Synthesis and pharmacological characterization of novel fluorescent histamine H2-receptor ligands derived from aminopotentidine

被引:18
|
作者
Xie, Sheng-Xue
Petrache, Georgiana
Schneider, Erich
Ye, Qi-Zhuang
Bernhardt, Guenther
Seifert, Roland
Buschauer, Armin [1 ]
机构
[1] Univ Regensburg, Inst Pharm, D-93040 Regensburg, Germany
[2] Univ Kansas, High Throughput Screening Lab, Lawrence, KS 66045 USA
[3] Univ Kansas, Dept Pharmacol & Toxicol, Lawrence, KS 66045 USA
关键词
fluorescent probes; cyanine; BODIPY; histamine H-2-receptor agonist; GTPase assay;
D O I
10.1016/j.bmcl.2006.05.039
中图分类号
R914 [药物化学];
学科分类号
100701 ;
摘要
In an effort to develop a non-radioactive alternative to the [H-3]tiotidine and [I-125] iodoaminopotentidine binding assays for the histamine H-2-receptor (H2R), primary amines related to aminopotentidine were prepared and coupled with the succinimidyl esters of the bulky fluorescent dyes S0536 and BODIPY (R) 650/665-X. The primary amines exhibited different degrees of antagonistic potency at the human and guinea pig H2R. Surprisingly, one compound (5) coupled to the cyanine dye S0536 acted as potent partial agonist/antagonist at the H2R (K-B similar to 50 nM; EC50 similar to 100-150 nM). Compounds coupled to the BODIPY dye exhibited moderately high H2R-affinity, too. Thus, the H2R accommodates bulky fluorophores, probably through interaction with extracellular receptor domains. The compounds presented herein provide a starting point for the optimization of fluorescent H2R ligands with respect to affinity and fluorescence as valuable tools to analyze the molecular mechanisms of H2R activation. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3886 / 3890
页数:5
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