Abstract
Desmoid tumors (aggressive fibromatosis) are locally invasive soft tissue tumors in which β-catenin-mediated TCF-3-dependent transcription is activated. To provide more insight into the pathophysiology of these tumors, expression profiles were generated using oligonucleotide arrays (Affymetrix). In total, 69 differentially expressed genes were identified in desmoids compared to normal fibroblasts (fascia) from the same patients. The differential expression of a selection of genes was confirmed using RT–PCR and Northern blotting. We further evaluated the insulin-like growth factor-binding protein 6 (IGFBP-6), a gene that was consistently downregulated in all desmoids tested. Promotor studies and electromobility shift assays revealed two functional β-catenin/TCF-responsive elements in the human IGFBP-6 promoter. These findings suggest that IGFBP-6 is directly downregulated by the β-catenin/TCF complex in desmoid tumors, and imply a role for the IGF axis in the proliferation of desmoid tumors.
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Acknowledgements
The following investigators generously provided plasmids: Dr D Strong (p1731luc), Dr B Vogelstein (S33 β-catenin), Dr P Polakis (delta N89 β-catenin); Dr F Dc Cormick (dnTCF). We thank Professor I De Wever, Professor R Sciot and Professor D Uyttendaele for providing samples, Professor R Winkler for the IGFII protein assays and Dr K Verschueren for technical assistance with the EMSA experiments. H Denys is a fellow of the Fund for Scientific Research-Flanders (FSR). A Jadidizadeh and S Amini Nik are supported by the Iranian Ministry of Health and Medical Education. BA Alman is supported by the Canadian Research Chairs Program. This work was funded by grant G.033.02 from ‘Kom op Tegen Kanker’, Fund for Scientific Research-Flanders, Belgium, by grant I.32.2000.F-13 from the Belgian Federation Against Cancer, and by the National Cancer Institute of Canada.
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Denys, H., Jadidizadeh, A., Amini Nik, S. et al. Identification of IGFBP-6 as a significantly downregulated gene by β-catenin in desmoid tumors. Oncogene 23, 654–664 (2004). https://doi.org/10.1038/sj.onc.1207160
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DOI: https://doi.org/10.1038/sj.onc.1207160


