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Necrotic platelets provide a procoagulant surface during thrombosis.

Vu Minh Hua1, Latasha Abeynaike1, Elias Glaros1

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A specific platelet type, identified by GSAO labeling, drives clot formation through regulated necrosis. Targeting this pathway may reduce pathological thrombosis even with aspirin therapy.

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Area of Science:

  • Hematology
  • Cell Biology
  • Thrombosis Research

Background:

  • Platelets play a critical role in hemostasis and thrombosis.
  • A procoagulant subpopulation of platelets is essential for thrombin burst and clot stability.
  • The precise identity and formation mechanism of these procoagulant platelets have remained unclear.

Purpose of the Study:

  • To identify and characterize the procoagulant platelet subpopulation.
  • To investigate the mechanism of formation of these platelets.
  • To explore potential therapeutic targets for pathological thrombosis.

Main Methods:

  • Utilized 4-[N-(S-glutathionylacetyl)amino]phenylarsonous acid (GSAO) as a cell death marker for platelet labeling.
  • Assessed platelet procoagulant potential by GSAO labeling and P-selectin exposure.
  • Investigated platelet formation in murine thrombosis models with genetic manipulation (cyclophilin D deletion).
  • Analyzed human platelets from subjects on aspirin therapy.

Main Results:

  • GSAO labeling identified a distinct platelet subpopulation with high procoagulant potential.
  • These GSAO(+) platelets are formed via regulated necrosis involving cyclophilin D.
  • GSAO(+) platelets were found in occluding thrombi and support fibrin formation.
  • Procoagulant platelets form despite aspirin therapy but can be attenuated by inhibiting the necrosis pathway.

Conclusions:

  • The major procoagulant platelet subpopulation involved in fibrin formation arises from regulated necrosis.
  • Cyclophilin D is a key mediator in the formation of these procoagulant platelets.
  • Targeting the necrosis pathway offers a potential therapeutic strategy for thrombosis, independent of initial platelet activation.