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Biochem Biophys Res Commun. 2010 Jan 1;391(1):921-5. doi: 10.1016/j.bbrc.2009.11.165. Epub 2009 Dec 4.

Syndecan-2 regulates cell migration in colon cancer cells through Tiam1-mediated Rac activation.

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Department of Life Sciences, Division of Life and Pharmaceutical Sciences and the Center for Cell Signaling & Drug Discovery Research, Ewha Womans University, Seoul 120-750, Republic of Korea.


Expression of the cell surface adhesion receptor syndecan-2 is known to be involved in the regulation of cancer cell migration. However, the molecular mechanism of syndecan-2-mediated cell migration remains unknown. Here we report that Rac contributes to the regulation of syndecan-2-mediated cancer cell migration. Overexpression of syndecan-2 enhanced migration and invasion of human colon adenocarcinoma cells Caco-2 and HCT116 cells. In parallel with the increased cell migration/invasion, syndecan-2 overexpression enhanced Rac activity, while dominant negative Rac (RacN17) diminished syndecan-2-mediated increased cancer cell migration. In addition syndecan-2 expression increased membrane localization of Tiam1 and syndecan-2-mediated cell migration/invasion of Caco-2 cells was diminished when Tiam1 levels were knocked-down with small inhibitory RNAs. Furthermore, oligomerization-defective syndecan-2 mutants failed to increase membrane localization of Tiam1, activation of Rac and subsequent cell migration of both Caco-2 and HCT116 cells. Taken together, these results suggest that syndecan-2 regulates cell migration of colon carcinoma cells through Tiam1-dependent Rac activation in colon cancer cells.

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