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首页> 外文期刊>Reproductive toxicology >Improved methodology for identifying the teratogenic potential in early drug development of hERG channel blocking drugs.
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Improved methodology for identifying the teratogenic potential in early drug development of hERG channel blocking drugs.

机译:鉴定hERG通道阻滞药物早期药物开发中致畸潜力的改进方法。

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摘要

Drugs blocking the potassium current IKr of the heart (via hERG channel-inhibition) have the potential to cause hypoxia-related teratogenic effects. However, this activity may be missed in conventional teratology studies because repeat dosing may cause resorptions. The aim of the present study was to investigate an alternative protocol to reveal the teratogenic potential of IKr-blocking drugs. The IKr blocker astemizole, given as a single dose (80 mg/kg) on gestation day (GD) 13 to pregnant rats caused digital defects. In whole rat embryo culture (2h) on GD 13, astemizole caused a decrease in embryonic heart rate at 20 nM, and arrhythmias at 200-400 nM. Cetirizine, without IKr-blocking properties, did not affect the rat embryonic heart in vitro. The present study shows that single dose testing on sensitive days of development, together with whole embryo culture, can be a useful methodology to better characterize the teratogenic potential of IKr-blocking drugs.
机译:阻断心脏钾电流IKr(通过hERG通道抑制)的药物有可能引起与缺氧相关的致畸作用。但是,由于重复给药可能导致吸收,因此在传统的畸形学研究中可能会错过这种活性。本研究的目的是研究一种替代方案,以揭示IKr阻断药的致畸潜力。孕期(GD)第13天给怀孕大鼠单剂量(80 mg / kg)的IKr阻滞剂阿司咪唑引起了数位缺陷。在GD 13上进行的全大鼠胚胎培养(2h)中,阿司咪唑在20 nM时引起胚胎心率降低,在200-400 nM时引起心律不齐。西替利嗪没有IKr阻滞特性,在体外不影响大鼠胚胎心脏。本研究表明,在敏感发育日进行单剂量测试以及整个胚胎培养可作为一种有用的方法,以更好地表征IKr阻断药的致畸潜力。

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