26
|
Netelenbos T, Bouwsma H, Noort FA, de Groot I, de Fijter JW, Zwaginga JJ. Immune adsorption of anti-A/B antibodies prior to ABO-mismatched kidney transplantation: the Leiden experience. Transfus Apher Sci 2013; 48:185. [PMID: 23809827 DOI: 10.1016/j.transci.2013.02.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
27
|
Ypma PF, Kerkhoffs JLH, van Hilten JA, Middelburg RA, Coccoris M, Zwaginga JJ, Beckers EM, Fijnheer R, van der Meer PF, Brand A. The observation of bleeding complications in haemato-oncological patients: stringent watching, relevant reporting. Transfus Med 2012; 22:426-31. [PMID: 23036067 DOI: 10.1111/j.1365-3148.2012.01193.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 08/30/2012] [Accepted: 09/06/2012] [Indexed: 12/01/2022]
Abstract
BACKGROUND The reported percentage of haemato-oncological patients experiencing bleeding complications is highly variable, ranging from 5 to 70%, posing a major problem for comparison of clinical platelet transfusion trials using bleeding complications as a primary endpoint. In a pilot study we assessed the impact of the design of scoring of bleeding on the percentage of patients with WHO grade 2 or higher bleeding grades. STUDY DESIGN AND METHODS We performed a prospective, observational study using a rigorous bleeding observation system in thrombocytopenic patients with haemato-oncological disorders. Endpoints of the study were the percentage of patients and days with bleeding WHO grade ≥ 2 comparing designs in which skin bleeding represent a continuation of a previous bleed or a new bleed. RESULTS In four participating hospitals 64 patients suffering 870 evaluable thrombocytopenic days (platelet count < 80 × 10(9) L(-1)) were included. At least one episode of bleeding grade ≥ 2 occurred in 36 patients (56%). Most grade 2 bleeding complications occurred mucocutaneously. The percentage of days with bleeding of grade ≥ 2 was 16% but decreases to 8% when only newly developed skin bleeding was included. CONCLUSION Rigorous daily observation results in a bleeding incidence that is comparable to recent reportings applying the same method. The results of this study show that censoring for stable skin bleeding has a profound effect on bleeding incidence per day. The clinical relevance of rigorous or clinically judged bleeding scores as an endpoint remains to be defined.
Collapse
|
28
|
Gieger C, Radhakrishnan A, Cvejic A, Tang W, Porcu E, Pistis G, Serbanovic-Canic J, Elling U, Goodall AH, Labrune Y, Lopez LM, Mägi R, Meacham S, Okada Y, Pirastu N, Sorice R, Teumer A, Voss K, Zhang W, Ramirez-Solis R, Bis JC, Ellinghaus D, Gögele M, Hottenga JJ, Langenberg C, Kovacs P, O'Reilly PF, Shin SY, Esko T, Hartiala J, Kanoni S, Murgia F, Parsa A, Stephens J, van der Harst P, Ellen van der Schoot C, Allayee H, Attwood A, Balkau B, Bastardot F, Basu S, Baumeister SE, Biino G, Bomba L, Bonnefond A, Cambien F, Chambers JC, Cucca F, D'Adamo P, Davies G, de Boer RA, de Geus EJC, Döring A, Elliott P, Erdmann J, Evans DM, Falchi M, Feng W, Folsom AR, Frazer IH, Gibson QD, Glazer NL, Hammond C, Hartikainen AL, Heckbert SR, Hengstenberg C, Hersch M, Illig T, Loos RJF, Jolley J, Khaw KT, Kühnel B, Kyrtsonis MC, Lagou V, Lloyd-Jones H, Lumley T, Mangino M, Maschio A, Mateo Leach I, McKnight B, Memari Y, Mitchell BD, Montgomery GW, Nakamura Y, Nauck M, Navis G, Nöthlings U, Nolte IM, Porteous DJ, Pouta A, Pramstaller PP, Pullat J, Ring SM, Rotter JI, Ruggiero D, Ruokonen A, Sala C, Samani NJ, Sambrook J, Schlessinger D, Schreiber S, Schunkert H, Scott J, Smith NL, Snieder H, Starr JM, Stumvoll M, Takahashi A, Tang WHW, Taylor K, Tenesa A, Lay Thein S, Tönjes A, Uda M, Ulivi S, van Veldhuisen DJ, Visscher PM, Völker U, Wichmann HE, Wiggins KL, Willemsen G, Yang TP, Hua Zhao J, Zitting