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Tarandovskiy ID, Buehler PW, Karnaukhova E. Sex-dependent balance between thrombin and plasmin generation in the presence of thrombomodulin. J Thromb Thrombolysis 2022; 55:566-570. [PMID: 36508084 DOI: 10.1007/s11239-022-02742-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/21/2022] [Indexed: 12/14/2022]
Abstract
BACKGROUND Assessing simultaneous generation of thrombin (TG) and plasmin (PG) is an approach to evaluate the balance between coagulation and fibrinolysis with sensitivity to predict endogenous thrombin and plasmin generation. The addition of thrombomodulin (TM), provides the essential component for thrombin activation of protein C and thrombin-activatable fibrinolysis inhibitor. However, the influence of sex on the balance between TG and PG with and without TM addition has not been investigated to date. OBJECTIVES To investigate the possible sex-based differences in TG and PG in the presence and absence of TM. METHODS Simultaneous TG and PG were measured in plasma samples obtained from 17 males and 17 females upon tissue factor and tissue plasminogen activator addition. Thrombin- and plasmin-specific fluorogenic substrates Z-Gly-Gly-Arg-AMC and Boc-Glu-Lys-Lys-AMC were used in the study. Thrombin and plasmin peak height (TPH and PPH) and production rate (TPR and PPR) values were determined. To evaluate the balance between TG and PG, the ratios between TPH and PPH (TPH/PPH) and TPR and PPR (TPR/PPR) were calculated. RESULTS AND CONCLUSIONS TPH between males and females demonstrated significant difference regardless of TM addition. TPR demonstrated differences between males and females only upon TM addition, while PG parameters was not dependent on the sex of the donor. TM significantly lowered TPH/PPH in males, and enhanced TPR/PPR in females. Thus, TPH/PPH and TPR/PPR significantly differed between men and women. Our results indicate that TM may act differently in males and females by shifting the underlying TG/PG balance to fibrinolysis in males and to coagulation in females.
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Affiliation(s)
- Ivan D Tarandovskiy
- Hemostasis Branch, Center for Biologics Evaluation and Research, Food and Drug Administration, 10903 New Hampshire Avenue, 20993, Silver Spring, MD, USA.
| | - Paul W Buehler
- Department of Pathology, The Center for Blood Oxygen Transport and Hemostasis, Department of Pediatrics, University of Maryland, Baltimore, MD, USA
| | - Elena Karnaukhova
- Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, USA
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Ramberg C, Hindberg K, Biedermann JS, Cannegieter SC, van der Meer FJ, Snir O, Leebeek FWG, Kruip MJHA, Hansen JB, Lijfering WM. Rosuvastatin treatment decreases plasma procoagulant phospholipid activity after a VTE: A randomized controlled trial. J Thromb Haemost 2022; 20:877-887. [PMID: 34953155 DOI: 10.1111/jth.15626] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 12/21/2021] [Accepted: 12/22/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND Venous thromboembolism (VTE) is a frequent cardiovascular disease with severe complications, including recurrence and death. There is a great need for alternative prophylactic treatment options as anticoagulation is accompanied by increased bleeding risk. Statins are reported to reduce the risk of incident and recurrent VTE, but the mechanisms are elusive. Procoagulant phospholipids (PPL), and phosphatidylserine in particular, are crucial for efficient coagulation activation, but no studies have investigated the effect of statin treatment on plasma PPL activity. OBJECTIVES To investigate the impact of rosuvastatin treatment on plasma PPL activity and levels of extracellular vesicles (EVs). PATIENTS/METHODS Patients with a history of VTE (≥18 years) allowed to stop anticoagulant treatment were randomized to either 20 mg/day of rosuvastatin treatment or no treatment for 28 days in the Statins Reduce Thrombophilia (NCT01613794) trial. Plasma samples were collected at baseline and study end. PPL activity was measured in samples from 245 participants using a factor Xa-dependent clotting assay and EV levels by flow cytometry. RESULTS Rosuvastatin treatment yielded an overall 22% (95% confidence interval [CI] -38.2 to -5.8) reduction in PPL activity, and 37% (95% CI -62.9 to -11.2) reduction in PPL activity in participants with a history of pulmonary embolism. The effect of rosuvastatin on plasma PPL activity was not explained by changes in total cholesterol nor change in levels of total- or platelet-derived EVs. CONCLUSIONS Rosuvastatin treatment caused a substantial decrease in plasma PPL activity, suggesting that a PPL-dependent attenuation of coagulation activation may contribute to a reduced VTE risk following statin treatment.
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Affiliation(s)
- Cathrine Ramberg
- Department of Clinical Medicine, Thrombosis Research Center (TREC), UiT-The Arctic University of Norway, Tromsø, Norway
| | - Kristian Hindberg
- Department of Clinical Medicine, Thrombosis Research Center (TREC), UiT-The Arctic University of Norway, Tromsø, Norway
| | - Joseph S Biedermann
- Department of Hematology, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands
- Star-shl Anticoagulation Clinic, Rotterdam, The Netherlands
| | - Suzanne C Cannegieter
- Department of Thrombosis and Haemostasis, Leiden University Medical Center, Leiden, the Netherlands
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Felix J van der Meer
- Department of Thrombosis and Haemostasis, Leiden University Medical Center, Leiden, the Netherlands
| | - Omri Snir
- Department of Clinical Medicine, Thrombosis Research Center (TREC), UiT-The Arctic University of Norway, Tromsø, Norway
| | - Frank W G Leebeek
- Department of Hematology, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Marieke J H A Kruip
- Department of Hematology, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands
- Star-shl Anticoagulation Clinic, Rotterdam, The Netherlands
| | - John-Bjarne Hansen
- Department of Clinical Medicine, Thrombosis Research Center (TREC), UiT-The Arctic University of Norway, Tromsø, Norway
- Division of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Willem M Lijfering
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
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Ramberg C, Wilsgård L, Latysheva N, Brækkan SK, Hindberg K, Sovershaev T, Snir O, Hansen J. Plasma procoagulant phospholipid clotting time and venous thromboembolism risk. Res Pract Thromb Haemost 2021; 5:e12640. [PMID: 34977449 PMCID: PMC8686193 DOI: 10.1002/rth2.12640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 10/03/2021] [Accepted: 11/01/2021] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Negatively charged procoagulant phospholipids, phosphatidylserine (PS) in particular, are vital to coagulation and expressed on the surface membrane of extracellular vesicles. No previous study has investigated the association between plasma procoagulant phospholipid clotting time (PPLCT) and future risk of venous thromboembolism (VTE). OBJECTIVES To investigate the association between plasma PPLCT and the risk of incident VTE in a nested case-control study. METHODS We conducted a nested case-control study in 296 VTE patients and 674 age- and sex-matched controls derived from a general population cohort (The Tromsø Study 1994-2007). PPLCT was measured in platelet-free plasma using a modified factor Xa-dependent clotting assay. Logistic regression was used to estimate odds ratio (OR) with 95% confidence intervals (CI) for VTE with PPLCT modelled as a continuous variable across quartiles and in dichotomized analyses. RESULTS There was a weak inverse association between plasma PPLCT and risk of VTE per 1 standard deviation increase of PPLCT (OR 0.93, 95% CI 0.80-1.07) and when comparing those with PPLCT in the highest quartile (OR 0.89, 95% CI 0.60-1.30) with those in the lowest quartile. Subjects with PPLCT >95th percentile had substantially lowered OR for VTE (OR 0.35, 95% CI 0.13-0.81). The inverse association was stronger when the analyses were restricted to samples taken shortly before the event. The risk estimates by categories of plasma PPLCT were similar for deep vein thrombosis and pulmonary embolism. CONCLUSION Our findings suggest that high plasma PPLCT is associated with reduced risk of VTE.
