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Automated Voltage-Clamp Technique

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The voltage-clamp electrophysiology method is the gold standard for measuring the function of ion channels. In the past, this technique has had limited applicability in pharmaceutical drug discovery because of its low throughput, steep learning curve, and challenges in standardization of the experiments. Recently, new electrophysiology platforms have been developed, which are based on the use of planar electrodes. One key advantage of the new electrode geometry is that it makes the process of cell-to-electrode sealing amenable to automation, thus increasing the throughput and significantly reducing the skill-set needed to run the experiments. The further addition of computer-controlled fluidics, voltage-clamping electronics, and automated data handling makes it possible to perform multiple electrophysiology experiments in parallel with a high degree of consistency and in completely automated mode. Among the new offerings for automated voltage clamp, one of the systems, PatchXpress/Sealchip, is quickly becoming the new gold standard for the quantification of ion channel function. In this chapter, we provide an overview of the new planar patch-clamping platforms and describe how electrophysiology experiments are performed on the PatchXpress/Sealchip automated system.
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