دورية أكاديمية
Lidoflazine is a high affinity blocker of the HERG K(+)channel.
| العنوان: | Lidoflazine is a high affinity blocker of the HERG K(+)channel. |
|---|---|
| المؤلفون: | Ridley JM; Department of Physiology and Cardiovascular Research Laboratories, School of Medical Sciences, University Walk, Bristol BS8 1TD, United Kingdom., Dooley PC, Milnes JT, Witchel HJ, Hancox JC |
| المصدر: | Journal of molecular and cellular cardiology [J Mol Cell Cardiol] 2004 May; Vol. 36 (5), pp. 701-5. |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
| اللغة: | English |
| بيانات الدورية: | Publisher: Academic Press Country of Publication: England NLM ID: 0262322 Publication Model: Print Cited Medium: Print ISSN: 0022-2828 (Print) Linking ISSN: 00222828 NLM ISO Abbreviation: J Mol Cell Cardiol Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: London, New York, Academic Press. |
| مواضيع طبية MeSH: | Lidoflazine/*metabolism , Lidoflazine/*pharmacology , Potassium Channel Blockers/*metabolism , Potassium Channel Blockers/*pharmacology , Potassium Channels, Voltage-Gated/*antagonists & inhibitors , Potassium Channels, Voltage-Gated/*metabolism, Cell Line ; ERG1 Potassium Channel ; Electrophysiology ; Ether-A-Go-Go Potassium Channels ; Humans ; Lidoflazine/chemistry ; Mutation/genetics ; Phenylalanine/genetics ; Phenylalanine/metabolism ; Potassium Channel Blockers/chemistry ; Potassium Channels, Voltage-Gated/genetics ; Tyrosine/genetics ; Tyrosine/metabolism |
| مستخلص: | Lidoflazine is an antianginal calcium channel blocker that carries a significant risk of QT interval prolongation and ventricular arrhythmia. We investigated whether or not lidoflazine inhibits current through the rapid delayed rectifier K(+) channel alpha subunit (encoded by HERG - human ether-a-go-go-related gene), since this channel has been widely linked to drug-induced QT-prolongation. Lidoflazine inhibited potently HERG current (I(HERG)) recorded from HEK 293 cells stably expressing wild-type HERG (IC(50) of approximately 16 nM). It was approximately 13-fold more potent against HERG than was verapamil under similar conditions. On membrane depolarization, I(HERG) inhibition developed gradually, ruling out closed-channel state dependent inhibition. The effect of command voltage on the drug's action suggested that lidoflazine preferentially inhibits activated/open HERG channels. The S6 mutation Y652A largely eliminated the inhibitory action of lidoflazine, whilst the F656A mutation also reduced blocking potency. We conclude: first, that lidoflazine produces high affinity blockade of the alpha subunit of the HERG channel by binding to aromatic amino acid residues within the channel pore and, second, that this is likely to represent the molecular mechanism of QT interval prolongation by this drug. |
| المشرفين على المادة: | 0 (ERG1 Potassium Channel) 0 (Ether-A-Go-Go Potassium Channels) 0 (KCNH2 protein, human) 0 (Potassium Channel Blockers) 0 (Potassium Channels, Voltage-Gated) 42HK56048U (Tyrosine) 47E5O17Y3R (Phenylalanine) J4ZHN3HBTE (Lidoflazine) |
| تواريخ الأحداث: | Date Created: 20040512 Date Completed: 20041230 Latest Revision: 20161124 |
| رمز التحديث: | 20221213 |
| DOI: | 10.1016/j.yjmcc.2004.02.009 |
| PMID: | 15135665 |
| قاعدة البيانات: | MEDLINE |
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