Effect of non-selective endothelin blockade, TAK-044, on the ischemic cellular injury of rat heart

The aim of this study is to evaluate the role of non-selective endothelin blockade (TAK-044) in ischemic myocardial injury. Forty anesthetized rats were separated into four groups: 1 TAK-I group, after preinjection of TAK-044 (3 mg/kg), LAD was ligated for 60 min and reperfused for 60 min, 3) Saline (SAL)-I group, LAD ligation and reperfusion without TAK-044, 3) TAK-C group, sham operated TAK group; 4) SAL-C group, sham- operated SAL group. Myocardium from each group was separated and analyzed by biochemical and ultrastructural procedures. Reperfusion arrhythmia (VT) was observed in 88 % of the SAL-I group, in contrast to only 36 % of the TAK-I group. At the end of reperfusion, hemodynamics indicated no significant differences between these two groups. The Ca++-ATPase activity of sarcoplasmic reticulum (SR) was 3.9 mu moles Pi/mg protein/h (39 % of SAL-C group) in the SAL-I group. while that in the TAK-I group was significantly higher at 6.1 (54 %). The ratio of infarct/risk area was 58 % in the SAL-I group rind 36 % in the TAK-I group. In the ultrastructural observations, irreversibly injured cells of the ischemic portion were reduced significantly from 35 % (SAL-I group) to 14 % (TAK-I group). Thus, our results indicated that endothelin blockade reduced ischemic cellular injury. The mechanism of this reduction was speculated to be a resistance to ischemic injury in the subcellular levels of the myocardium conferred by a reduction of vascular constriction and improvement of imbalance in the energy supply and demand.