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4-Hydroxynonenal oxidatively modifies histones: implications for Alzheimer's disease
Jennifer Drake1, Robin Petroze, Alessandra Castegna
1Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA.
Neuroscience Letters
|March 24, 2004
Summary
Oxidative stress in Alzheimer's disease (AD) brain damages DNA. This study shows 4-hydroxynonenal (HNE) modifies histones, impairing their DNA binding and potentially increasing DNA vulnerability in AD.
Area of Science:
- Biochemistry
- Neuroscience
- Molecular Biology
Background:
- Alzheimer's disease (AD) brain exhibits DNA oxidation and altered DNA repair.
- Histones, DNA-binding proteins, may protect DNA from oxidative stress.
- Histones possess lysine residues susceptible to modification by 4-hydroxynonenal (HNE).
Purpose of the Study:
- To investigate the interaction between HNE and histones.
- To determine the effect of HNE modification on histone-DNA binding.
- To explore the role of histone modification in AD pathogenesis.
Main Methods:
- Electron paramagnetic resonance (EPR) spectroscopy with protein-specific spin labeling to measure histone conformational changes.
- Assessment of HNE binding to histones.
- Evaluation of the impact of HNE-modified histones on DNA binding affinity.
Main Results:
- HNE was found to bind to histones.
- HNE modification altered histone conformation.
- Covalently modified histones exhibited reduced DNA binding capacity.
- Acetylated histones were more susceptible to HNE modification compared to control histones.
Conclusions:
- Oxidative modification of histones by HNE may disrupt DNA-histone interactions.
- Altered DNA-histone binding, following HNE modification, could contribute to DNA oxidation in AD.
- These findings suggest a novel mechanism linking lipid peroxidation to DNA damage in Alzheimer's disease.