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Application of Cell Impedance as a Screening Tool to Discover Modulators of Intraocular Pressure

Vollmer, Tom, Zhou, Enhua, Rice, Dennis, Prasanna, Ganesh, Chen, Amy and Wilson, Chris (2020) Application of Cell Impedance as a Screening Tool to Discover Modulators of Intraocular Pressure. Journal of ocular pharmacology and therapeutics : the official journal of the Association for Ocular Pharmacology and Therapeutics, 36 (5). pp. 269-281. ISSN 15577732


Purpose: To identify new targets and compounds involved in mediating cellular contractility or relaxation in trabecular meshwork (TM) cells and test their efficacy in an ex vivo model measuring outflow facility. Methods: A low-molecular weight compound library composed of 3,957 compounds was screened for cytoskeletal changes using the Acea xCelligence impedance platform in immortalized human NTM5 TM cells. Hits were confirmed by 8-point concentration response and were subsequently evaluated for impedance changes in 2 primary human TM strains, as well as cross-reactivity in bovine primary cells. A recently described bovine whole eye perfusion system was used to evaluate effects of compounds on aqueous outflow facility. Results: The primary screen conducted was robust, with Z' values >0.5. Fifty-two compounds were identified in the primary screen and confirmed to have concentration-dependent effects on impedance in NTM5 cells. Of these, 9 compounds representing distinct drug classes were confirmed to modulate impedance in both human primary TM cells and bovine cells. One of these compounds, wortmannin, an inhibitor of phosphoinositide 3-kinase, increased outflow facility by 11%. Conclusions: A robust phenotypic assay was developed that enabled identification of contractility modulators in immortalized TM cells. The screening hits were translatable to primary TM cells and modulated outflow facility in an ex vivo perfusion assay.

Item Type: Article
Keywords: contractility high-throughput screening impedance IOP outflow PI3K
Date Deposited: 23 Jun 2020 00:45
Last Modified: 23 Jun 2020 00:45


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