Activities of the Wnt-1 class of secreted signaling factors are antagonized by the Wnt-5A class and by a dominant negative cadherin in early Xenopus development
| Autor: | Randall T. Moon, Susan M. Purcell, Monica Torres, Julia A. Yang-Snyder, Alyce A. DeMarais, L. Lynn McGrew |
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| Jazyk: | angličtina |
| Rok vydání: | 1996 |
| Předmět: |
Cell signaling
Beta-catenin Microinjections Xenopus Wnt1 Protein Protein Sorting Signals Xenopus Proteins Wnt-5a Protein Glycogen Synthase Kinase 3 Xenopus laevis Proto-Oncogene Proteins Animals Cell adhesion In Situ Hybridization beta Catenin biology Cadherin Wnt signaling pathway Cell Biology Articles Zebrafish Proteins biology.organism_classification Cadherins Immunohistochemistry Cell biology Wnt Proteins Cytoskeletal Proteins Calcium-Calmodulin-Dependent Protein Kinases biology.protein Trans-Activators RNA Ectopic expression Female Signal transduction Signal Transduction |
| Zdroj: | The Journal of Cell Biology |
| ISSN: | 1540-8140 0021-9525 |
| Popis: | When overexpressed in Xenopus embryos, Xwnt-1, -3A, -8 and -8b define a functional class of Wnts (the Wnt-1 class) that promotes duplication of the embryonic axis, whereas Xwnt-5A, -4, and -11 define a distinct class (the Wnt-5A class) that alters morphogenetic movements (Du, S., S. Purcell, J. Christian, L. McGrew, and R. Moon. 1995. Mol. Cell. Biol. 15:2625-2634). Since come embryonic cells may be exposed to signals from both functional classes of Wnt during vertebrate development, this raises the question of how the signaling pathways of these classes of Wnts might interact. To address this issue, we coexpressed various Xwnts and components of the Wnt-1 class signaling pathway in developing Xenopus embryos. Members of the Xwnt-5A class antagonized the ability of ectopic Wnt-1 class to induce goosecoid expression and a secondary axis. Interestingly, the Wnt-5A class did not block goosecoid expression or axis induction in response to overexpression of cytoplasmic components of the Wnt-1 signaling pathway, beta-catenin or a kinase-dead gsk-3, or to the unrelated secreted factor, BVg1. The ability of the Wnt-5A class to block responses to the Wnt-1 class may involve decreases in cell adhesion, since ectopic expression of Xwnt-5A leads to decreased Ca2+-dependent cell adhesion and the activity of Xwnt-5A to block Wnt-1 class signals is mimicked by a dominant negative N-cadherin. These data underscore the importance of cell adhesion in modulating the responses of embryonic cells to signaling molecules and suggest that the Wnt-5A functional class of signaling factors can interact with the Wnt-1 class in an antagonistic manner. |
| Databáze: | OpenAIRE |
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