Mexiletine-like cellular electrophysiological effects of GS967 in canine ventricular myocardium View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2021-05-05

AUTHORS

Tamás Hézső, Muhammad Naveed, Csaba Dienes, Dénes Kiss, János Prorok, Tamás Árpádffy-Lovas, Richárd Varga, Erika Fujii, Tanju Mercan, Leila Topal, Kornél Kistamás, Norbert Szentandrássy, János Almássy, Norbert Jost, János Magyar, Tamás Bányász, István Baczkó, András Varró, Péter P. Nánási, László Virág, Balázs Horváth

ABSTRACT

Enhancement of the late Na+ current (INaL) increases arrhythmia propensity in the heart, while suppression of the current is antiarrhythmic. GS967 is an agent considered as a selective blocker of INaL. In the present study, effects of GS967 on INaL and action potential (AP) morphology were studied in canine ventricular myocytes by using conventional voltage clamp, action potential voltage clamp and sharp microelectrode techniques. The effects of GS967 (1 µM) were compared to those of the class I/B antiarrhythmic compound mexiletine (40 µM). Under conventional voltage clamp conditions, INaL was significantly suppressed by GS967 and mexiletine, causing 80.4 ± 2.2% and 59.1 ± 1.8% reduction of the densities of INaL measured at 50 ms of depolarization, and 79.0 ± 3.1% and 63.3 ± 2.7% reduction of the corresponding current integrals, respectively. Both drugs shifted the voltage dependence of the steady-state inactivation curve of INaL towards negative potentials. GS967 and mexiletine dissected inward INaL profiles under AP voltage clamp conditions having densities, measured at 50% of AP duration (APD), of -0.37 ± 0.07 and -0.28 ± 0.03 A/F, and current integrals of -56.7 ± 9.1 and -46.6 ± 5.5 mC/F, respectively. Drug effects on peak Na+ current (INaP) were assessed by recording the maximum velocity of AP upstroke (V+max) in multicellular preparations. The offset time constant was threefold faster for GS967 than mexiletine (110 ms versus 289 ms), while the onset of the rate-dependent block was slower in the case of GS967. Effects on beat-to-beat variability of APD was studied in isolated myocytes. Beat-to-beat variability was significantly decreased by both GS967 and mexiletine (reduction of 42.1 ± 6.5% and 24.6 ± 12.8%, respectively) while their shortening effect on APD was comparable. It is concluded that the electrophysiological effects of GS967 are similar to those of mexiletine, but with somewhat faster offset kinetics of V+max block. However, since GS967 depressed V+max and INaL at the same concentration, the current view that GS967 represents a new class of drugs that selectively block INaL has to be questioned and it is suggested that GS967 should be classified as a class I/B antiarrhythmic agent. More... »

PAGES

9565

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-021-88903-3

DOI

http://dx.doi.org/10.1038/s41598-021-88903-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1137745407

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/33953276


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