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Developmental platelet endothelial cell adhesion molecule expression suggests multiple roles for a vascular adhesion
1Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
The American Journal of Pathology
|May 11, 1999
Summary
Platelet endothelial cell adhesion molecule (PECAM) marks early murine development in stem cells and embryos. Its expression suggests PECAM functions beyond the vascular and hematopoietic systems.
Area of Science:
- Developmental Biology
- Cell Biology
- Hematology
Background:
- Platelet endothelial cell adhesion molecule (PECAM) is a known marker for murine vasculature.
- PECAM is involved in vasculogenesis and angiogenesis.
- Its role in early mammalian development requires further investigation.
Purpose of the Study:
- To investigate PECAM expression during murine embryonic stem cell differentiation.
- To examine PECAM expression in early mouse embryos.
- To understand the broader functions of PECAM in mammalian development.
Main Methods:
- Studied PECAM expression in differentiating murine embryonic stem cells in vitro.
- Analyzed PECAM expression in preimplantation and postimplantation mouse embryos.
- Utilized immunofluorescence or similar techniques to detect PECAM localization.
Main Results:
- Undifferentiated ES cells express PECAM.
- Distinct PECAM-positive cells, not vascular endothelial cells, emerge during ES cell differentiation.
- PECAM expression is observed in preimplantation blastocysts and embryonic yolk sac mesodermal cells.
- PECAM expression is restricted to endothelial and some hematopoietic cells in later stages.
Conclusions:
- PECAM is expressed by undifferentiated cells, prevascular cell types, and vascular endothelial cells during murine development.
- Early PECAM expression in blastocysts and ES cells indicates potential roles outside the vascular/hematopoietic lineage.