[Demonstration of intracellular release of calcium induced by sodium ions in the auricular trabeculae of the frog].
In a Ca-free, Mg-free medium containing EGTA (10-3M) auricular trabecles develop a slow inward current which is a pure sodium current. After 12 min in this medium, it is still possible to obtain a phasic mechanical activity which shows a perfect correlation with the current. This kind of behavior indicates that a mechanism of sodium-induced calcium release is present at the level of some internal sites.
D000818:Animals; D002118:Calcium / Q000378:metabolism* / Q000502:physiology; D004594:Electrophysiology; D066298:In Vitro Techniques; D008274:Magnesium / Q000502:physiology; D009200:Myocardial Contraction; D009206:Myocardium / Q000378:metabolism*; D011893:Rana esculenta; D012964:Sodium / Q000502:physiology*
D012964:Sodium; D008274:Magnesium; D002118:Calcium
Physiologie animale. -Mise en évidence d'une libération intracellulaire de calcium induite par les ions sodium au niveau de trabécules auriculaires de Grenouille.