Akademik Veri Yönetim Sistemi
European Journal of Pharmacology, cilt.640, sa.1-3, ss.117-123, 2010 (SCI-Expanded)
Excessive intracellular Na+ accumulation followed by Ca2+ overload in cardiac tissue is one of the important mechanisms leading to ischemia/reperfusion injury. In the present study, the cardioprotective effects of 44Bu, 2-hydroxy-3-(butylamino) propyl-4-{(butoxycarbonyl)amino}benzoate hydrochloride, a novel Na+ channel blocker, on ischemia/reperfusion injury were investigated and compared to lidocaine. Isolated rat hearts perfused at the constant flow were exposed to global ischemia for 60min followed by 30min of reperfusion. In control hearts, ischemia/reperfusion markedly decreased left ventricular developed pressure and increased left ventricular end-diastolic pressure, and caused lactate dehydrogenase release and infarction. 44Bu (0.1, 0.3 and 1μM) or lidocaine (1 and 200μM) was administrated during the last 10min before ischemia and the first 5min of the reperfusion period. A significant post-ischemic functional recovery in the same degree was elicited by 0.3 and 1μM 44Bu or 200μM lidocaine. These effects of 44Bu and lidocaine closely correlated with the reduction in the infarct size and lactate dehydrogenase release. In contrast, 44Bu (0.1μM) or lidocaine (1μM) treatment did not result in a significant recovery in any of the examined parameters. In accordance with functional results, our electrophysiological data demonstrated that 44Bu was a more potent agent than lidocaine in terms of transient Na+ current inhibition. On the other hand, 44Bu did not cause any change in Ca2+ currents and on Na+/H+ exchange activity. These results show that 44Bu, as a novel Na+ channel blocker, has cardioprotective effects against ischemia/reperfusion injury. © 2010.