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Characteristics of circulating megakaryocyte progenitors (CFU-MK) in patients with primary myelofibrosis
Z C Han1, J Briere, G Nedellec
1Department of Haematology, Augustin Morvan Hospital, Medical Center of Brest University, France.
Abstract:
Characteristics of circulating CFU-MK and the effect of serum and plasma on CFU-MK growth were studied in 14 patients with primary myelofibrosis (MF) using short- and long-term culture methods. The number of CFU-MK in short-term cultures was significantly increased in the non-splenectomized patient group (p less than 0.01). Without added PHA-LCM and normal serum, spontaneous colony formation was found in 9 out of 10 patients. In long-term blood cultures from 6 MF patients, 3 untreated patients formed confluent adherent layers and produced in suspension an equal number or an even greater number of nucleated cells, megakaryocytes and CFU-MK than those obtained in long-term bone marrow culture from normal individuals. 2 splenectomized patients showed neither an increased numbers of CFU-MK nor the capacity to develop an adherent layer. The serum and plasma of MF patients failed to stimulate megakaryocyte colony formation by normal bone marrow in a normal fashion. These findings indicate a megakaryocytopoietic abnormality, and a central role of the spleen in extramedullary haematopoiesis in MF.
Insights
Primary myelofibrosis patients show abnormal megakaryocyte colony-forming units (CFU-MK) in blood cultures. The spleen plays a key role in extramedullary hematopoiesis for these patients.
Area of Science:
- Hematology
- Cell Biology
Background:
- Primary myelofibrosis (MF) is a myeloproliferative neoplasm characterized by bone marrow fibrosis.
- Megakaryocytopoiesis, the process of megakaryocyte development, is often abnormal in MF.
Purpose of the Study:
- To investigate the characteristics of circulating megakaryocyte colony-forming units (CFU-MK) in MF patients.
- To evaluate the effect of patient serum and plasma on CFU-MK growth.
- To determine the role of the spleen in extramedullary hematopoiesis in MF.
Main Methods:
- Utilized short- and long-term culture methods to assess CFU-MK.
- Analyzed blood and bone marrow cultures from 14 MF patients.
- Assessed the impact of patient serum and plasma on normal bone marrow cultures.
Main Results:
- Significantly increased CFU-MK in short-term cultures of non-splenectomized MF patients.
- Spontaneous CFU-MK colony formation observed in most MF patients without added stimulants.
- Long-term blood cultures from untreated MF patients showed robust cell production, comparable or superior to normal bone marrow cultures.
- Splenectomized MF patients lacked increased CFU-MK and adherent layer formation.
- MF patient serum and plasma did not support normal megakaryocyte colony formation in normal bone marrow.
Conclusions:
- MF patients exhibit a megakaryocytopoietic abnormality.
- The spleen is crucial for extramedullary hematopoiesis in primary myelofibrosis.
- Splenectomy may impair compensatory hematopoietic mechanisms in MF.