P, Bradley JR, Dedoussis GV, Gasparini P, Hazen SL, Metspalu A, Pirastu M, Shuldiner AR, Joost van Pelt L, Zwaginga JJ, Boomsma DI, Deary IJ, Franke A, Froguel P, Ganesh SK, Jarvelin MR, Martin NG, Meisinger C, Psaty BM, Spector TD, Wareham NJ, Akkerman JWN, Ciullo M, Deloukas P, Greinacher A, Jupe S, Kamatani N, Khadake J, Kooner JS, Penninger J, Prokopenko I, Stemple D, Toniolo D, Wernisch L, Sanna S, Hicks AA, Rendon A, Ferreira MA, Ouwehand WH, Soranzo N. New gene functions in megakaryopoiesis and platelet formation. Nature 2011; 480:201-8. [PMID: 22139419 PMCID: PMC3335296 DOI: 10.1038/nature10659] [Citation(s) in RCA: 309] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 10/21/2011] [Indexed: 12/23/2022]
Abstract
Platelets are the second most abundant cell type in blood and are essential for maintaining haemostasis. Their count and volume are tightly controlled within narrow physiological ranges, but there is only limited understanding of the molecular processes controlling both traits. Here we carried out a high-powered meta-analysis of genome-wide association studies (GWAS) in up to 66,867 individuals of European ancestry, followed by extensive biological and functional assessment. We identified 68 genomic loci reliably associated with platelet count and volume mapping to established and putative novel regulators of megakaryopoiesis and platelet formation. These genes show megakaryocyte-specific gene expression patterns and extensive network connectivity. Using gene silencing in Danio rerio and Drosophila melanogaster, we identified 11 of the genes as novel regulators of blood cell formation. Taken together, our findings advance understanding of novel gene functions controlling fate-determining events during megakaryopoiesis and platelet formation, providing a new example of successful translation of GWAS to function.
Collapse
|
29
|
Roest M, Reininger A, Zwaginga JJ, King MR, Heemskerk JWM. Flow chamber-based assays to measure thrombus formation in vitro: requirements for standardization. J Thromb Haemost 2011; 9:2322-4. [PMID: 22947397 DOI: 10.1111/j.1538-7836.2011.04492.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
30
|
Zalpuri S, Zwaginga JJ, le Cessie S, Elshuis J, Schonewille H, van der Bom JG. Red-blood-cell alloimmunization and number of red-blood-cell transfusions. Vox Sang 2011; 102:144-9. [PMID: 21729098 DOI: 10.1111/j.1423-0410.2011.01517.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Patients receiving red-blood-cells may form antibodies against the alloantigens expressed by red-blood-cells, with the risk of serious morbidity and the need for extensive phenotype-matching in subsequent transfusions. The incidence of alloimmunization is considered variable for specific patient groups and for first time antibody formation. We therefore studied the cumulative incidence of the first formed alloantibody as a function of red-blood-cells exposure. METHODS We performed a new-user cohort among all previously non-transfused non-alloimmunized patients that received non-extended matched (ABO and RhD) red-blood-cells transfusions from January 2005 to December 2009 in our university medical centre. Alloimmunization incidences were estimated by Kaplan-Meier survival-analysis. RESULTS A total of 3002 previously non-transfused patients received 31103 red-blood-cell units. A first time alloantibody forming event was experienced by 54 (1·8%) patients. The cumulative incidence of alloimmunization was 1·0% at 5 units, 2·4% at 10 units, 3·4% at 20 units and 6·5% at 40 units of red-blood-cells transfused. CONCLUSION The risk to develop a first red-blood-cells alloantibody increases up to the 40th transfusion and is similar for men and women. More data are needed to examine the risk after 40th transfusion.
