Trapping and dissociation of propafenone derivatives in HERG channels

被引:24
|
作者
Windisch, A.
Timin, E. N.
Schwarz, T. [2 ]
Stork-Riedler, D.
Erker, T. [2 ]
Ecker, G. F. [2 ]
Hering, S. [1 ]
机构
[1] Univ Vienna, Inst Pharmacol, Dept Pharmacol & Toxicol, A-1090 Vienna, Austria
[2] Univ Vienna, Dept Med Chem, A-1090 Vienna, Austria
基金
奥地利科学基金会;
关键词
arrhythmia; drug trapping; HERG; K-channels; propafenone; QT syndrome; voltage clamp; Xenopus oocyte; ANTI-ARRHYTHMIC DRUGS; MOLECULAR DETERMINANTS; POTASSIUM CHANNELS; XENOPUS OOCYTES; CARDIAC-ARRHYTHMIA; LOCAL-ANESTHETICS; STRUCTURAL BASIS; DEPENDENT BLOCK; K+ CHANNELS; I-KR;
D O I
10.1111/j.1476-5381.2010.01159.x
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
BACKGROUND AND PURPOSE Human ether-a-go-go related gene (HERG) channel inhibitors may be subdivided into compounds that are trapped in the closed channel conformation and others that dissociate at rest. The structural peculiarities promoting resting state dissociation from HERG channels are currently unknown. A small molecule-like propafenone is efficiently trapped in the closed HERG channel conformation. The aim of this study was to identify structural moieties that would promote dissociation of propafenone derivatives. EXPERIMENTAL APPROACH Human ether-a-go-go related gene channels were heterologously expressed in Xenopus oocytes and potassium currents were recorded using the two-microelectrode voltage clamp technique. Recovery from block by 10 propafenone derivatives with variable side chains, but a conserved putative pharmacophore, was analysed. KEY RESULTS We have identified structural determinants of propafenone derivatives that enable drug dissociation from the closed channel state. Propafenone and four derivatives with 'short' side chains were trapped in the closed channel. Five out of six bulky derivatives efficiently dissociated from the channel at rest. One propafenone derivative with a similar bulk but lacking an H-bond acceptor in this region was trapped. Correlations were observed between molecular weight and onset of channel block as well as between pK(a) and recovery at rest. CONCLUSION AND IMPLICATIONS The data show that extending the size of a trapped HERG blocker-like propafenone by adding a bulky side chain may impede channel closure and thereby facilitate drug dissociation at rest. The presence of an H-bond acceptor in the bulky side chain is, however, essential.
引用
收藏
页码:1542 / 1552
页数:11
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