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- W2149016816 abstract "Abstract Cancer cells often gain advantage by reducing the tumor-suppressive activity of transforming growth factor-β (TGF-β) together with stimulation of its oncogenic activity as in Ras-transformed cells; however, molecular mechanisms remain largely unknown. TGF-β activates both its type I receptor (TβRI) and c-Jun NH2-terminal kinase (JNK), which phosphorylate Smad2 and Smad3 at the COOH-terminal (pSmad2/3C) and linker regions (pSmad2/3L). Here, we report that Ras transformation suppresses TβRI-mediated pSmad3C signaling, which involves growth inhibition by down-regulating c-Myc. Instead, hyperactive Ras constitutively stimulates JNK-mediated pSmad2/3L signaling, which fosters tumor invasion by up-regulating plasminogen activator inhibitor-1 and matrix metalloproteinase-1 (MMP-1), MMP-2, and MMP-9. Conversely, selective blockade of linker phosphorylation by a mutant Smad3 lacking JNK-dependent phosphorylation sites results in preserved tumor-suppressive function via pSmad3C in Ras-transformed cells while eliminating pSmad2/3L–mediated invasive capacity. Thus, specific inhibition of the JNK/pSmad2/3L pathway should suppress cancer progression by shifting Smad-dependent signaling from oncogenesis to tumor suppression. [Cancer Res 2007;67(11):5090–6]" @default.
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- W2149016816 date "2007-06-01" @default.
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- W2149016816 title "Reversible Smad-Dependent Signaling between Tumor Suppression and Oncogenesis" @default.
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- W2149016816 doi "https://doi.org/10.1158/0008-5472.can-06-4629" @default.
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