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Departments of 1 Medicine, 2 Surgery, and 3 Pathology, University of Colorado Health Sciences Center, Denver, Colorado 80262
Renal ischemia-reperfusion (I/R) injury was investigated in inducible nitric oxide synthase (iNOS) knockout mice. After a 26-min bilateral renal pedicle clamp, serum creatinine concentrations (in mg/dl) in wild-type mice after a 24-h reperfusion were 0.25 ± 0.03 in sham-operated controls and 2.3 ± 0.38 in ischemic mice (P < 0.01); after 48 h, concentrations (in mg/dl) were 0.25 ± 0.03 in controls and 2.0 ± 0.18 in ischemic mice (P < 0.01). iNOS knockout mice demonstrated an attenuation of serum creatinine concentration after renal I/R injury. Serum creatinine concentrations (mg/dl) after a 24-h reperfusion were 2.3 ± 0.22 in wild-type ischemic and 1.21 ± 0.25 in iNOS knockout ischemic mice (P < 0.05); after 48 h, concentrations were 2.0 ± 0.18 in wild-type ischemic and 0.96 ± 0.25 in iNOS knockout ischemic mice (P < 0.01). Histological scoring of acute tubular necrosis in iNOS knockout mice was decreased compared with that in wild-type controls (0.88 ± 0.2 vs. 3.3 ± 0.3, P < 0.05). iNOS protein in the renal cortex of wild-type mice subjected to renal I/R injury was undetectable up to 48 h. However, a strong upregulation of heat shock protein 72 expression was observed in renal cortex of iNOS knockout mice under basal conditions. In conclusion, kidneys of iNOS knockout mice were protected against ischemic acute renal failure. This protective effect may be related to a compensatory upregulation of heat shock protein 72.
acute renal failure; heat shock protein; serum creatinine
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