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- W2100000108 abstract "Wnt-1 acts as a mammary oncogene when ectopically expressed in the mouse mammary gland. APC is a tumor suppressor gene, mutations in which cause intestinal tumorigenesis in humans and rodents. Both Wnt-1 expression and APC mutation activate a common signaling pathway involving transcriptional activation mediated by beta-catenin/Tcf complexes, but few targets relevant to carcinogenesis have yet been identified. Expression of the inducible prostaglandin synthase cyclooxygenase-2 appears critical for intestinal tumorigenesis resulting from APC mutation, suggesting that cyclooxygenase-2 might be a transcriptional target for beta-catenin/Tcf complexes. Here, we have investigated the effect of Wnt-1 on cyclooxygenase-2 expression. Wnt-1 expression in the mouse mammary epithelial cell lines RAC311 and C57MG induces stabilization of cytosolic beta-catenin and morphological transformation. Expression of Wnt-1 in these cells caused transcriptional up-regulation of the cyclooxygenase-2 gene, resulting in increased levels of cyclooxygenase-2 mRNA and protein. Prostaglandin E2 production was increased as a consequence of the elevated cyclooxygenase-2 activity and could be decreased by treatment with a selective cyclooxygenase-2 inhibitor. Cyclooxygenase-2 thus appears to be a common downstream target for APC mutation and Wnt-1 expression. In view of the critical role of cyclooxygenase-2 in intestinal tumorigenesis, cyclooxygenase-2 up-regulation in response to Wnt signaling may contribute to Wnt-induced mammary carcinogenesis." @default.
- W2100000108 created "2016-06-24" @default.
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- W2100000108 date "1999-04-01" @default.
- W2100000108 modified "2023-09-23" @default.
- W2100000108 title "Transcriptional activation of cyclooxygenase-2 in Wnt-1-transformed mouse mammary epithelial cells." @default.
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