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Modification of cisplatin-induced renal p-aminohippurate uptake alteration and lipid peroxidation by thiols, Ginkgo biloba extract, deferoxamine and torbafylline.

Author

Inselmann G, Blohmer A, Kottny W, Nellessen U, Hanel H, Heidemann HT

Date

1995

Journal

Nephron

Abstract

To determine whether inhibition of lipid peroxidation modifies cisplatin-induced changes of renal p-aminohippurate (PAH) uptake, we examined the effects of various radical scavengers and torbafylline on cisplatin-induced lipid peroxidation and PAH accumulation changes in rat renal cortical slices. Renal cortical slices were incubated with different cisplatin concentrations (0.3, 0.6, 1.0 mg/ml) in the presence of either glutathione, N-acetylcysteine, the iron chelator deferoxamine, Ginkgo biloba extract or the xanthine derivate torbafylline. Lipid peroxidation monitored as the production of malondialdehyde (MDA) was stimulated by increasing cisplatin concentrations in a dose-related manner. At a cisplatin concentration of 1.0 mg/ml, MDA production was twofold compared to controls (0.69 +/- 0.06 vs. 1.36 +/- 0.07 nmol/mg; p < 0.05). In turn, cisplatin decreased PAH uptake of kidney slices dose-dependently from 13.3 +/- 1.3 to 2.6 +/- 0.2 (p < 0.01). All agents tested inhibited cisplatin-induced lipid peroxidation; however, at a cisplatin concentration of 1.0 mg/ml, none of them prevented the decline of cisplatin-induced PAH uptake. Of the agents tested, deferoxamine proved to be the most effective antioxidant, completely inhibiting cisplatin-induced lipid peroxidation but in contrast preventing the decrease in PAH uptake only at a cisplatin concentration of 0.3 mg/ml. No strict association between lipid peroxidation and decline of PAH uptake was found, suggesting that lipid peroxidation may only in part participate in cisplatin-induced alterations of PAH uptake.

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