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Vol. 35, No. 1, 2012
Issue release date: January 2012
Am J Nephrol 2012;35:80–89

Effects of Short- and Long-Term Hypercholesterolemia on Contrast-Induced Acute Kidney Injury

Yang D. · Lin S. · Yang D. · Wei L. · Shang W.
aDivision of Nephrology, Department of Medicine, General Hospital of Tianjin Medical University, Tianjin, and bDivision of Nephrology, Department of Medicine, Renmin Hospital of Wuhan University, Wuhan, China

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Background: Whether hypercholesterolemia is a risk factor for contrast-induced acute kidney injury (CI-AKI) remains unclear. In the present study, the effects of short- and long-term dietary hypercholesterolemia on contrast media-induced nephrotoxicity were evaluated. Methods: Rats were fed either a normal rodent diet (N) or high-cholesterol diet (H). At the end of 2 and 8 weeks, 8 rats from each diet group were given a tail vein injection of either iohexol (group NC and group HC) or vehicle (group N and group H). Blood lipids, renal function and renal hemodynamics were evaluated 1 day after contrast media administration. Renal and urinary prostaglandin E2 (PGE2) and thromboxane B2 (TXB2) were detected by radioimmunoassay. Renal nitric oxide and malondialdehyde (MDA) were measured by the Griess reaction and thiobarbituric acid method, respectively. Results: Contrast media administration increased serum creatinine levels and induced severe renal tubular necrosis in rats fed the high-cholesterol diet for 8 weeks but not in rats fed the normal diet or high-cholesterol diet for 2 weeks. The renal and urinary PGE2 and TXB2 levels increased significantly in rats in group H and group HC at the end of 8 weeks. Renal nitric oxide production decreased, and MDA levels increased markedly in group HC and group H at the end of 8 weeks. Conclusions: We conclude that long-term hypercholesterolemia appeared to be a risk factor for CI-AKI, which might be associated with disorders in intrarenal prostaglandins and abnormalities in renal nitric oxide system induced by lipid peroxidation.

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