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Title: Load-reducing therapy prevents development of arrhythmogenic right ventricular cardiomyopathy in plakoglobin-deficient mice
Authors: Fabritz, Larissa
Hoogendijk, Mark G.
Scicluna, Brendon P.
Amersfoorth, Shirley C.M. van
Fortmueller, Lisa
Wolf, Susanne
Laakmann, Sandra
Kreienkamp, Nina
Piccini, Ilaria
Breithardt, Günter
Ruiz Noppinger, Patricia
Witt, Henning
Ebnet, Klaus
Wichter, Thomas
Levkau, Bodo
Franke, Werner W.
Pieperhoff, Sebastian
Bakker, Jacques M. T. de
Coronel, Ruben
Kirchhof, Paulus
Keywords: Heart -- Diseases -- Patients
Heart -- Hypertrophy
Connexin 43
Issue Date: 2011
Publisher: Elsevier Inc.
Citation: Fabritz, L., Hoogendijk, M. G., Scicluna, B. P., Van Amersfoorth, S. C., Fortmueller, L., Wolf, S., ... & Kirchhof, P. (2011). Load-reducing therapy prevents development of arrhythmogenic right ventricular cardiomyopathy in plakoglobin-deficient mice. Journal of the American College of Cardiology, 57(6), 740-750.
Abstract: Objectives: We used a murine model of arrhythmogenic right ventricular cardiomyopathy (ARVC) to test whether reducing ventricular load prevents or slows development of this cardiomyopathy.
Background: At present, no therapy exists to slow progression of ARVC. Genetically conferred dysfunction of the mechanical cell-cell connections, often associated with reduced expression of plakoglobin, is thought to cause ARVC.
Methods: Littermate pairs of heterozygous plakoglobin-deficient mice (plako(+/-)) and wild-type (WT) littermates underwent 7 weeks of endurance training (daily swimming). Mice were randomized to blinded load-reducing therapy (furosemide and nitrates) or placebo.
Results: Therapy prevented training-induced right ventricular (RV) enlargement in plako(+/-) mice (RV volume: untreated plako(+/-) 136 ± 5 μl; treated plako(+/-) 78 ± 5 μl; WT 81 ± 5 μl; p < 0.01 for untreated vs. WT and untreated vs. treated; mean ± SEM). In isolated, Langendorff-perfused hearts, ventricular tachycardias (VTs) were more often induced in untreated plako(+/-) hearts (15 of 25), than in treated plako(+/-) hearts (5 of 19) or in WT hearts (6 of 21, both p < 0.05). Epicardial mapping of the RV identified macro-re-entry as the mechanism of ventricular tachycardia. The RV longitudinal conduction velocity was reduced in untreated but not in treated plako(+/-) mice (p < 0.01 for untreated vs. WT and untreated vs. treated). Myocardial concentration of phosphorylated connexin43 was lower in plako(+/-) hearts with VTs compared with hearts without VTs and was reduced in untreated plako(+/-) compared with WT (both p < 0.05). Plako(+/-) hearts showed reduced myocardial plakoglobin concentration, whereas β-catenin and N-cadherin concentration was not changed.
Conclusions: Load-reducing therapy prevents training-induced development of ARVC in plako(+/-) mice.
Appears in Collections:Scholarly Works - FacHScABS

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