99%

Store at -20℃ for one year（Powder）；Store at 2-4℃ for two weeks；Store at -20℃ for six months after dissolution.

左xi孟旦；OR1259

yellow

DMSO : 52 mg/mL (185.5 mM)

Cardiac troponin C

Levosimendan is a calcium sensitizer acting through calcium-dependent binding to cardiac troponin C (cTnC). Levosimendan at 3 μM decreases the value of Ca50 from 2.73μM to 1.19 μM. levosimendan exhibits its calcium sensitizing effect through calcium-dependent binding to the N-terminal domain of cTnC. Levosimendan significantly hyperpolarizes resting potential of rat mesenteric arterial myocytes with an EC50 of 2.9 μM and maximal effect (19.5 mV) at 10 μM, probably through activation of a glibenclamide-sensitive K+ channel. Levosimendan has inotropic and lusitropic actions in failing human myocardium, with average maximum increase in twitch tension of 47% at a levosimendan concentration of 0.8 μM. Levosimendan causes rapid dose-dependent improvement in hemodynamic function in patients with decompensated heart failure.

Levosimendan at low concentrations (0.03 to 0.1 μM) acts preferably as a Ca2+ sensitizer, whereas at higher concentrations (0.1 to 0.3 μmol/L) its action as a phosphodiesterase inhibitor contributes to the positive inotropic effect.