Collapse
|
31
|
Heemskerk JWM, Sakariassen KS, Zwaginga JJ, Brass LF, Jackson SP, Farndale RW. Collagen surfaces to measure thrombus formation under flow: possibilities for standardization. J Thromb Haemost 2011; 9:856-8. [PMID: 21595091 DOI: 10.1111/j.1538-7836.2011.04230.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
32
|
Snoep JD, Gaussem P, Eikenboom JCJ, Emmerich J, Zwaginga JJ, Holmes CE, Vos HL, de Groot PG, Herrington DM, Bray PF, Rosendaal FR, van der Bom JG. The minor allele of GP6 T13254C is associated with decreased platelet activation and a reduced risk of recurrent cardiovascular events and mortality: results from the SMILE-Platelets project. J Thromb Haemost 2010; 8:2377-84. [PMID: 20723028 DOI: 10.1111/j.1538-7836.2010.04018.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Contradictory results have been published on the effects of T13254C (rs1613662), which distinguishes the two major isoforms of GP6, the gene encoding the platelet receptor glycoprotein VI, on platelet function and the risk of cardiovascular disease. METHODS We performed a population-based case-control study, the Study of Myocardial Infarctions in Leiden, among 547 male patients with a first myocardial infarction (MI) and 646 control subjects, as well as a prospective cohort study in which the same MI patients were followed for recurrent events (fatal and non-fatal MI and unstable angina) and mortality (median follow-up of 12 years). P-selectin expression by platelets induced by crosslinked collagen-related peptide (CRP-XL) was measured by whole blood flow cytometry in 274 MI patients. RESULTS T13254C was not associated with a first MI, but seemed to be associated with a reduced incidence of recurrent events [per-allele hazard ratio 0.77, 95% confidence interval (CI) 0.56-1.06] and mortality (hazard ratio 0.57, 95% CI 0.37-0.89). Pooling with the Heart and Estrogen/Progestin Replacement Study revealed hazard ratios of 0.81 (95% CI 0.66-0.99) and 0.73 (95% CI 0.55-0.96). The minor C-allele was also strongly associated with a reduced percentage of P-selectin-expressing platelets. The reduction per C-allele was 23% (95% CI 18-28%). In an independent study of 219 healthy volunteers, the per-allele reduction of CRP-XL-induced aggregation was 10% (95% CI 2-18%). CONCLUSION The minor allele of GP6 T13254C that reduced platelet activation and aggregation also seemed to be associated with a reduced incidence of recurrent cardiovascular events and mortality, but was not associated with first MI.
Collapse
|
33
|
Vrielink H, Meijer B, van't Ende E, Ball LM, Brand A, Zwaginga JJ. Granulocyte transfusions for pediatric patients and the establishment of national treatment guidelines and donor registry. Transfus Apher Sci 2009; 41:73-6. [PMID: 19525147 DOI: 10.1016/j.transci.2009.05.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
G-CSF/dexamethasone stimulated donor derived granulocyte transfusion (GTX) has been shown in non-randomized studies to be a useful co-therapy in immune-compromised patients unresponsive to conventional antimicrobial treatments. Reports of GTX are however usually single institution adult experiences. Substantiated pediatric data, other than in neonates, is less common.
Collapse
|
34
|
O'Connor MN, Salles II, Cvejic A, Watkins NA, Walker A, Garner SF, Jones CI, Macaulay IC, Steward M, Zwaginga JJ, Bray SL, Dudbridge F, de Bono B, Goodall AH, Deckmyn H, Stemple DL, Ouwehand WH. Functional genomics in zebrafish permits rapid characterization of novel platelet membrane proteins. Blood 2009; 113:4754-62. [PMID: 19109564 PMCID: PMC2680375 DOI: 10.1182/blood-2008-06-162693] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2008] [Accepted: 11/14/2008] [Indexed: 01/27/2023] Open
Abstract
In this study, we demonstrate the suitability of the vertebrate Danio rerio (zebrafish) for functional screening of novel platelet genes in vivo by reverse genetics. Comparative transcript analysis of platelets and their precursor cell, the megakaryocyte, together with nucleated blood cell elements, endothelial cells, and erythroblasts, identified novel platelet membrane proteins with hitherto unknown roles in thrombus formation. We determined the phenotype induced by antisense morpholino oligonucleotide (MO)-based knockdown of 5 of these genes in a laser-induced arterial thrombosis model. To validate the model, the genes for platelet glycoprotein (GP) IIb and the coagulation protein factor VIII were targeted. MO-injected fish showed normal thrombus initiation but severely impaired thrombus growth, consistent with the mouse knockout phenotypes, and concomitant knockdown of both resulted in spontaneous bleeding. Knockdown of 4 of the 5 novel platelet proteins altered arterial thrombosis, as demonstrated by modified kinetics of thrombus initiation and/or development. We identified a putative role for BAMBI and LRRC32 in promotion and DCBLD2 and ESAM in inhibition of thrombus formation. We conclude that phenotypic analysis of MO-injected zebrafish is a fast and powerful method for initial screening of novel platelet proteins for function in thrombosis.
