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Updated: Mar 8, 2026
Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets
Published on: November 22, 2024
Platelet tissue factor activity and membrane cholesterol are increased in hypercholesterolemia and normalized by
Olga Panes1, César González1, Patricia Hidalgo1
1Department of Hematology-Oncology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
Insights
High LDL-cholesterol increases platelet tissue factor procoagulant activity (TF-PCA) in hypercholesterolemic patients. Rosuvastatin normalized this activity, suggesting a new therapeutic target for atherothrombosis.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Pharmacology
Background:
- High LDL-cholesterol and platelet activation are key in atherothrombosis.
- Platelet tissue factor procoagulant activity (TF-PCA) role in hypercholesterolemia is unexplored.
- Statins and anti-platelet drugs are standard cardiovascular treatments.
Purpose of the Study:
- Investigate platelet TF-PCA and its link to membrane cholesterol in hypercholesterolemia.
- Compare the effects of atorvastatin and rosuvastatin on platelet TF-PCA.
Main Methods:
- Studied platelet TF-PCA in vitro and in hypercholesterolemic (HC) patients vs. controls.
- Induced platelet TF-PCA via GPIbα activation with VWF-ristocetin.
- Assessed effects of 1-month statin treatment (atorvastatin/rosuvastatin).
Main Results:
- Cholesterol-enriched platelets showed increased aggregation and FXa generation in vitro.
- HC patients had higher platelet cholesterol, TF protein, and TF-PCA.
- Rosuvastatin, unlike atorvastatin, normalized platelet cholesterol, TF protein, and TF-PCA.
Conclusions:
- Hypercholesterolemia increases platelet TF-PCA, specifically after VWF-induced GPIbα activation.
- Rosuvastatin normalized platelet TF-PCA, suggesting a novel pleiotropic effect.
- Modulating platelet TF-PCA may offer a new strategy for atherothrombosis treatment.
Background And Aims:
High plasma LDL-cholesterol (LDL-C) and platelet responses have major pathogenic roles in atherothrombosis. Thus, statins and anti-platelet drugs constitute mainstays in cardiovascular prevention/treatment. However, the role of platelet tissue factor-dependent procoagulant activity (TF-PCA) has remained unexplored in hypercholesterolemia. We aimed to study platelet TF-PCA and its relationship with membrane cholesterol in vitro and in 45 hypercholesterolemic patients (HC-patients) (LDL-C >3.37 mmol/L, 130 mg/dL) and 37 control subjects (LDL-C <3.37 mmol/L). The effect of 1-month administration of 80 mg/day atorvastatin (n = 21) and 20 mg/day rosuvastatin (n = 24) was compared.
Methods:
Platelet TF-PCA was induced by GPIbα activation with VWF-ristocetin.
Results:
Cholesterol-enriched platelets in vitro had augmented aggregation/secretion and platelet FXa generation (1.65-fold increase, p = 0.01). HC-patients had 1.5-, 2.3- and 2.5-fold increases in platelet cholesterol, TF protein and activity, respectively; their platelets had neither hyper-aggregation nor endogenous thrombin generation (ETP). Rosuvastatin, but not atorvastatin, normalized platelet cholesterol, TF protein and FXa generation. It also increased slightly the plasma HDL-C levels, which correlated negatively with TF-PCA.
Conclusions:
Platelets from HC-patients were not hyper-responsive to low concentrations of classical agonists and had normal PRP-ETP, before and after statin administration. However, washed platelets from HC-patients had increased membrane cholesterol, TF protein and TF-PCA. The platelet TF-dependent PCA was specifically expressed after VWF-induced GPIbα activation. Rosuvastatin, but not atorvastatin treatment, normalized the membrane cholesterol, TF protein and TF-PCA in HC-patients, possibly unveiling a new pleiotropic effect of rosuvastatin. Modulation of platelet TF-PCA may become a novel target to prevent/treat atherothrombosis without increasing bleeding risks.
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