Effect of mibefradil on sodium and calcium currents.
Effect of mibefradil on sodium and calcium currents.
复制标题
米贝拉地尔对钠电流和钙电流的影响。
DOI:
10.1152/ajpgi.00022.2005
复制
发表时间:
2005
期刊:
影响因子:
--
通讯作者:
Farrugia,Gianrico
中科院分区:
文献类型:
--
作者:
Strege,PeterR;Bernard,CherylE;Ou,Yijun;Gibbons,SimonJ;Farrugia,Gianrico
Interstitial cells of Cajal (ICC) generate the electrical slow wave. The ionic conductances that contribute to the slow wave appear to vary among species. In humans, a tetrodotoxin-resistant Na+current (NaV1.5) encoded bySCN5Acontributes to the rising phase of the slow wave, whereas T-type Ca2+currents have been reported from cultured mouse intestine ICC and also from canine colonic ICC. Mibefradil has a higher affinity for T-type over L-type Ca2+channels, and the drug has been used in the gastrointestinal tract to identify T-type currents. However, the selectivity of mibefradil for T-type Ca2+channels over ICC and smooth muscle Na+channels has not been clearly demonstrated. The aim of this study was to determine the effect of mibefradil on T-type and L-type Ca2+and Na+currents. Whole cell currents were recorded from HEK-293 cells coexpressing green fluorescent protein with either the rat brain T-type Ca2+channel α13.3b + β2, the human intestinal L-type Ca2+channel subunits α1C+ β2, or NaV1.5. Mibefradil significantly reduced expressed T-type Ca2+current at concentrations ≥ 0.1 μM (IC50= 0.29 μM), L-type Ca2+current at > 1 μM (IC50= 2.7 μM), and Na+current at ≥ 0.3 μM (IC50= 0.98 μM). In conclusion, mibefradil inhibits the human intestinal tetrodotoxin-resistant Na+channel at submicromolar concentrations. Caution must be used in the interpretation of the effects of mibefradil when several ion channel classes are coexpressed.
登录
查看更多内容
DOI:
10.1152/ajpgi.00152.2003
发表时间:
2003-12-01
影响因子:
4.5
作者:
Strege, PR;Ou, YJ;Farrugia, G
通讯作者:
Farrugia, G
影响因子:
3.8
作者:
Strichartz, G R
通讯作者:
Strichartz, G R
DOI:
--
发表时间:
2000-10
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
Ruth L. Martin;Jung-Ha Lee;L. Cribbs;E. Perez-Reyes;D. A. Hanck
通讯作者:
Ruth L. Martin;Jung-Ha Lee;L. Cribbs;E. Perez-Reyes;D. A. Hanck
DOI:
10.1016/b978-0-12-512504-8.50009-3
发表时间:
1971
期刊:
Neurosciences research
影响因子:
--
作者:
T. Narahashi;D. Frazier
通讯作者:
D. Frazier
DOI:
10.1152/ajpcell.00266.2002
发表时间:
2002
期刊:
American journal of physiology. Cell physiology
影响因子:
--
作者:
Walker,RebeccaL;Koh,SangDon;Sergeant,GerardP;Sanders,KentonM;Horowitz,Burton
通讯作者:
Horowitz,Burton