Abstract
Epithelial–mesenchymal transition (EMT) is a process in which epithelial cells are converted into mesenchymal cells. It plays crucial roles in the formation of complex organs and in tissue repair during animal development. After EMT, cells acquire migratory and invasive properties, which can contribute to organ fibrosis and cancer metastasis. However, the precise cellular mechanisms that govern EMT in various in vivo contexts are poorly understood. Gastrulation is a process through which the three embryonic germ layers are formed. During this process, epithelial cells in the epiblast layer dynamically change their shape and ingress through the primitive streak to become mesoderm or endoderm. EMT occurs during this gastrulation process, and in this chapter, I describe the key principles of EMT and characterize EMT in the primitive streak during chicken gastrulation. Gastrulation EMT is a multistep process that includes the dissociation of cell–cell contact, the loss of epithelial polarity, and the degradation of the basement membrane (BM). Our recent studies indicate that epiblast/BM interaction requires basally localized RhoA activity, and CLASP- and dystroglycan-mediated cortical microtubule anchoring, the disruption of which causes BM degradation during gastrulation EMT.
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Acknowledgments
This study was carried out in the laboratory of Dr. Guojun Sheng at RIKEN CDB. I thank Ms. Erike W. Sukowati for supporting most of the experiments and also thank Ms. Hazuki Hiraga and Dr. Guojun Sheng for corrections and critical comments on the manuscript.
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Nakaya, Y. (2014). Interaction of Epithelial Cells and Basement Membrane in the Regulation of EMT Exemplified in Chicken Embryo Gastrulation. In: Kondoh, H., Kuroiwa, A. (eds) New Principles in Developmental Processes. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54634-4_9
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DOI: https://doi.org/10.1007/978-4-431-54634-4_9
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