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Herein we report that the prosurvival sphingolipid sphingosine 1-phosphate regulates the activities of both Bad and Bax during apoptosis of Jurkat cells. First, sphingosine 1-phosphate treatment results in Bad inactivation via the ERK/Rsk-1 pathway. Second, sphingosine 1-phosphate blocks the translocation of Bax to the mitochondria induced by Fas ligation. MEK inhibition by PD98059 or U0126 not only...
Apoptosis is an essential feature of development and homeostasis in higher organisms. Lipid rafts are subdomains of the plasma membrane that contain high concentrations of cholesterol and sphingolipids. In response to intra or extracellular stimuli, lipid rafts can include or exclude proteins to variable extents. This favors specific protein-protein interactions and modulates the activity of signaling...
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