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Cell interactions and mesodermal cell fates in the sea urchin embryo
1Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA 15213.
Development (Cambridge, England). Supplement
|January 1, 1992
Summary
Primary mesenchyme cells (PMCs) signal to secondary mesenchyme cells (SMCs) during sea urchin gastrulation, suppressing skeletogenesis in some SMCs and directing them to alternative fates. This interaction is crucial for mesodermal cell fate determination.
Area of Science:
- Developmental biology
- Marine biology
- Cell biology
Background:
- Cell interactions are critical for cell fate determination during embryonic development.
- In sea urchin embryos, mesodermal cell populations, primary mesenchyme cells (PMCs) and secondary mesenchyme cells (SMCs), interact to regulate developmental pathways.
Purpose of the Study:
- To review the cellular basis of the interaction between PMCs and SMCs in sea urchin gastrulation.
- To elucidate the mechanisms regulating secondary mesenchyme cell fate determination.
Main Methods:
- Cell transplantation and ablation experiments
- Fluorescent cell labeling techniques
- Analysis of cell type-specific molecular markers
Main Results:
- PMCs suppress the skeletogenic potential of a subpopulation of SMCs via a signal transmitted during gastrulation.
- This PMC-SMC interaction directs affected SMCs towards alternative developmental pathways.
- Direct filopodial contact between PMCs and SMCs occurs during the late gastrula stage, coinciding with signal transmission.
Conclusions:
- The interaction between PMCs and SMCs is a key regulatory mechanism for mesodermal cell fate in sea urchin embryos.
- SMC fate switching is influenced by timing, quantitative characteristics, and direct cellular contact with PMCs.
- Understanding this interaction provides insights into developmental plasticity and evolutionary processes.