Assay for detecting inhibitors of the enzyme myeloperoxidase

Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving oxidoreductase

Reexamination Certificate

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Reexamination Certificate

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07108997

ABSTRACT:
The invention is an assay for detecting inhibitors of the enzyme myeloperoxdase The assay method comprises reacting myeloperoxdase with hydrogen peroxide and a chloride source to generate hypochlorous acid in the presence of a potential inhibitor of said myeloperoxidase; reacting any formed hypochlorous acid with an amine to form the corresponding chloramino; optionally removing any unreacted hydrogen peroxide; reacting any for-med chloramine with a detector compound in the presence of iodide to form oxidized detector compound; determining the amount of formed oxidized detector compound by measuring the absorbents or fluorescence at a suitable wavelength; and identifying as inhibitors of myeloperoxidase those compounds which cause the amount of formed oxidized detector compound to be decreased The assay is useful in diagnostic tests for myeloperoxidase activity.

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Bozeman et al., “Inhibition of the Human Leukocyte Enzymes Myeloperoxidase and Eosinophil Peroxidase by Dapsone”, Biochem. Pharmacol. 44, 553-563 (1992).
Akbiyik et al., “In vitro and in vivo inhibition of myeloperoxidase with 5-fluorouracil,” Eur. J. Clin. Pharmacol. 57, 631-636 (2001).
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