期刊
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
卷 65, 期 -, 页码 1-11出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ejmech.2013.03.063
关键词
Pyrazolo[1,5-a][1,3,5]triazines; Thymidine phosphorylase; Enzyme inhibitor
资金
- National Medical Research Council, Singapore [R-148-000-102-275]
Thymidine phosphorylase (TP) is an enzyme that promotes tumor growth and metastasis and therefore is an attractive druggable target. Using a reported TP inhibitor, 7-deazaxanthine (7DX), as the lead compound; this study was set up to evaluate whether pyrazolo[1,5-a][1,3,5]triazin-2,4-diones and pyrazolo[1,5-a][1,3,5]triazin-2-thioxo-4-ones would exhibit TP inhibitory activity. The pyrazolo[1,5-a][1,3,5] triazine nucleus was constructed using a reaction that annulated the 1,3,5-triazine ring onto a pyrazole scaffold. Among the 52 compounds synthesized and tested, it was found that 1,3-dihydro-pyrazolo[1,5-a][1,3,5]triazin-2-thioxo-4-ones exhibited various extent of inhibitory activity against TP. The best compound 17p, which bears a para-substituted pentafluorosulfur group, showed an IC50 value of 0.04 mu M, which was around 800 times more potent than the 7DX (IC50 = 32 mu M) under the same bioassay conditions. The results of the study suggested that a substituent with +sigma and +pi properties inserted at position 4 of a phenyl ring that is attached to position 8 of the pyrazolo[1,5-a][1,3,5]triazin-2-thioxo-4-one scaffold would give excellent TP inhibitory action. In addition, 17p was found to be a non-competitive inhibitor thus suggested that it might interact with TP at a position different from the substrate binding site. (C) 2013 Elsevier Masson SAS. All rights reserved.
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