Overlap syndrome of cardiac sodium channel disease in mice carrying... (2006)

Titel Overlap syndrome of cardiac sodium channel disease in mice carrying the equivalent mutation of human SCN5A-1795insD
Gepubliceerd in CIRCULATION, Vol. 114, No. 24, p.2584-2594. ISSN 00097322.
Auteur C.A. Remme; A.O. Verkerk; D. Nuyens; A.C.G. van Ginneken; S. van Brunschot; C.N.W. Belterman; R. Wilders; M.A. van Roon; H.L. Tan; A.A.M. Wilde; P. Carmeliet; J.M.T. de Bakker; M.W. Veldkamp; C.R. Bezzina
Datum 2006
Type Artikel
Samenvatting Background - Patients carrying the cardiac sodium channel (SCN5A) mutation 1795insD show sudden nocturnal death and signs of multiple arrhythmia syndromes including bradycardia, conduction delay, QT prolongation, and right precordial ST-elevation. We investigated the electrophysiological characteristics of a transgenic model of the murine equivalent mutation 1798insD. Methods and Results - On 24-hour continuous telemetry and surface ECG recordings, Scn5a(1798insD/+) heterozygous mice showed significantly lower heart rates, more bradycardic episodes ( pauses >= 500 ms), and increased PQ interval, QRS duration, and QTc interval compared with wild-type mice. The sodium channel blocker flecainide induced marked sinus bradycardia and/or sinus arrest in the majority of Scn5a(1798insD/+) mice, but not in wild-type mice. Epicardial mapping using a multielectrode grid on excised, Langendorff-perfused hearts showed preferential conduction slowing in the right ventricle of Scn5a(1798insD/+) hearts. On whole-cell patch-clamp analysis, ventricular myocytes isolated from Scn5a(1798insD/+) hearts displayed action potential prolongation, a 39% reduction in peak sodium current density and a similar reduction in action potential upstroke velocity. Scn5a(1798insD/+) myocytes displayed a slower time course of sodium current decay without significant differences in voltage-dependence of activation and steady-state inactivation, slow inactivation, or recovery from inactivation. Furthermore, Scn5a(1798insD/+) myocytes showed a larger tetrodotoxin-sensitive persistent inward current compared with wild-type myocytes. Conclusions - Mice carrying the murine equivalent of the SCN5A-1795insD mutation display bradycardia, right ventricular conduction slowing, and QT prolongation, similar to the human phenotype. These results demonstrate that the presence of a single SCN5A mutation is indeed sufficient to cause an overlap syndrome of cardiac sodium channel disease
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Persistent Identifier urn:nbn:nl:ui:29-232696
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Repository Universiteit van Amsterdam

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