| Effect of A Kappa-opioid Receptor Agonist U50488H Given at Early Reperfusion Phase in Isolated Rat Hearts. |
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Yong Cheol Lee, Young Ho Jang, Jin Mo Kim, Ae Ra Kim, Chan Jin Kim, Yoon Nyun Kim |
1Department of Anesthesiology and Pain Medicine, Keimyung University, Daegu, Korea. weonjo@hotmail.com
2Department of Internal Medicine, School of Medicine, Keimyung University, Daegu, Korea. |
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| Abstract |
BACKGROUND
The experiment was performed to determine the role of kappa-opioid receptor (OR) agonist U50488H given at early reperfusion.
METHODS
Isolated hearts were subjected to 30 minutes of regional ischemia and 120 minutes of reperfusion.Hearts were assigned randomly to one of the three groups:1) Control (n = 9), 2) U50-1 (n = 8); 10micrometer of U50488H, and 3) U50-10 (n = 8); 10micrometer of U50488H.U50488 was perfused for a period of 5 min before and 30 min after reperfusion.
RESULTS
U50488H significantly reduced infarct size as a percentage of ischemic area (12.2 +/- 1.9% in U50-1 and 7.2 +/- 1.7% in U50-10, P < 0.001) compared to the control hearts (27.2 +/- 1.2%). After 2 hrs of reperfusion, left ventricular developed pressure was significantly recovered by U50488H (62.6 +/- 5.7% in U50-1 and 68.6 +/- 4.7% in U50-10, P = 0.018 and 0.002, respectively) compared to the control (46.3 +/- 4.4%).Rate-pressure product was improved by 100micrometer U50488H (62.3 +/- 5.5%, P = 0.007) but not by 1micrometer U50488H (50.0 +/- 4.1%) compared to the control (44.7 +/- 4.5%).U50488H significantly increased the + dP/dt(max) (77.9 +/- 5.5% in U50-1 and 78.0 +/- 4.3 in U50-10, P = 0.005 and 0.001 vs. control, respectively).The -dP/dt(min) also improved by 10micrometer U50488H (64.7 +/- 4.8%, P = 0.003) compared to control (47.0 +/- 2.7%).
CONCLUSIONS
U50488H given at early reperfusion phase reduces both infarct size and myocardial stunning in isolated rat hearts. |
| Key Words:
ischemia; myocardium; opioid receptor; reperfusion |
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