{"title":"Impaired fibrinolysis in JAK2V617F-related myeloproliferative neoplasms","authors":"Marie-Charlotte Bourrienne , Stéphane Loyau , Dorothée Faille , Juliette Gay , Séléna Akhenak , Carine Farkh , Véronique Ollivier , Mialitiana Solonomenjanahary , Sébastien Dupont , Christine Choqueux , Jean-Luc Villeval , Isabelle Plo , Valérie Edmond , Benoît Ho-Tin-Noé , Nadine Ajzenberg , Mikaël Mazighi","doi":"10.1016/j.jtha.2024.07.031","DOIUrl":null,"url":null,"abstract":"<div><h3>Background</h3><div>Myeloproliferative neoplasms (MPNs) are characterized by a high rate of thrombotic complications that contribute to morbidity and mortality. MPN-related thrombogenesis is assumed to be multifactorial, involving both procoagulant and proinflammatory processes. Whether impaired fibrinolysis also participates in the prothrombotic phenotype of MPN has been poorly investigated.</div></div><div><h3>Objectives</h3><div>We determined whether MPN, particularly <em>JAK2</em>V617F-positive MPN, is associated with fibrinolytic changes.</div></div><div><h3>Methods</h3><div>Tissue-type plasminogen activator (tPA)–mediated fibrinolysis was evaluated both in whole blood and plasma from mice with a hematopoietic-restricted Jak2<sup>V617F</sup> expression compared with wild-type (WT) mice (Jak2<sup>WT</sup>) using (1) halo clot lysis, (2) front lysis, and (3) plasmin generation assays. tPA clot lysis assay was performed in the plasma from 65 MPN patients (<em>JAK2</em>V617F mutation, <em>n</em> = 50; <em>CALR</em> mutations, <em>n</em> = 9) compared with 28 healthy controls.</div></div><div><h3>Results</h3><div>In whole blood from Jak2<sup>V617F</sup> mice, we observed a decreased fibrinolysis characterized by a significantly lower halo clot lysis rate compared with Jak2<sup>WT</sup> (95 ± 22 vs 147 ± 39 AU/min; <em>P</em> < .05). Similar results were observed in plasma (halo clot lysis rate, 130 ± 27 vs 186 ± 29 AU/min; front lysis rate, 2.8 ± 1.6 vs 6.1 ± 1.2 μm.min<sup>−1</sup>; <em>P</em> < .05). Plasmin generation was significantly decreased both in plasma clots and standardized fibrin clots from Jak2<sup>V617F</sup> mice compared with Jak2<sup>WT</sup> mice. Among MPN patients, impaired tPA-related fibrinolysis with prolonged clot lysis time was observed in <em>JAK2</em>V617F and <em>CALR</em> patients. Plasminogen activator inhibitor-1 and α2-antiplasmin were significantly increased in plasma from <em>JAK2</em>V617F patients compared with controls.</div></div><div><h3>Conclusion</h3><div>Our results suggest that impaired tPA-mediated fibrinolysis represents an important prothrombotic mechanism in MPN patients that requires confirmation in larger studies.</div></div>","PeriodicalId":17326,"journal":{"name":"Journal of Thrombosis and Haemostasis","volume":null,"pages":null},"PeriodicalIF":5.5000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Thrombosis and Haemostasis","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1538783624004872","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"HEMATOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Background
Myeloproliferative neoplasms (MPNs) are characterized by a high rate of thrombotic complications that contribute to morbidity and mortality. MPN-related thrombogenesis is assumed to be multifactorial, involving both procoagulant and proinflammatory processes. Whether impaired fibrinolysis also participates in the prothrombotic phenotype of MPN has been poorly investigated.
Objectives
We determined whether MPN, particularly JAK2V617F-positive MPN, is associated with fibrinolytic changes.
Methods
Tissue-type plasminogen activator (tPA)–mediated fibrinolysis was evaluated both in whole blood and plasma from mice with a hematopoietic-restricted Jak2V617F expression compared with wild-type (WT) mice (Jak2WT) using (1) halo clot lysis, (2) front lysis, and (3) plasmin generation assays. tPA clot lysis assay was performed in the plasma from 65 MPN patients (JAK2V617F mutation, n = 50; CALR mutations, n = 9) compared with 28 healthy controls.
Results
In whole blood from Jak2V617F mice, we observed a decreased fibrinolysis characterized by a significantly lower halo clot lysis rate compared with Jak2WT (95 ± 22 vs 147 ± 39 AU/min; P < .05). Similar results were observed in plasma (halo clot lysis rate, 130 ± 27 vs 186 ± 29 AU/min; front lysis rate, 2.8 ± 1.6 vs 6.1 ± 1.2 μm.min−1; P < .05). Plasmin generation was significantly decreased both in plasma clots and standardized fibrin clots from Jak2V617F mice compared with Jak2WT mice. Among MPN patients, impaired tPA-related fibrinolysis with prolonged clot lysis time was observed in JAK2V617F and CALR patients. Plasminogen activator inhibitor-1 and α2-antiplasmin were significantly increased in plasma from JAK2V617F patients compared with controls.
Conclusion
Our results suggest that impaired tPA-mediated fibrinolysis represents an important prothrombotic mechanism in MPN patients that requires confirmation in larger studies.
期刊介绍:
The Journal of Thrombosis and Haemostasis (JTH) serves as the official journal of the International Society on Thrombosis and Haemostasis. It is dedicated to advancing science related to thrombosis, bleeding disorders, and vascular biology through the dissemination and exchange of information and ideas within the global research community.
Types of Publications:
The journal publishes a variety of content, including:
Original research reports
State-of-the-art reviews
Brief reports
Case reports
Invited commentaries on publications in the Journal
Forum articles
Correspondence
Announcements
Scope of Contributions:
Editors invite contributions from both fundamental and clinical domains. These include:
Basic manuscripts on blood coagulation and fibrinolysis
Studies on proteins and reactions related to thrombosis and haemostasis
Research on blood platelets and their interactions with other biological systems, such as the vessel wall, blood cells, and invading organisms
Clinical manuscripts covering various topics including venous thrombosis, arterial disease, hemophilia, bleeding disorders, and platelet diseases
Clinical manuscripts may encompass etiology, diagnostics, prognosis, prevention, and treatment strategies.