Published 3 January 2005. doi:10.1083/jcb.200409067
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 168, Number 1, 29-33
Glycogen synthase kinase-3 is an endogenous inhibitor of Snail transcription
:
implications for the epithelialmesenchymal transition
Robin E. Bachelder1,
Sang-Oh Yoon1,
Clara Franci2,
Antonio García de Herreros2, and
Arthur M. Mercurio1
1 Department of Pathology, Division of Cancer Biology and Angiogenesis, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
2 Unitat de Biologia Cellular i Molecular, Institut Municipal d'Investigació Mèdica, Universitat Pompeu Fabra, 08003 Barcelona, Spain
Correspondence to Robin E. Bachelder: rbacheld{at}bidmc.harvard.edu
Abstract
We report that the activity of glycogen synthase kinase-3 (GSK-3) is necessary for the maintenance of the epithelial architecture. Pharmacological inhibition of its activity or reducing its expression using small interfering RNAs in normal breast and skin epithelial cells results in a reduction of E-cadherin expression and a more mesenchymal morphology, both of which are features associated with an epithelialmesenchymal transition (EMT). Importantly, GSK-3 inhibition also stimulates the transcription of Snail, a repressor of E-cadherin and an inducer of the EMT. We identify NF
B as a transcription factor inhibited by GSK-3 in epithelial cells that is relevant for Snail expression. These findings indicate that epithelial cells must sustain activation of a specific kinase to impede a mesenchymal transition.
Abbreviations used in this paper: EMT, epithelialmesenchymal transition; GSK-3, glycogen synthase kinase-3; siRNA, small interfering RNA.

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