Article: Dose-dependent alteration of rat cardiac sodium current by isoproterenol: results from direct measurements on multicellular preparations.
Pflugers Archiv : European journal of physiology
1996 Volume 431, Issue 3, Page(s) 395–401
Abstract: Conflicting results have been reported in literature about the influence of beta-adrenergic stimulation on the fast cardiac sodium current (INa+). To elucidate these mechanisms in multicellular preparations we used the loose-patch-clamp technique to ... ...
Abstract | Conflicting results have been reported in literature about the influence of beta-adrenergic stimulation on the fast cardiac sodium current (INa+). To elucidate these mechanisms in multicellular preparations we used the loose-patch-clamp technique to evaluate the effect of the beta-adrenergic agonist isoproterenol 1-1000 nmol/l. Isoproterenol enhanced INa+ at all membrane potentials by elevation of the maximal available INa+ . Only at the high concentration of 1 micromol/l was INa+ slightly depressed after depolarizing conditioning clamps. The most marked increase of the maximal available INa+ was 30+/-9% after application of 100 nmol/l isoproterenol. To learn about the mechanisms in view of sodium channel modulation we combined isoproterenol with the sodium channel blocker lidocaine (47 micromol/l). Under these circumstances the effects of both drugs were completely independent. This investigation shows clearly that low concentrations of isoproterenol increase INa+ in multicellular preparations by a gating-independent mechanism. |
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MeSH term(s) | Animals ; Anti-Arrhythmia Agents/pharmacology ; Cardiotonic Agents/pharmacology ; Dose-Response Relationship, Drug ; Female ; Isoproterenol/pharmacology ; Lidocaine/pharmacology ; Papillary Muscles/chemistry ; Rats ; Rats, Wistar ; Sodium Channel Blockers ; Sodium Channels/physiology ; Time Factors |
Chemical Substances | Anti-Arrhythmia Agents ; Cardiotonic Agents ; Sodium Channel Blockers ; Sodium Channels ; Lidocaine (98PI200987) ; Isoproterenol (L628TT009W) |
Language | English |
Publishing date | 1996-01 |
Publishing country | Germany |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 6380-0 |
ISSN | 1432-2013 ; 0031-6768 |
ISSN (online) | 1432-2013 |
ISSN | 0031-6768 |
DOI | 10.1007/bf02207277 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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