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Updated: Jul 15, 2025
High-throughput Screening for Small-molecule Modulators of Inward Rectifier Potassium Channels
Published on: January 27, 2013
High throughput clone screening on overexpressed hERG1 and Kv1.3 potassium channels using ion channel reader (ICR)
Alberto Montalbano1, Cesare Sala1, Ginevra Chioccioli Altadonna2
1Department of Experimental and Clinical Medicine, University of Florence, I-50134, Florence, Italy.
Abstract:
Pharmacological studies aimed at the development of newly synthesized drugs directed against ion channels (as well as genetic studies of ion channel mutations) involve the development and use of transfected cells. However, the identification of the best clone, in terms of transfection efficiency, is often a time consuming procedure when performed through traditional methods such as manual patch-clamp. On the other hand, the use of other faster techniques, such as for example the IF, are not informative on the effective biological functionality of the transfected ion channel(s). In the present work, we used the high throughput automated ion channel reader (ICR) technology (ICR8000 Aurora Biomed Inc.) that combine atomic absorption spectroscopy with a patented microsampling process to accurately measure ion flux in cell-based screening assays. This technology indeed helped us to evaluate the transfection efficiency of hERG1 and hKv1.3 channels respectively on the HEK-293 and CHO cellular models. Moreover, as proof of the validity of this innovative method, we have corroborated these data with the functional characterization of the potassium currents carried out by the same clones through patch-clamp recordings. The results obtained in our study are promising and represent a valid methodological strategy to screen a large number of clones simultaneously and to pharmacologically evaluate their functionality within an extremely faster timeframe.
Insights
This study introduces a high-throughput automated ion channel reader (ICR) technology for efficiently screening transfected cell clones. The ICR technology accelerates the identification and functional evaluation of ion channels, crucial for drug development.
Area of Science:
- Pharmacology
- Molecular Biology
- Biotechnology
Background:
- Drug discovery targeting ion channels relies on transfected cells.
- Traditional methods for clone selection (e.g., manual patch-clamp) are time-consuming.
- Faster methods like immunofluorescence (IF) lack functional information.
Purpose of the Study:
- To evaluate a high-throughput automated ion channel reader (ICR) technology for assessing transfection efficiency.
- To validate the ICR technology's ability to measure ion flux and functional ion channel activity.
- To demonstrate a faster, more efficient method for screening ion channel clones.
Main Methods:
- Utilized the ICR8000 Aurora Biomed Inc. automated ion channel reader.
- Employed atomic absorption spectroscopy and a patented microsampling process for ion flux measurement.
- Evaluated transfection efficiency of hERG1 and hKv1.3 channels in HEK-293 and CHO cells.
- Corroborated ICR results with patch-clamp recordings for functional characterization.
Main Results:
- The ICR technology accurately measured ion flux in cell-based screening assays.
- Successfully evaluated transfection efficiency for hERG1 and hKv1.3 channels.
- Demonstrated concordance between ICR data and functional patch-clamp recordings.
- Confirmed the technology's capability for high-throughput clone screening.
Conclusions:
- The automated ICR technology offers a rapid and reliable method for evaluating ion channel transfection efficiency.
- This approach significantly accelerates the screening and functional assessment of clones for drug development.
- The ICR technology represents a valuable tool for advancing ion channel research and drug discovery.
