The alpha-like scorpion toxin bmk i enhances membrane excitability via persistent sodium current by preventing slow inactivation and deactivation of rnav1.2a expressed in xenopus oocytes
文献类型：期刊论文
| 作者 | Zhu, Mang-Mang2; Tan, Miao2; Cheng, Hui-Wen1; Ji, Yong-Hua1 |
| 刊名 | Toxicology in vitro
 |
| 出版日期 | 2009-06-01 |
| 卷号 | 23期号:4页码:561-568 |
| 关键词 | Alpha-like toxin Nav1.2 Persistent sodium current Membrane excitability Slow inactivation Deactivation |
| ISSN号 | 0887-2333 |
| DOI | 10.1016/j.tiv.2008.12.022 |
| 通讯作者 | Ji, yong-hua(yhji@staff.shu.edu.cn) |
| 英文摘要 | Bmk i is classified as a-like scorpion toxin that specifically binds the voltage-gated sodium channels via receptor site-3. previous results showed bmk i induced epileptiform responses in rats via intra-hippocampal injection, but the mechanism has yet to be clarified. in this study, using two-electrode voltage/current clamp technique, we determined the effects of bmk i on rnav1.2a expressed in xenopus oocytes. the results showed that bmk i prevented the development of slow inactivation of rnav1.2a from the open-state and enhanced the persistent sodium current (i(nap)) at suprathreshold potentials in concentration-dependence, whereas it hardly affected the fast inactivation. bmk i was also able to augment the subthreshold i(nap) at high concentrations (> 100 nm) with disruption of the open-state deactivation. the increased i(nap) accelerated the firing frequency in the oocytes that fired repetitively after electrode punctures, as well as raised the baseline potential and induced bursting of spikes in the quiescent oocytes. these results demonstrated that bmk i could target rnav1.2a and induce the i(nap) by preventing the development of slow inactivation and deactivation from the open-state, leading to the enhancement of membrane excitability, which may be involved in the bmk i-induced epilepsy. (c) 2009 published by elsevier ltd. |
| WOS关键词 | BUTHUS-MARTENSI KARSCH ; MOLECULAR DETERMINANTS ; CHANNEL INACTIVATION ; SENSORY NEURONS ; MESSENGER-RNA ; NA+ CHANNELS ; DOMAIN IV ; MODULATION ; SUBUNIT ; NEUROTOXIN |
| WOS研究方向 | Toxicology |
| WOS类目 | Toxicology |
| 语种 | 英语 |
| WOS记录号 | WOS:000267011400002 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2400142 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Ji, Yong-Hua |
| 作者单位 | 1.Shanghai Univ, Lab Neuropharmacol & Neurotoxicol, Shanghai 200444, Peoples R China 2.Chinese Acad Sci, Grad Sch, Shanghai Inst Physiol, Shanghai Inst Biol Sci, Shanghai 200031, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Mang-Mang,Tan, Miao,Cheng, Hui-Wen,et al. The alpha-like scorpion toxin bmk i enhances membrane excitability via persistent sodium current by preventing slow inactivation and deactivation of rnav1.2a expressed in xenopus oocytes[J]. Toxicology in vitro,2009,23(4):561-568. |
| APA | Zhu, Mang-Mang,Tan, Miao,Cheng, Hui-Wen,&Ji, Yong-Hua.(2009).The alpha-like scorpion toxin bmk i enhances membrane excitability via persistent sodium current by preventing slow inactivation and deactivation of rnav1.2a expressed in xenopus oocytes.Toxicology in vitro,23(4),561-568. |
| MLA | Zhu, Mang-Mang,et al."The alpha-like scorpion toxin bmk i enhances membrane excitability via persistent sodium current by preventing slow inactivation and deactivation of rnav1.2a expressed in xenopus oocytes".Toxicology in vitro 23.4(2009):561-568. |
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来源：中国科学院大学
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