PEA3 Is Up-regulated in Response to Wnt1 and Activates the Expression of Cyclooxygenase-2

Louise R. Howe, Howard C. Crawford, Kotha Subbaramaiah, John A. Hassell, Andrew J. Dannenberg, Anthony M.C. Brown

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Abstract

The inducible prostaglandin synthase cyclooxygenase-2 (COX-2) is aberrantly expressed in intestinal tumors resulting from APC mutation, and is also transcriptionally up-regulated in mouse mammary epithelial cells in response to Wntl expression. β-Catenin stabilization is a consequence of both APC mutation and Wnt signaling. We have previously observed coordinate regulation of the matrilysin promoter by β-catenin and Ets family transcription factors of the PEA3 subfamily. Here we show that while β-catenin only weakly activates the COX-2 promoter, PEA3 family transcription factors are potent activators of COX-2 transcription. Consistent with this, PEA3 is up-regulated in Wntl-expressing mouse mammary epithelial cells, and PEA3 factors are highly expressed in tumors from Wntl transgenic mice, in which Cox-2 is also up-regulated. Promoter mapping experiments suggest that the NF-IL6 site in the COX-2 promoter is important for mediating PEA3 responsiveness. The NF-IL6 site is also important for COX-2 transcription in some colorectal cancer lines (Shao, J., Sheng, H., Inoue, H., Morrow, J. D., and DuBois, R. N. (2000) J. BioL Chem. 275, 33951-33956), and PEA3 factors are highly expressed in colorectal cancer cell lines. Therefore, we speculate that PEA3 factors may contribute to the up-regulation of COX-2 expression resulting from both APC mutation and Wntl expression.

Original languageEnglish (US)
Pages (from-to)20108-20115
Number of pages8
JournalJournal of Biological Chemistry
Volume276
Issue number23
DOIs
StatePublished - Jun 8 2001

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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Howe, L. R., Crawford, H. C., Subbaramaiah, K., Hassell, J. A., Dannenberg, A. J., & Brown, A. M. C. (2001). PEA3 Is Up-regulated in Response to Wnt1 and Activates the Expression of Cyclooxygenase-2. Journal of Biological Chemistry, 276(23), 20108-20115. https://doi.org/10.1074/jbc.M010692200