Collapse
|
35
|
van Beem RT, Verloop RE, Kleijer M, Noort WA, Loof N, Koolwijk P, van der Schoot CE, van Hinsbergh VWM, Zwaginga JJ. Blood outgrowth endothelial cells from cord blood and peripheral blood: angiogenesis-related characteristics in vitro. J Thromb Haemost 2009; 7:217-26. [PMID: 18983508 DOI: 10.1111/j.1538-7836.2008.03192.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND Blood outgrowth endothelial cells (BOEC) are good candidates for vascular (re-) generating cell therapy. Although cord blood (CB) BOEC have been reported as more proliferative than peripheral blood (PB) BOEC, not much is known about their functional properties. OBJECTIVES We have studied the following determinants in BOEC expanded from CB and PB: endothelial phenotype, in vitro adhesion, migration, proliferation, and angiogenic tube forming capacity. METHODS/RESULTS Endothelial phenotype of BOEC was evaluated by fluorescence activated cell sorting (FACS) analysis and confirmed the presence of endothelial markers including CD31, CD105, CD144, CD146, KDR/VEGFR-2, Tie-2, and TNF-alpha-induced VCAM-1 and ICAM-1. Evaluation of cell proliferation revealed a higher basal proliferation of CB-BOEC, which increased after exposure to bFGF but not VEGF. The lower basal proliferation of PB-BOEC increased with VEGF or bFGF addition. Array analysis of angiogenic genes showed many comparable expressions in both BOEC, and a slightly more pronounced pro-angiogenic profile in CB-BOEC than PB-BOEC. Both BOEC were able to form tubular structures in a three-dimensional fibrin matrix. Tube formation in CB-BOEC was markedly induced by TNF-alpha only and inhibited by anti-urokinase antibodies. It was comparable to that induced by combined addition of TNF-alpha and VEGF or bFGF, while maximal tube formation in PB-BOEC required simultaneous exposure to TNF-alpha/VEGF or TNF-alpha/bFGF. CONCLUSIONS The endothelial phenotype and characteristics for homing, adhesion, migration, inflammation, and angiogenic tube formation are almost equal for BOEC from CB and PB. A slightly more angiogenic phenotype favors CB-BOEC. However, addition of VEGF to PB-BOEC induces equal proliferation and tube formation.
Collapse
|
36
|
Reesink HW, Engelfriet CP, Hyland CA, Coghlan P, Tait B, Wsolak M, Keller AJ, Henn G, Mayr WR, Thomas I, Osselaer JC, Lambermont M, Beaten M, Wendel S, Qiu Y, Georgsen J, Krusius T, Mäki T, Andreu G, Morel P, Lefrère JJ, Rebulla P, Giovanelli S, Butti B, Lecchi L, Mozzi F, Van Hilten JA, Zwaginga JJ, Flanagan P, Flesland Ø, Brojer E, Łętowska M, Åkerblom O, Norda R, Prowse C, Dow B, Jarvis L, Davidson F, Kleinman S, Bianco C, Stramer SL, Dodd RY, Busch MP. Biobanks of blood from donors and recipients of blood products. Vox Sang 2008; 94:242-260. [PMID: 18225990 DOI: 10.1111/j.1423-0410.2007.01020.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
37
|
García-Vallejo JJ, van Liempt E, da Costa Martins P, Beckers C, van het Hof B, Gringhuis SI, Zwaginga JJ, van Dijk W, Geijtenbeek TBH, van Kooyk Y, van Die I. DC-SIGN mediates adhesion and rolling of dendritic cells on primary human umbilical vein endothelial cells through LewisY antigen expressed on ICAM-2. Mol Immunol 2008; 45:2359-69. [PMID: 18155766 DOI: 10.1016/j.molimm.2007.11.001] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2007] [Accepted: 11/07/2007] [Indexed: 11/28/2022]
Abstract
Immature dendritic cells (DCs) are recruited from blood into tissues to patrol for foreign antigens. After antigen uptake and processing, DCs mature and migrate to the secondary lymphoid organs where they initiate immune responses. DC-SIGN is a DC-specific C-type lectin that acts both as a pattern recognition receptor and as an adhesion molecule. As an adhesion molecule, DC-SIGN is able to mediate rolling and adhesion over endothelial cells under shear flow. In this study, we show that the binding partner of DC-SIGN on endothelial cells is the glycan epitope Lewis(Y) (Le(Y)), expressed on ICAM-2. The interaction between DC-SIGN on dendritic cells and ICAM-2 on endothelial cells is strictly glycan-specific. ICAM-2 expressed on CHO cells only served as a ligand for DC-SIGN when properly glycosylated, underscoring its function as a scaffolding protein. The expression of Le(Y) in endothelial cells is directed by the enzyme FUT1. Silencing of FUT1 results in a decrease in the rolling and adhesion of immature DCs over endothelial cells. The identification of Le(Y) as the carbohydrate ligand of DC-SIGN in endothelial cells opens new possibilities for the manipulation of DC migration.
