• SyncroPatch 384/768i

    世界最速のオートパッチ
  • SyncroPatch 384/768i

    384ch同時測定 => 768chへアップグレード可能
  • SyncroPatch 384/768i

    ギガシールによるHTS
  • SyncroPatch 384/768i

    Analysis Software even more powerful than before
  • SyncroPatch 384/768i

    最先端技術によるアッセイ柔軟性

2016 - Use-dependent Block of Human Cardiac Sodium Channels by GS967

icon sp96  SyncroPatch 384PE (a predecessor model of SyncroPatch 384i) publication in Molecular Pharmacology (2016)

Authors: 
Potet F., Vanoye C.G., George Jr. A.L.

Journal: 
Mol Pharmacol (2016) 90(1):52-60


Abstract: 

GS-458967, 6-(4-(Trifluoromethoxy)phenyl)-3-(trifluoromethyl)-[1,2,4]triazolo[4,3-a]pyridine (GS967) is a recently described, novel, sodium channel inhibitor exhibiting potent antiarrhythmic effects in various in vitro and in vivo models. The antiarrhythmic mechanism has been attributed to preferential suppression of late sodium current. However, there has been no reported systematic investigation of the effects of this compound on isolated sodium channels. Here, we examined the effects of GS967 on peak (INaP) and late (INaL) sodium current recorded from cells that heterologously expressed human cardiac voltage-gated sodium channel, the principle cardiac sodium channel. As previously described, we observed that GS967 exerted tonic block of INaL (63%) to a significantly greater extent than INaP (19%). However, GS967 also caused a reduction of INaP in a frequency-dependent manner, consistent with use-dependent block (UDB). GS967 evoked more potent UDB of INaP (IC50 = 0.07 µM) than ranolazine (16 µM) and lidocaine (17 µM). Use-dependent block was best explained by a significant slowing of recovery from fast and slow inactivation with a significant enhancement of slow inactivation in the presence of GS967. Furthermore, GS967 was found to exert these same effects on a prototypical long QT syndrome mutation (delKPQ). An engineered mutation at an interaction site for local anesthetic agents (F1760A) partially attenuated the effect of GS967 on UDB, but had no effect on tonic INaL block. We conclude that GS967 is a preferential inhibitor of INaL, but it also exerts previously unreported strong effects on slow inactivation and recovery from inactivation, resulting in substantial UDB that is not entirely dependent on a known interaction site for local anesthetic agents.


Download here

Back

SyncroPatch 384i brochure

Cookies make it easier for us to provide you with our services. With the usage of our services you permit us to use cookies.
More information Ok