A Solid Supported Membrane-Based Technology for Electrophysical Screening of B0AT1-Modulating Compounds
| Autor: | Patrick Shum, Thomas Licher, John L. Kane, Carolin Gerbeth-Kreul, Gerhard Hessler, Antje Pommereau, Sven Ruf, Christian Engel, Linli Wei, Joerg Czech, Theresa A Kuntzweiler |
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| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
Chemistry Biological membrane Transporter Biochemistry Small molecule Analytical Chemistry 03 medical and health sciences 030104 developmental biology 0302 clinical medicine Membrane Direct assay Biological target Biophysics Molecular Medicine Amino acid transporter Patch clamp 030217 neurology & neurosurgery Biotechnology |
| Zdroj: | SLAS Discovery. 26:783-797 |
| ISSN: | 2472-5552 |
| DOI: | 10.1177/24725552211011180 |
| Popis: | Classical high-throughput screening (HTS) technologies for the analysis of ionic currents across biological membranes can be performed using fluorescence-based, radioactive, and mass spectrometry (MS)-based uptake assays. These assays provide rapid results for pharmacological HTS, but the underlying, indirect analytical character of these assays can be linked to high false-positive hit rates. Thus, orthogonal and secondary assays using more biological target-based technologies are indispensable for further compound validation and optimization. Direct assay technologies for transporter proteins are electrophysiology-based, but are also complex, time-consuming, and not well applicable for automated profiling purposes. In contrast to conventional patch clamp systems, solid supported membrane (SSM)-based electrophysiology is a sensitive, membrane-based method for transporter analysis, and current technical developments target the demand for automated, accelerated, and sensitive assays for transporter-directed compound screening. In this study, the suitability of the SSM-based technique for pharmacological compound identification and optimization was evaluated performing cell-free SSM-based measurements with the electrogenic amino acid transporter B0AT1 (SLC6A19). Electrophysiological characterization of leucine-induced currents demonstrated that the observed signals were specific to B0AT1. Moreover, B0AT1-dependent responses were successfully inhibited using an established in-house tool compound. Evaluation of current stability and data reproducibility verified the robustness and reliability of the applied assay. Active compounds from primary screens of large compound libraries were validated, and false-positive hits were identified. These results clearly demonstrate the suitability of the SSM-based technique as a direct electrophysiological method for rapid and automated identification of small molecules that can inhibit B0AT1 activity. |
| Databáze: | OpenAIRE |
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