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  • Title: Effects of candesartan cilexetil on oxidative state and renal function in 5/6 nephrectomized rats.
    Author: Sugimoto K, Tsuruoka S, Matsushita K, Fujimura A.
    Journal: J Hum Hypertens; 1999 Jan; 13 Suppl 1():S63-70; discussion S81. PubMed ID: 10076923.
    Abstract:
    We have investigated the influence of a novel angiotensin II type 1 receptor antagonist, candesartan cilexetil, on the oxidative state of renal tissue and renal function in 5/6 nephrectomized rats, and compared its effects with those of an angiotensin-converting enzyme inhibitor, enalapril. Candesartan cilexetil (1 and 5 mg/kg per day), enalapril (5 mg/kg per day) and vehicle were orally administered once daily for 16 weeks after 5/6 nephrectomy. There was a marked degree of proteinuria evident prior to treatment, an average of 5.69 mg/mg creatinine in the nephrectomized rats, vs 1 to 2 mg/mg creatinine in the control group matched for species and body weight. Inhibition of development of proteinuria by candesartan cilexetil was dose dependent. Enalapril also significantly blunted the rise in urinary protein. Malondi-aldehyde content in the homogenate from the renal cortex increased significantly in the nephrectomized rats compared to control animals. This elevation of malondi-aldehyde content was unaffected by administration of either candesartan cilexetil or enalapril. Antioxidative enzyme (glutathione peroxidase, superoxide dismutase, and catalase) activities in the renal tissue were not affected by any active treatment. Elevation of lipid peroxide in remnant renal tissue suggests that oxidative stress may contribute to the progression of renal injury in the nephrectomized rats. Neither candesartan cilexetil nor enalapril affected antioxidant defenses in renal tissue in nephrectomized rats, indicating that mechanisms other than alteration in oxidative stress are involved in the renoprotective effects of candesartan cilexetil and enalapril.
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