Detoxification of reactive aldehydes in mitochondria: effects of age and dietary restriction

Aging : Clinical and Experimental Research
J J Chen, B P Yu

Abstract

Previously, we proposed that reactive aldehydic products generated from lipid peroxidation might be the deleterious cause of mitochondrial dysfunction during aging. Our present study focuses on the roles that aging and dietary restriction (DR) play in the elimination of 4-hydroxynonenal (HNE) in rat liver by exploring three enzymatic systems: aldehyde dehydrogenase (ALDH), glutathione S-transferase (GST), and alcohol dehydrogenase (ADH). Results show that the main pathways of HNE elimination in mitochondria are through ALDH-catalyzed oxidation, and the GST-catalyzed conjugation of HNE. Findings also show that age reduces both ALDH and GST activities; mitochondrial HNE oxidation by ALDH declines at 18 and 24 months of age, and the glutathione conjugation of HNE reduces at 24 months of age. However, these enzymatic processes were found to be well-preserved in DR animals throughout their life span, supporting the evidence of less HNE accumulation in the membranes of restricted rats. These findings are consistent with our earlier proposal that indicates an age-associated decrease in mitochondrial detoxification as a major underlying process for malondialdehyde and lipofuscin accumulation in older animals. They also indicate that th...Continue Reading

References

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Citations

Jan 16, 2004·Experimental Gerontology·Vadim V DavydovAnatoly I Bozhkov
Feb 14, 2002·Free Radical Biology & Medicine·Nicola TraversoUmberto M Marinari
Apr 28, 1999·Free Radical Biology & Medicine·N TraversoU M Marinari
Oct 6, 2015·Biomolecules·Rudolf J SchaurPeter M Eckl
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Dec 12, 2007·Evolution; International Journal of Organic Evolution·James D FryMolly Saweikis
Sep 6, 2002·Biochemical Pharmacology·Srinivas BharathJulie K Andersen
Jun 27, 2014·Oxidative Medicine and Cellular Longevity·Changhe ZhangXiangcheng Li
Dec 7, 2010·Biochemical and Biophysical Research Communications·Ji-Woong ChoiSang Chul Park
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Apr 16, 2005·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Isabelle PiecDaniel Bechet
Jan 22, 1998·Free Radical Biology & Medicine·C M KangB P Yu

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