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Affiliation(s)
- Cathrine Ramberg
- Thrombosis Research Centre (TREC)Department of Clinical MedicineUiT ‐ The Arctic University of NorwayTromsøNorway
| | - Line Wilsgård
- Thrombosis Research Centre (TREC)Department of Clinical MedicineUiT ‐ The Arctic University of NorwayTromsøNorway
| | - Nadezhda Latysheva
- Thrombosis Research Centre (TREC)Department of Clinical MedicineUiT ‐ The Arctic University of NorwayTromsøNorway
| | - Sigrid K. Brækkan
- Thrombosis Research Centre (TREC)Department of Clinical MedicineUiT ‐ The Arctic University of NorwayTromsøNorway
- Division of Internal MedicineUniversity Hospital of North NorwayTromsøNorway
| | - Kristian Hindberg
- Thrombosis Research Centre (TREC)Department of Clinical MedicineUiT ‐ The Arctic University of NorwayTromsøNorway
| | - Timofey Sovershaev
- Thrombosis Research Centre (TREC)Department of Clinical MedicineUiT ‐ The Arctic University of NorwayTromsøNorway
| | - Omri Snir
- Thrombosis Research Centre (TREC)Department of Clinical MedicineUiT ‐ The Arctic University of NorwayTromsøNorway
| | - John‐Bjarne Hansen
- Thrombosis Research Centre (TREC)Department of Clinical MedicineUiT ‐ The Arctic University of NorwayTromsøNorway
- Division of Internal MedicineUniversity Hospital of North NorwayTromsøNorway
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Leleu D, Levionnois E, Laurent P, Lazaro E, Richez C, Duffau P, Blanco P, Sisirak V, Contin-Bordes C, Truchetet ME. Elevated Circulatory Levels of Microparticles Are Associated to Lung Fibrosis and Vasculopathy During Systemic Sclerosis. Front Immunol 2020; 11:532177. [PMID: 33193304 PMCID: PMC7645042 DOI: 10.3389/fimmu.2020.532177] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 10/01/2020] [Indexed: 12/25/2022] Open
Abstract
Background Microparticles (MPs) are vesicular structures that derive from multiple cellular sources. MPs play important roles in intercellular communication, regulation of cell signaling or initiation of enzymatic processes. While MPs were characterized in Systemic Sclerosis (SSc) patients, their contribution to SSc pathogenesis remains unknown. Our aim was to investigate the potential role of MPs in SSc pathophysiology and their impact on tissue fibrosis. Methods Ninety-six SSc patients and 37 sex-matched healthy donors (HD) were enrolled in this study in order to quantify and phenotype their plasmatic MPs by flow cytometry. The ability of MPs purified from SSc patients and HD controls to modulate fibroblast's extra-cellular matrix genes expression was evaluated in vitro by reverse transcriptase quantitative polymerase chain reaction. Results SSc patients exhibited a higher concentration of circulatory MPs compared to HD. This difference was exacerbated when we only considered patients that were not treated with methotrexate or targeted disease-modifying antirheumatic drugs. Total circulatory MPs were associated to interstitial lung disease, lung fibrosis and diminished lung functional capacity, but also to vascular involvement such as active digital ulcers. Finally, contrary to HD MPs, MPs from SSc patients stimulated the production of extracellular matrix by fibroblast, demonstrating their profibrotic potential. Conclusions In this study, we provide evidence for a direct profibrotic role of MPs from SSc patients, underpinned by strong clinical associations in a large cohort of patients.
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Affiliation(s)
- Damien Leleu
- University of Bordeaux, CNRS, ImmunoConcEpT, UMR 5164, Bordeaux, France
- Immunology and Immunogenetic Department, Bordeaux University Hospital, Bordeaux, France
| | | | - Paoline Laurent
- University of Bordeaux, CNRS, ImmunoConcEpT, UMR 5164, Bordeaux, France
| | - Estibaliz Lazaro
- University of Bordeaux, CNRS, ImmunoConcEpT, UMR 5164, Bordeaux, France
- Internal Medicine Department, Bordeaux University Hospital, Bordeaux, France
- Centre national de reference des maladies auto-immunes systémiques rares de l’Est et du Sud-Ouest (RESO), Bordeaux, France
| | - Christophe Richez
- University of Bordeaux, CNRS, ImmunoConcEpT, UMR 5164, Bordeaux, France
- Centre national de reference des maladies auto-immunes systémiques rares de l’Est et du Sud-Ouest (RESO), Bordeaux, France
- Rheumatology Department, Bordeaux University Hospital, Bordeaux, France
| | - Pierre Duffau
- University of Bordeaux, CNRS, ImmunoConcEpT, UMR 5164, Bordeaux, France
- Internal Medicine Department, Bordeaux University Hospital, Bordeaux, France
| | - Patrick Blanco
- University of Bordeaux, CNRS, ImmunoConcEpT, UMR 5164, Bordeaux, France
- Immunology and Immunogenetic Department, Bordeaux University Hospital, Bordeaux, France
| | - Vanja Sisirak
- University of Bordeaux, CNRS, ImmunoConcEpT, UMR 5164, Bordeaux, France
| | - Cecile Contin-Bordes
- University of Bordeaux, CNRS, ImmunoConcEpT, UMR 5164, Bordeaux, France
- Immunology and Immunogenetic Department, Bordeaux University Hospital, Bordeaux, France
| | - Marie-Elise Truchetet
- University of Bordeaux, CNRS, ImmunoConcEpT, UMR 5164, Bordeaux, France
- Centre national de reference des maladies auto-immunes systémiques rares de l’Est et du Sud-Ouest (RESO), Bordeaux, France
- Rheumatology Department, Bordeaux University Hospital, Bordeaux, France
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Koltsova EM, Kuprash AD, Dashkevich NM, Vardanyan DM, Chernyakov AV, Kumskova MA, Nair SC, Srivastava A, Ataullakhanov FI, Panteleev MA, Balandina AN. Determination of fibrin clot growth and spatial thrombin propagation in the presence of different types of phospholipid surfaces. Platelets 2020; 32:1031-1037. [PMID: 32967497 DOI: 10.1080/09537104.2020.1823360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
In this work, we present a new method-Thrombodynamics-4D-for the assessment of both plasma and platelet contributions to clotting. Thrombodynamics-4D potentially allows for the determination of plasma or platelet disorders and the effects of various drugs on plasma clotting or on platelet procoagulant function. In this assay, clot formation in platelet-rich plasma or platelet-free plasma supplemented with phospholipids is activated with tissue factor immobilized on a surface. Spatial fibrin clot growth and thrombin concentration dynamics are registered by measuring light scattering of the fibrin clot and fluorescence of the product formed by cleavage of the synthetic fluorogenic substrate by thrombin, respectively. Here, we describe the preanalytical requirements, measurement methodology and calculation principles of assay parameters. Preanalytical and analytical variability and reference ranges of the assay are given. Additionally, we show some clinical examples, which determine the effect of anticoagulants, measure clotting dysfunction in patients with platelet or coagulation disorders and evaluate the effect of surgery.
