The influence of epimeric glycyrrhizic acid on production of endithelin-1 in lungs induced by ischemia-reperfusion injury in rabbits / 中华麻醉学杂志

ABSTRACT

Objective To evaluate the influence of epimeric glycyrrhizic acid on production of endothelin-1 (ET-1) in the lungs induced by ischemia-reperfusion(I/R) injury.Methods Twenty healthy long-ear white rabbits of both sexes, weighing 1.1-2.1kg were randomly divided into 2 groups: group I I/R alone ( n = 10) and group II I/R + epimeric glycyrrhizic acid (n = 10). The animals were anesthetized with thiopental 25 mg?kg-1 and tracheotomized and mechanically ventilated (FiO2 = 100% , VT = 10-13 ml?kg, RR = 20-30 bpm, I:E= 1: 1.2). Anesthesia was maintained with fentanyl, thiopental and vecuronium. Femoral artery was cannulated for continuous direct BP monitoring. MAP was maintained at 70-90 mm Hg during experiment. Right interval jugular vein was cannulated. Catheter was inserted into right atrium for fluid administration, blood sampling and right atrial pressure monitoring. Chest was opened and the hilum of right lung was mass-ligated to induce ischemia for 60 min and then released for reperfusion for 60 min. Epimeric glycyrrhizic acid 30 mg?kg-1 was given iv 30 min before ischemia of the right lung. Blood samples were taken from right atrium and femoral artery for determination of ET-1 concentration before ischemia of right lung (T0) and 1 and 5 min after right lung started being perfused (T1 , T2). At the end of 60 min reperfusion of the right lung, the animals were sacrificed and lungs (right and left) were removed for electron microscopic examination. Results In group 1 at T, the ET-1 levels in the blood from both femoral artery and right atrium were significantly higher than the baseline (T0) and the ET-1 concentration in the blood from femoral artery was significantly higher than that from right atrium. In group II there was no significant difference in blood ET-1 concentration between T0 and T, .Conclusion Ischemia-reperfusion induces increased production of ET-1 in the injured lung. Epimeric glycyrrhizic acid can inhibit the increase in the production of ET-1 in the induced by I/R.