Abstract
Mature megakaryocytes (MKs) are large cells, having an approximate diameter in humans of 20–40 μm. They develop from CD34+ multipotent hematopoietic progenitors through a complex differentiation process driven primarily by the hormone thrombopoietin (TPO) (reviewed in refs. 1,2). The cellular hierarchy of the megakaryocytic lineage comprises three types of cells (3,4): MK progenitors, immature MKs or promegakaryoblasts, and mature MKs (Fig. 1). MK progenitors (HPP-CFU, BFU and CFU in Fig. 1; see caption for definitions) are a functionally heterogeneous group of cells, endowed with varying degrees of proliferative capacity, all of which express the surface antigen CD34. Promegakaryoblasts are transitional cells, intermediate between the proliferating progenitor cells and the mature, differentiated MKs (5). They are also a heterogeneous group of cells, which undergo polyploidization during development and increase their size and cytoplasmic complexity. Mature MKs are polyploid cells that no longer proliferate but have the unique ability to shed their cytoplasm (6), and as a result, produce in the order of 2000–3000 platelets/cell. In addition to TPO, other pleiotropic growth factors and cytokines (see Fig. 1) can act synergistically on hematopoietic progenitors to promote the growth and maturation of MK (7–9).
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Mathur, A., Hong, Y., Wang, G., Erusalimsky, J.D. (2004). Assays of Megakaryocyte Development. In: Gibbins, J.M., Mahaut-Smith, M.P. (eds) Platelets and Megakaryocytes. Methods In Molecular Biology™, vol 272. Humana Press. https://doi.org/10.1385/1-59259-782-3:309
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DOI: https://doi.org/10.1385/1-59259-782-3:309
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