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The regulation of primary mesenchyme cell patterning
1Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213.
Developmental Biology
|August 1, 1990
Summary
Sea urchin primary mesenchyme cells (PMCs) flexibly migrate and pattern, demonstrating that their developmental sites accept extra cells. The basal lamina and embryonic environment guide PMC morphogenesis and skeleton formation.
Area of Science:
- Developmental Biology
- Marine Biology
- Cell Biology
Background:
- Primary mesenchyme cells (PMCs) in sea urchin embryos are crucial for skeleton formation.
- Understanding PMC regulation is key to deciphering early embryonic morphogenesis.
Purpose of the Study:
- To investigate the regulatory mechanisms governing PMC migration and patterning.
- To determine how altered numbers of PMCs affect their morphogenetic behaviors.
Main Methods:
- Experimentally altering PMC numbers in sea urchin embryos.
- Tracking PMC movements using fluorescent dye labeling (rhodamine B isothiocyanate).
- Utilizing a PMC-specific monoclonal antibody (6a9) for cell identification.
Main Results:
- Individual PMCs can integrate into any pattern position, refuting cell subpopulation sorting.
- All pattern sites accommodate increased cell numbers without competition.
- Supernumerary PMCs participate in normal-sized skeleton formation.
- Specific basal lamina sites enhance spicule elongation irrespective of cell number.
Conclusions:
- The basal lamina, blastocoel matrix, and embryonic epithelium are critical regulators of PMC morphogenesis.
- PMCs exhibit remarkable plasticity in responding to patterning cues.
- Postmigratory PMCs can re-pattern if introduced into younger embryos, highlighting environmental influence.