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Affiliation(s)
- Ekaterina M Koltsova
- Department of Biophysics and System Biology, National Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia.,Center for Theoretical Problems of Physicochemical Pharmacology RAS, Moscow, Russia
| | - Anna D Kuprash
- Department of Biophysics and System Biology, National Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia.,Center for Theoretical Problems of Physicochemical Pharmacology RAS, Moscow, Russia
| | - Natalya M Dashkevich
- Department of Biophysics and System Biology, National Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia.,Center for Theoretical Problems of Physicochemical Pharmacology RAS, Moscow, Russia
| | | | | | - Maria A Kumskova
- Department of Biophysics and System Biology, National Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia
| | - Sukesh C Nair
- Department of Haematology, Christian Medical College, Vellore, India
| | - Alok Srivastava
- Department of Haematology, Christian Medical College, Vellore, India
| | - Fazoil I Ataullakhanov
- Department of Biophysics and System Biology, National Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia.,Center for Theoretical Problems of Physicochemical Pharmacology RAS, Moscow, Russia
| | - Mikhail A Panteleev
- Department of Biophysics and System Biology, National Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia.,Center for Theoretical Problems of Physicochemical Pharmacology RAS, Moscow, Russia
| | - Anna N Balandina
- Department of Biophysics and System Biology, National Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia.,Center for Theoretical Problems of Physicochemical Pharmacology RAS, Moscow, Russia
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6
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Bouchard BA, Orfeo T, Keith HN, Lavoie EM, Gissel M, Fung M, Mann KG. Microparticles formed during storage of red blood cell units support thrombin generation. J Trauma Acute Care Surg 2019; 84:598-605. [PMID: 29251713 DOI: 10.1097/ta.0000000000001759] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Intact red blood cells (RBCs) appear to support thrombin generation in in vitro models of blood coagulation. During storage of RBC units, biochemical, structural, and physiological changes occur including alterations to RBC membranes and release of microparticles, which are collectively known as storage lesion. The clinical consequences of microparticle formation in RBC units are unclear. This study was performed to assess thrombin generation via the prothrombinase complex by washed RBCs and RBC-derived microparticles as a function of RBC unit age. METHODS Well-characterized kinetic and flow cytometric assays were used to quantify and characterize microparticles isolated from leukocyte-reduced RBC units during storage for 42 days under standard blood banking conditions. RESULTS Stored RBCs exhibited known features of storage lesion including decreasing pH, cell lysis, and release of microparticles demonstrated by scanning electron microscopy. The rate of thrombin formation by RBC units linearly increased during storage, with the microparticle fraction accounting for approximately 70% of the prothrombinase activity after 35 days. High-resolution flow cytometric analyses of microparticle isolates identified phosphatidylserine-positive RBC-derived microparticles; however, their numbers over time did not correlate with thrombin formation in that fraction. CONCLUSION Red blood cell-derived microparticles capable of supporting prothrombinase function accumulate during storage, suggesting an increased potential of transfused units as they age to interact in unplanned ways with ongoing hemostatic processes in injured individuals, especially given the standard blood bank practice of using the oldest units available.
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Affiliation(s)
- Beth A Bouchard
- From the Department of Biochemistry (B.A.B., T.O., H.N.K., E.M.L., M.G., K.G.M.), and Blood Bank and Transfusion Medicine, Department of Pathology (M.F.), The Larner College of Medicine at the University of Vermont, Burlington, Vermont
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7
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Høiland II, Liang RA, Hindberg K, Latysheva N, Brekke OL, Mollnes TE, Hansen JB. Associations between complement pathways activity, mannose-binding lectin, and odds of unprovoked venous thromboembolism. Thromb Res 2018; 169:50-56. [DOI: 10.1016/j.thromres.2018.06.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 06/08/2018] [Accepted: 06/26/2018] [Indexed: 01/10/2023]
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9
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Abstract
SummaryBackground: Age is an important and independent risk factor for venous thromboembolism (VTE) and pulmonary embolism (PE). The objectives of this study were to investigate the effects of aging process on PE with regard to the severity of PE, symptoms, inhospital death, history of PE, ECG, echocardiographic, and laboratory findings.Methods: 182 patients with confirmed PE were reviewed retrospectively and subdivided into 4 age groups (<60, 60–69, 70–79 and ≥ 80 years). Analysis of patients’ symptoms, history, echocardiographic, electrocardiographic and laboratory parameters was performed.Results: Proportion of women increased with age (<60 years: 41.5 % vs. 80+ years: 73.1 %, P<0.05). Also percentage of right ventricular dysfunction (RVD) was highest in eldest age group (60–69 years: 42.4 % vs. 80+ years: 75 %, P<0.05). Systolic pulmonary artery pressure (sPAP) was significantly higher in the 80+ years age group. The sPAP was constant from the <60 years group (29.0 ± 17.4 mmHg) to the 60–69 years group (27.4 ± 19.3 mmHg), and increased from the 60–69 years and 70–79 years group (33.8 ± 17.5 mmHg) to the 80+ years groups (44.3 ± 14.3 mmHg) (<60 vs. 80+ and 60–69 vs. 80+ years: respectively P<0.001 and 70–79 vs. 80+ years: P<0.05).Regression model for PE patients 80years showed an association between age 80+ and female gender (OR, 2.53; 95%CI: 1.07–5.99, p<0.05), right bundle branch block (OR, 3.07; 95%CI: 1.05–9.02, p<0.05), RVD (OR, 2.53; 95%CI: 1.07–6.00, p<0.05) and sPAP (OR, 1.05; 95%CI: 1.02–1.08, p<0.001). Pearson correlation matrix revealed a significant correlation between age and sPAP (r=0.30, P<0.001).Conclusions: Right ventricular load at acute PE event, evident from RVD and elevated sPAP, increases with age. RVD is connected with higher mortality in PE patients. High sPAP at acute PE event is one of the well-known risk factors for the development of chronic thromboembolic pulmonary hypertension in long-term. Proportion of female PE patients increases with age.
