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Factor Xa inhibitors differently modulate electrical activities in pulmonary veins and the sinoatrial node.

Abstract：

:Factor Xa inhibitors reduce stroke in patients with atrial fibrillation. Pulmonary veins (PVs) and the sinoatrial node (SAN) are crucial for genesis of atrial fibrillation. However, the electrophysiological effects of factor Xa inhibitors (edoxaban and rivaroxaban) on PVs and the SAN remain unclear. Conventional microelectrodes were used to record the action potential in isolated rabbit PVs and SAN preparations before and after administration of edoxaban (0.1, 0.3, and 1 μM) or rivaroxaban (0.01, 0.03, 0.1, and 0.3 μM). A whole-cell patch-clamp was used to record the late sodium current (INa-late) in isolated single rabbit PV cardiomyocytes. Edoxaban significantly reduced PV spontaneous beating rates at 0.3 and 1 μM (N = 6 rabbits, P < 0.05), and reduced SAN beating rates at 1 μM (N = 6, P < 0.05). Similarly, rivaroxaban reduced PV spontaneous beating rates at 0.1 and 0.3 μM (N = 7, P < 0.05), and reduced SAN beating rates at 0.3 μM (N = 6, P < 0.05). However, neither edoxaban (1 μM) nor rivaroxaban (0.3 μM) reduced PV spontaneous beating rates in the presence of 1 μM BMS200261 (an inhibitor of protease-activated receptors type 1, PAR1 inhibitor) or 10 μM ranolazine (an inhibitor of late sodium current, INa-late inhibitor). Edoxaban (0.3 and 1 μM) and rivaroxaban (0.1 and 0.3 μM) respectively decreased the INa-late by 47%, 47%, 36%, and 49% (n = 9 PV cardiomyocytes from 5 rabbits, P < 0.05). In conclusion, Factor Xa inhibitors reduce PV spontaneous activities and may modulate occurrence of atrial fibrillation by inhibiting PAR1 and reducing the INa-late in PVs.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Chang CJ,Cheng CC,Chen YC,Higa S,Huang JH,Chen SA,Chen YJ

doi

10.1016/j.ejphar.2018.07.003

subject

Has Abstract

pub_date

2018-08-15 00:00:00

pages

462-471

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(18)30371-6

journal_volume

833

pub_type

杂志文章

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