期刊
NEUROTOXICOLOGY
卷 22, 期 6, 页码 743-753出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0161-813X(01)00058-4
关键词
sodium channel; dihydropyrazole; RH-3421; tetrodotoxin-resistant sodium channel; dorsal root ganglion
资金
- NINDS NIH HHS [NS14143] Funding Source: Medline
The effects of the dihydropyrazole insecticide RH-3421 on the tetrodotoxin-resistant (M-R) voltage-gated sodium channels in rat dorsal root ganglion (DRG) neurons were studied using the whole-cell patch clamp technique. RH-3421 at 10 nM to 1 muM completely blocked action potentials. The sodium currents were irreversibly suppressed by 1 muM RH-3421 in a time- and a dose-dependent manner and the IC50 value of RH-3421 was estimated to be 0.7 muM after 10 min of application. RH-3421 blocked the sodium currents to the same extent over the entire range of test potentials. The sodium conductance-voltage curve was not shifted along the voltage axis by 1 muM RH-3421 application. In contrast, both fast and slow steady-state sodium channel inactivation curves were shifted in the hyperpolarizing direction in the presence of 1 muM RH-3421. It was concluded that RH-3421 bound to the resting and inactivated sodium channels to cause block with a higher affinity for the latter state. (C) 2001 Elsevier Science Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据