Abstract
The biochemical characteristics of the electron transfer chain are evaluated in purified non-synaptic (“free”) mitochondria from the forebrain of 60-week-old rats weekly subjected to peroxidative stress (once, twice, or three times) by the electrophilic prooxidant 2-cyclohexene-1-one. The following parameters are evaluated: (a) content of respiratory components, namely ubiquinone, cytochrome b, cytochrome c1, cytochrome c; (b) specific activity of enzymes, namely citrate synthase, succinate dehydrogenase, rotenone-sensitive NADH: cytochrome c reductase, cytochrome oxidase; (c) concentration of reduced glutathione (GSH). Before the first peroxidative stress induction, the rats are administered for 8 weeks by intraperitoneal injection of vehicle, papaverine, δ-yohimbine, almitrine or hopanthenate. The rats are treated also during the week(s) before the second or third peroxidative stress. The cerebral peroxidative stress induces: (a) initially, a decrease in brain GSH concentration concomitant with a decrease in the mitochondrial activity of cytochrome oxidase of aa3-type (complex IV), without changes in ubiquinone and cytochrome b populations; (b) subsequently, an alteration in the transfer molecule cytochrome c and, finally, in rotenone-sensitive NADH-cytochrome c reductase (complex I) and succinate dehydrogenase (complex II). The selective sensitivity of the chain components to peroxidative stress is supported by the effects of the concomitant subchronic treatment with agents acting at different biochemical steps. In fact, almitrine sets limits to its effects at cytochrome c content and aa3-type cytochrome oxidase activity, while δ-yohimbine sets limits to its effects at the level of tricarboxylic acid cycle (citrate synthase) and/or of intermediary between tricarboxylic acid cycle and complex II (succinate dehydrogenase). The effects induced by sequential peroxidative stress and drug treatment are supportive of the hypothesis that leakage of electrons (as a mandatory side-effect of the normal flux of electrons from both NADH and succinate to molecular oxygen) would be due to alteration in both availability of GSH and the content of components in the respiratory chain associated to energy-transducing system. In this field there is a cascade of derangements involving, at the beginning, the complex IV and, subsequently, other chain components, including cytochrome c and, finally, complexes II and I.
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Benzi, G., Curti, D., Pastoris, O. et al. Sequential damage in mitochondrial complexes by peroxidative stress. Neurochem Res 16, 1295–1302 (1991). https://doi.org/10.1007/BF00966660
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DOI: https://doi.org/10.1007/BF00966660