Inhibition of Kir4.1 potassium channels by quinacrine.

Inhibition of Kir4.1 potassium channels by quinacrine.
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DOI:
10.1016/j.brainres.2017.03.009
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发表时间:
2017-05-15
期刊:
影响因子:
2.9
通讯作者:
Rodríguez-Menchaca AA
Rodríguez-Menchaca AA
中科院分区:
医学3区
文献类型:
--
作者:
Marmolejo-Murillo LG;Aréchiga-Figueroa IA;Cui M;Moreno-Galindo EG;Navarro-Polanco RA;Sánchez-Chapula JA;Ferrer T;Rodríguez-Menchaca AA

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内向整流钾(KIR)通道在多种细胞类型中表达,参与多种生理过程。特别是Kir4.1通道参与了星形胶质细胞的空间钾缓冲。在这项工作中,我们利用膜片钳技术,检测了阳离子两亲性药物奎纳克林对HEK293细胞中异源表达的Kir4.1通道的影响。奎纳克林以浓度和电压依赖的方式抑制Kir4.1通道电流。在由内向外的斑片上,喹卡林对Kir4.1通道的IC50值为1.8±0.3μM,且具有极慢的阻断和解除阻断动力学。分子模拟结合突变研究表明,奎纳克林通过堵塞通道的中央空腔来阻断Kir4.1,并由残基E158和T128稳定。总体而言,这项研究表明,奎纳克林阻断了Kir4.1通道,预计这将影响钾在几个组织中的运输。
Inwardly rectifying potassium (Kir) channels are expressed in many cell types and contribute to a wide range of physiological processes. Particularly, Kir4.1 channels are involved in the astroglial spatial potassium buffering. In this work, we examined the effects of the cationic amphiphilic drug quinacrine on Kir4.1 channels heterologously expressed in HEK293 cells, employing the patch clamp technique. Quinacrine inhibited the currents of Kir4.1 channels in a concentration and voltage dependent manner. In inside-out patches, quinacrine inhibited Kir4.1 channels with an IC50 value of 1.8 ± 0.3 μM and with extremely slow blocking and unblocking kinetics. Molecular modeling combined with mutagenesis studies suggested that quinacrine blocks Kir4.1 by plugging the central cavity of the channels, stabilized by the residues E158 and T128. Overall, this study shows that quinacrine blocks Kir4.1 channels, which would be expected to impact the potassium transport in several tissues.
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