AIM: To investigate the protective effect of paricalcitol and enalapril on renal inflammation and oxidative stress in Apo E-knock out mice. METHODS: Animals treated for 4 mo as group(1) Apo E-knock out plus vehicle, group(2) Apo E-knock out plus paricalcitol(200 ng thrice a week),(3) Apo Eknock out plus enalapril(30 mg/L),(4) Apo E-knock out plus paricalcitol plus enalapril and(5) normal. Blood pressure(BP) was recorded using tail cuff method. The kidneys were isolated for biochemical assays using spectrophotometer and Western blot analyses. RESULTS: Apo E-deficient mice developed high BP(127 ± 3 mm Hg) and it was ameliorated by enalapril and enalapril plus paricalcitol treatments but not with paricalcitol alone. Renal malondialdehyde concentrations, p22 phox, manganese-superoxide dismutase, inducible nitric oxide synthase(NOS), monocyte chemoattractant protein-1, tumor necrosis factor-alpha and transforming growth factor-β1 levels significantly elevated but reduced glutathione, Cu Zn-SOD and e NOS levels significantly depleted in Apo E-knock out animals compared to normal. Administration of paricalcitol, enalapril and combined together ameliorated the renal inflammation and oxidative stress in Apo E-knock out animals. CONCLUSION: Paricalcitol and enalapril combo treatment ameliorates renal inflammation as well as oxidative stress in atherosclerotic animals. AIM: To investigate the protective effect of paricalcitol and enalapril on renal inflammation and oxidative stress in Apo E-knock out mice. METHODS: Animals treated for 4 mo as group (1) Apo E-knock out plus vehicle, group (2) Apo (3) Apo Eknock out plus enalapril (30 mg / L), (4) Apo E-knockout plus paricalcitol plus enalapril and (5) normal. Blood pressure (200 ng thrice a week) BP) was recorded using tail cuff method. The kidneys were isolated for biochemical assays using spectrophotometer and Western blot analyzes. RESULTS: Apo E-deficient mice developed high BP (127 ± 3 mm Hg) and it was ameliorated by enalapril and enalapril plus paricalcitol treatments but not with paricalcitol alone. Renal malondialdehyde concentrations, p22 phox, manganese-superoxide dismutase, inducible nitric oxide synthase (NOS), monocyte chemoattractant protein-1, tumor necrosis factor-alpha and transforming growth factor- β1 levels significantly elevated but reduced glutathione , Cu Z Administration of paricalcitol, enalapril and combined together ameliorated the renal inflammation and oxidative stress in Apo E-knockout animals. CONCLUSION: Paricalcitol and enalapril combo treatment ameliorates renal inflammation as well as oxidative stress in atherosclerotic animals.