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- W2027313453 abstract "Xanthine oxidase (XO) is a key enzyme that can catalyze the conversion of xanthine to uric acid, causing various diseases in humans. We have developed a high-throughput chip-based assay that uses a photodiode array (PDA) microchip system to explore the inhibitory effects of drug analogs on XO. Inhibitory activities of cyclosporin A, aminoglutethimide, dithranol and naringenin against XO were assessed using this chip-based xanthine assay in the presence or absence of the antioxidant enzyme, superoxide dismutase (SOD). In addition, the mechanism of drug action was also disclosed by monitoring the combined effect of respective drug analogs and SOD on XO in the assay. The assessment was based on the red light absorption property of nitroblue tetrazolium (NBT) formazan, formed by free radical-mediated NBT reduction. Compared to naringenin (50 and 100 microM; a known XO inhibitor), cyclosporin A (5 and 10 microM) exhibited similar XO inhibitory activity, whereas dithranol (1 and 3 microM) and aminoglutethimide (2.5 and 5mM) showed minimum XO inhibition. Low standard deviation obtained during the assay demonstrates the preciseness and accuracy of the developed approach. Compared to the existing methods, the developed approach is advantageous due to its simplicity and compatibility with high-throughput screening procedures. Furthermore, this approach can be applied to the early phase of drug discovery screening to explore various drug analogs for their XO inhibitory activities." @default.
- W2027313453 created "2016-06-24" @default.
- W2027313453 creator A5007252989 @default.
- W2027313453 creator A5009129081 @default.
- W2027313453 creator A5047143367 @default.
- W2027313453 date "2010-01-01" @default.
- W2027313453 modified "2023-10-18" @default.
- W2027313453 title "On-chip assay for determining the inhibitory effects and modes of action of drugs against xanthine oxidase" @default.
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- W2027313453 doi "https://doi.org/10.1016/j.jpba.2009.07.020" @default.
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