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• W3013852583 abstract "Abstract Automated patch clamp (APC) instruments enable efficient evaluation of electrophysiologic effects of drugs on human cardiac currents in heterologous expression systems. Differences in experimental protocols, instruments, and dissimilar site procedures affect the variability of IC 50 values characterizing drug block potency. This impacts the utility of APC platforms for assessing a drug’s cardiac safety margin. We determined variability of APC data from multiple sites that measured blocking potency of 12 blinded drugs (with different levels of proarrhythmic risk) against four human cardiac currents (hERG [I Kr ], hCav1.2 [L-Type I Ca ], peak hNav1.5, [Peak I Na ], late hNav1.5 [Late I Na ]) with recommended protocols (to minimize variance) using five APC platforms across 17 sites. IC 50 variability (25/75 percentiles) differed for drugs and currents (e.g., 10.4-fold for dofetilide block of hERG current and 4-fold for mexiletine block of hNav1.5 current). Within-platform variance predominated for 4 of 12 hERG blocking drugs and 4 of 6 hNav1.5 blocking drugs. hERG and hNav1.5 block. Bland-Altman plots depicted varying agreement across APC platforms. A follow-up survey suggested multiple sources of experimental variability that could be further minimized by stricter adherence to standard protocols. Adoption of best practices would ensure less variable APC datasets and improved safety margins and proarrhythmic risk assessments." @default.
• W3013852583 created "2020-04-03" @default.
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• W3013852583 date "2020-03-27" @default.
• W3013852583 modified "2023-10-02" @default.
• W3013852583 title "Cross-site and cross-platform variability of automated patch clamp assessments of drug effects on human cardiac currents in recombinant cells" @default.
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• W3013852583 doi "https://doi.org/10.1038/s41598-020-62344-w" @default.
• W3013852583 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7101356" @default.
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• W3013852583 hasPublicationYear "2020" @default.
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