块HERG钾离子通道的抗组胺剂阿司咪唑及其代谢物desmethylastemizole norastemizole。
文章的细节
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引用
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张周Z, Vorperian VR,龚Q,年代,一月CT
块HERG钾离子通道的抗组胺剂阿司咪唑及其代谢物desmethylastemizole norastemizole。
J Cardiovasc Electrophysiol。1999年6月,10 (6):836 - 43。
- PubMed ID
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10376921 (在PubMed]
- 文摘
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作品简介:选择性H1-receptor拮抗剂阿司咪唑(Hismanal)导致了长QT综合症。阿司咪唑块快速激活延迟整流K +电流我(Kr)和人类ether-a go-go-related基因(HERG) K +通道构成。阿司咪唑也迅速代谢。保留的主要代谢物是desmethylastemizole H1-receptor拮抗剂性质,有长时间消除9到13天,及其稳态血清浓度超过阿司咪唑的30倍以上。第二个代谢物是norastemizole,在低浓度血清阿司咪唑摄入后,经历了发展作为一种新的抗组胺剂药物。我们的目标在当前工作是研究desmethylastemizole的影响,norastemizole,阿司咪唑HERG K +通道。方法和结果:HERG通道表达哺乳动物(HEK 293)细胞株,研究使用膜片钳技术。Desmethylastemizole和阿司咪唑HERG电流与类似的浓度依赖性(half-maximal块分别为1.0和0.9 nM)和块使用的依赖。Norastemizole也封锁HERG电流;然而,块是不完整的,需要较高的药物浓度(half-maximal块27.7海里)。 CONCLUSIONS: Desmethylastemizole and astemizole cause equipotent block of HERG channels, and these are among the most potent HERG channel antagonists yet studied. Because desmethylastemizole becomes the dominant compound in serum, these findings support the postulate that it becomes the principal cause of long QT syndrome observed in patients following astemizole ingestion. Norastemizole block of HERG channels is weaker; thus, the risk of producing ventricular arrhythmias may be lower. These findings underscore the potential roles of some H1-receptor antagonist metabolites as K+ channel antagonists.
DrugBank数据引用了这篇文章
- 药物靶点
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药物 目标 类 生物 药理作用 行动 阿司咪唑 电压门控钾通道亚科2 H成员 蛋白质 人类 未知的抑制剂细节 Tecastemizole 电压门控钾通道亚科2 H成员 蛋白质 人类 未知的不可用 细节