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The effect of an endothelin (ET) A/ETB receptor antagonist, TAK-044, and/or an angiotensin converting enzyme (ACE) inhibitor, temocaprilat, on myocardial metabolism and contraction during ischemia and reperfusion was examined by phosphorus 31-nuclear magnetic resonance (31P-NMR) in Langendorff rabbit hearts. After normothermic 15 min global ischemia, 60min of postischemic reperfusion was carried out. TAK-044 and/or temocaprilat was administered from 40 min prior to the global ischemia. Adenosine triphosphate (ATP), creatine phosphate, inorganic phosphate, pH, left ventricular systolic developed pressure (LVDev.P), left ventricular end-diastolic pressure (LVEDP) and coronary flow were measured. Twenty-eight hearts were divided into 4 experimental groups consisted of seven hearts each: Group I consisted of controls, Group II was perfused with TAK-044 (10(-6) mol/L), Group III was perfused with temocaprilat (10(-6) mol/L), and Group IV was perfused with TAK-044 (10(-6) mol/L) in combination with temocaprilat (10(-6) mol/L). Group II showed a more early recovery of ATP during postischemic reperfusion (82+/-3%) compared with Group I (71+/-3%). Group III showed a significant inhibition of the decrease in ATP during global ischemia (54+/-3%) compared with Group I (45+/-3%). Group IV also showed a significant marked inhibition of the decrease in ATP during global ischemia (59+/-5%) and a more significant improvement on recovery of ATP during postischemic reperfusion (86+/-3%) compared with the other 3 groups. There were no differences in LVDev.P, LVEDP and coronary flow among these groups. In conclusion, TAK-044 in combination with temocaprilat had a significant potentiation on myocardial metabolism during both ischemia and reperfusion.

japanese circulation journal

Effect of an Endothelin Receptor Antagonist and an Angiotensin Converting Enzyme Inhibitor on Metabolism and Contraction in the Ischemic and Reperfused Rabbit Heart