Novel halogenated nitrobenzylthioinosine analogs as es nucleoside transporter inhibitors
作者:Amol Gupte、John K Buolamwini
DOI:10.1016/j.bmcl.2004.02.016
日期:2004.5
Nucleoside transporter inhibitors have potential therapeutic applications as anticancer, antiviral, cardioprotective, and neuroprotective agents. We have synthesized and flow cytometrically evaluated the binding affinity of a series of novel halogenated nitrobenzylthioinosine analogs at the human es nucleoside transporter. Structure-activity relationships indicate the importance of hydrophobicity and electron withdrawing capacity of substituents at the para-position of the 6-position benzyl substituent. All of the compounds showed high binding affinity as shown by their ability to displace the fluorescent es transporter ligand, SAENTA-X8-fluorescein. Compound 16 (6-S-(para-iodobenzyl)-6-thioinosine) was the most tightly bound within the series with a K-i of 3.88 nM (NBMPR exhibited a K-i of 0.70 nM). This compound has higher affinity than the widely used nonnucleoside, nucleoside transport inhibitor, dipyridamole (K-i = 8.79 nM), and may serve as a new lead compound. (C) 2004 Elsevier Ltd. All rights reserved.