sarcoplasmic/endoplasmic reticulum calcium atpase 2

Istaroxime hydrochloride (PST2744 hydrochloride) 是 Na+ K+-ATPase 抑制剂和肌浆 内质网钙ATP酶2 (SERCA 2) 激活剂，是一种新型正性肌力化合物，可用于研究急性心力衰竭。

Istaroxime, also known as PST-2744, is a positive inotropic agent that mediates its action through inhibition of sodium/potassium adenosine triphosphatase (Na+/K+ ATPase). Na+/K+ ATPase inhibition increases intracellular sodium levels, which reverses the driving force of the sodium/calcium exchanger, inhibiting calcium extrusion and possibly facilitating calcium entry. Additionally, Istaroxime increases intracellular calcium by improving the efficacy by which intracellular calcium triggers sarcoplasmic reticulum calcium release, and by accelerating the inactivation state of L-type calcium channels, which allow for calcium influx.

Istaroxime is an effective inhibitor of Na+, K+-ATPase (IC50: 0.11 μM).