Hydroxynonenal and uncoupling proteins: a model for protection against oxidative damage.

TitleHydroxynonenal and uncoupling proteins: a model for protection against oxidative damage.
Publication TypeJournal Article
Year of Publication2005
AuthorsEchtay, KS, Pakay, JL, Esteves, TC, Brand, MD
JournalBiofactors
Volume24
Issue1-4
Pagination119-30
Date Published2005
ISSN0951-6433
KeywordsAldehydes, Animals, Carrier Proteins, Humans, Ion Channels, Lipid Peroxidation, Membrane Proteins, Mitochondria, Mitochondrial ADP, ATP Translocases, Mitochondrial Proteins, Oxidative Phosphorylation, Oxidative Stress, Oxygen Consumption, Superoxides, Uncoupling Agents, Uncoupling Protein 1
Abstract

In this mini review we summarize recent studies from our laboratory that show the involvement of superoxide and the lipid peroxidation product 4-hydroxynonenal in the regulation of mitochondrial uncoupling. Superoxide produced during mitochondrial respiration is a major cause of the cellular oxidative damage that may underlie degenerative diseases and ageing. Superoxide production is very sensitive to the magnitude of the mitochondrial protonmotive force, so can be strongly decreased by mild uncoupling. Superoxide is able to give rise to other reactive oxygen species, which elicit deleterious effects primarily by oxidizing intracellular components, including lipids, DNA and proteins. Superoxide-induced lipid peroxidation leads to the production of reactive aldehydes, including 4-hydroxynonenal. These aldehydic lipid peroxidation products are in turn able to modify proteins such as mitochondrial uncoupling proteins and the adenine nucleotide translocase, converting them into active proton transporters. This activation induces mild uncoupling and so diminishes mitochondrial superoxide production, hence protecting against disease and oxidative damage at the expense of energy production.

DOI10.1002/biof.5520240114
Alternate JournalBiofactors
Citation Key10.1002/biof.5520240114
PubMed ID16403971