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Park MS, Spears GM, Bailey KR, Xue A, Ferrara MJ, Headlee A, Dhillon SK, Jenkins DH, Zietlow SP, Harmsen WS, Ashrani AA, Heit JA. Thrombin generation profiles as predictors of symptomatic venous thromboembolism after trauma: A prospective cohort study. J Trauma Acute Care Surg 2017; 83:381-387. [PMID: 28362683 PMCID: PMC5573638 DOI: 10.1097/ta.0000000000001466] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Reliable biomarkers predictive of venous thromboembolism (VTE) after acute trauma are uncertain. The objective of the study was to identify risk factors for symptomatic VTE after trauma, including individual plasma coagulome characteristics as reflected by thrombin generation. METHODS In a prospective, case-cohort study, trauma patients were enrolled over the 4.5-year period, 2011 to 2015. Blood was collected by venipuncture into 3.2% trisodium citrate at 0, 6, 12, 24, and 72 hours after injury and at hospital discharge. Platelet poor plasma was stored at -80 °C until analysis. Thrombin generation, as determined by the calibrated automated thrombogram (CAT) using 5 pM tissue factor (TF)/4 μM phospholipid (PS), was reported as peak height (nM thrombin) and time to peak height (ttPeak [minutes]). Data are presented as median [IQR] or hazard ratio with 95% CI. RESULTS Among 453 trauma patients (injury severity score = 13.0 [6.0, 22.0], hospital length of stay = 4.0 [2.0, 10.0] days, age = 49 [28, 64] years, 71% male, 96% with blunt mechanism, mortality 3.2%), 83 developed symptomatic VTE within 92 days after injury (35 [42%] after hospital discharge). In a weighted, multivariate Cox model that included clinical and CAT characteristics available within 24 hours of admission, increased patient age (1.35 [1.19,1.52] per 10 years, p < 0.0001), body mass index ≥30 kg/m (4.45 [2.13,9.31], p < 0.0001), any surgery requiring general anesthesia (2.53 [1.53,4.19], p = 0.0003) and first available ttPeak (1.67 [1.29, 2.15], p < 0.00001) were independent predictors of incident symptomatic VTE within 92 days after trauma (C-statistic = 0.799). CONCLUSION The individual's plasma coagulome (as reflected by thrombin generation) is an independent predictor of VTE after trauma. Clinical characteristics and ttPeak can be used to stratify acute trauma patients into high and low risk for VTE. LEVEL OF EVIDENCE Prognostic, level III.
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Affiliation(s)
- Myung S. Park
- Department of Trauma and Critical Care Surgery, Mayo Clinic,
Rochester, Minnesota
| | - Grant M. Spears
- Department of Health Sciences Research, Mayo Clinic, Rochester,
Minnesota
| | - Kent R. Bailey
- Department of Health Sciences Research, Mayo Clinic, Rochester,
Minnesota
| | - Ailing Xue
- Hematology Research, Mayo Clinic, Rochester, Minnesota
| | | | - Amy Headlee
- Department of Surgery, Mayo Clinic, Rochester, Minnesota
| | | | - Donald H. Jenkins
- Department of Trauma and Critical Care Surgery, Mayo Clinic,
Rochester, Minnesota
| | - Scott P. Zietlow
- Department of Trauma and Critical Care Surgery, Mayo Clinic,
Rochester, Minnesota
| | - William S. Harmsen
- Department of Health Sciences Research, Mayo Clinic, Rochester,
Minnesota
| | - Aneel A. Ashrani
- Department of Health Sciences Research, Mayo Clinic, Rochester,
Minnesota
- Hematology Research, Mayo Clinic, Rochester, Minnesota
- Department of Internal Medicine, Mayo Clinic, Rochester,
Minnesota
| | - John A. Heit
- Department of Health Sciences Research, Mayo Clinic, Rochester,
Minnesota
- Hematology Research, Mayo Clinic, Rochester, Minnesota
- Department of Internal Medicine, Mayo Clinic, Rochester,
Minnesota
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Enjeti AK, Ariyarajah A, D'Crus A, Seldon M, Lincz LF. Circulating microvesicle number, function and small RNA content vary with age, gender, smoking status, lipid and hormone profiles. Thromb Res 2017; 156:65-72. [DOI: 10.1016/j.thromres.2017.04.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 03/23/2017] [Accepted: 04/18/2017] [Indexed: 10/19/2022]
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Campello E, Radu CM, Spiezia L, Simioni P. Modulating thrombotic diathesis in hereditary thrombophilia and antiphospholipid antibody syndrome: a role for circulating microparticles? Clin Chem Lab Med 2017; 55:934-943. [PMID: 27816948 DOI: 10.1515/cclm-2016-0562] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Accepted: 09/19/2016] [Indexed: 01/09/2023]
Abstract
Over the past decades, there have been great advances in the understanding of the pathogenesis of venous thromboembolism (VTE) in patients with inherited and acquired thrombophilia [mainly antiphospholipid antibody syndrome (APS)]. However, a number of questions remain unanswered. Prognostic markers capable of estimating the individual VTE risk would be of great use. Microparticles (MPs) are sub-micron membrane vesicles constitutively released from the surface of cells after cellular activation and apoptosis. The effects of MPs on thrombogenesis include the exposure of phopshatidylserine and the expression of tissue factor and MPs have been described in clinical studies as possible diagnostic and prognostic biomarkers for VTE. This review will provide a novel perspective on the current knowledge and research trends on the possible role of MPs in hereditary thrombophilia and APS. Basically, the published data show that circulating MPs may contribute to the development of VTE in thrombophilic carriers, both in mild and severe states. Moreover, the presence of endothelial-MPs and platelet-MPs has been described in antiphospholipid syndrome and seems to be directly linked to antiphospholipid antibodies and not to other underlying autoimmune disorders or the thrombotic event itself. In conclusion, circulating MPs may constitute an epiphenomenon of thrombophilia itself and could be up-regulated in acute particular conditions, promoting a global prothrombotic state up to the threshold of the clinical relevant thrombotic event.
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13
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Ridger VC, Boulanger CM, Angelillo-Scherrer A, Badimon L, Blanc-Brude O, Bochaton-Piallat ML, Boilard E, Buzas EI, Caporali A, Dignat-George F, Evans PC, Lacroix R, Lutgens E, Ketelhuth DFJ, Nieuwland R, Toti F, Tunon J, Weber C, Hoefer IE. Microvesicles in vascular homeostasis and diseases. Position Paper of the European Society of Cardiology (ESC) Working Group on Atherosclerosis and Vascular Biology. Thromb Haemost 2017; 117:1296-1316. [PMID: 28569921 DOI: 10.1160/th16-12-0943] [Citation(s) in RCA: 167] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 04/27/2017] [Indexed: 12/15/2022]
Abstract
Microvesicles are members of the family of extracellular vesicles shed from the plasma membrane of activated or apoptotic cells. Microvesicles were initially characterised by their pro-coagulant activity and described as "microparticles". There is mounting evidence revealing a role for microvesicles in intercellular communication, with particular relevance to hemostasis and vascular biology. Coupled with this, the potential of microvesicles as meaningful biomarkers is under intense investigation. This Position Paper will summarise the current knowledge on the mechanisms of formation and composition of microvesicles of endothelial, platelet, red blood cell and leukocyte origin. This paper will also review and discuss the different methods used for their analysis and quantification, will underline the potential biological roles of these vesicles with respect to vascular homeostasis and thrombosis and define important themes for future research.
