Thromb Haemost 2019; 119(04): 645-659
DOI: 10.1055/s-0039-1678706
Cellular Haemostasis and Platelets
Georg Thieme Verlag KG Stuttgart · New York

Platelet Apoptosis and PAI-1 are Involved in the Pro-Coagulant State of Immune Thrombocytopaenia Patients Treated with Thrombopoietin Receptor Agonists

Raul Justo Sanz
1   Hematology Unit, Hospital Universitario La Paz-IdiPAZ, Madrid, Spain
,
Elena Monzón Manzano
1   Hematology Unit, Hospital Universitario La Paz-IdiPAZ, Madrid, Spain
,
Ihosvany Fernández Bello
1   Hematology Unit, Hospital Universitario La Paz-IdiPAZ, Madrid, Spain
,
Maria Teresa Álvarez Román
1   Hematology Unit, Hospital Universitario La Paz-IdiPAZ, Madrid, Spain
,
Mónica Martín Salces
1   Hematology Unit, Hospital Universitario La Paz-IdiPAZ, Madrid, Spain
,
Maria Isabel Rivas Pollmar
1   Hematology Unit, Hospital Universitario La Paz-IdiPAZ, Madrid, Spain
,
Víctor Jiménez Yuste
1   Hematology Unit, Hospital Universitario La Paz-IdiPAZ, Madrid, Spain
2   Universidad Autónoma de Madrid, Madrid, Spain
,
Nora V. Butta
1   Hematology Unit, Hospital Universitario La Paz-IdiPAZ, Madrid, Spain
› Institutsangaben
Funding This work was supported by grants from the FIS-FONDOS FEDER (PI15/01457, N.V.B.).
Weitere Informationen

Publikationsverlauf

24. Oktober 2018

12. Dezember 2018

Publikationsdatum:
11. Februar 2019 (online)

Abstract

The treatment goal for patients with immune thrombocytopaenia (ITP) is to raise platelet counts to levels that minimize or stop bleeding. Thrombopoietin receptor agonists (TPO-RAs) have been successfully and extensively employed as second-line therapy for ITP. However, TPO-RAs have a small but significant increase in the risk of thrombosis. The aim of this study was to elucidate the mechanisms involved in the pro-coagulant effect of TPO-RAs to take them into account when considering their use in ITP patients with concomitant diseases/conditions that might increase risk of suffering thrombotic events. Eighty-two patients with chronic primary ITP (40 untreated and 42 undergoing TPO-RA therapy) and 112 healthy individuals were recruited. The patients with ITP undergoing TPO-RA therapy presented a pro-coagulant profile due to the formation of a more fibrinolysis-resistant clot because of increased plasminogen activator inhibitor-1 (PAI-1) levels. Increase in platelet content of PAI-1 might be the result of the effect of TPO-RA during megakaryopoiesis, as suggested by experiments performed in MEG-01 cells. Moreover, patients under TPO-RA treatment presented an enhanced pro-coagulant activity associated with microparticles and an increased platelet apoptosis that causes a higher exposure of phosphatidylserine and, consequently, a larger surface for the binding of the prothrombinase complex.

Authors' Contributions

R.J.S., E.M.M. and I.F.B. performed the experiments. M.T.A.R., M.M.S., M.I.R.P. and V.J.-Y. diagnosed, provided clinical care and verified patient information of immune thrombocytopaenia patients. All authors analysed the results. N.V.B. was the principal investigator, designed the experiments and wrote the manuscript. All authors approved the manuscript.


 
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