Collapse
|
38
|
Zwaginga JJ, Sakariassen KS, King MR, Diacovo TG, Grabowski EF, Nash G, Hoylaerts M, Heemskerk JWM. Can blood flow assays help to identify clinically relevant differences in von Willebrand factor functionality in von Willebrand disease types 1-3? J Thromb Haemost 2007; 5:2547-9. [PMID: 17944987 DOI: 10.1111/j.1538-7836.2007.02807.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
|
39
|
Tijssen MR, van Hennik PB, di Summa F, Zwaginga JJ, van der Schoot CE, Voermans C. Transplantation of human peripheral blood CD34-positive cells in combination with ex vivo generated megakaryocytes results in fast platelet formation in NOD/SCID mice. Leukemia 2007; 22:203-8. [PMID: 17943170 DOI: 10.1038/sj.leu.2404979] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
40
|
da Costa Martins P, García-Vallejo JJ, van Thienen JV, Fernandez-Borja M, van Gils JM, Beckers C, Horrevoets AJ, Hordijk PL, Zwaginga JJ. P-Selectin Glycoprotein Ligand-1 Is Expressed on Endothelial Cells and Mediates Monocyte Adhesion to Activated Endothelium. Arterioscler Thromb Vasc Biol 2007; 27:1023-9. [PMID: 17322099 DOI: 10.1161/atvbaha.107.140442] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Objective—
The purpose of this study was to investigate the presence and functionality of P-selectin glycoprotein ligand-1 (PSGL-1) on activated endothelial cells (ECs).
Methods and Results—
We show here that PSGL-1 is expressed at the mRNA and protein levels in umbilical vein and microvascular ECs. Furthermore, this endothelial PSGL-1 (ePSGL-1) is functional and mediates adhesion of monocytes or platelet-monocyte complexes (PMCs) to the activated endothelium in a flow model. ePSGL-1 expression was not affected by treating ECs with inflammatory stimuli (tumor necrosis factor α, interleukin-1β, thrombin, or histamine). However, the functional binding capacity of ePSGL-1 to monocytes or P-selectin/Fc chimera significantly increased by stimulation of the ECs with TNFα. By means of a siRNA approach to specifically knock-down the genes involved in the glycosylation of PSGL-1 we could show that tumor necrosis factor α–induced glycosylation of ePSGL-1 is critical for its binding capacity.
Conclusion—
Our results show that ECs express functional PSGL-1 which mediates tethering and firm adhesion of monocytes and platelets to inflamed endothelium.
