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Regulatory signals for endothelial podosome formation
Clotilde Billottet1, Patricia Rottiers, Florence Tatin
1Institut Européen de Chimie-Biologie, Université Bordeaux 1, Pessac, France.
European Journal of Cell Biology
|April 10, 2008
Summary
Podosome formation in endothelial cells involves Cdc42, TC10, and TCL GTPases. Signaling pathway requirements for podosome assembly vary significantly across different endothelial cell models.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Podosomes are actin-rich adhesion structures found in myelomonocytic cells, dependent on Src and RhoGTPases.
- Podosomes in vascular cells, particularly endothelial cells, are inducible and regulated by various signaling pathways.
Purpose of the Study:
- To investigate the specific roles of Cdc42-related GTPases, Smads, and Protein Kinase Cs (PKCs) in endothelial podosome formation.
- To elucidate the diverse signaling mechanisms underlying podosome assembly in different endothelial cell models.
Main Methods:
- Utilized three distinct endothelial cell models to study podosome formation.
- Analyzed the contribution of specific GTPases (Cdc42, TC10, TCL) and PKCs (PKCalpha, PKCdelta) to podosome assembly.
Main Results:
- TC10 and TCL GTPases, in addition to Cdc42, can promote podosome formation in endothelial cells.
- PKCalpha's necessity for podosome formation is cell-model dependent, while PKCdelta is essential in endothelial cells but not smooth muscle cells.
- Signaling pathways regulating podosome assembly exhibit significant diversity despite conserved molecular composition.
Conclusions:
- Endothelial cell podosome formation is regulated by a broader range of GTPases than previously recognized.
- PKC isoforms play differential and context-dependent roles in podosome assembly.
- The study highlights the complex and varied signaling networks controlling podosome formation in endothelial cells.
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