Lipid Bilayer Reformation Using the Wiping Blade for Improved Ion Channel Analysis

• Published in: Analytical chemistry (Washington) Vol. 95; no. 47; pp. 17354 - 17361
• Main Authors: Mimura, Hisatoshi, Osaki, Toshihisa, Takamori, Sho, Nakao, Kenji, Takeuchi, Shoji
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 28.11.2023
• Subjects: Channel gating; Drug development; Functional analysis; Ion Channels; Lipid Bilayers; Lipid monolayers; Lipids; Membrane proteins; Modules; Nanotechnology; Surface properties; Water
• ISSN: 0003-2700; 1520-6882
• DOI: 10.1021/acs.analchem.3c03707

The measurement of ion permeation activity across planar lipid bilayers is a useful technique for the functional analysis and drug evaluation of ion channels at the single-molecule level. To enhance the data throughput, parallelization of lipid bilayers is desirable. However, existing parallelized approaches face challenges in simultaneously and efficiently measuring ion channel activities under various conditions on one chip. In this study, we propose an approach to overcome these limitations by developing a device capable of repeated measurements of ion channels incorporated into individually arrayed lipid bilayers. Our device forms an array of a lipid bilayer at a micropore on a separator by merging two lipid monolayers assembled on the surface of aqueous droplets. We introduce a vertically moving, blade-shaped module─referred to as a "wiping blade"─which enables controlled disruption and reformation of the bilayer at the micropore. By optimizing the surface properties and clearance of the wiping blade, we successfully achieved repeated bilayer formation. The arrayed lipid bilayer device with the integrated wiping blade module demonstrates a 5-fold improvement in data throughput during ion channel activity measurements. Finally, we validate the practical utility of our device by evaluating the effects of an ion channel inhibitor. The developed device opens new avenues for high-throughput analysis and screening of ion channels, leading to significant advancements in drug discovery and functional studies of membrane proteins. It offers a powerful tool for researchers in the field and holds promise for accelerating drug development by targeting ion channels.