| Assay Method Information | |
| | Study with Mouse and Human Intestinal Tissue Homogenates |
| Description: | The aim of this study was to evaluate TK-112690 in vivo as an inhibitor of uridine phosphorylase (UPase) enzyme activity. The range of TK-112690 doses studied for ability to prevent metabolic breakdown of uridine, through the in vitro inhibition of mouse and human small intestinal UPase enzyme, was 0, 0.1, 0.5, 1, 5, 10, 50, 100, 500, 1000, 5000 and 10000 μM). Detection of UPase activity was determined by HPLC analysis using UV detection of uracil concentration (UPase catabolizes uridine into uracil and ribose-1-phosphate).The UPase enzyme material was prepared from homogenized mouse and human being small intestinal tissue. TK-112690 was dissolved in water (50 mg/ml) and analyzed for UPase inhibition in aqueous solution containing 5 mM uridine, 0.01 M Tris, 0.01 M phosphate, 1 mM EDTA, and 1 mM DTT. Reactions were performed at 37° C. at pH of 7.3.TK-11260 inhibition of mouse and human UPase was analyzed by reverse phase HPLC using UV detection. HPLC analysis was performed at ambient temperature with a Water 2695 Alliance system equipped with a C18 ECONOSIL 5 U ALLtech column. 20 μl of UPase reaction samples were auto-injected onto column. Mobile phase consisted of water eluting for first 2.5 ml and acetonitrile gradient to 100% in 12.5 ml (flow rate 0.5 ml/min). The outlet fluent was monitored by UV absorption in the range of 240-320 nm. UPase enzymatic activity was based on the AUC of the uracil peaks. |
| Affinity data for this assay | |
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