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Affiliation(s)
| | - Chantal M Boulanger
- Victoria Ridger, PhD, Department of Infection, Immunity and Cardiovascular Disease, Faculty of Medicine, Dentistry and Health, University of Sheffield, Sheffield, UK, E-mail: , or, Chantal M. Boulanger, PhD, INSERM UMR-S 970, Paris Cardiovascular Research Center - PARCC, 56 rue Leblanc, 75015 Paris, France, E-mail:
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14
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Combat Venous Thromboembolism. CURRENT PULMONOLOGY REPORTS 2017. [DOI: 10.1007/s13665-017-0173-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Amiral J, Seghatchian J. Measurement of extracellular vesicles as biomarkers of consequences or cause complications of pathological states, and prognosis of both evolution and therapeutic safety/efficacy. Transfus Apher Sci 2016; 55:23-34. [PMID: 27475803 DOI: 10.1016/j.transci.2016.07.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Utility of EVs, as biomarkers of cause or consequence of various pathological complications, and prognosis of blood components' therapy in terms of safety/efficacy and their potential associated hazards, primed by EVs involvements in pro-inflammatory, immunomodulatory and activations of both pro/anti-coagulatory and others associated pathways, as well as various cellular cross talks, are highlighted as the fundamental. Today EVs are becoming the "buzz" words of the current diagnosis, development and research [DDR] strategies, with the aim of ensuring safer therapeutic approaches in the current clinical practices, also incorporating their potential in long term cost effectiveness in health care systems. The main focus of this manuscript is to review the current opinions in some fundamental areas of EVs involvements in health and diseases. Firstly, our goal is highlighting what are EVs/MVs/MPs and how are they generated in physiology, pathology or blood products; classification and significance of EVs generated in vivo; followed by consequences and physiological/pathological induced effects of EVs generation in vivo. Secondly, specific cell origin EVs and association with malignancy; focus on EVs carrying TF and annexin V as a protective protein for harmful effects of EVs, and associations with LA; and incidence of anti-annexin V antibodies are also discussed. Thirdly, utility of EVs is presented: as diagnostic tools of disease markers; prognosis and follow-up of clinical states; evaluation of therapy efficacy; quality and risk assessment of blood products; followed by the laboratory tools for exploring, characterizing and measuring EVs, and/or their associated activity, using our own experiences of capture based assays. Finally, in perspective, the upcoming low volume sampling, fast, reliable and reproducibility and friendly use laboratory tools and the standardization of measurement methods are highlighted with the beneficial effects that we are witnessing in both wound healing and tissue remodeling, with an expected blockbuster status EVs as future therapeutic directions.
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Affiliation(s)
- Jean Amiral
- Hyphen BioMed, Neuville sur Oise, Paris, France.
| | - Jerard Seghatchian
- International Consultancy in Blood Components Quality/Safety Improvement, Audit/Inspection and DDR Strategies, London, UK
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Ivak P, Pitha J, Netuka I. Circulating microparticles as a predictor of vascular properties in patients on mechanical circulatory support; hype or hope? Physiol Res 2016; 65:727-735. [PMID: 27429109 DOI: 10.33549/physiolres.933246] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Microparticles are small circulating vesicles originating from circulatory system and vascular wall cells released during their activation or damage. They possess different roles in regulation of endothelial function, inflammation, thrombosis, angiogenesis, and in general, cellular stress. Microparticles are the subject of intensive research in pulmonary hypertension, atherosclerotic disease, and heart failure. Another recently emerging role is the evaluation of the status of vasculature in end-stage heart failure patients treated with implantable ventricular assist devices. In patients implanted as destination therapy, assessment of the long-term effect of currently used continuous-flow left ventricular assist devices (LVADs) on vasculature might be of critical importance. However, unique continuous flow pattern generated by LVADs makes it difficult to assess reliably the vascular function with most currently used methods, based mainly on ultrasound detection of changes of arterial dilatation during pulsatile flow. In this respect, the measurement of circulating microparticles as a marker of vascular status may help to elucidate both short- and long-term effects of LVADs on the vascular system. Because data regarding this topic are very limited, this review is focused on the advantages and caveats of the circulating microparticles as markers of vascular function in patients on continuous-flow LVADs.
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Affiliation(s)
- P Ivak
- Institute for Clinical and Experimental Medicine, Prague, Czech Republic.
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Campello E, Spiezia L, Radu CM, Simioni P. Microparticles as biomarkers of venous thromboembolic events. Biomark Med 2016; 10:743-55. [DOI: 10.2217/bmm-2015-0063] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Microparticles (MPs) are small (0.1–1.0 μm) membrane vesicles constitutively released from the surface of cells after activation and apoptosis. The clinical research on MPs is hampered by the limitations of the currently available detection methods. A correlation between MPs and venous thromboembolism (VTE) has been observed. The effects of MPs on thrombogenesis involve the exposure of phosphatidylserine, the vehiculation of tissue factor, and MP-induced intercellular cross-talk between inflammation and coagulation. This review will focus on the potential role of plasma MPs as biomarkers in detecting acute unprovoked VTE, predicting VTE occurrence in high-risk situations (mainly cancer), and ultimately, we will discuss currently available studies on the prognostic role of MPs to guide primary and secondary VTE prevention protocols.
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Affiliation(s)
- Elena Campello
- Department of Medicine (DIMED), University of Padua, Padua, Italy
| | - Luca Spiezia
- Department of Medicine (DIMED), University of Padua, Padua, Italy
| | - Claudia M Radu
- Department of Medicine (DIMED), University of Padua, Padua, Italy
| | - Paolo Simioni
- Department of Medicine (DIMED), University of Padua, Padua, Italy
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Abstract
Orthopedic trauma results in systemic physiologic changes that predispose patients to venous thromboembolism (VTE). In the absence of prophylaxis, VTE incidence may be as high as 60%. Mechanical and pharmacologic thromboprophylaxis are effective in decreasing rates of VTE. Combined mechanical and pharmacologic thromboprophylaxis is more efficacious for decreasing VTE incidence than either regimen independently. If pharmacologic thromboprophylaxis is contraindicated, mechanical prophylaxis should be used. Patients with isolated lower extremity fractures who are ambulatory, or those with isolated upper extremity trauma, do not require pharmacologic prophylaxis in the absence of other VTE risk factors.
