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- W2005403211 abstract "The tritium recovery assay of 9-hydroxyprostaglandin dehydrogenase [Pace-Asciak, C. (1975) J. Biol. Chem.250, 2789] has been modified to ensure its applicability to both crude and purified enzyme preparations. The stereospecificity of NAD+-dependent 9-hydroxyprostaglandin dehydrogenase with respect to NAD+ was determined first and found to be A-side specific. Based on the stereospecificity of the enzyme, a simple and sensitive assay method for 9-hydroxyprostaglandin dehydrogenase has been developed. The assay is able to detect picomole quantities of substrate conversion. When 15-keto-13,14-dihydro-[9β-3H]PGF2α is employed as substrate, the tritium label of the tritiated prostaglandin is effected to transfer to lactate stereospecifically by coupling 9-hydroxyprostaglandin dehydrogenase with a saturating level of lactate dehydrogenase. The amount of prostaglandin oxidized is quantitated by the radioactivity of the labeled lactate produced, which is separated from labeled prostaglandin by charcoal precipitation. Simultaneous assays with the current tritium-release and thin-layer chromatography methods indicated excellent correlation. Using this method we have found that rat kidney possesses the highest enzyme activity among those tissues examined. Rat kidney enzyme activity is linear for the first 10 min it is studied and is nonlinear with increasing amounts of crude enzyme extract, indicating the possible presence of endogenous inhibitor(s). The apparent Km for 15-keto-13,14-dihydro-PGF2α is 0.66 μm. The enzyme is activated by imipramine, inhibited by indomethacin, but not affected by furosemide and ethacrynic acid. These results confirm previous findings reported in the literature." @default.
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- W2005403211 title "A simple and sensitive assay for 9-hydroxyprostaglandin dehydrogenase" @default.
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- W2005403211 doi "https://doi.org/10.1016/0003-2697(77)90102-6" @default.
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