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Updated: May 31, 2026
Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
Published on: December 27, 2017
In vitro megakaryocyte differentiation and proplatelet formation in Ph-negative classical myeloproliferative
Alessandra Balduini1, Stefania Badalucco, Maria Teresa Pugliano
1Department of Biochemistry, University of Pavia, Pavia, Italy. alessandra.balduini@unipv.it
Background:
Ph-negative myeloproliferative neoplasms (MPNs) are clonal disorders that include primary myelofibrosis (PMF), polycythemia vera (PV) and essential thrombocythemia (ET). Although the pathogenesis of MPNs is still incompletely understood, an involvement of the megakaryocyte lineage is a distinctive feature.
Methodology/Principal Findings:
We analyzed the in vitro megakaryocyte differentiation and proplatelet formation in 30 PMF, 8 ET, 8 PV patients, and 17 healthy controls (CTRL). Megakaryocytes were differentiated from peripheral blood CD34(+) or CD45(+) cells in the presence of thrombopoietin. Megakaryocyte output was higher in MPN patients than in CTRL with no correlation with the JAK2 V617F mutation. PMF-derived megakaryocytes displayed nuclei with a bulbous appearance, were smaller than ET- or PV-derived megakaryocytes and formed proplatelets that presented several structural alterations. In contrast, ET- and PV-derived megakaryocytes produced more proplatelets with a striking increase in bifurcations and tips compared to both control and PMF. Proplatelets formation was correlated with platelet counts in patient peripheral blood. Patients with pre-fibrotic PMF had a pattern of megakaryocyte proliferation and proplatelet formation that was similar to that of fibrotic PMF and different from that of ET.
Conclusions/Significance:
In conclusion, MPNs are associated with high megakaryocyte proliferative potential. Profound differences in megakaryocyte morphology and proplatelet formation distinguish PMF, both fibrotic and prefibrotic, from ET and PV.
Insights
Myeloproliferative neoplasms (MPNs) show increased megakaryocyte proliferation. Distinct differences in megakaryocyte structure and proplatelet formation differentiate primary myelofibrosis (PMF) from essential thrombocythemia (ET) and polycythemia vera (PV).
Area of Science:
- Hematology
- Oncology
- Cell Biology
Background:
- Ph-negative myeloproliferative neoplasms (MPNs) are clonal disorders including primary myelofibrosis (PMF), polycythemia vera (PV), and essential thrombocythemia (ET).
- Megakaryocyte lineage involvement is a key feature in MPN pathogenesis, though not fully understood.
Purpose of the Study:
- To investigate in vitro megakaryocyte differentiation and proplatelet formation in MPN patients.
- To compare these processes between different MPN subtypes (PMF, ET, PV) and healthy controls.
Main Methods:
- Analyzed megakaryocyte differentiation and proplatelet formation from peripheral blood CD34(+) or CD45(+) cells in 30 PMF, 8 ET, 8 PV patients, and 17 controls.
- Cells were cultured with thrombopoietin.
Main Results:
- MPN patients exhibited higher megakaryocyte output than controls, irrespective of JAK2 V617F mutation status.
- PMF megakaryocytes were smaller, with bulbous nuclei and altered proplatelets.
- ET and PV megakaryocytes showed increased proplatelet formation with more bifurcations and tips compared to controls and PMF.
- Proplatelet formation correlated with peripheral blood platelet counts.
- Pre-fibrotic PMF displayed megakaryocyte patterns similar to fibrotic PMF and distinct from ET.
Conclusions:
- MPNs are characterized by a high megakaryocyte proliferative potential.
- Significant differences in megakaryocyte morphology and proplatelet formation distinguish PMF (both fibrotic and pre-fibrotic) from ET and PV.
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