Functional Studies of Synthetic Gramicidin Hybrid Ion Channels in CHO Cells

Functional Studies of Synthetic Gramicidin Hybrid Ion Channels in CHO Cells
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CHO 细胞中合成短杆菌肽混合离子通道的功能研究

DOI:
10.1002/cbic.200600384
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发表时间:
2007
期刊:
影响因子:
3.2
通讯作者:
O. Strauss
O. Strauss
中科院分区:
生物学3区
文献类型:
--
作者:
R. Wesolowski;A. Sommer;H.-D. Arndt;U. Koert;P. Reiß;S. Wimmers;O. Strauss

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用膜片钳技术研究了中国仓鼠卵巢(CHO)细胞短杆菌肽复合离子通道的功能。人工合成的离子通道1由两个环己基醚氨基酸组成,连接两条minigramicidin链。当1浓度为1.0 μM时,1.37 min后观察到全细胞膜电导增加。当Cs+用作电荷载体时,电导显示出比使用Na+和K+时更大的电流。在使用Cs+作为电荷载体的单通道记录中,该物质在活细胞膜和人工黑色脂质双层中显示出相当的单通道振幅。化合物1除了作为阳离子通道外,还表现出水通道的特性。CHO细胞暴露于细胞外低渗溶液基本上不改变细胞体积。在细胞外低渗条件下,1使细胞大小增加到对照的146.5%。因此,合成的杂合通道1可以作为具有一定Cs+特异性的阳离子通道,并且可以作为CHO细胞中的水通道。
The function of a gramicidin hybrid ion channel in living Chinese hamster ovary (CHO) cells was investigated by the patch clamp method. The synthetic ion channel1consists of two cyclohexyl ether amino acids that link two minigramicidin strands. With1at a concentration of 1.0 μM, an increase in the whole‐cell membrane conductance was observed after 1.37 min. The conductance showed larger currents when Cs+was used as charge carrier than when Na+and K+were used. In single‐channel recordings with Cs+as charge carrier, the substance showed comparable single‐channel amplitudes in the membrane of living cells and artificial black lipid bilayers. In addition to functioning as a cation channel, compound1appeared to be a water channel. Exposure of the CHO cells to an extracellular hypoosmotic solution did not substantially change the cell volume. Extracellular hypoosmotic conditions in the presence of1increased the cell size to 146.5 % that of the control. Thus, the synthetic hybrid channel1can function as a cation channel with some Cs+specificity, and as a water channel in CHO cells.
培养的小梁网细胞对合成离子通道的电生理反应。
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