作者:Sumaira Javaid、Syed Muhammad Saad、Shahnaz Perveen、Khalid Mohammed Khan、M. Iqbal Choudhary
DOI:10.1016/j.bioorg.2015.10.006
日期:2015.12
Thymidine phosphorylase (TP) over expression plays an important role in several pathological conditions, such as rheumatoid arthritis, chronic inflammatory diseases, psoriasis, and tumor angiogenesis. In this regard, a series of twenty-five 2-arylquinazolin-4(3H)-one derivatives 1-25 were evaluated for thymidine phosphorylase inhibitory activity. Six compounds 5, 6, 20, 2, 23, and 3 were found to be active against thymidine phosphorylase enzyme with IC50 values in the range of 42.9-294.6 mu M. 7-Deazaxanthine (IC50 = 41.0 +/- 1.63 mu M) was used as a standard inhibitor. Compound 5 showed a significant activity (IC50 = 42.9 +/- 1.0 mu M), comparable to the standard. The enzyme kinetic studies on the most active compounds 5, 6, and 20 were performed for the determination of their modes of inhibition, and dissociation constants K-i. All active compounds were found to be largely non-cytotoxic against the mouse fibroblast 3T3 cell line. This study identifies a novel class of thymidine phosphorylase inhibitors which may be further investigated as leads to develop therapeutic agents. (C) 2015 Elsevier Inc. All rights reserved.