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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
Published on: May 23, 2025
Serotonergic mechanisms enhance platelet-mediated thrombogenicity
Ana M Galan1, Irene Lopez-Vilchez, Maribel Diaz-Ricart
1Servicio de Hemoterapia-Hemostaia, Hospital Clinic, CDB, IDIBAPS, UB, 08036 Barcelona, Spain. agalan@clinic.ub.es
Thrombosis and Haemostasis
|September 1, 2009
Summary
Serotonin (5-HT) significantly enhances human platelet activation, promoting blood clot formation and increasing thrombotic risk. Selective serotonin reuptake inhibitors (SSRIs) show promising antithrombotic effects, warranting further investigation.
Area of Science:
- Cardiovascular Science
- Hematology
- Pharmacology
Background:
- Serotonin (5-HT) is traditionally considered a weak agonist for human platelets.
- Emerging evidence links serotonergic pathways to cardiovascular risk.
- The precise role of 5-HT in platelet function and thrombosis requires clarification.
Purpose of the Study:
- To investigate the effects of serotonin (5-HT) on human platelet adhesive, cohesive, and procoagulant properties.
- To assess the impact of 5-HT on whole blood coagulation and thrombin generation.
- To evaluate 5-HT's role in in-vitro thrombus formation under flow conditions and the potential modulation by selective serotonin reuptake inhibitors (SSRIs).
Main Methods:
- Modified thromboelastometry (TEM) for whole blood coagulation.
- Specific fluorogenic assays for thrombin generation.
- In-vitro perfusion model using human flowing blood to assess thrombus formation.
- Evaluation of platelet activation markers (CD62-P) and procoagulant molecule expression.
- Assessment of SSRI effects on 5-HT-induced platelet activation and thrombosis.
Main Results:
- Serotonin (5-HT) significantly enhanced platelet activation, evidenced by increased CD62-P and procoagulant molecule expression, particularly with calcium (Ca++) and/or ADP.
- 5-HT accelerated clotting times, augmented clot strength in whole blood TEM, and enhanced thrombin generation in platelet-rich plasma (PRP).
- In perfusion studies, 5-HT increased fibrin deposition at low shear and enhanced platelet thrombus formation at high shear.
- Selective serotonin reuptake inhibitors (SSRIs) attenuated 5-HT's prothrombotic effects, with greater impact under shear conditions.
Conclusions:
- Serotonin (5-HT) is a potent agonist for human platelets, not a weak one.
- 5-HT accentuates platelet activation, potentiates procoagulant responses, and increases thrombogenesis on damaged vascular surfaces.
- SSRIs demonstrate significant antithrombotic actions, suggesting potential therapeutic applications that warrant further investigation.
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