Collapse
|
41
|
Macaulay IC, Tijssen MR, Thijssen-Timmer DC, Gusnanto A, Steward M, Burns P, Langford CF, Ellis PD, Dudbridge F, Zwaginga JJ, Watkins NA, van der Schoot CE, Ouwehand WH. Comparative gene expression profiling of in vitro differentiated megakaryocytes and erythroblasts identifies novel activatory and inhibitory platelet membrane proteins. Blood 2006; 109:3260-9. [PMID: 17192395 PMCID: PMC6485507 DOI: 10.1182/blood-2006-07-036269] [Citation(s) in RCA: 130] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
To identify previously unknown platelet receptors we compared the transcriptomes of in vitro differentiated megakaryocytes (MKs) and erythroblasts (EBs). RNA was obtained from purified, biologically paired MK and EB cultures and compared using cDNA microarrays. Bioinformatical analysis of MK-up-regulated genes identified 151 transcripts encoding transmembrane domain-containing proteins. Although many of these were known platelet genes, a number of previously unidentified or poorly characterized transcripts were also detected. Many of these transcripts, including G6b, G6f, LRRC32, LAT2, and the G protein-coupled receptor SUCNR1, encode proteins with structural features or functions that suggest they may be involved in the modulation of platelet function. Immunoblotting on platelets confirmed the presence of the encoded proteins, and flow cytometric analysis confirmed the expression of G6b, G6f, and LRRC32 on the surface of platelets. Through comparative analysis of expression in platelets and other blood cells we demonstrated that G6b, G6f, and LRRC32 are restricted to the platelet lineage, whereas LAT2 and SUCNR1 were also detected in other blood cells. The identification of the succinate receptor SUCNR1 in platelets is of particular interest, because physiologically relevant concentrations of succinate were shown to potentiate the effect of low doses of a variety of platelet agonists.
Collapse
|
42
|
Zwaginga JJ, Sakariassen KS, Nash G, King MR, Heemskerk JW, Frojmovic M, Hoylaerts MF. Flow-based assays for global assessment of hemostasis. Part 2: current methods and considerations for the future. J Thromb Haemost 2006; 4:2716-7. [PMID: 16938128 DOI: 10.1111/j.1538-7836.2006.02178.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
43
|
Stevens W, Koene H, Zwaginga JJ, Vreugdenhil G. Chronic idiopathic thrombocytopenic purpura: present strategy, guidelines and new insights. Neth J Med 2006; 64:356-63. [PMID: 17122451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Idiopathic thrombocytopenic purpura (ITP) is an immune-mediated thrombocytopenia. The diagnosis is made after exclusion of other secondary causes of thrombocytopenic disorders. The primary treatment goal is to prevent severe bleeding rather than achieve normal platelet counts. In adults ITP usually has an insidious onset and chronic course. Although ITP is a relatively common haematological disorder, there are important unresolved issues in its management, especially for chronic refractory ITP patients. New therapeutic agents have changed strategies for ITP treatment. This article reviews the treatment indications and options of chronic ITP in adults in the literature and compares them with the treatment indications and treatment options used by the Dutch internist.
Collapse
|
44
|
Zwaginga JJ, Nash G, King MR, Heemskerk JWM, Frojmovic M, Hoylaerts MF, Sakariassen KS. Flow-based assays for global assessment of hemostasis. Part 1: Biorheologic considerations. J Thromb Haemost 2006; 4:2486-7. [PMID: 16938127 DOI: 10.1111/j.1538-7836.2006.02177.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
45
|
de Boer HC, Verseyden C, Ulfman LH, Zwaginga JJ, Bot I, Biessen EA, Rabelink TJ, van Zonneveld AJ. Fibrin and Activated Platelets Cooperatively Guide Stem Cells to a Vascular Injury and Promote Differentiation Towards an Endothelial Cell Phenotype. Arterioscler Thromb Vasc Biol 2006; 26:1653-9. [PMID: 16627804 DOI: 10.1161/01.atv.0000222982.55731.f1] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective—
Bone marrow-derived progenitor cells play a role in vascular regeneration. However, their homing to areas of vascular injury is poorly understood. One of the earliest responses to an injury is the activation of coagulation and platelets. In this study we assessed the role of hemostatic components in the recruitment of CD34
+
cells to sites of injury.
Methods and Results—
Using an ex vivo injury model, representing endothelial cell (EC) injury or vessel denudation, we studied homing of CD34
+
under flow. Platelet aggregates facilitated initial tethering and rolling of CD34
+
cells through interaction of P-selectin expressed by platelets and P-selectin glycoprotein ligand-1 (PSGL-1), expressed by CD34
+
cells. Ligation of PSGL-1 activated adhesion molecules on CD34
+
cells, ultimately leading to firm adhesion of CD34
+
cells to tissue factor-expressing ECs or to fibrin-containing thrombi formed on subendothelium. We also demonstrate that fibrin-containing thrombi can support migration of CD34
+
cells to the site of injury and subsequent differentiation toward a mature EC phenotype. Additionally, intravenously injected CD34
+
cells homed in vivo to denuded arteries in the presence of endogenous leukocytes.
