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Korshunov 1997 FEBS Letters

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Korshunov SS, Skulachev VP, Starkov AA (1997) High protonic potential actuates a mechanism of production of reactive oxygen species in mitochondria. FEBS Letters 416:15-8.

» PMID:9369223 Open Access

Korshunov SS, Skulachev VP, Starkov AA (1997) FEBS Letters

Abstract: Formation of H2O2 has been studied in rat heart mitochondria, pretreated with H2O2 and aminotriazole to lower their antioxidant capacity. It is shown that the rate of H2O2 formation by mitochondria oxidizing 6 mM succinate is inhibited by a protonophorous uncoupler, ADP and phosphate, malonate, rotenone and myxothiazol, and is stimulated by antimycin A. The effect of ADP is abolished by carboxyatractylate and oligomycin. Addition of uncoupler after rotenone induces further inhibition of H2O2 production. Inhibition of H2O2 formation by uncoupler, malonate and ADP+Pi is shown to be proportional to the ΔΨ decrease by these compounds. A threshold ΔΨ value is found, above which a very strong increase in H2O2 production takes place. This threshold slightly exceeds the state 3 ΔΨ level. The data obtained are in line with the concept [Skulachev, V.P., Q. Rev. Biophys. 29 (1996), 169–202] that a high proton motive force in state 4 is potentially dangerous for the cell due to an increase in the probability of superoxide formation.

Cited by

  • Komlodi et al (2022) Hydrogen peroxide production, mitochondrial membrane potential and the coenzyme Q redox state measured at tissue normoxia and experimental hyperoxia in heart mitochondria. MitoFit Preprints 2021 (in prep)
  • Komlódi T, Schmitt S, Zdrazilova L, Donnelly C, Zischka H, Gnaiger E (2022) Oxygen dependence of hydrogen peroxide production in isolated mitochondria and permeabilized cells. MitoFit Preprints 2022 (in prep).
  • Komlódi et al (2022) The protonmotive force - not merely membrane potential. MitoFit Preprints 2022 (in prep)

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MitoFit 2021 Tissue normoxia, MitoFit 2022 pmF, MitoFit 2021 AmR