Sodium late current blockers in ischemia reperfusion: is the bullet magic?
We describe the discovery of the first selective, potent, and voltage-dependent inhibitor of the late current mediated by the cardiac sodium channel Na V1.5. The compound 3,4-dihydro- N-[(2 S)-3-[(2-methoxyphenyl)thio]-2-methylpropyl]-2 H-(3 R)-1,5-benzoxathiepin-3-amine, 2a (F 15845), was identified from a novel family of 3-amino-1,5-benzoxathiepine derivatives. The late sodium current inhibition and antiischemic effects of 2a were studied in various models in vitro and in vivo. In a rabbit model of ischemia-reperfusion, 2a exhibited more potent antiischemic effects than reference compounds KC 12291, ranolazine, and ivabradine. Thus, after a single administration, 2a almost abolished ST segment elevation in response to a transient coronary occlusion. Further, the antiischemic activity of 2a is maintained over a wide range of doses and is not associated with any hemodynamic changes, contrary to conventional antiischemic agents. The unique pharmacological profile of 2a opens new and promising opportunities for the treatment of ischemic heart diseases.
Le Grand
Bruno
B
Cardiovascular 2 Division, Pierre Fabre Research Center, 17 Avenue Jean Moulin, 81106 Castres Cedex, France.
Pignier
Christophe
C
Létienne
Robert
R
Cuisiat
Florence
F
Rolland
Françoise
F
Mas
Agnes
A
Vacher
Bernard
B
D000818:Animals; D004305:Dose-Response Relationship, Drug; D004594:Electrophysiology; D005260:Female; D006168:Guinea Pigs; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008958:Models, Molecular; D015394:Molecular Structure; D017202:Myocardial Ischemia / Q000188:drug therapy*; D011817:Rabbits; D051381:Rats; D017208:Rats, Wistar; D015424:Reperfusion; D026941:Sodium Channel Blockers / Q000138:chemical synthesis / Q000737:chemistry* / Q000627:therapeutic use*; D013329:Structure-Activity Relationship
D026941:Sodium Channel Blockers