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Affiliation(s)
- Paul S Whiting
- Department of Orthopaedics and Rehabilitation, University of Wisconsin, 1685 Highland Avenue, Madison, WI 53705, USA
| | - A Alex Jahangir
- Department of Orthopaedics and Rehabilitation, Vanderbilt University Medical Center, 1215 21st Avenue South, MCE South Tower, Suite 4200, Nashville, TN 37232, USA.
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Xu MD, Wu XZ, Zhou Y, Xue Y, Zhang KQ. Proteomic characteristics of circulating microparticles in patients with newly-diagnosed type 2 diabetes. Am J Transl Res 2016; 8:209-220. [PMID: 27069554 PMCID: PMC4759430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Accepted: 11/27/2015] [Indexed: 06/05/2023]
Abstract
OBJECTIVE This study aimed to evaluate the proteomic characteristics of plasma microparticles (MPs) from patients with newly diagnosed type 2 diabetes (T2DM). METHODS The subjects comprised eight male T2DM patients recruited between December 2013 and March 2014, as well as eight age and sex-matched healthy controls enrolled during the same period. Plasma microparticles (MPs) were extracted from the blood of each subject, and subjected to proteomics analysis using label-free methods. Bioinformatic analyses were performed using specialized software. RESULTS 3,148 unique peptides and 496 proteins were identified, among these, 46 proteins were differentially expressed between the two groups. Among these 46 candidates, 20 proteins had higher expression in T2DM group compared with the control group, whereas 3 proteins displayed lower expression. There were 17 proteins only detected in T2DM group, and 6 proteins only detected in the control group. Gene ontology (GO) analysis revealed significant differences between the two groups in some functional nodes, including neutrophil accumulation, chemokine production, platelet activation, and blood coagulation. Pathway analysis showed that proteins involved in platelet activation, cell adhesion, focal adhesion, and extracellular matrix-receptor interaction were differentially expressed between the 2 groups. Network analysis indicated that ubiquitin was the protein with the highest degree of connectivity. CONCLUSIONS Blood MPs from T2DM patients are enriched in proteins involved in platelet activation, cell adhesion, and inflammation. Therefore, MPs in T2DM patients might be associated with hypercoagulable state in diabetic patients and the development of diabetic complications.
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Affiliation(s)
- Min-Dan Xu
- Department of Endocrinology and Metabolism, Shanghai Tongji Hospital, Tongji University School of MedicineShanghai, China
| | - Xian-Zheng Wu
- Department of Emergency, Shanghai Tongji Hospital, Tongji University School of MedicineShanghai, China
| | - Yun Zhou
- Department of Endocrinology and Metabolism, Shanghai Tongji Hospital, Tongji University School of MedicineShanghai, China
| | - Ying Xue
- Department of Endocrinology and Metabolism, Shanghai Tongji Hospital, Tongji University School of MedicineShanghai, China
| | - Ke-Qin Zhang
- Department of Endocrinology and Metabolism, Shanghai Tongji Hospital, Tongji University School of MedicineShanghai, China
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Park MS, Xue A, Spears GM, Halling TM, Ferrara MJ, Kuntz MM, Dhillon SK, Jenkins DH, Harmsen WS, Ballman KV, Heit JA. Thrombin generation and procoagulant microparticle profiles after acute trauma: A prospective cohort study. J Trauma Acute Care Surg 2015; 79:726-31. [PMID: 26496097 PMCID: PMC4621757 DOI: 10.1097/ta.0000000000000839] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The two sides of trauma-induced coagulopathy, the hypocoagulable and the hypercoagulable states, are poorly understood. To identify potential mechanisms for venous thromboembolism and bleeding after acute trauma, we estimated changes in circulating procoagulant microparticles (MPs) and thrombin activity during hospitalization for trauma. METHODS Whole blood was collected by venipuncture into 3.2% trisodium citrate at 0, 6, 12, 24, and 72 hours after injury and discharge. Platelet-poor plasma was harvested and stored at -80°C until analysis. Thrombin generation was determined using the calibrated automated thrombogram (CAT), reported as lag time (minutes), peak height (nM thrombin), and time to reach peak height (ttPeak, minutes). The concentration of total procoagulant MPs (number/μL) was measured by flow cytometry. Data are presented as median (interquartile range [IQR]). RESULTS Among 443 trauma patients (1,734 samples; Injury Severity Score [ISS], 13.0 [IQR, 6.0-22.0]; hospital length of stay, 4.0 days [IQR, 2.0-10.0]; age, 48 years [IQR, 28-65]; 70.7% male; 95% with blunt mechanism; mortality, 3.2%), no discernable patterns in thrombin generation or MP concentration were observed over time. The peak height and MPs were significantly different from healthy volunteers and were 337 nM (IQR, 285-395) and 400/μL plasma (IQR, 211-772), respectively. Extreme (defined as highest or lowest 5%) values reflecting a possible "hypercoagulable state" (lag time ≤ 1.98, peak height ≥ 486.2, ttPeak ≤ 3.61, and total procoagulant MP ≥ 2,278) were reached within 12 hours after acute trauma, while extreme values representing a possible "hypocoagulable state" (lag time ≥ 18.6, peak height ≤ 17.8, and ttPeak ≥ 29.45) were not reached until 1 day to 3 days. CONCLUSION Although there was no predictable pattern of coagulopathy observed in each patient after trauma, those who reached extreme values did so relatively early after injury. These findings should be taken into account when designing risk model tools involving coagulation laboratory parameters. LEVEL OF EVIDENCE Epidemiologic study, level III.
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Affiliation(s)
- Myung S. Park
- Department of Trauma and Critical Care Surgery, Mayo Clinic, Rochester, Minnesota
| | - Ailing Xue
- Hematology Research, Mayo Clinic, Rochester, Minnesota
| | - Grant M. Spears
- Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota
| | | | | | | | | | - Donald H. Jenkins
- Department of Trauma and Critical Care Surgery, Mayo Clinic, Rochester, Minnesota
| | - William S. Harmsen
- Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota
| | - Karla V. Ballman
- Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota
| | | | - John A. Heit
- Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
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The diagnostic usefulness of capture assays for measuring global/specific extracellular micro-particles in plasma. Transfus Apher Sci 2015; 53:127-36. [PMID: 26572801 DOI: 10.1016/j.transci.2015.10.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Capture assays were developed and validated for measuring the global pro-coagulant activity of micro-particles (MPs, mainly originated from platelets), or specific extravascular cellular MPs (released from erythrocytes, leukocytes, monocytes, endothelial cells) as those exposing TF (MP-TF, mainly observed in patients with some cancers). Conversely to Flow Cytometry methods, these capture assays measure all coagulant activity associated with MPs, through thrombin generation (MP-Activity) or Factor Xa generation (MP-TF), and therefore they bring a complementary information, as they are more specific for the pro-coagulant activity associated with MPs. Small particles (<0.40 µ) exposing Phosphatidyl Serine (PS) exhibit a greater pro-coagulant surface than larger MPs (0.40 to >1.00 µ), those preferentially measured with flow cytometry. Activity associated with MPs is a consequence of disease but can also be a cause contributing to pathological processes and development of thrombo-embolic events. In many diseases, flow cytometry and capture assays do not totally correlate, and have different associations with disease evolution. Optimized capture based assays are presented and discussed, along with their performance characteristics and some applications. They can be performed in any technically skillful hemostasis laboratory, using a thermostated ELISA equipment, or an incubator. Dynamic ranges for MP-Activity assay is from <0.1 nM to >2.5 nM Phospholipids, expressed as Phosphatidyl Serine (PS) equivalent, in the tested dilution. For MP-TF the very sensitive bio-immunoassay reported allows measuring concentrations from <0.10 pg/ml (TF equivalent) to >5.00 pg/ml, in the assayed dilution. No measurable MP-TF was found in normals, although an important concentration was generated from whole blood treated with Lipo-Poly-Saccharides. Capture based assays are then highly useful in the laboratory setting for measuring the activities associated with pro-coagulant, or specific cellular MPs.
