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Vol. 18, Issue 3, 910-918, March 2007

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Lack of Adenomatous Polyposis Coli Protein Correlates with a Decrease in Cell Migration and Overall Changes in Microtubule Stability

Karin Kroboth^*, Ian P. Newton^*, Katsuhiro Kita, Dina Dikovskaya^*, Jürg Zumbrunn^*,, Clare M. Waterman-Storer, and Inke S. Näthke^*

*Division of Cell and Developmental Biology, School of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom; and Department of Cell Biology, The Scripps Research Institute, La Jolla, CA 92037

Submitted March 6, 2006; Revised December 4, 2006; Accepted December 18, 2006
Monitoring Editor: Paul Forscher

Most sporadic colorectal tumors carry truncation mutations in the adenomatous polyposis coli (APC) gene. The APC protein is involved in many processes that govern gut tissue. In addition to its involvement in the regulation of -catenin, APC is a cytoskeletal regulator with direct and indirect effects on microtubules. Cancer-related truncation mutations lack direct and indirect binding sites for microtubules in APC, suggesting that loss of this function contributes to defects in APC-mutant cells. In this study, we show that loss of APC results in disappearance of cellular protrusions and decreased cell migration. These changes are accompanied by a decrease in overall microtubule stability and also by a decrease in posttranslationally modified microtubules in the cell periphery particularly the migrating edge. Consistent with the ability of APC to affect cell shape, the overexpression of APC in cells can induce cellular protrusions. These data demonstrate that cell migration and microtubule stability are linked to APC status, thereby revealing a weakness in APC-deficient cells with potential therapeutic implications.

The online version of this article contains supplemental material at MBC Online (http://www.molbiolcell.org).

Present address: Polyphor Ltd., Gewerbestrasse 14, CH-4123 Allschwil, Switzerland.

Address correspondence to: Inke S. Näthke (inke{at}lifesci.dundee.ac.uk)

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