PMID: 9555085May 23, 1998Paper

Inhibition of cytochrome c oxidase activity by 4-hydroxynonenal (HNE). Role of HNE adduct formation with the enzyme subunits

Biochimica Et Biophysica Acta
J ChenGeorge I Henderson

Abstract

The role of 4-hydroxynonenal (HNE), a major lipid peroxidation product, in oxidative damage to mitochondrial cytochrome c oxidase (COX) was examined. Oxidative stress was induced in mitochondria isolated from livers of male Sprague-Dawley rats by tert-butylhydroperoxide (t-BHP). COX activity was inhibited, with a concomitant increase in endogenous HNE level in mitochondria. COX activity was also inhibited following incubation of mitochondria with 50-450 microM HNE. Blocking HNE degradation intensified COX inhibition by HNE and by t-BHP-induced oxidative stress, the latter accompanied by a simultaneous increase in endogenous HNE production. On the other hand, COX inhibition by HNE was markedly reduced by potentiating HNE degradation via enhancing conjugation of HNE with reduced glutathione (GSH). Incubation of purified COX with 10-400 microM HNE resulted in HNE adduct formation with specific subunits of COX, correlated with inhibition of the enzyme activity. These data suggest that HNE may inhibit mitochondrial COX by forming adducts with the enzyme, and that this could be one mechanism underlying mitochondrial damage caused by oxidative stress. The findings also illustrate a role for GSH in protecting mitochondria from the dele...Continue Reading

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