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Integrin-mediated mechanotransduction requires its dynamic interaction with specific extracellular matrix (ECM)
S Jalali1, M A del Pozo, K Chen
1Department of Bioengineering and The Whitaker Institute of Biomedical Engineering, University of California, San Diego, La Jolla, CA 92093-0427, USA.
Summary
Fluid shear stress activates integrins in vascular endothelial cells, initiating intracellular signals. New integrin-extracellular matrix (ECM) connections are crucial for this mechanotransduction process.
Area of Science:
- Vascular Biology
- Cellular Mechanobiology
- Biochemistry
Background:
- Vascular endothelial cells experience fluid shear stress, a critical factor in cardiovascular health.
- Understanding how cells sense and respond to mechanical forces is fundamental to vascular biology.
Purpose of the Study:
- To investigate the role of integrins in transmitting fluid shear stress signals within vascular endothelial cells.
- To elucidate the mechanism of shear stress-induced mechanotransduction.
Main Methods:
- Endothelial cells were cultured on extracellular matrix (ECM) substrates.
- Integrin activation and association with intracellular proteins (Shc) were monitored under shear stress.
- Integrin-ECM interactions were blocked using specific inhibitors or antibodies to assess their necessity.
Main Results:
- Shear stress activated specific integrins when endothelial cells were on cognate ECM ligands.
- Blocking new integrin-ECM interactions prevented shear stress-induced integrin-Shc association.
- The dynamic formation of integrin-ECM bonds was identified as essential for signal transduction.
Conclusions:
- Integrins play a key role in converting fluid shear stress into intracellular signals in endothelial cells.
- The dynamic engagement of new integrin-ECM ligand interactions is critical for shear stress mechanotransduction.