抄録
Ischemic acute renal failure is associated with vascular endothelial dysfunction. We examined whether vasodilatory antihypertensive agents would improve endothelial function in rats with ischemia/reperfusion renal injury. Rat kidneys were isolated and perfused after clipping of the bilateral renal arteries for 45min and reperfusion for 24h, and renal perfusion pressure and nitric oxide concentration in the venous effluent (chemiluminescence assay) were monitored. Preischemic administration of celiprolol (a β-blocker; 100mg/kg p.o.), benidipine (a calcium channel blocker; 1mg/kg p.o.), or imidapril (an angiotensin converting-enzyme inhibitor; 3mg/kg p.o.) restored endothelial function in rats subjected to acute renal ischemia (Δrenal perfusion pressure [10-8M acetylcholine]: sham -42±3%, ischemia -31±1%, ischemia +celiprolol -39±1%*, ischemia+benidipine -38±2%*, ischemia+imidapril -42±2%*; *p<0.05 vs. ischemia). Serum urea nitrogen and creatinine levels were also lower in the treated groups. Furthermore, ischemia-induced decreases in the response to acetylcholine and renal excretory function were smaller in SHR than in deoxycorticosterone-salt hypertensive rats, in which endothelial damage was marked. These results suggest that preischemic endothelial function may influence the degree of ischemic renal injury. Calcium channel blockers, converting-enzyme inhibitors, and endothelial NO synthase-activating β-blockers had beneficial effects on renovascular endothelial dysfunction due to ischemia. (Hypertens Res 2000; 23: 527-533)
