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FGF receptor signalling is required to maintain neural progenitors during Hensen's node progression
L Mathis1, P M Kulesa, S E Fraser
1Biological Imaging Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, USA.
Nature Cell Biology
|June 5, 2001
Summary
Fibroblast growth factor (FGF) signaling maintains neural progenitor cells near Hensen's node, crucial for posterior nervous system development. This discovery explains previous mixed findings on FGF's role in embryonic axis growth.
Area of Science:
- Developmental biology
- Neuroscience
- Molecular signaling
Background:
- Previous studies in mice suggested progenitor cells disperse rostrocaudally from Hensen's node.
- A localized signal is hypothesized to maintain a proliferative stem zone in the node.
Purpose of the Study:
- To test and confirm the inferred pattern of cell contribution from Hensen's node in chicken embryos.
- To investigate the role of fibroblast growth factor (FGF) signaling in maintaining the neural progenitor stem zone.
Main Methods:
- Electroporation of a green fluorescent protein (GFP) expression vector into chicken embryos near Hensen's node.
- Co-electroporation of a dominant-negative FGF receptor with a lineage marker to assess FGF signaling's impact.
Main Results:
- A model was established where displaced cells contribute to the growing embryonic axis.
- Inhibition of FGF receptor signaling significantly altered spinal cord primordium elongation.
- FGF receptor signaling was shown to maintain presumptive neural progenitors in the Hensen's node region.
Conclusions:
- FGF receptor signaling is essential for maintaining the stem zone near Hensen's node.
- This signaling pathway promotes continuous development of the posterior nervous system.
- Provides a potential explanation for varied observations regarding FGF in embryonic axis development.