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Bmx is a downstream Rap1 effector in VEGF-induced endothelial cell activation
Konstantin V Stoletov1, Bruce I Terman
1Cardiology Division, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Biochemical and Biophysical Research Communications
|June 23, 2004
Summary
Vascular Endothelial Growth Factor (VEGF) activates endothelial cell migration via Rap1 signaling. This study identifies Bmx tyrosine kinase as a key downstream effector, crucial for this process.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Vascular Endothelial Growth Factor (VEGF) signaling is critical for endothelial cell migration.
- The downstream effectors of Rap1, a key mediator in VEGF signaling, remain largely unknown.
Purpose of the Study:
- To identify downstream effectors of Rap1 in VEGF-induced endothelial cell migration.
- To elucidate the role of the Bmx non-receptor tyrosine kinase in this signaling pathway.
Main Methods:
- Utilized antibody array filters to identify Rap1-interacting proteins.
- Performed immunoprecipitation and Western blotting to confirm Rap1/Bmx complex formation.
- Assessed the impact of Bmx kinase inhibition on VEGF-induced cell migration.
Main Results:
- Identified 10 potential Rap1-interacting proteins, including Bmx.
- Confirmed that VEGF treatment promotes the formation of a Rap1/Bmx complex.
- VEGF treatment recruits Bmx to the CAS scaffolding protein.
- Inhibition of Bmx kinase activity blocked VEGF-induced endothelial cell migration.
- Rap1 signaling is required for Bmx complex formation.
Conclusions:
- Bmx non-receptor tyrosine kinase is a downstream effector of Rap1 in VEGF-induced endothelial cell activation.
- The Rap1/Bmx signaling axis plays a significant role in endothelial cell migration.