Dexrazoxane Shows No Protective Effect in the Acute Phase of Reperfusion during Myocardial Infarction in Pigs

PLoS One. 2016 Dec 21;11(12):e0168541. doi: 10.1371/journal.pone.0168541. eCollection 2016.

Abstract

Calcium and iron overload participate in the mechanisms of ischemia/reperfusion (I/R) injury during myocardial infarction (MI). Calcium overload induces cardiomyocyte death by hypercontraction, while iron catalyses generation of reactive oxygen species (ROS). We therefore hypothesized that dexrazoxane, an intracellular metal chelator, would attenuate I/R injury. MI was induced in pigs by occlusion of the left anterior descending artery for 1 hour followed by 2 hours reperfusion. Thirty minutes before reperfusion either 5 mg/ml dexrazoxane (n = 5) or saline (n = 5) was infused intravenously. Myocardial necrosis as percentage of the area at ischemic risk was found to be similar in both groups (77.2 ± 18% for dexrazoxane and 76.4 ± 14% for saline group) as determined by triphenyl tetrazolium chloride staining of the ischemic myocardium. Also, serum levels of troponin-I were similar in both groups. A conductance catheter was used to measure left ventricular pressure and volume at all times. Markers for tissue damage due to ROS (HNE), endothelial cell activation (CD31) and inflammation (IgG, C3b/c, C5b9, MCP-1) were assessed on tissue and/or in serum. No significant differences were observed between the groups for the parameters analyzed. To conclude, in this clinically relevant model of early reperfusion after acute myocardial ischemia, dexrazoxane lacked attenuating effects on I/R injury as shown by the measured parameters.

MeSH terms

  • Acute Disease
  • Administration, Intravenous
  • Animals
  • Chemokine CCL2 / metabolism
  • Complement C3c / metabolism
  • Complement Membrane Attack Complex / metabolism
  • Dexrazoxane / pharmacology
  • Dexrazoxane / therapeutic use*
  • Disease Models, Animal
  • Myocardial Infarction / drug therapy
  • Myocardial Infarction / etiology*
  • Myocardial Infarction / pathology
  • Myocardial Reperfusion Injury / complications
  • Myocardial Reperfusion Injury / prevention & control*
  • Myocardium / pathology
  • Necrosis
  • Platelet Endothelial Cell Adhesion Molecule-1 / metabolism
  • Reactive Oxygen Species / metabolism
  • Risk Factors
  • Swine
  • Troponin I / blood
  • Ventricular Function, Left / drug effects

Substances

  • Chemokine CCL2
  • Complement Membrane Attack Complex
  • Platelet Endothelial Cell Adhesion Molecule-1
  • Reactive Oxygen Species
  • Troponin I
  • Dexrazoxane
  • Complement C3c

Grants and funding

This study was supported by the Swiss National Science Foundation, grants no. 3200B0-116618 and 32003B_135272. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.