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Sequential damage in mitochondrial complexes by peroxidative stress.

G Benzi1, D Curti, O Pastoris

  • 1Institute of Pharmacology, Faculty of Sciences, University of Pavia, Italy.

Neurochemical Research
|December 1, 1991
PubMed
Summary
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Peroxidative stress in rat brains damages the electron transfer chain, initially affecting cytochrome oxidase and glutathione, then other complexes. Pre-treatments with agents like almitrine and delta-yohimbine show protective effects on specific mitochondrial components.

Area of Science:

  • Biochemistry
  • Neuroscience
  • Mitochondrial Biology

Background:

  • Mitochondria are crucial for cellular energy production.
  • Peroxidative stress can impair mitochondrial function and lead to neurodegeneration.
  • The electron transfer chain (ETC) is a key target of oxidative damage.

Purpose of the Study:

  • To investigate the biochemical impact of peroxidative stress on the mitochondrial ETC in rat forebrain.
  • To evaluate the protective effects of specific pharmacological agents against stress-induced mitochondrial damage.

Main Methods:

  • Purification of non-synaptic mitochondria from rat forebrain.
  • Induction of cerebral peroxidative stress using 2-cyclohexene-1-one.
  • Assessment of respiratory components (ubiquinone, cytochromes), enzyme activities (citrate synthase, succinate dehydrogenase, NADH: cytochrome c reductase, cytochrome oxidase), and reduced glutathione (GSH) levels.

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  • Administration of vehicle, papaverine, delta-yohimbine, almitrine, or hopanthenate prior to and during stress induction.

    • Main Results:

    • Peroxidative stress initially decreased GSH concentration and cytochrome oxidase (complex IV) activity.
    • Subsequent stress phases led to alterations in cytochrome c, rotenone-sensitive NADH: cytochrome c reductase (complex I), and succinate dehydrogenase (complex II).
    • Almitrine treatment limited effects on cytochrome c and cytochrome oxidase; delta-yohimbine limited effects on citrate synthase and succinate dehydrogenase.

    Conclusions:

    • Cerebral peroxidative stress selectively damages components of the mitochondrial electron transfer chain in a sequential manner.
    • Subchronic administration of certain agents (almitrine, delta-yohimbine) can mitigate specific aspects of this stress-induced mitochondrial dysfunction.
    • These findings highlight the vulnerability of the ETC to oxidative damage and the potential for targeted pharmacological interventions.