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- W2186827854 abstract "We showed before that Na + -K + -ATPase is also a signal transducer in neonatal rat cardiac myocytes. Binding of ouabain to the enzyme activates multiple signal pathways that regulate cell growth. The aims of this work were to extend such studies to adult cardiac myocytes and to determine whether the signal-transducing function of Na + /K + -ATPase regulates the well-known effects of ouabain on intracellular Ca 2+ concentration ([Ca 2+ ] i ). In adult myocytes, ouabain activated protein tyrosine phosphorylation and p42/44 mitogen-activated protein kinases (MAPKs), increased production of reactive oxygen species (ROS), and raised both systolic and diastolic [Ca 2+ ] i . Pretreatment of myocytes with several Src kinase inhibitors, or overexpression of a dominant negative Ras, antagonized ouabain-induced activation of MAPKs and increases in [Ca 2+ ] i . Treatment with PD-98059 (a MAPK kinase inhibitor) or overexpression of a dominant negative MAPK kinase 1 also ablated the effect of ouabain on MAPKs and [Ca 2+ ] i . N-acetyl-cysteine, which blocks the effect of ouabain on ROS, did not prevent the ouabain-induced rise in [Ca 2+ ] i . Clearly, the activation of the Ras/MAPK cascade, but not ROS generation, is necessary for ouabain-induced increases in [Ca 2+ ] i in rat cardiac myocytes." @default.
- W2186827854 created "2016-06-24" @default.
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- W2186827854 date "2001-11-01" @default.
- W2186827854 modified "2023-10-07" @default.
- W2186827854 title "Signal-transducing function of Na<sup>+</sup>-K<sup>+</sup>-ATPase is essential for ouabain's effect on [Ca<sup>2+</sup>]<sub>i</sub>in rat cardiac myocytes" @default.
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- W2186827854 doi "https://doi.org/10.1152/ajpheart.2001.281.5.h1899" @default.
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