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• W2006371301 abstract "Ras-mediated transformation is associated with upregulation of cyclooxygenase-2 (COX-2), which in turn promotes prostaglandin E2 (PGE2) synthesis and secretion. Although recent studies have identified molecular mechanisms by which Ras mediates upregulation of COX-2, conflicting observations have been made. Furthermore, while COX-2 upregulation has been shown to be important for Ras transformation, the signaling pathways initiated by PGE2-stimulation of EP family of heterotrimeric G protein-coupled receptors (GPCR) and contribution of PGE2 signaling to Ras-mediated transformation are issues that remain unresolved. In this study, we first determined that Raf effector pathway activation of the extracellular-regulated kinase (ERK) mitogen-activated protein kinase (MAPK) cascade alone was sufficient and necessary for COX-2 and PGE2 upregulation. However, Raf-independent regulation of the c-jun N-terminal kinase (JNK) and p38 MAPK cascades is also involved in COX-2 and PGE2 upregulation, with the JNK and p38 pathways exhibiting opposing roles in COX-2 and PGE2 upregulation. Furthermore, in contrast to previous studies, we found that an epidermal growth factor (EGF) receptor autocrine growth mechanism, another Raf-independent signaling mechanism, was necessary for COX-2 and PGE2 upregulation. Second, we determined that inhibition of EP1/2 receptor function blocked growth transformation by Ras, demonstrating that PGE2 upregulation is a key transforming function of COX-2. Finally, we found that PGE2 stimulated the activation of Ras and ERK, but not Akt, and reduced matrix deprivation-induced apoptosis, in untransformed epithelial cells. In summary, our studies define additional, multiple signaling mechanisms that promote COX-2 and PGE2 expression and show that COX-2-stimulated PGE2-EP receptor signaling is required for growth and survival transformation by Ras. © 2007 Wiley-Liss, Inc." @default.
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• W2006371301 date "2007-01-01" @default.
• W2006371301 modified "2023-10-04" @default.
• W2006371301 title "Ras-mediated intestinal epithelial cell transformation requires cyclooxygenase-2-induced prostaglandin E2 signaling" @default.
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• W2006371301 doi "https://doi.org/10.1002/mc.20333" @default.
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