Mitochondrial complex I deficiency leads to increased production of superoxide radicals and induction of superoxide dismutase.
Open accessAbstract
Mitochondria were isolated from skin fibroblast cultures derived from healthy individuals (controls) and from a group patients with complex I (NADH-CoQ reductase) deficiency of the mitochondrial respiratory chain. The complex I deficient patients included those with fatal infantile lactic acidosis (FILA), cardiomyopathy with cataracts (CC), hepatopathy with tubulopathy (HT), Leigh's disease (LD), cataracts and developmental delay (CD), and lactic acidemia in the neonatal period followed by mild symptoms (MS). Production of superoxide radicals, on addition of NADH, were measured using the luminometric probe lucigenin with isolated fibroblast mitochondrial membranes. Superoxide production rates were highest with CD and decreased in the order CD >> MS > LD > control > HT > FILA = CC. The quantity of Mn-superoxide dismutase (MnSOD), as measured by ELISA techniques, however, was highest in CC and FILA and lowest in CD. Plots of MnSOD quantity versus superoxide production showed an inverse relationship for most conditions with complex I deficiency. We hypothesize that oxygen radical production is increased when complex I activity is compromised. However, the observed superoxide production rates are modulated by the variant induction of MnSOD which decreases the rates, sometimes below those seen in control fibroblast mitochondria. In turn, we show that the variant induction of MnSOD is most likely a function of the change in the redox state of the cell experienced rather than a result of the complex I defect per se.
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Rotenone inhibits complex I of the electron transport chain, leading to an increase in superoxide production by this complex.
“Rotenone inhibits complex I of the electron transport chain, leading to an increase in the production of superoxide by this complex (36, 38).”
From Mitochondrial Dysfunction Contributes to Oncogene-Induced Senescence (2009) · cites this paper as [38]
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- [13]13. Betts, W.H. 1986. Detecting radicals by chemiluminescence. In Handbook of methods for oxygen radical research. CRC Press, Inc. Boca Raton, FL. 197-201.
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- Authors
- Pitkanen, S., & Robinson, B. H.
- Affiliations
- University of Toronto (CA)
- ORCID
- Robinson, B H
- Venue
- Journal of Clinical Investigation
- Published
- 1996-07-15
- Volume
- 98
- Issue
- 2
- Pages
- 345-351
- ISSN
- 0021-9738 (ISSN-L)
- PMC
- PMC507436
- OpenAlex
- W2016163301
- Cited by
- 388
- References
- 0
- Citations by year
- 2026: 3 · 2025: 7 · 2024: 6 · 2023: 7 · 2022: 6 · 2021: 6 · 2020: 9 · 2019: 4 · 2018: 11 · 2017: 10 · 2016: 9 · 2015: 15 · 2014: 14 · 2013: 18 · 2012: 15
- FWCI
- 3.67
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Journal of Clinical Investigation (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- March of Dimes Foundation
- Australian Government
- Emil Aaltosen Säätiö
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Coenzyme Q10 studies and effects
- Keywords
- mitochondrial complex I deficiency, superoxide, superoxide dismutase, mitochondrial respiratory chain, dermal fibroblasts, Leigh syndrome, lactic acidemia, redox state, oxygen radical production
- MeSH terms
- Cataract, Cells, Cultured, Enzyme Induction, Fibroblasts, Humans, Infant, Infant, Newborn, Kinetics, Lactates, Leigh Disease, Liver Diseases, Metabolism, Inborn Errors, Mitochondria, Cardiomyopathies, Reference Values, Regression Analysis, Skin, Superoxides, Superoxide Dismutase, NAD(P)H Dehydrogenase (Quinone)
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