Renal ischemia and reperfusion injury: influence of chorpromazine on renal function and lipid peroxidation Lesão de isquemia e reperfusão renal: influência da clorpromazina na função renal e na peroxidação lipídica

Purpose: To evaluate the influence of chlorpromazine (CPZ) on renal function and lipid peroxidation in a rat model of kidney ischemia/reperfusion injury. Methods: Forty eight Wistar rats underwent a laparotomy for hilar clamping of left kidney with a bulldog clamp for 60 minutes followed by organ reperfusion and contralateral nephrectomy. Of these, 26 received 3mg/kg of CPZ intravenously 15 minutes before renal ischemia (G-E) while the remaining 22 were used as ischemic control group (G-C). Eleven rats of G-E and 8 of G-C were followed for blood urea nitrogen and creatinine determinations before renal ischemia and at 1, 4 and 7 postoperative days. Samplings of left renal tissue were obtained at 5 minutes (5 rats from each group) and 24 hours (9 G-C and 10 of G-E) of reperfusion for malondialdehy (MDA) content determination. Controls of renal MDA content were determined in kidneys harvested from 6 additional normal rats. Results: Acute renal failure occurred in all animals but levels of BUN and creatinine were significantly lower in G-E (p<0.001). MDA content rose strikingly at 5 minutes of reperfusion in both groups (p>0.05) and returned near to normal levels 24 hours later. Conclusion: CPZ conferred partial protection of renal function to kidneys submitted to ischemia/reperfusion injury that seems to be not dependent on inhibition of lipid peroxidation.