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Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
Published on: October 27, 2009
High shear flow induces migration of adherent human platelets
Bjoern F Kraemer1, Christine Schmidt, Benjamin Urban
1Universitätsklinikum Tübingen, Medizinische Klinik III für Herz-und Kreislauferkrankungen, Tübingen, Germany.
Platelets
|March 19, 2011
Summary
Platelets, previously thought static, can now be seen as mobile cells. They migrate towards stromal-derived factor-1 (SDF-1) and high shear stress, potentially aiding vascular repair.
Area of Science:
- Cardiovascular Biology
- Cellular Physiology
- Biomedical Engineering
Background:
- Shear forces are integral to vascular health and disease.
- Endothelial cells and platelets respond to shear stress.
- Platelets were traditionally viewed as stationary adhesion sites.
Purpose of the Study:
- To investigate platelet migration in response to shear stress and SDF-1.
- To elucidate the molecular mechanisms underlying flow-induced platelet migration.
- To establish a novel role for platelets as mobile cells in vascular dynamics.
Main Methods:
- Studied platelet behavior under controlled flow conditions.
- Analyzed platelet accumulation in response to SDF-1 gradients.
- Examined cytoskeletal organization and key protein phosphorylation (WASP, FAK) under shear stress.
Main Results:
- Platelets accumulate in areas with high SDF-1 concentrations under flow.
- High shear stress induces platelet polarization, cytoskeletal changes, and directed migration.
- Increased Wiskott-Aldrich Syndrome protein (WASP) phosphorylation and focal adhesion kinase (FAK) redistribution were observed.
Conclusions:
- Platelets exhibit migratory capacity in response to shear stress and SDF-1.
- This flow-induced platelet migration represents a newly recognized function.
- Platelet motility may be crucial for covering intimal lesions and promoting vascular repair.
