Document Detail

Evidence for partial epithelial-to-mesenchymal transition (pEMT) and recruitment of motile blastoderm edge cells during avian epiboly.
MedLine Citation:
PMID:  21412939     Owner:  NLM     Status:  MEDLINE    
Embryonic epiboly has become an important developmental model for studying the mechanisms underlying collective movements of epithelial cells. In the last couple of decades, most studies of epiboly have utilized Xenopus or zebrafish as genetically tractable model organisms, while the avian epiboly model has received virtually no attention. Here, we re-visit epiboly in quail embryos and characterize several molecular markers of epithelial-to-mesenchymal transition (EMT) in the inner zone of the extraembryonic Area Opaca and at the blastoderm edge. Our results show that the intermediate filament vimentin, a widely-used marker for the mesenchymal phenotype, is strongly expressed in the edge cells compared to the cells in the inner zone. Laminin, an extracellular matrix protein that is a major structural and adhesive component of the epiblast basement membrane and the inner zone of the Area Opaca, is notably absent from the blastoderm edge. While these expression profiles are consistent with a mesenchymal phenotype, several other epithelial markers, including cytokeratin, β-catenin, and E-cadherin, are present in the blastoderm edge cells. Moreover, the results of a BrDU proliferation assay strongly suggest that expansion of the edge cell population is primarily due to recruitment of cells from the inner zone, as opposed to proliferation. Taken together, our data show that the edge cells of the avian blastoderm have characteristics of both epithelial and mesenchymal cells, and that the avian epiboly model, which has been dormant for so many years, may yet again prove to be helpful as a unique developmental model for studying partial EMT in the context of collective epithelial cell migration.
Matt A Futterman; Andrés J García; Evan A Zamir
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2011-03-15
Journal Detail:
Title:  Developmental dynamics : an official publication of the American Association of Anatomists     Volume:  240     ISSN:  1097-0177     ISO Abbreviation:  Dev. Dyn.     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-05-11     Completed Date:  2011-10-03     Revised Date:  2014-09-16    
Medline Journal Info:
Nlm Unique ID:  9201927     Medline TA:  Dev Dyn     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1502-11     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Wiley-Liss, Inc.
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MeSH Terms
Adherens Junctions / metabolism
Birds / embryology*,  metabolism
Blastoderm / cytology,  physiology*
Cadherins / metabolism
Cell Movement* / physiology
Cell Proliferation
Cells, Cultured
Chick Embryo
Embryo Culture Techniques
Embryo, Nonmammalian
Embryonic Development / physiology
Epithelial-Mesenchymal Transition / physiology*
Laminin / metabolism
Quail / embryology,  genetics,  metabolism,  physiology
beta Catenin / metabolism
Grant Support
Reg. No./Substance:
0/Cadherins; 0/Laminin; 0/beta Catenin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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