首都医科大学学报 ›› 2005, Vol. 26 ›› Issue (6): 719-721.

• 基础研究 • 上一篇    下一篇

HEK293细胞内源性电压门控钾离子通道电生理学特性研究

李晶玮1, 胡大一2, 李翠兰3, 杨进刚2   

  1. 1. 首都医科大学附属北京天坛医院心血管内科;2. 首都医科大学附属北京同仁医院心血管中心;3. 北京大学人民医院心血管内科
  • 收稿日期:2004-08-26 修回日期:1900-01-01 出版日期:2005-12-24 发布日期:2005-12-24

Study on Electrophysiological Properties of Endogenous Voltage-Gated Potassium Channels in Human Embryonic Kidney(HEK293) Cells

Li Jingwei1, Hu Dayi2, Li Cuilan3, Yang Jingang2   

  1. 1. Department of Cardiology, Beijing Tiantan Hospital, Capital University of Medical Sciences;2. Department of Center of Cardiovascular Disease, Beijing Tongren Hospital, Capital Universityof Medical Sciences;3. Department of Cardiology, People's Hospital, Peking University
  • Received:2004-08-26 Revised:1900-01-01 Online:2005-12-24 Published:2005-12-24

摘要: 目的 探讨人胚胎肾细胞(HEK293细胞)内源性电压门控钾通道的电生理特性,避免HEK293细胞上内源性离子通道对外源性离子通道表达时的干扰。方法 利用全细胞膜片钳技术分析了HEK293细胞内源性电压门控钾通道的电生理特性。结果 在HEK293细胞上去极化电压从-80mV开始可触发1个外向电流。在+100mV时电流为(422.78±68.87)pA,电流密度为(21.91±3.20)pA/pF。钾通道阻断剂四乙胺(tetraethylammonium,TEA)、4-氨基吡啶(4-aminopyri-dine,4-AP),在将细胞外液钾浓度由4mmol/L提高到40mmol/L时,对外向电流有影响。结论 正常培养的HEK293细胞本身有内源性的钾通道。该外向电流可能包括了IK、IK1、IKur和Ito

关键词: HEK293细胞, 膜片钳, 全细胞记录, 延迟整流, 电压门控钾电流

Abstract: Objective To study electrophysiological properties of endogenous voltage-gated outward currents of potassium channels in HEK293 cells.Methods Whole-cell voltage patch clamp experiment was performed on this expression system.Results In HEK293 cells, depolarizing voltage steps from-80 mVtriggered an outward current.This current had an amplitude (422.78±68.87) pAat +100 mVand a current density of (21.91±3.20) pA/pF.TEA, 4-APas potassium channel blockers and a rise in extracellular K+ concentration from 4 to 40 mmol/Lcould block the outward currents.Conclusion Functional endogenous K+ channels exist in HEK293 cells under normal culture conditions.Their outward current may consist of IK, IK1, IKur and Ito.

Key words: HEK293 cells, patch-clamp, whole-cells recording, delayed rectifier, voltage-gated K~+ currents

中图分类号: