Elsevier

Neuroscience Letters

Volume 397, Issue 3, 24 April 2006, Pages 170-173
Neuroscience Letters

Elevated protein-bound levels of the lipid peroxidation product, 4-hydroxy-2-nonenal, in brain from persons with mild cognitive impairment

https://doi.org/10.1016/j.neulet.2005.12.017Get rights and content

Abstract

Oxidative damage is a feature of many age-related neurodegenerative diseases, including Alzheimer's disease (AD). 4-Hydroxy-2-nonenal (HNE) is a highly reactive product of the free radical-mediated lipid peroxidation of unsaturated lipids, particularly arachidonic acid, in cellular membranes. In the present study we show for the first time in brain obtained at short postmortem intervals that the levels of HNE are elevated in mild cognitive impairment (MCI) hippocampus and inferior parietal lobules compared to those of control brain. Thus, increased levels of HNE in MCI brain implicate lipid peroxidation as an early event in AD pathophysiology and also suggest that the pharmacologic intervention to prevent lipid peroxidation at the MCI stage or earlier may be a promising therapeutic strategy to delay or prevent progression to AD.

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Acknowledgements

The authors would like to thank the University of Kentucky ADRC Clinical Neuropathology Core faculty for providing the brain tissue used for this study. This work was supported in part by NIH grants to D.A.B. [AG-05119; AG-10836].

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      In turn, protein modification can take place as a result of indirect oxidation by formation of protein adducts with 4-HNE. Increased levels of 4-HNE were reported in brain regions showing histopathological alterations of AD in this disorder and its earlier stage, MCI [31–36]. Oxidative modification of lipoic acid by 4-HNE was altered in AD hippocampus, with implications for pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase enzymatic activities [37].

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