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Microfluidics in Assessing Platelet Function
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Mechanical confinement prevents ectopic platelet release.

Ines Guinard1, Noémie Brassard-Jollive1, Laurie Ruch1

  • 1University of Strasbourg, INSERM, Etablissement Français du Sang (EFS) Grand-Est, UMR_S1255 Biologie et Pharmacologie des Plaquettes Sanguines (BPPS), FMTS, Strasbourg F-67065, France.

Proceedings of the National Academy of Sciences of the United States of America
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PubMed
Summary

Bone marrow

Keywords:
3D culturecytoskeletonmechanical confinementmegakaryocytemyelosuppression

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Area of Science:

  • Hematology
  • Cell Biology
  • Biophysics

Background:

  • Megakaryocytes (MKs) in the bone marrow produce blood platelets.
  • Platelet release involves MKs extending proplatelets or budding into the bloodstream.
  • Mechanisms regulating this release are not fully understood.

Purpose of the Study:

  • Investigate the role of microenvironmental mechanical properties in regulating platelet formation and release.
  • Identify pathways preventing premature platelet release within the bone marrow stroma.

Main Methods:

  • Utilized inert viscoelastic hydrogels to simulate bone marrow mechanical constraints.
  • Performed transcriptional analysis to identify relevant cellular pathways.
  • Assessed Rho-GTPase activation, myosin light chain phosphorylation, and F-actin dynamics.
  • Used latrunculin-A to modulate F-actin and observe effects on proplatelet formation.
  • Examined intact bone marrow ex vivo and in vivo.

Main Results:

  • Mechanical confinement in the marrow stroma inhibits proplatelet formation, unlike the bloodstream.
  • Loss of marrow confinement (e.g., myelosuppression) leads to ectopic platelet release.
  • Mechanical stress upregulates Rho-GTPase pathway genes, increasing intracellular tension and F-actin.
  • Decreasing F-actin with latrunculin-A promotes proplatelet formation within confined environments.
  • High intracellular tension forms a peripheral zone in MKs, which resolves in liquid milieu to enable platelet release.

Conclusions:

  • Microenvironmental mechanics, specifically confinement-mediated intracellular tension, prevent premature platelet release in the bone marrow.
  • The Rho-GTPase pathway and F-actin dynamics are key regulators of this process.
  • Understanding these mechanisms is crucial for pathologies affecting bone marrow mechanics, such as chemotherapy or myelofibrosis.