Cited by 72Cardiac Ischemia and ReperfusionMitochondrial Function and PathologyCell death mechanisms and regulation

Ischemic preconditioning requires increases in reactive oxygen release independent of mitochondrial K+ channel activity

Facundo, Heberty T.F., Carreira, Raquel S., de Paula, Juliana G., Santos, Célio C.X., Ferranti, Renato, Laurindo, Francisco R.M., Kowaltowski, Alicia J.·2006·Free Radical Biology and Medicine

Abstract

Mitochondrial ATP-sensitive K+ channels (mitoKATP) mediate ischemic preconditioning, a cardioprotective procedure. MitoKATP activity has been proposed to either enhance or prevent the release of reactive oxygen species. This study tested the redox effects of mitoKATP in order to clarify the role of these channels during preconditioning. We found no evidence that mitoKATP channels increase mitochondrial reactive oxygen species release directly. In addition, neither ischemic preconditioning nor the mitoKATP agonist diazoxide increased antioxidant defenses. Furthermore, increases in reactive oxygen species observed during ischemic preconditioning were not inhibited by mitoKATP antagonists, suggesting that they occur upstream of channel activity. Antioxidants were tested to verify if diazoxide-promoted ischemic protection was dependent on reactive oxygen species. N-Acetylcysteine proved to be an inadequate antioxidant for these tests since it directly interfered with the ability of diazoxide to activate mitoKATP. Catalase reversed the beneficial effect of preconditioning, but not of diazoxide, indicating that reactive oxygen species mediating preconditioning occur upstream of mitoKATP. Taken together, these results demonstrate that ischemic preconditioning increases reactive oxygen release independently of mitoKATP and suggest that the activity of this channel prevents oxidative reperfusion damage by decreasing reactive oxygen species production.

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Crossref · 10.1016/j.freeradbiomed.2005.08.041

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Authors
Facundo, H. T. F., Carreira, R. S., de Paula, J. G., Santos, C. C. X., Ferranti, R., Laurindo, F. R. M., & Kowaltowski, A. J.
Affiliations
Universidade de São Paulo (BR)
Corresponding author
Kowaltowski, Alicia J.
Venue
Free Radical Biology and Medicine
Publisher
Elsevier BV
Published
2006-02
Volume
40
Issue
3
Pages
469-479
ISSN
0891-5849 (ISSN-L)
OpenAlex
W2010935932
Cited by
72
References
49
Citations by year
2025: 4 · 2024: 3 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 5 · 2019: 2 · 2017: 3 · 2016: 1 · 2015: 2 · 2014: 6 · 2013: 2 · 2012: 2
FWCI
3.79
Type
journal article
Language
en
Open access
closed
Locations
  • Free Radical Biology and Medicine (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Fundação de Amparo à Pesquisa do Estado de São Paulo
  • Fundação para a Ciência e a Tecnologia
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 › Cell death mechanisms and regulation
Keywords
ischemic preconditioning, mitochondrial ATP-sensitive potassium channel, reactive oxygen species, diazoxide, cardioprotection, catalase, N-acetylcysteine, antioxidant defense, redox signaling
MeSH terms
Acetylcysteine, Adenosine Triphosphate, Animals, Antioxidants, Catalase, Diazoxide, Hydrogen Peroxide, Male, Mitochondria, Heart, Oxidation-Reduction, Potassium Channels, Rats, Sprague-Dawley, Reactive Oxygen Species, Ischemic Preconditioning, Rats

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