Cited by 42Cardiac Ischemia and ReperfusionNitric Oxide and Endothelin EffectsTransplantation: Methods and Outcomes

ROS scavenging before 27°C ischemia protects hearts and reduces mitochondrial ROS, Ca2+ overload, and changes in redox state

Camara, Amadou K. S., Aldakkak, Mohammed, Heisner, James S., Rhodes, Samhita S., Riess, Matthias L., An, JiangZhong, Heinen, André, Stowe, David F.·2007·American Journal of Physiology-Cell Physiology

Abstract

We have shown that cold perfusion of hearts generates reactive oxygen and nitrogen species (ROS/RNS). In this study, we determined 1) whether ROS scavenging only during cold perfusion before global ischemia improves mitochondrial and myocardial function, and 2) which ROS leads to compromised cardiac function during ischemia and reperfusion (I/R) injury. Using fluorescence spectrophotometry, we monitored redox balance (NADH and FAD), O 2•− levels and mitochondrial Ca 2+ (m[Ca 2+]) at the left ventricular wall in 120 guinea pig isolated hearts divided into control (Con), MnTBAP (a superoxide dismutase 2 mimetic), MnTBAP (M) + catalase (C) + glutathione (G) (MCG), C+G (CG), and N G-nitro-l-arginine methyl ester (l-NAME; a nitric oxide synthase inhibitor) groups. After an initial period of warm perfusion, hearts were treated with drugs before and after at 27°C. Drugs were washed out before 2 h at 27°C ischemia and 2 h at 37°C reperfusion. We found that on reperfusion the MnTBAP group had the worst functional recovery and largest infarction with the highest m[Ca 2+], most oxidized redox state and increased ROS levels. The MCG group had the best recovery, the smallest infarction, the lowest ROS level, the lowest m[Ca 2+], and the most reduced redox state. CG and l-NAME groups gave results intermediate to those of the MnTBAP and MCG groups. Our results indicate that the scavenging of cold-induced O 2•− species to less toxic downstream products additionally protects during and after cold I/R by preserving mitochondrial function. Because MnTBAP treatment showed the worst functional return along with poor preservation of mitochondrial bioenergetics, accumulation of H 2 O 2 and/or hydroxyl radicals during cold perfusion may be involved in compromised function during subsequent cold I/R injury.

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Crossref · 10.1152/ajpcell.00231.2006

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Authors
Camara, A. K. S., Aldakkak, M., Heisner, J. S., Rhodes, S. S., Riess, M. L., An, J., Heinen, A., & Stowe, D. F.
Affiliations
Medical College of Wisconsin (US)
Venue
American Journal of Physiology-Cell Physiology
Published
2007-06
Volume
292
Issue
6
Pages
C2021-C2031
ISSN
  • 0363-6143 (ISSN-L)
  • 1522-1563
OpenAlex
W2113073611
Cited by
42
References
52
Citations by year
2025: 2 · 2024: 1 · 2023: 1 · 2022: 2 · 2020: 3 · 2018: 3 · 2017: 2 · 2016: 1 · 2015: 2 · 2014: 4 · 2013: 4 · 2012: 3
FWCI
1.89
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Cell Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (K01HL073246, HL073246-01)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Health Sciences › Medicine › Surgery › Transplantation: Methods and Outcomes
Keywords
reactive oxygen species, cold ischemia, ischemia-reperfusion injury, superoxide radical scavenging, MnTBAP, catalase, glutathione, nitric oxide synthase inhibition, mitochondrial calcium overload, mitochondrial redox state, myocardial infarction, hydrogen peroxide, hydroxyl radicals, cardioprotection, isolated heart
MeSH terms
Animals, Calcium, Catalase, Female, Glutathione, Guinea Pigs, Ischemia, Male, Manganese, Mitochondria, Heart, Oxidation-Reduction, Temperature, Time Factors, Free Radical Scavengers, Reactive Oxygen Species, NG-Nitroarginine Methyl Ester

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