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Rat kidney microsomes reduced cephaloridine when incubated anaerobically with NADPH. Superoxide anion was generated in a concentration- and time-dependent manner when cephaloridine was incubated with rat kidney microsomes. Cephaloridine increased the in vitro peroxidation of rat kidney microsomal lipids in a concentration- and time-dependent manner. Cephaloridine-induced lipid peroxidation was inhibited by a combination of superoxide dismutase and catalase, by the hydroxyl radical scavengers, mannitol, (+)-cyanidanol-3 and by the singlet oxygen scavenger histidine in a concentration-dependent manner. It is proposed that cephaloridine nephrotoxicity may occur through the transfer of an electron from reduced cephaloridine to oxygen and subsequent formation of the superoxide anion, hydrogen peroxide, the hydroxyl radical and singlet oxygen. These activated oxygen species then are very likely to react with membrane lipids to induce lipid peroxidation and nephrotoxicity.
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