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Platelet function in sickle cell disease during steady state.

P Triadou1, E Fonty, A S Ambrosio

  • 1Laboratoire d'Hématologie, Hôpital Necker-Enfants Malades, Paris, France.

Nouvelle Revue Francaise D'Hematologie
|January 1, 1990
PubMed
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Sickle cell disease patients show increased platelet activity in whole blood tests, but decreased activity in plasma tests, indicating in vivo platelet activation. This suggests a potential role for platelet activation and coagulation in sickle cell disease pathophysiology.

Area of Science:

  • Hematology
  • Vascular Biology
  • Thrombosis

Background:

  • Sickle cell disease (SCD) is a genetic blood disorder characterized by abnormal hemoglobin.
  • Platelet activation and coagulation are implicated in SCD pathophysiology, but their precise role requires further elucidation.

Purpose of the Study:

  • To investigate platelet function and activation markers in patients with sickle cell disease during steady state.
  • To explore the interaction between sickle cells and platelets in whole blood and plasma.

Main Methods:

  • Platelet aggregation was measured in whole blood, platelet-rich plasma (PRP), and washed platelets from 37 SCD patients and controls.
  • Plasma levels of beta-thromboglobulin (beta TG), platelet factor 4 (PF4), and fibrinopeptide A (FPA) were quantified.

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Main Results:

  • Whole blood platelet aggregation, reflecting sickle cell-platelet interaction, was increased in SCD patients.
  • Classical platelet aggregation in PRP showed decreased activity in SCD patients.
  • Levels of beta TG, PF4, and FPA were elevated in SCD patients, suggesting in vivo platelet stimulation and coagulation activation.

Conclusions:

  • Platelet function in SCD is complex, with evidence of in vivo activation ('exhaustion' in vitro) and potential hypercoagulability.
  • Findings suggest a significant role for platelet activation and coagulation pathways in the pathophysiology of sickle cell disease.