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- W2031992121 abstract "Abstract It has been found that c-Myc protein plays a critical role in controlling self-renewal versus differentiation in hematopoietic stem cells. We report that c-Myc also controls the fate of megakaryocyte-erythrocyte progenitors through regulating the differentiation of erythroid and megakaryocytic progenitors. In addition to the significant reduction of granulocytes/macrophages and B and T lymphocytes because of the reduction of their corresponding progenitors, we found significantly increased numbers of megakaryocytic progenitors and mature megakaryocytes in bone marrow and spleens of c-Myc-knockout (c-Myc−/−) mice. Differentiation of erythrocytes was blocked at the erythroid progenitor stage. This increased megakaryocytopoiesis is a cell-intrinsic defect of c-Myc-mutant hematopoietic stem cells, as shown by transplantation studies. Furthermore, we found that c-Myc is required for polyploidy formation but not for cytoplasmic maturation of megakaryocytes. Megakaryocytes from c-Myc−/− mice are significantly smaller in size and lower in ploidy than those of control mice; however, because of the dramatic increase in megakaryocyte number, although fewer platelets are produced by each megakaryocyte, a greater than 3-fold increase in platelet number was consistently observed in c-Myc−/− mice. Thus, c-Myc−/− mice develop a syndrome of severe thrombocytosis-anemia-leukopenia because of significant increases in megakaryocytopoiesis and concomitant blockage of erythrocyte differentiation and reductions in myelolymphopoiesis." @default.
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- W2031992121 date "2009-09-03" @default.
- W2031992121 modified "2023-10-12" @default.
- W2031992121 title "c-Myc–mediated control of cell fate in megakaryocyte-erythrocyte progenitors" @default.
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- W2031992121 doi "https://doi.org/10.1182/blood-2009-01-197947" @default.
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