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Density of granulomonocytic colony-forming cells (GM-CFC's) in myelofibrosis
Insights
In myelofibrosis, circulating granulocyte-macrophage colony-forming cells (GM-CFCs) show a density profile similar to bone marrow but lower than normal circulating GM-CFCs. Higher GM-CFC blood levels correlate with lower mean density in these patients.
Area of Science:
- Hematology
- Stem Cell Biology
- Oncology
Background:
- Myelofibrosis with myeloid metaplasia is a myeloproliferative neoplasm characterized by bone marrow fibrosis and extramedullary hematopoiesis.
- Circulating hematopoietic stem and progenitor cells are often increased in myeloproliferative neoplasms, but their density distribution is not well understood in myelofibrosis.
Purpose of the Study:
- To investigate the density-distribution profile of circulating granulocyte-macrophage colony-forming cells (GM-CFCs) in patients with myelofibrosis.
- To compare the density profile of circulating GM-CFCs in myelofibrosis patients with normal controls.
Main Methods:
- Density gradient centrifugation was used to analyze the density distribution of GM-CFCs in the peripheral blood of 19 myelofibrosis patients.
- GM-CFCs were quantified using standard colony-forming assays.
Main Results:
- The density-distribution profile of circulating GM-CFCs in myelofibrosis patients was similar to that of normal bone marrow GM-CFCs.
- However, this profile was shifted toward lower densities compared to normal circulating GM-CFCs.
- A significant inverse correlation was observed: higher circulating GM-CFC concentrations were associated with lower mean GM-CFC density within individual patients.
Conclusions:
- The findings suggest that the premature release of GM-CFCs into the blood in myelofibrosis may be a characteristic of the underlying neoplastic hematopoietic stem cell clone.
- This altered density profile could reflect changes in the stem cell population or its interaction with the bone marrow microenvironment.
Abstract:
The circulating GM-CFC density-distribution profile was studied in 19 cases of myelofibrosis with myeloid metaplasia. The distribution profile for the population studied appeared to be similar to that of normal bone marrow GM-CFC's but shifted toward lower densities in comparison with normal circulating GM-CFC's. For individual patients, it appeared that the greater the circulating blood GM-CFC's concentration, the lower the mean density. It appears likely that the premature release into blood of the GM-CFC's in myelofibrosis is a property of the neoplastic haematopoietic stem cell clone at the core of the disease.