2024-03-29T06:37:32Zhttps://repositori.uji.es/oai/requestoai:repositori.uji.es:10234/1682212020-04-29T08:21:27Zcom_10234_8017com_10234_9col_10234_8616
00925njm 22002777a 4500
dc
Del Canto, Irene
author
Such-Miquel, Luis
author
Brines, Laia
author
Soler, Carlos
author
Zarzoso, Manuel
author
Calvo, Conrado
author
Parra, Germán
author
Tormos, Álvaro
author
Alberola, Antonio
author
Millet, José
author
Such-Miquel, Luis
author
Chorro, Francisco J.
author
2016
JTV-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.
CANTO, 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.
0305-1870
1440-1681
http://hdl.handle.net/10234/168221
http://dx.doi.org/10.1111/1440-1681.12630
JTV-519
K201
mapping
mechanoelectric feedback
myocardial stretch
ventricular fibrillation
Effects of JTV-519 on stretch-induced manifestations of mechanoelectric feedback