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Journal of Cell Science, Vol 114, Issue 7 1309-1319, Copyright © 2001 by Company of Biologists
JOURNAL ARTICLES |
P Goichberg, M Shtutman, A Ben-Ze'ev and B Geiger
Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot, Israel. benny.geiger@weizmann.ac.il
Cadherin-mediated cell adhesion is involved in muscle differentiation from early stages of myogenic induction to late stages of myoblast interaction and fusion. (&bgr;)-Catenin is a major constituent of cadherin-based adherens junctions and also serves as a signal transduction molecule that regulates gene expression during development. In this study, we explored the involvement of (&bgr;)-catenin in myogenic differentiation. We show here that shortly after a switch from growth to differentiation medium, (&bgr;)-catenin translocates to cell-cell junctions and its levels increase. We further show that elevation of (&bgr;)-catenin levels, induced either by inhibition of its breakdown, using LiCl, or by its overexpression, suppresses the formation of adherens junctions, resulting in a sharp decline in myogenin expression and an arrest of myogenic progression. Recruitment of (&bgr;)-catenin to adherens junctions after transfection with N-cadherin restores myogenin expression in the transfected cells. These results suggest that increased cadherin-mediated adhesion and translocation of (&bgr;)-catenin to adherens junctions are involved in activating the early steps of myogenic differentiation.
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