Abstract
Nitric oxide (NO) has been reported to act both as a destructive and a protective agent in the pathogenesis of the injuries that occur during hypoxia/reoxygenation (H/R). It has been suggested that this dual role of NO depends directly on the isoform of NO synthase (NOS) involved. In this work, we investigate the role that NO derived from endothelial NOS (eNOS) plays in cardiac H/R-induced injury. Wistar rats were submitted to H/R (hypoxia for 30 min; reoxygenation of 0 h, 12 h and 5 days), with or without prior treatment using the selective eNOS inhibitor l-NIO (20 mg/kg). Lipid peroxidation, apoptosis and protein nitration, as well as NO production (NOx), were analysed. The results showed that l-NIO administration lowered NOx levels in all the experimental groups. However, no change was found in the lipid peroxidation level, the percentage of apoptotic cells or nitrated protein expression, implying that eNOS-derived NO may not be involved in the injuries occurring during H/R in the heart. We conclude that l-NIO would not be useful in alleviating the adverse effects of cardiac H/R.
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Abbreviations
- dUTP:
-
desoxyuridinetriphosphate
- eNOS:
-
endothelial nitric oxide synthase
- H/R:
-
hypoxia/reoxygenation
- NOS:
-
nitric oxide synthase
- PVDF:
-
polyvinylidenefluoride
- RNS:
-
reactive nitrogen species
- ROS:
-
reactive oxygen species
- TBA:
-
2 thiobarbituric acid
- TBARS:
-
thiobarbituric-acid-reactive substances
- TCA:
-
trichloroacetic acid
- TdT:
-
Terminal deoxynucleotidyl transferase
- TUNEL:
-
terminal-deoxynucleotidyl-transferase-mediated desoxyuridinetriphosphate nick end-labelling
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Acknowledgements
We wish to thank to Rafael Lomas for his assistance in statistics, and David Nesbitt for his editorial help with the English version of the manuscript. Supported by ‘MCyT’ (BIO 2000-0405-P4-05) and Junta de Andalucía (CVI-0184). This work was funded by Ministry of Education and Sciences of Spain; Grant number: SAF-2003-04398-C02-02.
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Corresponding editor: Ashima Anand
[Rus A, Peinado MA, Blanco S and del Moral ML 2011 Is endothelial-nitric-oxide-synthase-derived nitric oxide involved in cardiac hypoxia/reoxygenation-related damage? J. Biosci. 36 69–78] DOI 10.1007/s12038-011-9006-4
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Rus, A., Peinado, M., Blanco, S. et al. Is endothelial-nitric-oxide-synthase-derived nitric oxide involved in cardiac hypoxia/reoxygenation-related damage?. J Biosci 36, 69–78 (2011). https://doi.org/10.1007/s12038-011-9006-4
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DOI: https://doi.org/10.1007/s12038-011-9006-4