protein carbonyls (~25%), malondialdehyde (~60%), and TBARS (~210%) were found in the SMTG of individuals with MCI and early AD compared to controls.
  • Increased TBARS levels correlated with the number of neuritic plaques.
  • Higher protein carbonyl levels were associated with poorer delayed verbal memory performance.

Conclusions:

  • Oxidative damage is evident in the brains of individuals with mild cognitive impairment.
  • These findings suggest that oxidative damage may represent an early pathological event in the development and progression of Alzheimer disease.
  • Targeting oxidative stress could be a potential therapeutic strategy for MCI and AD.

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