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- W2079883687 abstract "Summary Dickkopf-3 (Dkk3) has been proposed as tumour suppressor gene and a marker for tumour blood vessels. We analysed the expression and function of Dkk3 in platelets and megakaryocytes from healthy controls and patients with BCR-ABL1-negative myeloproliferative neoplasms (MPN). Dkk3 protein and gene expression in platelets was compared with endothelial and other blood cell populations by ELISA, real-time PCR, and immunofluorescence. Moreover, megakaryocytes were isolated from bone marrow aspirates by CD61 microbeads. Immunohisto-chemical studies of Dkk3 expression were performed in essential thrombocythemia (ET), polycythemia vera (PV), primary myelofibrosis (PMF) and control reactive bone marrow cases (each n=10). Compared to all other blood cell populations platelets showed the highest concentration of Dkk3 protein (150 ± 19 ng/mg total protein). A strong DKK3 gene and protein expression was also observed in isolated megakaryocytes. Dkk3 co-localised with VEGF in α-granules of platelets and was released similar to VEGF upon stimulation. Addition of recombinant Dkk3 had no influence on blood coagulation (aPTT, INR) and platelet aggregation. Significantly more Dkk3+ megakaryocytes/mm2 could be found in bone marrow biopsies from patients with MPN (ET 40 ± 10, PV 31 ± 4, PMF 22 ± 3) than in controls (15 ± 3). The mean proportion of Dkk3+ megakaryocytes was increased in MPN as well (ET 83% ± 15%; PV 84% ± 12%; PMF 77% ± 8%) compared to controls (53% ± 11%). Dkk3+ megakaryocytes correlated with microvessel density in PV and PMF. We conclude that Dkk3 might be involved in the pathogenesis of MPN." @default.
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- W2079883687 date "2011-01-01" @default.
- W2079883687 modified "2023-09-23" @default.
- W2079883687 title "Increased Dkk3 protein expression in platelets and megakaryocytes of patients with myeloproliferative neoplasms" @default.
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- W2079883687 doi "https://doi.org/10.1160/th10-03-0172" @default.
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