[Src kinases in the process of maturation megakryocyte progenitors]

Src family protein tyrosine kinases play key roles in cell morphology, proliferation, motility, and survival in megakaryocytopoiesis. Six of Src family kinases (Fyn, Lyn, Fgr, Hck, Src and Yes), are present in megakaryocytes (Mks). Src kinases are negative factors of megakaryocytopoiesis induced by thrombopoietin. The inhibitors of Src kinases might be useful as agents inducing maturation of Mks. The experiments with inhibitors of Src kinases used in culture of Mk progenitors and potential megakaryocyte cell lines gave new information about the role of Src kinases in the development of Mks. The pyrrolo-pyrimidyne reagents family and highly selective inhibitor, SU6656, are known and used inhibitors of Src kinases. The presence of inhibitor in ex vivo culture of Mk progenitors blocks proliferation and simultaneously induces the changes in cell morphology, phenotype and ploidy level, indicating the maturation of the cells. The inhibitors of Src kinases also might play the therapeutic role. Dasatinib, dual Bcr-Abl/Src kinase inhibitor, is of high activity and induces hematologic and cytogenetic responses in patients with chronic myelogenous leukaemia in blast crisis.