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Articles 31 - 32 of 32
Full-Text Articles in Medicinal and Pharmaceutical Chemistry
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
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 …
Intracellular Reactive Oxygen Species Mediate The Linkage Of Na+/K+-Atpase To Hypertrophy And Its Marker Genes In Cardiac Myocytes, Joseph I. Shapiro, Amir Askari, Zijian Xie, Peter Kometiani, Jie Li, Jiang Liu
Intracellular Reactive Oxygen Species Mediate The Linkage Of Na+/K+-Atpase To Hypertrophy And Its Marker Genes In Cardiac Myocytes, Joseph I. Shapiro, Amir Askari, Zijian Xie, Peter Kometiani, Jie Li, Jiang Liu
Pharmaceutical Science and Research
We showed before that in cardiac myocytes partial inhibition of Na+/K+-ATPase by nontoxic concentrations of ouabain causes hypertrophy and transcriptional regulations of growth-related marker genes through multiple Ca2+-dependent signal pathways many of which involve Ras and p42/44 mitogen-activated protein kinases. The aim of this work was to explore the roles of intracellular reactive oxygen species (ROS) in these ouabain-initiated pathways. Ouabain caused a rapid generation of ROS within the myocytes that was prevented by preexposure of cells to N-acetylcysteine (NAC) or vitamin E. These antioxidants also blocked or attenuated the following actions of …