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dc.contributor.authorDel Canto, Irene
dc.contributor.authorSuch-Miquel, Luis
dc.contributor.authorBrines, Laia
dc.contributor.authorSoler, Carlos
dc.contributor.authorZarzoso, Manuel
dc.contributor.authorCalvo, Conrado
dc.contributor.authorParra, Germán
dc.contributor.authorTormos, Álvaro
dc.contributor.authorAlberola, Antonio
dc.contributor.authorMillet, José
dc.contributor.authorSuch, Luis
dc.contributor.authorChorro, Francisco J.
dc.identifier.citationCANTO, Irene, et al. Effects of JTV‐519 on stretch‐induced manifestations of mechanoelectric feedback. Clinical and Experimental Pharmacology and Physiology, 2016, vol. 43, no 11, p. 1062-1070.ca_CA
dc.description.abstractJTV-519 is a 1,4-benzothiazepine derivative with multichannel effects that inhibits Ca2+ release from the sarcoplasmic reticulum and stabilizes the closed state of the ryanodine receptor, preventing myocardial damage and the induction of arrhythmias during Ca2+ overload. Mechanical stretch increases cellular Na+ inflow, activates the reverse mode of the Na+/Ca2+ exchanger, and modifies Ca2+ handling and myocardial electrophysiology, favoring arrhythmogenesis. This study aims to determine whether JTV-519 modifies the stretch-induced manifestations of mechanoelectric feedback. The ventricular fibrillation (VF) modifications induced by acute stretch were studied in Langendorff-perfused rabbit hearts using epicardial multiple electrodes under control conditions (n=9) or during JTV-519 perfusion: 0.1 μmol/L (n=9) and 1 μmol/L (n=9). Spectral and mapping techniques were used to establish the baseline, stretch and post-stretch VF characteristics. JTV-519 slowed baseline VF and decreased activation complexity. These effects were dose-dependent (baseline VF dominant frequency: control=13.9±2.2 Hz; JTV 0.1 μmol/L=11.1±1.1 Hz, P<.01; JTV 1 μmol/L=6.6±1.1 Hz, P<.0001). The stretch-induced acceleration of VF (control=38.8%) was significantly reduced by JTV-519 0.1 μmol/L (19.8%) and abolished by JTV 1 μmol/L (−1.5%). During stretch, the VF activation complexity index was reduced in both JTV-519 series (control=1.60±0.15; JTV 0.1 μmol/L=1.13±0.3, P<.0001; JTV 1 μmol/L=0.57±0.21, P<.0001), and was independently related to VF dominant frequency (R=.82; P<.0001). The fifth percentile of the VF activation intervals, conduction velocity and wavelength entered the multiple linear regression model using dominant frequency as the dependent variable (R=−.84; P<.0001). In conclusion, JTV-519 slowed and simplified the baseline VF activation patterns and abolished the stretch-induced manifestations of mechanoelectric feedback.ca_CA
dc.description.sponsorShipThis work was supported by the Spanish Ministry of Economy and Competitiveness (Carlos III Health Institute)/European FEDER Grants FIS PI12/00407, PI15/01408, PIE15/00013 and RETIC “RIC” RD12/0042/0048, and by Generalitat Valenciana Grant PROMETEO FASEII 2014/037.ca_CA
dc.format.extent9 p.ca_CA
dc.relation.isPartOfClinical and Experimental Pharmacology and Physiology, 2016, vol. 43, no 11ca_CA
dc.rightsCopyright © John Wiley & Sons, Inc. All Rights Reservedca_CA
dc.subjectmechanoelectric feedbackca_CA
dc.subjectmyocardial stretchca_CA
dc.subjectventricular fibrillationca_CA
dc.titleEffects of JTV-519 on stretch-induced manifestations of mechanoelectric feedbackca_CA

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