Medicinal and Pharmaceutical Chemistry Commons^™

Ouabain Interaction With Cardiac Na+/K+-Atpase Initiates Signal Cascades Independent Of Changes In Intracellular Na+ And Ca2+, Jiang Liu, Jiang Tian, Michael Haas, Joseph I. Shapiro, Amir Askari, Zijian Xie

Pharmaceutical Science and Research

We have shown previously that partial inhibition of the cardiac myocyte Na⁺/K⁺-ATPase activates signal pathways that regulate myocyte growth and growth-related genes and that increases in intracellular Ca²⁺ concentration ([Ca²⁺]i) and reactive oxygen species (ROS) are two essential second messengers within these pathways. The aim of this work was to explore the relation between [Ca²⁺]i and ROS. When myocytes were in a Ca²⁺-free medium, ouabain caused no change in [Ca²⁺]i, but it increased ROS as it did when the cells were in …