Effect of mibefradil on sodium and calcium currents.

Effect of mibefradil on sodium and calcium currents.
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米贝拉地尔对钠电流和钙电流的影响。

DOI:
10.1152/ajpgi.00022.2005
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发表时间:
2005
期刊:
American journal of physiology. Gastrointestinal and liver physiology
影响因子:
--
通讯作者:
Farrugia,Gianrico
Farrugia,Gianrico
中科院分区:
--
文献类型:
--
作者:
Strege,PeterR;Bernard,CherylE;Ou,Yijun;Gibbons,SimonJ;Farrugia,Gianrico

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Cajal间质细胞(ICC)产生电慢波。有助于慢波的离子电导似乎因物种而异。在人类中,由SCN 5A编码的河豚毒素抗性Na+电流(NaV1.5)有助于慢波的上升相,而T型Ca 2+电流已被报道来自培养的小鼠肠ICC和犬结肠ICC。米贝拉地尔对T型钙通道的亲和力高于L型钙通道,该药物已用于胃肠道识别T型电流。然而,米贝拉地尔对T型Ca 2+通道的选择性超过ICC和平滑肌Na+通道尚未得到明确证明。本研究的目的是确定米贝拉地尔对T型和L型Ca 2+和Na+电流的影响。从共表达绿色荧光蛋白的HEK-293细胞记录全细胞电流,所述细胞与大鼠脑T型Ca 2+通道α 13.3 b + β2、人肠L型Ca 2+通道亚基α1C+ β2或NaV 1.5共表达。米贝拉地尔在浓度≥ 0.1 μM时显著降低表达的T型Ca 2+电流(IC 50 = 0.29 μM),在浓度> 1 μM时显著降低表达的L型Ca 2+电流(IC 50 = 2.7 μM),在浓度≥ 0.3 μM时显著降低表达的Na+电流(IC 50 = 0.98 μM)。总之,米贝拉地尔在亚微摩尔浓度下抑制人肠河豚毒素抗性Na+通道。当几种离子通道类共表达时,在解释米贝拉地尔的作用时必须谨慎。
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.
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