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Abstract
Sulfinpyrazone, a potent uricosuric drug, was tested in vitro for its scavenging action against oxygen free radicals. In this study, sulfinpyrazone was able to scavenge 1,1-diphenyl-2-picrylhydrazyl radical with IC 50 value of 29.82 w g/ml compared to butylated hydroxytoluene (BHT, IC 50 value=20.15 w g/ml) and Trolox (IC 50 value=16.01 w g/ml). It was able to scavenge superoxide anion with IC 50 value of 27.72 w g/ml compared to Trolox (IC 50 value=22.08 w g/ml) and ascorbic acid (IC 50 value=14.65 w g/ml). The hydroxyl radical scavenging activity of sulfinpyrazone is in a concentration-dependent fashion. In the range of concentrations used, sulfinpyrazone was not a scavenger toward H 2 O 2 . However, the intracellular H 2 O 2 -induced 2',7'-dichlorofluorescin diacetate (DCF-DA) fluorescence in HL-60 cells was significantly reduced by sulfinpyrazone during 30-60 min of incubation. Finally, phorbol-12-myristate-13-acetate induced-lucigenin chemiluminescence in whole blood was markedly inhibited by sulfinpyrazone. Our results suggest a new direction for the pharmacological actions of sulfinpyrazone in free radical scavenging properties.