Researchers from A*STAR Institute of Microelectronics (IME) have developed a lateral silicon-based drug screening tool that has demonstrated simultaneous capture of 12 individual cells 12 times higher throughput than conventional patch clamping. The device can be scaled up to allow 1536 cell-recordings simultaneously, permitting 16 times higher throughput than existing planar patch clamp approach. The chip enables compact design and automation, thanks to the lateral layout that allows microfluidic integration. When tested with two different anti-diabetic drugs, corresponding electrophysiological readings could be determined by the device, showing its potential for multiple drug screening. With automation, the proposed device can dramatically shorten drug development cycle for rapid screening of ion-channel drug candidates. The world-wide ion channel drug market is estimated to be worth USD 12 billion.
The ion channels in human cells play a central role in controlling a variety of physiological processes in our body which is why ion channels are important molecular targets in preclinical drug discovery. The measurement of the electrophysiological activity of the ion channels across the cells is a crucial step in screening potential drug candidates. Patch clamping is the standard technique for ion channel assay and it is traditionally a laborious and skill-intensive process that limits the throughput of electrophysiology measurement, which is a bottleneck for drug discovery process.
Dr. Tushar Bansal, IME scientist leading this effort, said, The realisation of our device using silicon as the primary material offers cost advantage over existing glass-based planar chip design, given silicons amenability for mass fabrication by standard processes. We are currently working with our industry counterparts to take this project to the next level.
IMEs silicon-based device consists of a silicon substrate with 1536 inlets. The substrate holds the cell into position, followed by the application of suction through the side channels to form a tight seal for electrical measurement.
On IMEs new silicon-based drug screening tool, Dr. Weiping Han, Head, Laboratory of Metabolic Medicine at Singapore Bioimaging Consortium, said, The successful development of the multi-channel patch clamp will likely result in a technical platform with high potential for commercialisation. It may be used by pharmaceutical and biotech companies for drug screening, and by academic researchers for mechanistic studies.
Professor Dim-Lee Kwong, Executive Director of IME said, The pre-clinical drug screening process is an arduous one, which IME hopes to address through this project. Our multidisciplinary efforts to tackle the throughput and cost issues will translate to faster access to new and more affordable drugs when they hit the market.
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