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Thrombospondin-1-induced migration is functionally dependent upon focal adhesion kinase
Xiu-Jie Wang1, Kristopher Maier, Shoichi Fuse
1Section of Vascular Surgery, Yale University School of Medicine, New Haven, CT, USA.
Vascular and Endovascular Surgery
|March 6, 2008
Summary
Focal adhesion kinase (FAK) plays a key role in thrombospondin-1-induced vascular smooth muscle cell migration. Inhibiting FAK phosphorylation significantly reduced cell migration, highlighting its importance in vascular disease progression.
Area of Science:
- Cell Biology
- Vascular Biology
- Biochemistry
Background:
- Vascular smooth muscle cell (VSMC) migration is a critical process in the development of vascular diseases.
- Thrombospondin-1 (TSP-1) has been previously identified as an activator of focal adhesion kinase (FAK) in VSMCs.
Purpose of the Study:
- To investigate the role of focal adhesion kinase (FAK) in thrombospondin-1 (TSP-1)-induced vascular smooth muscle cell migration.
- To determine if FAK is essential for TSP-1-mediated VSMC migration.
Main Methods:
- Bovine aortic smooth muscle cells were transfected with FAK-specific plasmids (FAK397, FAK-wild type) or control plasmids (pcDNA, beta-Gal).
- Cell migration assays were performed using TSP-1 or serum-free medium in transfected cells, with or without the FAK inhibitor geldanamycin.
- Immunoprecipitation and Western blot analyses were utilized to assess TSP-1-induced FAK phosphorylation.
Main Results:
- Transfection with FAK397 significantly inhibited TSP-1-induced FAK phosphorylation and VSMC migration (P < .05).
- The FAK inhibitor geldanamycin also significantly reduced TSP-1-induced VSMC migration (P < .05).
- FAK397 transfection demonstrated inhibition of TSP-1-induced tyrosine phosphorylation.
Conclusions:
- Focal adhesion kinase (FAK) is critically involved in mediating thrombospondin-1 (TSP-1)-induced vascular smooth muscle cell migration.
- Inhibition of FAK phosphorylation effectively blocks TSP-1-stimulated VSMC migration, suggesting FAK as a potential therapeutic target in vascular diseases.
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