کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2010758 1066988 2013 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simulation of early after-depolarisation in non-failing human ventricular myocytes: Can this help cardiac safety pharmacology?
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Simulation of early after-depolarisation in non-failing human ventricular myocytes: Can this help cardiac safety pharmacology?
چکیده انگلیسی

BackgroundIdentified as being the primary mechanism involved in the induction of torsades de pointes (TdP), early afterdepolarisation (EAD) formation is an important parameter in cardiac safety pharmacology. Easily observed experimentally at the cellular or tissue level, EAD can also be simulated by computer algorithms using animal or human models. During the last decade, confidence in these algorithms has greatly increased. We investigated the putative usefulness of EAD simulation for cardiac safety pharmacology.MethodsEAD simulations were performed in non-failing human ventricular myocytes using the O’Hara-Rudy dynamic model. The role of each cardiac current was investigated by modifying the amplitude of its activity in the model. Prediction of EAD induction by drugs was based on the ratio of their 50% inhibitory concentration values for various cardiac ionic currents to their maximal effective free therapeutic plasma concentration (EFTPCmax).ResultsIn the ventricular endocardial myocytes, EAD was only induced by at least 85% inhibition of the rapid delayed rectifier K+ current (IKr). The other currents can either induce or prevent EAD under sub- (80% IKr inhibition) or up-threshold conditions (87% IKr inhibition) of EAD. The study of the ability of drugs to induce EAD resulted in a classification which was in agreement with the Tdp risk classification.ConclusionBased on EAD computer simulation within the human situation, the present study identified the role of various cardiac currents in the EAD formation and suggested that prediction of EAD formation can be useful for early cardiac safety pharmacology.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Pharmacological Reports - Volume 65, Issue 5, September–October 2013, Pages 1281–1293
نویسندگان
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