The aim of the study was to investigate the cytoprotective effect of a calcium channel blocker, nicardipine, on altered renal function due to cold ischemia for 72 h. The experiments were performed on isolated perfused kidneys from adult rabbits. Kidneys were perfused with either standard Euro-Collins (EC) solution (n = 7) or EC containing nicardipine (n = 6) and then incubated with the same preservation solutions in a beaker exposed to cold ischemia for 72 h at +4 degrees C. In the control group the same procedure was applied to untreated kidneys (n = 6) which were exposed to cold ischemia for 30 min. Vascular responses and urinary output to noradrenaline, angiotensin II, endothelin-1, acetylcholine and sympathetic stimulation were assessed as the functional activities of the kidney. The responses of the preserved kidneys were compared following cold ischemic conditions. The results indicate that the addition of nicardipine to EC solution protects the vascular endothelial regulatory function and urine excretion; therefore, dihydropyridine calcium channel blockers might be useful for kidney preservation.
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