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首页> 外文期刊>The Journal of Clinical Pharmacology: Official Journal of the American College of Clinical Pharmacology >Progesterone Metabolites Inhibit the Human Ether-a-go-go-Related Gene and Predict QT Interval Length
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Progesterone Metabolites Inhibit the Human Ether-a-go-go-Related Gene and Predict QT Interval Length

机译:黄体酮代谢物抑制人醚 - a-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-go-geach

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摘要

A decrease in the human ether-a-go-go-related gene (hERG/KCNH2)-related channel has been linked to intrauterine fetal death. The formation of cytochrome P450 (CYP) 3A-mediated progesterone metabolites, 6-beta-hydroxy-progesterone (6 beta-OHP) and 16 alpha-hydroxy-progesterone (16 alpha-OHP), is variable among adults and differs from fetal metabolism. The primary objective of this study was to assess the potential for progesterone metabolites to inhibit hERG-related current and predict QTc intervals. Whole-cell voltage-clamp electrophysiology was performed on human embryonic kidney 293 cells stably expressing hERG exposed to progesterone or metabolites. Both 6 beta-OHP and 16 alpha-OHP positively shifted the voltage dependence of activation relative to vehicle from -4.0 +/- 0.8 to -0.3 +/- 0.8 mV, P < .01; and 1.0 +/- 0.6 mV, P < .01, respectively. In addition, 6 beta-OHP decreased maximal outward tail currents from 49.4 +/- 4.9 to 32.5 +/- 4.1 pA/pF, P < 0.01, and reduced the expression of fully glycosylated hERG by 42%. Healthy female subjects were administered progesterone 400 mg orally for 7 days, ibutilide 0.003 mg/kg was infused, and serial electrocardiograms and blood samples collected. Relationships between rate-corrected QT intervals (QTcI) with circulating hormones and metabolites were assessed. The 6 beta-OHP and 16 alpha-OHP metabolites were independent predictors of QTcI intervals prior to and following ibutilide administration. In conclusion, the progesterone metabolites formed via CYP3A cause inhibitory effects on hERG channels and predict QTcI intervals in healthy women pretreated with progesterone. Further study into maternal and fetal exposure to these metabolites and potential to prolong cardiac repolarization is warranted.
机译:人类乙醚相关基因(hERG/KCNH2)相关通道的减少与宫内胎儿死亡有关。细胞色素P450(CYP)3A介导的孕酮代谢产物6-β-羟基孕酮(6-β-OHP)和16-α-羟基孕酮(16-α-OHP)的形成在成年人中是可变的,与胎儿代谢不同。本研究的主要目的是评估孕酮代谢物抑制hERG相关电流并预测QTc间期的可能性。对暴露于孕酮或代谢物的稳定表达hERG的人胚胎肾293细胞进行全细胞电压钳电生理研究。6-β-OHP和16-α-OHP均将激活相对于载体的电压依赖性从-4.0+/-0.8正移到-0.3+/-0.8 mV,P<0.01;和1.0+/-0.6 mV,P<0.01。此外,6β-OHP将最大外向尾电流从49.4+/-4.9降低至32.5+/-4.1 pA/pF,P<0.01,并将完全糖基化的hERG表达降低42%。健康女性受试者口服黄体酮400 mg,持续7天,注入伊布利特0.003 mg/kg,并采集一系列心电图和血样。评估了心率校正QT间期(QTcI)与循环激素和代谢物之间的关系。6β-OHP和16α-OHP代谢物是伊布利特给药前后QTcI间期的独立预测因子。总之,通过CYP3A形成的孕酮代谢物对经孕酮预处理的健康女性的hERG通道产生抑制作用,并预测QTcI间期。有必要对母体和胎儿暴露于这些代谢物以及延长心脏复极的可能性进行进一步研究。

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