Unidirectional Eph/ephrin signaling creates a cortical actomyosin differential to drive cell segregation
Cell segregation is the process by which cells self-organize to establish developmental boundaries, an essential step in tissue formation. Cell segregation is a common outcome of Eph/ephrin signaling, but the mechanisms remain unclear. In craniofrontonasal syndrome, X-linked mosaicism for ephrin-B1...
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| Veröffentlicht in: | The Journal of cell biology 2016-10, Vol.215 (2), p.217-229 |
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| container_title | The Journal of cell biology |
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| creator | O'Neill, Audrey K Kindberg, Abigail A Niethamer, Terren K Larson, Andrew R Ho, Hsin-Yi Henry Greenberg, Michael E Bush, Jeffrey O |
| description | Cell segregation is the process by which cells self-organize to establish developmental boundaries, an essential step in tissue formation. Cell segregation is a common outcome of Eph/ephrin signaling, but the mechanisms remain unclear. In craniofrontonasal syndrome, X-linked mosaicism for ephrin-B1 expression has been hypothesized to lead to aberrant Eph/ephrin-mediated cell segregation. Here, we use mouse genetics to exploit mosaicism to study cell segregation in the mammalian embryo and integrate live-cell imaging to examine the underlying cellular and molecular mechanisms. Our data demonstrate that dramatic ephrin-B1-mediated cell segregation occurs in the early neuroepithelium. In contrast to the paradigm that repulsive bidirectional signaling drives cell segregation, unidirectional EphB kinase signaling leads to cell sorting by the Rho kinase-dependent generation of a cortical actin differential between ephrin-B1- and EphB-expressing cells. These results define mechanisms of Eph/ephrin-mediated cell segregation, implicating unidirectional regulation of cortical actomyosin contractility as a key effector of this fundamental process. |
| doi_str_mv | 10.1083/jcb.201604097 |
| format | Article |
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Cell segregation is a common outcome of Eph/ephrin signaling, but the mechanisms remain unclear. In craniofrontonasal syndrome, X-linked mosaicism for ephrin-B1 expression has been hypothesized to lead to aberrant Eph/ephrin-mediated cell segregation. Here, we use mouse genetics to exploit mosaicism to study cell segregation in the mammalian embryo and integrate live-cell imaging to examine the underlying cellular and molecular mechanisms. Our data demonstrate that dramatic ephrin-B1-mediated cell segregation occurs in the early neuroepithelium. In contrast to the paradigm that repulsive bidirectional signaling drives cell segregation, unidirectional EphB kinase signaling leads to cell sorting by the Rho kinase-dependent generation of a cortical actin differential between ephrin-B1- and EphB-expressing cells. 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| subjects | Actins - metabolism Actomyosin - metabolism Animals Cell Count Cell Differentiation Cells Embryo, Mammalian - cytology Embryo, Mammalian - metabolism Ephrin-B1 - metabolism Green Fluorescent Proteins - metabolism HEK293 Cells Humans Kinases Mice Models, Biological Neuroepithelial Cells - cytology Neuroepithelial Cells - metabolism Receptors, Eph Family - metabolism rho-Associated Kinases - metabolism Rodents Signal Transduction Tissues |
| title | Unidirectional Eph/ephrin signaling creates a cortical actomyosin differential to drive cell segregation |
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