Synthesis and<i>in vitro</i>Evaluation of 1,2,4-Triazolo[1,5-<i>a</i>][1,3,5]triazine Derivatives as Thymidine Phosphorylase Inhibitors
作者:Hriday Bera、Anton V. Dolzhenko、Lingyi Sun、Sayan Dutta Gupta、Wai-Keung Chui
DOI:10.1111/cbdd.12171
日期:2013.9
In our lead finding program, a series of 1,2,4‐triazolo[1,5‐a][1,3,5]triazine derivatives were synthesized, and their in vitro thymidine phosphorylase inhibitory potential was explored. Among the different derivatives, compounds having keto group (C = O) at C7 and thioketo group (C = S) at C5 positions showed varying degrees of TP inhibitory activity comparable with positive control, 7‐deazaxanthine (7‐DX, 2) (IC50 value = 42.63 μm). Enzyme inhibition kinetics study suggested that compound IVn behaved as a mixed‐type inhibitor of the enzyme with respect to thymidine (dThd) as a variable substrate. Compound IVn was also found to inhibit PMA‐induced MMP‐9 expression in MDA‐MB‐231 cells at sublethal concentrations. Computational docking study was performed to illustrate the enzyme inhibition kinetics and to explore the ligand–enzyme interactions.