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Development, Vol 122, Issue 9 2895-2902, Copyright © 1996 by Company of Biologists
JOURNAL ARTICLES |
U Dahl, A Sjodin and H Semb
Department of Microbiology, University of Umea, Sweden.
It is thought that the cadherin protein family of cell adhesion molecules regulates morphogenetic events in multicellular organisms. In this study we have investigated the importance of beta-cell cadherins for cell-cell interactions mediating the organization of endocrine cells into pancreatic islets of Langerhans. To interfere with endogenous cadherin activity in beta-cells during pancreatic development, we overexpressed a dominant negative mutant of mouse E-cadherin, lacking nearly all extracellular amino acids, in pancreatic beta-cells in transgenic mice. Expression of the truncated E-cadherin receptor displaced both E- and N-cadherin from pancreatic beta-cells. As a result, the initial clustering of beta-cells, which normally begins at 13.5-14.5 days postcoitum, was perturbed. Consequently, the clustering of endocrine cells into islets, which normally begins at 17.5-18 days postcoitum, was abrogated. Instead, transgenic beta-cells were found dispersed in the tissue as individual cells, while alpha-cells selectively aggregated into islet-like clusters devoid of beta-cells. Furthermore, expression of truncated E-cadherin in beta-cells resulted in an accumulation of beta-catenin in the cytoplasm. Thus, we have for the first time shown in vivo that cadherins regulate adhesive properties of beta-cells which are essential for the aggregation of endocrine cells into islets.
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