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Breen KA, Sanchez K, Kirkman N, Seed PT, Parmar K, Moore GW, Hunt BJ. Endothelial and platelet microparticles in patients with antiphospholipid antibodies. Thromb Res 2014; 135:368-74. [PMID: 25496997 DOI: 10.1016/j.thromres.2014.11.027] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 11/03/2014] [Accepted: 11/30/2014] [Indexed: 01/05/2023]
Abstract
BACKGROUND The antiphospholipid syndrome (APS) is the association of thrombosis and recurrent pregnancy loss and/or pregnancy morbidity with persistent antiphospholipid antibodies (aPL). Previous studies of microparticles in patients with APS/aPL have mainly been small and findings, contradictory. OBJECTIVES To quantify endothelial and platelet microparticle levels in patients with isolated antiphospholipid antibodies or primary antiphospholipid syndrome (PAPS). PATIENTS/METHODS We measured endothelial and platelet microparticle levels by flow cytometry in 66 aPL/PAPS patients and 18 healthy controls. RESULTS Levels of circulating platelet (CD41 and CD61) and endothelial microparticles (CD51 and CD105) were significantly increased in patients with PAPS and aPL compared to healthy controls. There were correlations between platelet and endothelial microparticles levels in all patients with aPL. CONCLUSIONS Platelet and endothelial microparticles are increased in all patient groups within this cohort of patients aPL. Whether they may have a role in the pathogenesis of APS merits further study.
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Affiliation(s)
- K A Breen
- Guys and St.Thomas' NHS Foundation Trust, London, United Kingdom.
| | - K Sanchez
- Viapath, Guys and St.Thomas' NHS Foundation Trust, London, United Kingdom
| | - N Kirkman
- Viapath, Guys and St.Thomas' NHS Foundation Trust, London, United Kingdom
| | - P T Seed
- King's College, London, United Kingdom
| | - K Parmar
- Guys and St.Thomas' NHS Foundation Trust, London, United Kingdom
| | - G W Moore
- Viapath, Guys and St.Thomas' NHS Foundation Trust, London, United Kingdom
| | - B J Hunt
- Guys and St.Thomas' NHS Foundation Trust, London, United Kingdom; King's College, London, United Kingdom
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Ayers L, Harrison P, Kohler M, Ferry B. Procoagulant and platelet-derived microvesicle absolute counts determined by flow cytometry correlates with a measurement of their functional capacity. J Extracell Vesicles 2014; 3:25348. [PMID: 25317277 PMCID: PMC4185095 DOI: 10.3402/jev.v3.25348] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 08/28/2014] [Accepted: 08/30/2014] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Flow cytometry is the most commonly used technology to measure microvesicles (MVs). Despite reported limitations of this technique, MV levels obtained using conventional flow cytometry have yielded many clinically relevant findings, such as associations with disease severity and ability to predict clinical outcomes. This study aims to determine if MV enumeration by flow cytometry correlates with a measurement of their functional capacity, as this may explain how flow cytometry generates clinically relevant results. METHODS ONE HUNDRED SAMPLES FROM HEALTHY INDIVIDUALS AND PATIENTS WITH OBSTRUCTIVE SLEEP APNOEA WERE ANALYSED BY CONVENTIONAL FLOW CYTOMETRY (FACSCALIBUR) AND BY THREE FUNCTIONAL MV ASSAYS: Zymuphen MP-activity in which data were given as phosphatidylserine equivalent, STA(®) Phospholipid Procoag Assay expressed as clotting time and Endogenous Thrombin Potential (ETP) reflecting in vitro thrombin generation. Correlations were determined by Spearman correlation. RESULTS Absolute counts of lactadherin+ procoagulant MVs generated by flow cytometry weakly correlated with the results obtained from the Zymuphen MP-activity (r=0.5370, p<0.0001); correlated with ETP (r=0.7444, p<0.0001); negatively correlated with STA(®) Phospholipid Procoag Assay clotting time (-0.7872, p<0.0001), reflecting a positive correlation between clotting activity and flow cytometry. Levels of Annexin V+ procoagulant and platelet-derived MVs were also associated with functional assays. Absolute counts of MVs derived from other cell types were not correlated with the functional results. CONCLUSIONS Quantitative results of procoagulant and platelet-derived MVs from conventional flow cytometry are associated with the functional capability of the MVs, as defined by three functional MV assays. Flow cytometry is a valuable technique for the quantification of MVs from different cellular origins; however, a combination of several analytical techniques may give the most comprehensive information on the role of MVs in health and disease.
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Affiliation(s)
- Lisa Ayers
- Department of Clinical Immunology, Oxford University Hospitals NHS Trust, Oxford, UK
| | - Paul Harrison
- School of Immunity and Infection, University of Birmingham Medical School, Birmingham, UK
| | - Malcolm Kohler
- Sleep Disorders Centre and Pulmonary Division, University Hospital of Zurich, Zürich, Switzerland
| | - Berne Ferry
- Department of Clinical Immunology, Oxford University Hospitals NHS Trust, Oxford, UK
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Rautou PE, Mackman N. Microvesicles as risk markers for venous thrombosis. Expert Rev Hematol 2014; 6:91-101. [DOI: 10.1586/ehm.12.74] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Butenas S. Tissue factor structure and function. SCIENTIFICA 2012; 2012:964862. [PMID: 24278763 PMCID: PMC3820524 DOI: 10.6064/2012/964862] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 11/19/2012] [Indexed: 06/02/2023]
Abstract
Tissue factor (TF) is an integral membrane protein that is essential to life. It is a component of the factor VIIa-TF complex enzyme and plays a primary role in both normal hemostasis and thrombosis. With a vascular injury, TF becomes exposed to blood and binds plasma factor VIIa, and the resulting complex initiates a series of enzymatic reactions leading to clot formation and vascular sealing. Many cells, both healthy, and tumor cells, produce detectable amounts of TF, especially when they are stimulated by various agents. Despite the relative simplicity and small size of TF, there are numerous contradictory reports about the synthesis and presentation of TF on blood cells and circulation in normal blood either on microparticles or as a soluble protein. Another subject of controversy is related to the structure/function of TF. It has been almost commonly accepted that cell-surface-associated TF has low (if any) activity, that is, is "encrypted" and requires specific conditions/reagents to become active, that is, "decrypted." However there is a lack of agreement related to the mechanism and processes leading to alterations in TF function. In this paper TF structure, presentation, and function, and controversies concerning these features are discussed.
