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An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
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Mechanosensing alters platelet migration.

Hendrik von Eysmondt1, Jan Seifert1, Johannes Rheinlaender1

  • 1Institute of Applied Physics, University of Tübingen, Germany.

Acta Biomaterialia
|February 22, 2025
PubMed
Summary

Platelet migration and immune response are influenced by substrate stiffness. Stiff surfaces promote platelet migration, while soft surfaces inhibit it, impacting their role in inflammation and injury.

Keywords:
HaptotaxisMechanosensingPDMSPlatelet migrationSICM

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Area of Science:

  • Biophysics
  • Cell Biology
  • Immunology

Background:

  • Platelets are crucial for vascular health and immune responses, exhibiting haptotactic migration.
  • Platelets possess mechanosensing capabilities, altering behavior based on substrate stiffness.
  • The impact of substrate stiffness on platelet migration dynamics remained largely uninvestigated.

Purpose of the Study:

  • To investigate the influence of substrate stiffness on platelet migration behavior.
  • To elucidate the role of platelet mechanosensing in their migratory response to varying substrate elasticities.

Main Methods:

  • Migration assays using fibrinogen-coated polydimethylsiloxane (PDMS) substrates of varying stiffness (5 kPa, 100 kPa, 2 MPa).
  • Phase-contrast and fluorescence microscopy coupled with deep learning for tracking platelet migration distance and velocity.
  • Scanning ion conductance microscopy (SICM) for imaging platelet morphology and fibrinogen density gradient analysis.

Main Results:

  • Platelets exhibited significant migration on stiff (2 MPa) and intermediate (100 kPa) stiffness substrates, but not on soft (5 kPa) substrates.
  • Platelet migration velocity and the fraction of migrating platelets were reduced on intermediate stiffness substrates compared to stiff ones.
  • Soft substrates inhibited platelet polarization, shape change, and fibrinogen removal, essential for migration, unlike stiff substrates.

Conclusions:

  • Substrate stiffness significantly influences platelet migration, with optimal migration occurring on stiff substrates (>100 kPa).
  • Platelet mechanosensing plays a critical role in their response to the mechanical properties of the microenvironment.
  • These findings suggest altered platelet immune responses in inflammatory or injured tissues with varying stiffness.