Cited by 73Redox biology and oxidative stressMitochondrial Function and PathologyGlutathione Transferases and Polymorphisms

Mitochondrial respiratory chain and thioredoxin reductase regulate intermembrane Cu,Zn-superoxide dismutase activity: implications for mitochondrial energy metabolism and apoptosis

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Iñarrea, Pedro, Moini, Hadi, Han, Derick, Rettori, Daniel, Aguiló, Ignacio, Alava, Maria Angeles, Iturralde, María, Cadenas, Enrique·2007·Biochemical Journal

Abstract

IMS (intermembrane space) SOD1 (Cu/Zn-superoxide dismutase) is inactive in isolated intact rat liver mitochondria and is activated following oxidative modification of its critical thiol groups. The present study aimed to identify biochemical pathways implicated in the regulation of IMS SOD1 activity and to assess the impact of its functional state on key mitochondrial events. Exogenous H2O2 (5 μM) activated SOD1 in intact mitochondria. However, neither H2O2 alone nor H2O2 in the presence of mitochondrial peroxiredoxin III activated SOD1, which was purified from mitochondria and subsequently reduced by dithiothreitol to an inactive state. The reduced enzyme was activated following incubation with the superoxide generating system, xanthine and xanthine oxidase. In intact mitochondria, the extent and duration of SOD1 activation was inversely correlated with mitochondrial superoxide production. The presence of TxrR-1 (thioredoxin reductase-1) was demonstrated in the mitochondrial IMS by Western blotting. Inhibitors of TxrR-1, CDNB (1-chloro-2,4-dinitrobenzene) or auranofin, prolonged the duration of H2O2-induced SOD1 activity in intact mitochondria. TxrR-1 inactivated SOD1 purified from mitochondria in an active oxidized state. Activation of IMS SOD1 by exogenous H2O2 delayed CaCl2-induced loss of transmembrane potential, decreased cytochrome c release and markedly prevented superoxide-induced loss of aconitase activity in intact mitochondria respiring at state-3. These findings suggest that H2O2, superoxide and TxrR-1 regulate IMS SOD1 activity reversibly, and that the active enzyme is implicated in protecting vital mitochondrial functions.

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  1. Gardner, P. R., and White, C. W. (1995) In The Oxygen Paradox (Davies, K. J. A., and Ursini, F., eds.), pp. 33-50, Cleup University Press, Padova.

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Authors
Iñarrea, P., Moini, H., Han, D., Rettori, D., Aguiló, I., Alava, M. A., Iturralde, M., & Cadenas, E.
Affiliations
  • Universidad de Zaragoza (ES)
  • University of Southern California (US)
  • Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, 50009-Zaragoza, Spain
Venue
Biochemical Journal
Published
2007-06-13
Volume
405
Issue
1
Pages
173-179
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W1813348676
Cited by
73
References
33
Citations by year
2026: 2 · 2025: 4 · 2024: 1 · 2022: 2 · 2021: 4 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 3 · 2015: 3 · 2014: 2 · 2013: 3 · 2012: 6
FWCI
3.84
Type
journal article
Language
en
Open access
Locations
  • Biochemical Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
  • Trinity's Access to Research Output (TARA) (Trinity College Dublin) (submittedVersion, other-oa)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glutathione Transferases and Polymorphisms
Keywords
SOD1, Cu/Zn superoxide dismutase, intermembrane space, thioredoxin reductase 1, mitochondrial respiratory chain, superoxide, hydrogen peroxide, peroxiredoxin III, aconitase, cytochrome c release, mitochondrial membrane potential, apoptosis, mitochondrial bioenergetics, thiol oxidation, liver mitochondria
MeSH terms
Superoxide Dismutase-1, Aconitate Hydratase, Animals, Antimycin A, Electron Transport, Energy Metabolism, Enzyme Activation, Hydrogen Peroxide, Male, Membrane Potentials, Mitochondria, Liver, Superoxides, Superoxide Dismutase, Thioredoxin-Disulfide Reductase, Oxidants, Rats, Wistar, Apoptosis, Cell Respiration, Cytochromes c, Rats

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