Bone marrow stromal cells in myeloproliferative disorders

Area of Science:

• Hematology
• Stem Cell Biology
• Oncology

Background:

• Myeloproliferative disorders (MPD) are a group of clonal hematopoietic stem cell diseases.
• Bone marrow stromal cells play a crucial role in hematopoiesis and can be affected in MPD.
• Fibroblastoid colony-forming cells (CFU-F) and adipocyte colony-forming capacity (adipo-CFC) are indicators of stromal cell function.

Purpose of the Study:

• To investigate the characteristics of bone marrow stromal cells and their precursors in patients with various myeloproliferative disorders.
• To compare CFU-F numbers and adipo-CFC in chronic-phase and acute-phase MPD with normal controls.

Main Methods:

• Studied 71 patients with myeloproliferative disorders (MPD).
• Quantified bone marrow-derived fibroblastoid colony-forming cells (CFU-F).
• Assessed bone marrow adipocyte colony-forming capacity (adipo-CFC) and colony-stimulating activity (CSA) production by stromal cells.

Main Results:

• CFU-F numbers were similar to normal in chronic-phase chronic myelogenous leukemia (CML), polycythemia vera (PV), and essential thrombocythemia (ET), but decreased in acute-phase CML.
• Adipo-CFC was increased in chronic-phase CML, PV, and ET, but absent in acute-phase CML.
• Colony-stimulating activity (CSA) production by marrow stromal cells was not different from normal subjects across MPD types.

Conclusions:

• Marrow stromal and precursor cell characteristics are generally normal in chronic-phase MPD.
• Significant alterations in marrow stromal and precursor cells, particularly adipo-CFC, are observed in acute-phase CML.
• These findings highlight distinct changes in bone marrow microenvironment during disease progression in MPD.