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首页> 外文期刊>The Journal of toxicological sciences >Aromatase knockout mice reveal an impact of estrogen on drug-induced alternation of murine electrocardiography parameters
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Aromatase knockout mice reveal an impact of estrogen on drug-induced alternation of murine electrocardiography parameters

机译:芳香酶敲除小鼠揭示雌激素对药物诱发的鼠心电图参数改变的影响

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Our in vitro characterization showed that physiological concentrations of estrogen partially suppressed the I-Kr channel current in guinea pig ventricular myocytes and the human ether-a-go-go-related gene (hERG) channel currents in CHO-K1 cells regardless of estrogen receptor signaling and revealed that the partially suppressed hERG currents enhanced the sensitivity to the hERG blocker E-4031. To obtain in vivo proof-of-concept data to support the effects of estrogen on cardiac electrophysiology, we here employed an aromatase knockout mouse as an in vivo estrogen-null model and compared the acute effects of E-4031 on cardiac electrophysiological parameters with those in wild-type mice (C57/BL6J) by recording surface electrocardiogram (ECG). The ablation of circulating estrogens blunted the effects of E-4031 on heart rate and QT interval in mice under a denervation condition. Our result provides in vivo proof of principle and demonstrates that endogenous estrogens increase the sensitivity of E-4031 to cardiac electrophysiology.
机译:我们的体外研究表明,雌激素的生理浓度部分抑制了豚鼠心室肌​​细胞中的I-Kr通道电流和CHO-K1细胞中的人类以太相关基因(hERG)通道电流,而与雌激素受体无关信号,并显示部分抑制的hERG电流增强了对hERG阻断剂E-4031的敏感性。为了获得体内概念证明数据以支持雌激素对心脏电生理的影响,我们在这里采用芳香化酶敲除小鼠作为体内雌激素无效的模型,并比较了E-4031对心脏电生理参数的急性影响与那些通过记录表面心电图(ECG)在野生型小鼠(C57 / BL6J)中的表达。在去神经状态下,循环雌激素的消融减弱了E-4031对小鼠心率和QT间隔的影响。我们的结果提供了体内的原理证明,并证明内源性雌激素可提高E-4031对心脏电生理的敏感性。

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