Antioxidant activity of U-83836E, a second generation lazaroid, during myocardial Ischemia/Reperfusion injury

Giuseppe M. Campo, Francesco Squadrito, Salvatore Campo, Domenica Altavilla, Angela Avenoso, Marcella Ferlito, Giovanni Squadrito, Achille P. Caputi

Research output: Contribution to journalArticle

Abstract

The 21-aminosteroid compounds are potent lipid per oxidation inhibitors belonging to a new class of antioxidants given the collective name of 'lazaroids'. They protect cells from oxidative damage induced by oxygen-based free radicals in a variety of in vitro and in vivo test systems. U-83836E is one of the second-generation lazaroids that are based on a non steroidal structure characterized by a ring portion of α-tocopherol bonded with various amine groups. We investigated the ability of U-83836E to reduce myocardial damage in rats undergoing left coronary artery occlusion for 60 min followed by 6 hours of reperfusion. This ischemia/reperfusion model produced wide heart necrosis, membrane lipid peroxidation, ventricular arrhythmias, tissue neutrophil infiltration and a marked decrease in endogenous antioxidants. Intravenous administration of U-83836E, (7.5, 15 and 30 mg/kg) at onset of reperfusion, reduced myocardial necrosis, expressed as a percentage of either the area at risk or the total left ventricle (p < 0.001), improved haemodynamic conditions by decreasing ventricular arrhythmias (p < 0.005), limited membrane lipid peroxidation (evaluated by assessing conjugated dienes, p < 0.001; and 4-hydroxy-nonenal, p < 0.001) restored the endogenous antioxidants vitamin E (p < 0.001), and superoxide dismutase (pt < 0.001). Furthermore, the lazaroid inhibited the derimental hydroxyl radical formation (p < 0.001), evaluated indirectly by a trapping agent and reduced heart neutrophil infiltration, measured by testing cardiac tissue elastase (p < 0.001) that is released from the stimulated granulocytes at the site of injury. These data suggest that this compound could be a new useful tool to study the mechanisms of oxidative damage during myocardial infarction.

Original languageEnglish (US)
Pages (from-to)577-590
Number of pages14
JournalFree Radical Research
Volume27
Issue number6
DOIs
StatePublished - Jan 1 1997

Keywords

  • Antioxidants
  • Free radicals
  • Lazaroids
  • Lipid peroxidation,
  • Myocardial injury
  • Vitamin E

ASJC Scopus subject areas

  • Biochemistry

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    Campo, G. M., Squadrito, F., Campo, S., Altavilla, D., Avenoso, A., Ferlito, M., Squadrito, G., & Caputi, A. P. (1997). Antioxidant activity of U-83836E, a second generation lazaroid, during myocardial Ischemia/Reperfusion injury. Free Radical Research, 27(6), 577-590. https://doi.org/10.3109/10715769709097861