Abstract
We investigated the cause of myelofibrosis and proliferation of megakaryocytes in myelodysplastic syndrome with myelofibrosis (MDS-MF (+)). Plasma-transforming growth factor-β1 (PTGF-β1) concentrations closely correlated with myelofibrosis grade in MDS-MF (+) and were higher than those in idiopathic myelofibrosis (IMF), essential thrombocythemia (ET), idiopathic thrombocytopenic purpura (ITP), MDS-without MF (MDS-MF (−)) or healthy volunteers (HV). Peripheral blood mononuclear cells from MDS-MF (+) patients expressed more TGF-β1 mRNA than those from IMF, MDS-MF (−) or HV. When we immunostained bone marrow specimens of MDS-MF (+) for TGF-β, the intensity of blasts was apparently higher than that of megakaryocytes, while in MDS-MF (−), megakaryocytes were immunostained with a similar intensity as that in MDS-MF (+), but blasts were negative for staining. In IMF, megakaryocytes, monocytes and small mononuclear cells representing CD34+ cells were all similarly stained with a much lower intensity than that of blasts in MDS-MF (+). The number of bone marrow megakaryocytes were increased the most in MDS-MF (+), followed by ET, ITP, MDS-MF (−) and NHL and correlated with plasma thrombopoietin (TPO) levels or with plasma TGF-β1 levels, respectively, in each disease. Thus, in MDS-MF (+), both myelofibrosis and the increased megakaryocytes were ascribed to overproduction of TGF-β1 from blasts.
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The authors thank Mr Kevin Litton (Bachelor of arts in English) for editorial assistance.
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Akiyama, T., Matsunaga, T., Terui, T. et al. Involvement of transforming growth factor-β and thrombopoietin in the pathogenesis of myelodysplastic syndrome with myelofibrosis. Leukemia 19, 1558–1566 (2005). https://doi.org/10.1038/sj.leu.2403875
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DOI: https://doi.org/10.1038/sj.leu.2403875