Selective Inhibition of Cardiac Late Na+ Current Is Based on Fast Offset Kinetics of the Inhibitor
The present study was designed to test the hypothesis that the selectivity of blocking the late Na+ current (INaL) over the peak Na+ current (INaP) is related to the fast offset kinetics of the Na+ channel inhibitor. Therefore, the effects of 1 µM GS967 (INaL inhibitor), 20 µM mexiletine (I/B antiar...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2023
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| Sorozat: | BIOMEDICINES
11 No. 9 |
| Tárgyszavak: | |
| doi: | 10.3390/biomedicines11092383 |
| mtmt: | 34113182 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/28120 |
| LEADER | 02623nab a2200397 i 4500 | ||
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| 024 | 7 | |a 34113182 |2 mtmt | |
| 040 | |a SZTE Publicatio Repozitórium |b hun | ||
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| 100 | 1 | |a Naveed Muhammad | |
| 245 | 1 | 0 | |a Selective Inhibition of Cardiac Late Na+ Current Is Based on Fast Offset Kinetics of the Inhibitor |h [elektronikus dokumentum] / |c Naveed Muhammad |
| 260 | |c 2023 | ||
| 300 | |a 13 | ||
| 490 | 0 | |a BIOMEDICINES |v 11 No. 9 | |
| 520 | 3 | |a The present study was designed to test the hypothesis that the selectivity of blocking the late Na+ current (INaL) over the peak Na+ current (INaP) is related to the fast offset kinetics of the Na+ channel inhibitor. Therefore, the effects of 1 µM GS967 (INaL inhibitor), 20 µM mexiletine (I/B antiarrhythmic) and 10 µM quinidine (I/A antiarrhythmic) on INaL and INaP were compared in canine ventricular myocardium. INaP was estimated as the maximum velocity of action potential upstroke (V+max). Equal amounts of INaL were dissected by the applied drug concentrations under APVC conditions. The inhibition of INaL by mexiletine and quinidine was comparable under a conventional voltage clamp, while both were smaller than the inhibitory effect of GS967. Under steady-state conditions, the V+max block at the physiological cycle length of 700 ms was 2.3% for GS967, 11.4% for mexiletine and 26.2% for quinidine. The respective offset time constants were 110 ± 6 ms, 456 ± 284 ms and 7.2 ± 0.9 s. These results reveal an inverse relationship between the offset time constant and the selectivity of INaL over INaP inhibition without any influence of the onset rate constant. It is concluded that the selective inhibition of INaL over INaP is related to the fast offset kinetics of the Na+ channel inhibitor. | |
| 650 | 4 | |a Farmakológia és gyógyszerészet | |
| 700 | 0 | 1 | |a Mohammed Aiman |e aut |
| 700 | 0 | 1 | |a Topal Leila |e aut |
| 700 | 0 | 1 | |a Kovács Zsigmond Máté |e aut |
| 700 | 0 | 1 | |a Dienes Csaba |e aut |
| 700 | 0 | 1 | |a Ovári József |e aut |
| 700 | 0 | 1 | |a Szentandrássy Norbert |e aut |
| 700 | 0 | 1 | |a Magyar János |e aut |
| 700 | 0 | 1 | |a Bányász Tamás |e aut |
| 700 | 0 | 1 | |a Prorok János |e aut |
| 700 | 0 | 1 | |a Jost Norbert László |e aut |
| 700 | 0 | 1 | |a Virág László |e aut |
| 700 | 0 | 1 | |a Baczkó István |e aut |
| 700 | 0 | 1 | |a Varró András |e aut |
| 700 | 0 | 1 | |a Nánási Péter P. |e aut |
| 700 | 0 | 1 | |a Horváth Balázs |e aut |
| 856 | 4 | 0 | |u http://publicatio.bibl.u-szeged.hu/28120/1/naveed.pdf |z Dokumentum-elérés |