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Related Experiment Videos

Decrease in peptide methionine sulfoxide reductase in Alzheimer's disease brain.

S P Gabbita1, M Y Aksenov, M A Lovell

  • 1Sanders-Brown Center on Aging, University of Kentucky, Lexington 40536-0230, USA.

Journal of Neurochemistry
|September 29, 1999
PubMed
Summary
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Alzheimer's disease (AD) shows reduced activity of peptide, methionine sulfoxide reductase (MsrA), an antioxidant enzyme. This decline in MsrA activity may impair brain antioxidant defenses, contributing to AD pathophysiology.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Oxidative Stress Research

Background:

  • Alzheimer's disease (AD) pathophysiology is strongly linked to oxidative stress.
  • Oxidative damage to brain biomolecules is a hallmark of AD.
  • Methionine in proteins acts as an antioxidant, scavenging oxidants and forming methionine sulfoxide.

Purpose of the Study:

  • To quantify and compare peptide, methionine sulfoxide reductase (MsrA) activity in the brains of AD patients versus control subjects.
  • To investigate the relationship between MsrA activity and oxidative damage markers in AD brains.

Main Methods:

  • Measurement of MsrA enzyme activity across various brain regions in AD and control subjects.
  • Assessment of protein carbonyl content as a marker of oxidative damage.

Related Experiment Videos

  • Analysis of MsrA messenger RNA (mRNA) levels to explore potential regulatory mechanisms.

    • Main Results:

    • A significant decline in MsrA activity was observed in multiple brain regions of AD patients, notably the superior/middle temporal gyri, inferior parietal lobule, and hippocampus.
    • Elevated protein carbonyl content, indicative of increased oxidative damage, was found in most brain regions of AD patients.
    • mRNA analysis suggested post-translational modification or translational defects as potential causes for reduced MsrA activity, rather than transcriptional downregulation.

    Conclusions:

    • Reduced MsrA activity in AD brains may compromise the brain's antioxidant capacity.
    • This decline in antioxidant defense could exacerbate oxidative damage to critical neuronal proteins, contributing to AD progression.
    • Further research into MsrA regulation and function is warranted for understanding AD pathogenesis.