NDLI: The Wnt antagonist sFRP1 is downregulated in premalignant large bowel adenomas

Content Provider	PubMed Central
Author	Caldwell, G. M. Jones, C. E. Taniere, P. Warrack, R. Soon, Y. Matthews, G. M. Morton, D. G.
Copyright Year	2006
Abstract	Our previous studies have implicated the Wnt antagonist, sFRP1, as a tumour suppressor gene in advanced colorectal cancer. In this study, we set out to investigate the relationship between sFRP1 expression and large bowel adenomas, a precursor of colorectal cancer. The induction of β-catenin/TCF mediated transcription is both a frequent early event in colorectal neoplasia, and a key downstream effect of wnt growth factor signalling. Lithium treatment of a small bowel mucosal cell line (FHs 74 int) induced sFRP1 within 8 h, indicating that this gene is positively regulated by β-catenin, contrasting with the suppression of sFRP1 expression, we saw previously in advanced colorectal cancers. We therefore investigated a series of 12 adenomas and matched large bowel mucosa samples. Real-time RT–PCR analysis showed a reduction in sFRP1 expression in all 12 dysplastic lesions (median 485-fold, IQR 120- to 1500-fold), indicating factors other than β-catenin influence sFRP1 levels. In a second series of 11 adenomas, we identified methylation of the sFRP1 promotor region in all 11 samples, and this was increased compared with the surrounding normal mucosa in seven cases. Immunohistochemical analysis using a polyclonal antibody supported these findings, with sFRP1 expression reduced in many of the adenoma samples examined. sFRP1 staining in normal mucosa adjacent to the dysplastic tissue was also reduced compared with the normal controls, suggesting that sFRP1 expression may be suppressed in a field of mucosa rather than in individual cells. This study identifies sFRP1 inactivation at the premalignant stage of colorectal cancer development, indicating that these pathways may be useful targets for chemoprevention strategies in this common solid tumour.
Related Links	http://dx.doi.org/10.1038/sj.bjc.6602967
Ending Page	927
Page Count	6
Starting Page	922
File Format	PDF
ISSN	00070920
e-ISSN	15321827
Journal	British Journal of Cancer
Issue Number	6
Volume Number	94
Language	English
Publisher	Nature Publishing Group
Publisher Date	2006-03-27
Access Restriction	Open
Rights Holder	Nature Publishing Group
Subject Keyword	Cancer Research Oncology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cancer Research Oncology

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