Cited by 150Mitochondrial Function and PathologyRedox biology and oxidative stressCoenzyme Q10 studies and effects

High rates of superoxide production in skeletal-muscle mitochondria respiring on both complex I- and complex II-linked substrates

Muller, Florian L., Liu, Yuhong, Abdul-Ghani, Muhammad A., Lustgarten, Michael S., Bhattacharya, Arunabh, Jang, Youngmok C., Van Remmen, Holly·2008·Biochemical Journal

Abstract

Despite the considerable interest in superoxide as a potential cause of pathology, the mechanisms of its deleterious production by mitochondria remain poorly understood. Previous studies in purified mitochondria have found that the highest rates of superoxide production are observed with succinate-driven reverse-electron transfer through complex I, although the physiological importance of this pathway is disputed because it necessitates high concentrations of succinate and is thought not to occur when NAD is in the reduced state. However, very few studies have examined the rates of superoxide production with mitochondria respiring on both NADH-linked (e.g. glutamate) and complex II-linked substrates. In the present study, we find that the rates of superoxide production (measured indirectly as H2O2) with glutamate+succinate (∼1100 pmol of H2O2·min−1·mg−1) were unexpectedly much higher than with succinate (∼400 pmol of H2O2·min−1·mg−1) or glutamate (∼80 pmol of H2O2·min−1·mg−1) alone. Superoxide production with glutamate+succinate remained high even at low substrate concentrations (<1 mM), was decreased by rotenone and was completely eliminated by FCCP (carbonyl cyanide p-trifluoromethoxyphenylhydrazone), indicating that it must in large part originate from reverse-electron transfer through complex I. Similar results were obtained when glutamate was replaced with pyruvate, α-ketoglutarate or palmitoyl carnitine. In contrast, superoxide production was consistently lowered by the addition of malate (malate+succinate ∼30 pmol of H2O2·min−1·mg−1). We propose that the inhibitory action of malate on superoxide production can be explained by oxaloacetate inhibition of complex II. In summary, the present results indicate that reverse-electron transfer-mediated superoxide production can occur under physiologically realistic substrate conditions and suggest that oxaloacetate inhibition of complex II may be an adaptive mechanism to minimize this.

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Crossref · 10.1042/bj20071162

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Authors
Muller, F. L., Liu, Y., Abdul-Ghani, M. A., Lustgarten, M. S., Bhattacharya, A., Jang, Y. C., & Van Remmen, H.
Affiliations
  • Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, Texas Research Park Campus, 15355 Lambda Drive, San Antonio, TX 78229-3900, U.S.A.
  • The University of Texas at San Antonio Health Science Center (US)
  • South Texas Veterans Health Care System (US)
Corresponding author
Bhattacharya, Arunabh
Venue
Biochemical Journal
Published
2007-12-21
Volume
409
Issue
2
Pages
491-499
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W2133593669
Cited by
150
References
59
Citations by year
2025: 4 · 2024: 2 · 2023: 6 · 2022: 3 · 2021: 6 · 2020: 7 · 2019: 6 · 2018: 7 · 2017: 9 · 2016: 7 · 2015: 9 · 2014: 11 · 2013: 9 · 2012: 16
FWCI
4.11
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemical Journal (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Aging (5T3 AG 021890 02, 1P30- AG13319, P01 AG19316, P01AG020591, P01AG019316, T32AG021890, P30AG013319)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Coenzyme Q10 studies and effects
Keywords
superoxide production, skeletal muscle mitochondria, reverse electron transfer, complex I, complex II, succinic acid, glutamate, hydrogen peroxide, malate, rotenone, FCCP, pyruvate, alpha-ketoglutarate, palmitoylcarnitine
MeSH terms
Animals, Dose-Response Relationship, Drug, Malates, Mice, Inbred C57BL, Mitochondria, Muscle, NAD, Superoxides, Muscle, Skeletal, Glutamic Acid, Succinic Acid, Electron Transport Complex II, Electron Transport Complex I, Mice, Oxaloacetic Acid

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