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Affiliation(s)
- Saulius Butenas
- Department of Biochemistry, University of Vermont, 208 South Park Drive, Room 235A, Colchester, VT 05446, USA
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Park MS, Owen BAL, Ballinger BA, Sarr MG, Schiller HJ, Zietlow SP, Jenkins DH, Ereth MH, Owen WG, Heit JA. Quantification of hypercoagulable state after blunt trauma: microparticle and thrombin generation are increased relative to injury severity, while standard markers are not. Surgery 2012; 151:831-6. [PMID: 22316436 DOI: 10.1016/j.surg.2011.12.022] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Accepted: 12/22/2011] [Indexed: 11/16/2022]
Abstract
BACKGROUND Major trauma is an independent risk factor for developing venous thromboembolism. While increases in thrombin generation and/or procoagulant microparticles have been detected in other patient groups at greater risk for venous thromboembolism, such as cancer or coronary artery disease, this association has yet to be documented in trauma patients. This pilot study was designed to characterize and quantify thrombin generation and plasma microparticles in individuals early after traumatic injury. METHODS Blood was collected in the trauma bay from 52 blunt injured patients (cases) and 19 uninjured outpatients (controls) and processed to platelet poor plasma to allow for (1) isolation of microparticles for identification and quantification by flow cytometry, and (2) in vitro thrombin generation as measured by calibrated automatic thrombography. Data collected are expressed as either mean ± standard deviation or median with interquartile range. RESULTS Among the cases, which included 39 men and 13 women (age, 40 ± 17 years), the injury severity score was 13 ± 11, the international normalized ratio was 1.0 ± 0.1, the thromboplastin time was 25 ± 3 seconds, and platelet count was 238 ± 62 (thousands). The numbers of total (cell type not specified) procoagulant microparticles, as measured by Annexin V staining, were increased compared to nontrauma controls (541 ± 139/μL and 155 ± 148/μL, respectively; P < .001). There was no significant difference in the amount of thrombin generated in trauma patients compared to controls; however, peak thrombin was correlated to injury severity (Spearman correlation coefficient R, 0.35; P = .02). CONCLUSION Patients with blunt trauma have greater numbers of circulating procoagulant microparticles and increased in vitro thrombin generation. Future studies to characterize the cell-specific profiles of microparticles and changes in thrombin generation kinetics after traumatic injury will determine whether microparticles contribute to the hypercoagulable state observed after injury.
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Affiliation(s)
- Myung S Park
- Department of Surgery, Mayo Clinic, Rochester, MN, USA.
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Emmerechts J, Loyen S, Hoylaerts M. Microparticle number or procoagulant activity are not upregulated in healthy elderly persons. Thromb Res 2012; 129:98-100. [DOI: 10.1016/j.thromres.2011.09.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 08/25/2011] [Accepted: 09/08/2011] [Indexed: 10/17/2022]
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Evaluation of the procoagulant activity of endogenous phospholipids in the platelet-free plasma of children with sickle cell disease using functional assays. Thromb Res 2011; 130:259-64. [PMID: 22079446 DOI: 10.1016/j.thromres.2011.10.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 10/17/2011] [Accepted: 10/18/2011] [Indexed: 11/20/2022]
Abstract
BACKGROUND The mechanisms of hypercoagulability in sickle cell disease (SCD) are poorly understood. OBJECTIVE We aimed to explore the procoagulant activity of endogenous phospholipids (ePL) in the platelet-free plasma of SCD children. METHODS A factor Xa clotting time (XACT), thrombin generation (TG) and a capture-based assay for the detection of procoagulant microparticles (PMP) were used. Forty three SCD children (35 SS, 6 SC and 2 Sβ+) were evaluated at steady-state and compared to 20 controls. Fourteen patients were also evaluated during vaso-occlusive crisis. TG was performed using 10 pM tissue factor without addition of exogenous phospholipids. A control condition was also performed using 10 pM tissue factor and 4 μM phospholipids. Percentages of the test/control conditions were calculated for the peak height (% peak), endogenous thrombin potential (% ETP) and velocity index (% VI). RESULTS XACT times were shorter, PMP levels, peak height and velocity index of thrombin generation were higher in SCD patients than controls. Lag time and ETP were not different between the two groups. % peak, % ETP and % VI were higher in patients than controls. Significant correlations were found between PMP levels and XACT, also between PMP levels and peak height, velocity index, ETP and their respective percentages to the control condition, but not with lag time. Double heterozygous patients showed intermediate values for XACT and TG parameters. No significant difference was observed when comparing patients at steady-state versus vaso-occlusive crisis. CONCLUSION High procoagulant activity of ePL was observed in the platelet-free plasma of SCD children, probably borne by procoagulant microparticles. This may contribute to a high hemostatic potential and predisposition to thrombotic complications in these patients.
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Jayachandran M, Miller VM, Heit JA, Owen WG. Methodology for isolation, identification and characterization of microvesicles in peripheral blood. J Immunol Methods 2011; 375:207-14. [PMID: 22075275 DOI: 10.1016/j.jim.2011.10.012] [Citation(s) in RCA: 160] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 10/03/2011] [Accepted: 10/19/2011] [Indexed: 10/15/2022]
Abstract
RATIONALE Analyses of circulating cell membrane-derived microvesicles (MV) have come under scrutiny as potential diagnostic and prognostic biomarkers of disease. However, methods to isolate, label and quantify MV have been neither systematized nor validated. OBJECTIVE To determine how pre-analytical, analytical and post-analytical factors affect plasma MV counts, markers for cell of origin and expression of procoagulant surface phosphatidylserine. METHODS AND RESULTS Peripheral venous blood samples were collected from healthy volunteers and patients with cardiovascular disease and/or diabetes. Effects of blood sample collection, anticoagulant and sample processing to platelet free plasma (PFP), and MV isolation, staining and storage (freeze-thaw) and cytometer design were evaluated with replicate samples from these populations. The key finding is that use of citrate or EDTA anticoagulants decreases or eliminates microvesicles from plasma by inducing adhesion of the microvesicles to platelets or other formed elements. Protease inhibitor anticoagulants, including heparin, preserve MV counts. A centrifugation protocol was developed in which recovery of isolated MV was high with resolution down to the equivalent light scatter of 0.2 μm latex beads. Each procedure was systematically evaluated for its impact on the MV counts and characteristics. CONCLUSION This study provides a systematic methodology for MV isolation, identification and quantification, essential for development of MV as diagnostic and prognostic biomarkers of disease.
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Affiliation(s)
- Muthuvel Jayachandran
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN 55905, United States.
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