Differentiation of tubular and villous adenomas based on Wnt pathway-related gene expression profiles - PubMed (original) (raw)
Differentiation of tubular and villous adenomas based on Wnt pathway-related gene expression profiles
Anthony V Nguyen et al. Int J Mol Med. 2010 Jul.
Abstract
This study was undertaken to define whether differences in the expression of Wnt pathway components are present between normal colonic mucosa, early (tubular) adenomas and villous adenomas which have a higher malignant potential. Normal mucosa, tubular adenomas and villous adenomas were obtained from twelve patients. RNA was isolated and utilized for Wnt pathway-specific membrane array expression analysis. Quantitative real-time polymerase chain reaction (qRT-PCR) and fluorescent immunohistochemistry (IHC) were utilized for confirmatory analyses. Fifteen Wnt pathway-related genes showed differential expression between villous adenomas and normal mucosa and villous and tubular adenomas at a significance level of p<0.01. Genes involved in canonical Wnt (beta-catenin) signaling with increased expression in villous adenomas included wnt1, fz2, csnk2A2, pygo2, pygo1, frat2 and myc, the latter confirmed by qRT-PCR and IHC. Myc protein expression was confined primarily to stromal components of villous adenomas. Genes involved in non-canonical Wnt signaling with increased expression in villous adenomas included rho-u, daam1, damm2, cxxc4 and nlk. Successive increases in the expression of ctnnb1 (beta-catenin) from normal to tubular adenomas to villous adenomas was seen. The Wnt pathway gene expression profile can differentiate between tubular and villous adenomas. These data suggest that Wnt signaling regulation changes during the progression from normal mucosa to tubular adenomas to villous adenomas. Expression of Myc in adenoma stroma suggests a dynamic signaling network within adenomas between mucosal and stromal elements. Inhibition of the Wnt pathway may provide a novel approach for cancer prevention in patients with benign tubular adenomas.
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