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• W1898755691 abstract "Constitutive activation of the Wnt/beta-catenin pathway is thought to play a central role in colorectal carcinogenesis. A key output in this pathway is the nuclear level of beta-catenin, which determines the transcription of T-cell transcription factor (TCF)/lymphoid enhancer-binding factor-responsive target genes. In unstimulated cells, beta-catenin is continuously targeted for ubiquitin-dependent degradation, which depends on its NH(2)-terminal phosphorylation by glycogen synthase kinase-3beta (GSK-3beta) in association with a multiprotein complex. Previously, we have shown that the nonsteroidal anti-inflammatory drugs (NSAIDs) aspirin and indomethacin down-regulate beta-catenin/TCF signaling in colorectal cancer cells. Here, we demonstrate that the reduced signaling activity of beta-catenin in response to NSAIDs is a result of its enhanced phosphorylation. In SW948 and SW480 colorectal cancer cells, phosphorylation of NH(2)-terminal S/T residues time dependently increased in response to aspirin and indomethacin. In contrast, in 293 cells, NSAID treatment failed to induce detectable levels of beta-catenin phosphorylation but resulted in degradation of beta-catenin within 24 h in serum-deprived cells. The aspirin-induced beta-catenin phosphorylation in colon cancer cells preceded down-regulation of beta-catenin/TCF signaling, suggesting a causal relationship. Inhibition of this process by LiCl pointed to participation of GSK-3beta. Unexpectedly, GSK-3beta was also phosphorylated upon aspirin treatment in six colorectal cancer cell lines. We present evidence that inactivation of a phosphatase rather than stimulation of a kinase or interference with the ubiquitination machinery may be the cause of the stabilized phosphorylation. The data emphasize the importance of beta-catenin in the pathogenesis of colorectal cancer and define it as a key target for anticancer therapeutics." @default.
• W1898755691 created "2016-06-24" @default.
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• W1898755691 date "2003-06-01" @default.
• W1898755691 modified "2023-09-26" @default.
• W1898755691 title "Reduction of beta-catenin/T-cell transcription factor signaling by aspirin and indomethacin is caused by an increased stabilization of phosphorylated beta-catenin." @default.
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