Human discs large and scrib are localized at the same regions in colon mucosa and changes in their expression patterns are correlated with loss of tissue architecture during malignant progression

International Journal of Cancer. Journal International Du Cancer
D GardiolL Banks

Abstract

Loss of cell polarity is one of the hallmarks of malignant carcinomas. Most of the understanding about the link between cell polarity and proliferation control comes from studies on the Drosophila tumor suppressors discs large (Dlg), scribble (Scrib) and lethal giant larvae (lgl). Mammalian homologues of these proteins have been described and are conserved in sequence and function. Human Dlg (hDlg) and Scrib were independently shown to be down-regulated during malignant progression. This, and other lines of evidence, points toward the participation of both hDlg and hScrib in a common pathway involved in polarity control and tumor suppression. We investigated the correlation between the expression of both proteins in tissues and their relative contributions to the maintenance of tissue architecture during colon cancer development. We analyzed the levels and distribution of hDlg and hScrib by immunohistochemistry, using serial sections of the same sample. We used normal and neoplastic colon mucosa, since it offers a good model for analyzing these features in progressive dysplastic stages. The results demonstrate that both proteins localize at the same regions in polarized colon epithelia, and that in normal samples the proteins' ...Continue Reading

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