Abstract
Renal ischemia is of clinical interest because of its role in renal failure and also renal graft rejection. To evaluate the effect of the combination of N-acetylcysteine (NAC), a potent antioxidant, sodium nitroprusside (SNP), a nitric oxide donor, and phosphoramidon (P), an endothelin converting enzyme inhibitor, on tissue protection against ischemia-reperfusion injury, we studied the biochemical and morphological changes due to 90 min of renal ischemia-reperfusion in the rat model. Ninety min of ischemia caused very severe injury and the animals could not survive after 4 days without any treatment. Whereas, animals in the treated groups survived i.e. the NAC group (25%), NAC + SNP group (43%) and in the NAC + SNP + P group (100%), 2 weeks after 90 min of ischemia. A significant increase in the serum levels of creatinine and urea nitrogen was shown in the untreated group and to a much lesser extent in the treated group, especially in the NAC + SNP + P group. The protective effect was also supported by light microscopic studies on renal tissue sections. We also measured the activities of antioxidant enzymes in tissue homogenates. With the exception of Mn-superoxide dismutase, the activities of antioxidant enzymes (catalase, glutathione peroxidase, CuZn-superoxide dismutase) were decreased in the untreated kidney. The administration of NAC alone and NAC + SNP protected against the loss of activities. Treatment with a combination of NAC, SNP and P showed a synergistic effect as evidenced by the best protection. These results suggest that pre-administration of a combination of antioxidant (NAC) with endothelin derived vasodilators (sodium nitroprusside and Phosphoramidon) attenuates renal ischemia-reperfusion injury, e.g. in donor kidney for transplantation, by protecting cells against free radical damage.
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Dobashi, K., Singh, I., Orak, J.K. et al. Combination therapy of N-acetylcysteine, sodium nitroprusside and phosphoramidon attenuates ischemia-reperfusion injury in rat kidney. Mol Cell Biochem 240, 9–17 (2002). https://doi.org/10.1023/A:1020629020443
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DOI: https://doi.org/10.1023/A:1020629020443