Nephropathy in Zucker diabetic fat rat is associated with oxidative and nitrosative stress: prevention by chronic therapy with a peroxynitrite scavenger ebselen

Journal of the American Society of Nephrology : JASN
Praveen N ChanderMichael S Goligorsky

Abstract

Zucker diabetic fat (ZDF) rats with the metabolic syndrome and hyperlipidemia develop focal and segmental sclerosis. The role of oxidative and nitrosative stress in the nephropathy in ZDF was studied. Renal histology, function, and immunohistologic and biochemical parameters of oxidative and nitrosative stress were evaluated at 8 and 22 wk of age in ZDF and Zucker lean (ZL) rats and after chronic treatment with ebselen, an antioxidant and peroxinitrite scavenger. At 8 wk, ZDF rats showed hyperglycemia, no proteinuria or nephropathy, but higher levels of dihydrobiopterin and 3-nitrotyrosine (3-NT)-modified proteins compared with age-matched ZL rats. At 22 wk, ZDF rats developed focal and segmental sclerosis, proteinuria, decreased creatinine clearance, and renal tissue levels of glutathione and tetrahydrobiopterin with further elevation in dihydrobiopterin and 3-NT-modified proteins, in contrast to age-matched ZL rats. Renal immunohistologic expression of lipid peroxidation products and 3-NT-modified proteins also increased in 22-wk-old ZDF but not in ZL rats. Chronic ebselen treatment of ZDF rats restored renal tissue levels of glutathione and tetrahydrobiopterin; prevented significant accumulation of dihydrobiopterin, lipid pe...Continue Reading

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