Cited by 162Cardiac Ischemia and ReperfusionMitochondrial Function and PathologyRedox biology and oxidative stress

Mitochondrial Electron Transport can Become a Significant Source of Oxidative Injury in Cardiomyocytes

Vanden Hoek, Terry L., Shao, Zuohui, Li, Changqing, Schumacker, Paul T., Becker, Lance B.·1997·Journal of Molecular and Cellular Cardiology

Abstract

Ischemia/reperfusion causes oxidant injury in isolated cardiomyocytes without neutrophils or xanthine oxidase. Since these cells contain mitochondria, we hypothesized that the mitochondrial electron transport chain (ETC) causes this injury. To test this, we altered two conditions known to change within the mitochondria during ischemia/reperfusion-the extent of ETC redox-reduction and oxygen levels-and measured the resulting oxidant generation and injury. Specifically, we exposed cardiomyocytes for 1 h to the mitochondrial ETC inhibitors cyanide, antimycin, and rotenone and measured oxidant generation, using the intracellular fluorescent probe 2',7'-dichlorofluorescin (DCFH, sensitive to H2O2 and hydroxyl radicals). Inhibitors causing more extensive redox-reduction of the ETC (cyanide or antimycin) generated more oxidants than did partial ETC reduction with the inhibitor rotenone (10-fold v five-fold increases in DCFH oxidation). In addition, the DCFH oxidation caused by cyanide could be completely attenuated by the antioxidants 2-mercaptopropionylglycine (MPG) and 1,10 phenanthroline (PHEN). Finally, we tested the relevance of this oxidant generation on cell survival and contraction, with and without antioxidant interventions. Cell viability and contraction after 3-h recovery from cyanide exposure was significantly improved by either the addition of antioxidants, or by the "antioxidant" strategy of lowering O2 levels (i.e. from 150 to 3 tau) during the cyanide exposure (13.8% death with hypoxic cyanide v 48.6% cell death with normoxic cyanide). Collectively, these findings demonstrate that mitochondrial ETC carriers can cause significant oxidant injury, greatest when fully redox-reduced and exposed to oxygen, conditions known to occur in the transition from ischemia to reperfusion.

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Crossref · 10.1006/jmcc.1997.0481

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Authors
Vanden Hoek, T. L., Shao, Z., Li, C., Schumacker, P. T., & Becker, L. B.
Affiliations
University of Chicago (US)
Venue
Journal of Molecular and Cellular Cardiology
Publisher
Elsevier BV
Published
1997-09
Volume
29
Issue
9
Pages
2441-2450
ISSN
0022-2828 (ISSN-L)
OpenAlex
W1560838288
Cited by
161
References
0
Citations by year
2026: 1 · 2025: 1 · 2022: 1 · 2021: 2 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 3 · 2016: 1 · 2015: 1 · 2014: 9 · 2013: 10 · 2012: 6
FWCI
2.67
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Molecular and Cellular Cardiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5k08hl003459-03)
  • National Heart, Lung, and Blood Institute (HL 32646, HL-03459, R01HL035440, HL35440)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
  • 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
Keywords
mitochondrial electron transport chain, oxidant injury, cardiomyocytes, ischemia-reperfusion injury, cyanide, antimycin, rotenone, oxygen concentration, hydroxyl radicals, hydrogen peroxide, 2-mercaptopropionylglycine, 1,10-phenanthroline, antioxidants, cell viability, cardiomyocyte contraction, hypoxia
MeSH terms
Animals, Antioxidants, Biological Transport, Cell Survival, Cells, Cultured, Chick Embryo, Cyanides, Electrons, Fluoresceins, Tiopronin, Mitochondria, Heart, Myocardial Contraction, Myocardium, Oxygen, Phenanthrolines, Oxidants, Cell Death, Oxidative Stress

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