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21307168

Source:http://linkedlifedata.com/resource/pubmed/id/21307168

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pubmed-article:21307168pubmed:abstractTextObjective Deregulation of the Wnt signalling pathway by mutations in the Apc or ?-catenin genes underlies colorectal carcinogenesis. As a result, ?-catenin stabilises, translocates to the nucleus, and activates gene transcription. Intestinal tumours show a heterogeneous pattern of nuclear ?-catenin, with the highest levels observed at the invasion front. Activation of receptor tyrosine kinases in these tumour areas by growth factors expressed by surrounding stromal cells phosphorylate ?-catenin at tyrosine residues, which is thought to increase ?-catenin nuclear translocation and tumour invasiveness. This study investigates the relevance of ?-catenin tyrosine phosphorylation for Wnt signalling and intestinal tumorigenesis in vivo. Design A conditional knock-in mouse model was generated into which the phospho-mimicking Y654E modification in the endogenous ?-catenin gene was introduced. Results This study provided in vivo evidence that ?-catenin(E654) is characterised by reduced affinity for cadherins, increased signalling and strongly increased phosphorylation at serine 675 by protein kinase A (PKA). In addition, homozygosity for the ?-catenin(E654) targeted allele caused embryonic lethality, whereas heterozygosity predisposed to intestinal tumour development, and strongly enhanced Apc-driven intestinal tumour initiation associated with increased nuclear accumulation of ?catenin. Surprisingly, the expression of ?-catenin(E654) did not affect histological grade or induce tumour invasiveness. Conclusions A thus far unknown mechanism was uncovered in which Y654 phosphorylation of ?-catenin facilitates additional phosphorylation at serine 675 by PKA. In addition, in contrast to the current belief that ?-catenin Y654 phosphorylation increases tumour progression to a more invasive phenotype, these results show that it rather increases tumour initiation by enhancing Wnt signalling.lld:pubmed
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pubmed-article:21307168pubmed:articleTitle?-catenin tyrosine 654 phosphorylation increases Wnt signalling and intestinal tumorigenesis.lld:pubmed
pubmed-article:21307168pubmed:affiliationDepartment of Gastroenterology and Hepatology, Erasmus MC-University Medical Centre, room L-63, 's Gravendijkwal 230, 3015 CE, Rotterdam, The Netherlands. w.vanveelen@erasmusmc.nllld:pubmed
pubmed-article:21307168pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:21307168pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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