Functional activity of hemopoietic and stromal cells in various types of myelodysplastic syndrome

Using clonal methods for assessment of hemopoietic and stromal cells and long-term bone marrow cell cultures, we have demonstrated heterogeneity of myelodysplastic syndrome. Low content of stromal precursor cells in native bone marrow, peculiarities in the formation of the stromal layer and its hemopoiesis-stimulating capacity in long-term cultures, and altered properties of stromal precursor cells in long-term cultures indicate defect in the stromal microenvironment in myelodysplastic syndrome.