Conclusions—
We provide evidence that hemostatic factors, associated with vascular injury, provide a regulatory microenvironment for re-endothelialization mediated by circulating progenitor cells.
Collapse
|
46
|
Martins PDC, Zwaginga JJ. Leukocyte-platelet aggregates: new particles reflecting and effecting cardiovascular disease. Thromb Haemost 2005; 94:1120-1. [PMID: 16411382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
|
47
|
Rouschop KMA, Roelofs JJTH, Claessen N, da Costa Martins P, Zwaginga JJ, Pals ST, Weening JJ, Florquin S. Protection against renal ischemia reperfusion injury by CD44 disruption. J Am Soc Nephrol 2005; 16:2034-43. [PMID: 15901765 DOI: 10.1681/asn.2005010054] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Inflammation contributes to renal ischemia reperfusion (I/R) injury, potentially causing renal dysfunction. The inflammatory infiltrate mainly consists of neutrophils, which are deleterious for the renal tissue. Because CD44 is expressed by neutrophils and is rapidly upregulated by capillary endothelial cells after I/R injury, it was hypothesized that CD44 might play an important role in the development of I/R injury. This study showed that rapid CD44 upregulation on renal capillary endothelial cells mediates neutrophil recruitment to the postischemic tissue. Hence, CD44 deficiency led to decreased influx of neutrophils regardless of comparable levels in chemotactic factors expressed in the kidney. The reduced influx of neutrophils was associated with preserved renal function and morphology. Adoptive transfer experiments of labeled neutrophils revealed that endothelial CD44 rather than neutrophil CD44 mediates neutrophil migration. Activation of neutrophils increased cell-surface expression of hyaluronic acid (HA). Altogether, a novel mechanism in the recruitment of neutrophils that involves interaction of endothelial CD44 and neutrophil HA was found. Either blocking endothelial CD44 or removal of neutrophil HA decreased rolling and adhesion of neutrophils. Administration of anti-CD44 to mice reduced the influx of neutrophils into the postischemic tissue, associated with renal function preservation. Therefore, anti-CD44-based therapies may contribute to prevent or reduce renal I/R injury.
Collapse
|
48
|
Tijssen MR, van der Schoot CE, Voermans C, Zwaginga JJ. The (patho)physiology of megakaryocytopoiesis: from thrombopoietin in diagnostics and therapy to ex vivo generated cellular products. Vox Sang 2005; 87 Suppl 2:52-5. [PMID: 15209879 DOI: 10.1111/j.1741-6892.2004.00500.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
49
|
Hunting CB, Noort WA, Zwaginga JJ. Circulating endothelial (progenitor) cells reflect the state of the endothelium: vascular injury, repair and neovascularization. Vox Sang 2005; 88:1-9. [PMID: 15663716 DOI: 10.1111/j.1423-0410.2005.00589.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An increase in the number of circulating endothelial cells (CEC) and of bone marrow-derived endothelial progenitor cells (EPC) in the peripheral blood is associated with vascular injury, repair and neovascularization. The phenotype and number of CEC may serve as diagnostic or prognostic parameters of vascular injury and tumour growth. An increase in the number of EPC may reflect repair of ischaemic vascular injury, a finding which has resulted in the initiation of clinical cardiovascular pilot trials using cell therapy. However, there is no consensus on the exact phenotype of the EPC and haematopoietic stem cells (HSC) and therefore the best candidate cell for transplant has not been established. Although the use of peripheral blood stem cells following mobilization, or of ex vivo-expanded cells, may improve EPC-mediated vascular graft endothelialization or tissue vascularization, sustained EPC-induced neovascularization still needs to be proven. Flow cytometric characterization, in combination with functional assays, will further elucidate the phenotype of the CEC and EPC, thereby providing reliable detection to appreciate their role in vascular diseases and cancer and to evaluate and, if possible, improve their therapeutic potential.
Collapse
|
50
|
Zwaginga JJ. Hemodialysis, erythropoietin and megakaryocytopoiesis: factors in uremic thrombocytopathy and thrombophilia. J Thromb Haemost 2004; 2:1272-4. [PMID: 15304030 DOI: 10.1111/j.1538-7836.2004.00839.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|