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Del1 mediates VSMC adhesion, migration, and proliferation through interaction with integrin alpha(v)beta(3)
Mehrdad Rezaee1, Kalyani Penta, Thomas Quertermous
1Donald W. Reynolds Cardiovascular Clinical Research Center, Stanford University School of Medicine, Stanford, California 94305, USA.
Summary
Del1 protein promotes vascular smooth muscle cell adhesion, migration, and proliferation by interacting with alpha(v)beta(3)-integrins. This suggests Del1 plays a paracrine role in blood vessel development and repair after injury.
Area of Science:
- Vascular Biology
- Cellular Signaling
- Extracellular Matrix Proteins
Background:
- Del1 is an embryonic matrix protein involved in endothelial cell signaling via alpha(v)beta(3)-integrins.
- Vascular endothelial cells utilize Del1 for autocrine angiogenic pathways.
Purpose of the Study:
- To investigate the paracrine signaling role of Del1 in vascular smooth muscle cells (VSMC).
- To determine if Del1 influences VSMC adhesion, migration, proliferation, and apoptosis.
Main Methods:
- VSMC were treated with varying concentrations of Del1.
- Cell adhesion and migration assays were performed.
- Alpha(v)beta(3)-integrin function was blocked using PCN-RGD peptide and specific antibodies.
- Actin filament organization and focal contact formation were examined.
- VSMC proliferation and apoptosis were assessed.
Main Results:
- Del1 dose-dependently promoted VSMC adhesion and migration.
- These effects were mediated by alpha(v)beta(3)-integrins.
- VSMC adhesion to Del1 involved actin filament organization and focal contact formation.
- Del1 inhibited VSMC apoptosis, thereby supporting proliferation.
Conclusions:
- Del1 acts as a paracrine factor influencing VSMC behavior.
- Del1 signaling through alpha(v)beta(3)-integrins is crucial for VSMC adhesion, migration, and survival.
- Reactivated Del1 expression in vascular injury suggests a role in vessel wall remodeling.