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Gredler ML, Zallen JA. Multicellular rosettes link mesenchymal-epithelial transition to radial intercalation in the mouse axial mesoderm. Dev Cell 2023:S1534-5807(23)00134-X. [PMID: 37080203 DOI: 10.1016/j.devcel.2023.03.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 01/25/2023] [Accepted: 03/24/2023] [Indexed: 04/22/2023]
Abstract
Mesenchymal-epithelial transitions are fundamental drivers of development and disease, but how these behaviors generate epithelial structure is not well understood. Here, we show that mesenchymal-epithelial transitions promote epithelial organization in the mouse node and notochordal plate through the assembly and radial intercalation of three-dimensional rosettes. Axial mesoderm rosettes acquire junctional and apical polarity, develop a central lumen, and dynamically expand, coalesce, and radially intercalate into the surface epithelium, converting mesenchymal-epithelial transitions into higher-order tissue structure. In mouse Par3 mutants, axial mesoderm rosettes establish central tight junction polarity but fail to form an expanded apical domain and lumen. These defects are associated with altered rosette dynamics, delayed radial intercalation, and formation of a small, fragmented surface epithelial structure. These results demonstrate that three-dimensional rosette behaviors translate mesenchymal-epithelial transitions into collective radial intercalation and epithelial formation, providing a strategy for building epithelial sheets from individual self-organizing units in the mammalian embryo.
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Affiliation(s)
- Marissa L Gredler
- Howard Hughes Medical Institute and Developmental Biology Program, Sloan Kettering Institute, New York, NY, USA
| | - Jennifer A Zallen
- Howard Hughes Medical Institute and Developmental Biology Program, Sloan Kettering Institute, New York, NY, USA.
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Koyama H, Suzuki M, Yasue N, Sasaki H, Ueno N, Fujimori T. Differential Cellular Stiffness Contributes to Tissue Elongation on an Expanding Surface. Front Cell Dev Biol 2022; 10:864135. [PMID: 35425767 PMCID: PMC9001851 DOI: 10.3389/fcell.2022.864135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 03/03/2022] [Indexed: 12/02/2022] Open
Abstract
Pattern formation and morphogenesis of cell populations is essential for successful embryogenesis. Steinberg proposed the differential adhesion hypothesis, and differences in cell–cell adhesion and interfacial tension have proven to be critical for cell sorting. Standard theoretical models such as the vertex model consider not only cell–cell adhesion/tension but also area elasticity of apical cell surfaces and viscous friction forces. However, the potential contributions of the latter two parameters to pattern formation and morphogenesis remain to be determined. In this theoretical study, we analyzed the effect of both area elasticity and the coefficient of friction on pattern formation and morphogenesis. We assumed the presence of two cell populations, one population of which is surrounded by the other. Both populations were placed on the surface of a uniformly expanding environment analogous to growing embryos, in which friction forces are exerted between cell populations and their expanding environment. When the area elasticity or friction coefficient in the cell cluster was increased relative to that of the surrounding cell population, the cell cluster was elongated. In comparison with experimental observations, elongation of the notochord in mice is consistent with the hypothesis based on the difference in area elasticity but not the difference in friction coefficient. Because area elasticity is an index of cellular stiffness, we propose that differential cellular stiffness may contribute to tissue elongation within an expanding environment.
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Affiliation(s)
- Hiroshi Koyama
- Division of Embryology, National Institute for Basic Biology (Div. Embryology, NIBB), Okazaki, Japan.,Department of Basic Biology, School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Hayama, Japan
| | - Makoto Suzuki
- Department of Basic Biology, School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Hayama, Japan.,Division of Morphogenesis, National Institute for Basic Biology (Div. Morphogenesis, NIBB), Okazaki, Japan.,Amphibian Research Center, Graduate School of Integrated Sciences for Life, Hiroshima University (ARC, Hiroshima Univ.), Higashihiroshima, Japan
| | - Naoko Yasue
- Division of Morphogenesis, National Institute for Basic Biology (Div. Morphogenesis, NIBB), Okazaki, Japan
| | - Hiroshi Sasaki
- Laboratory for Embryogenesis, Graduate School of Frontier Biosciences, Osaka University (FBS, Osaka Univ.), Suita, Japan
| | - Naoto Ueno
- Department of Basic Biology, School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Hayama, Japan.,Division of Morphogenesis, National Institute for Basic Biology (Div. Morphogenesis, NIBB), Okazaki, Japan
| | - Toshihiko Fujimori
- Division of Embryology, National Institute for Basic Biology (Div. Embryology, NIBB), Okazaki, Japan.,Department of Basic Biology, School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Hayama, Japan
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