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OPENCitation: Cell Death and Illness (2013) 4, e843; doi:10.1038/cddis.2013.369 2013 Macmillan Publishers Restricted All rights reserved 2041-4889/nature/cddisCaMKII inhibition rectifies arrhythmic phenotype inside a patient-specific model of catecholaminergic polymorphic ventricular tachycardiaE Di Pasquale1,9,ten, F Lodola2,9, M Miragoli3,4, M Denegri2, JE Avelino-Cruz2,11, M Buonocore5, H Nakahama3, P Portararo6, R Bloise2, C Napolitano2,7, G Condorelli,four and SG Priori,2,7,Induced pluripotent stem cells (iPSC) present a special chance for developmental research, disease modeling and regenerative medicine approaches in humans. The aim of our study was to make an in vitro `patient-specific cell-based system’ that could facilitate the screening of new therapeutic molecules for the therapy of catecholaminergic polymorphic ventricular tachycardia (CPVT), an inherited type of fatal arrhythmia. Here, we report the development of a cardiac model of CPVT via the generation of iPSC from a CPVT patient carrying a heterozygous mutation in the cardiac ryanodine receptor gene (RyR2) and their subsequent differentiation into cardiomyocytes (CMs). Whole-cell patch-clamp and intracellular electrical recordings of spontaneously beating cells revealed the presence of delayed afterdepolarizations (DADs) in CPVT-CMs, both in resting conditions and immediately after b-adrenergic stimulation, resembling the cardiac phenotype from the sufferers. Moreover, therapy with KN-93 (2-[N-(2-hydroxyethyl)]-N-(4methoxybenzenesulfonyl)]amino-N-(4-chlorocinnamyl)-N-methylbenzylamine), an antiarrhythmic drug that inhibits Ca2 ?/calmodulin-dependent serine hreonine PRMT3 Inhibitor Storage & Stability protein kinase II (CaMKII), drastically decreased the presence of DADs in CVPT-CMs, rescuing the arrhythmic phenotype induced by catecholamine.
