M-07e Cells

The M-07e cell line is a subline derived from the original M-07 human leukemic cell line, which was established from the peripheral blood of a 6-month-old girl diagnosed with acute megakaryoblastic leukemia (AML M7). This particular subline was isolated to create a factor-dependent cell line that requires interleukin-3 (IL-3) or granulocyte macrophage colony-stimulating factor (GM-CSF) for growth, even in the presence of fetal calf serum. M-07e cells exhibit robust proliferation in response to a variety of cytokines, including GM-CSF, interferons (IFN-alpha, IFN-beta, IFN-gamma), IL-2, IL-3, IL-4, IL-6, IL-15, nerve growth factor (NGF), stem cell factor (SCF), tumor necrosis factor-alpha (TNF-alpha), and thrombopoietin (TPO). However, their dependency on IL-3 or GM-CSF for sustained growth makes them a valuable tool in bioassays designed to measure the biological activity of these specific cytokines.

Notably, M-07e cells are highly sensitive to IL-3 and GM-CSF, making them ideal for use in assays where detecting low levels of these cytokines is crucial. For instance, bioassays using M-07e cells can detect as little as 25-50 pg/mL of IL-3 or GM-CSF, making it comparable to or even more sensitive than traditional assays like the CFU-GM or CML blast proliferation assays. However, the cell line has a tendency to become cytokine-independent within 3-4 weeks in culture, likely due to the outgrowth of cytokine-independent subpopulations, which suggests careful monitoring is necessary when using these cells for long-term studies. The availability of exome and RNA sequence data further enhances the utility of M-07e cells in research focused on leukemia and hematopoiesis.

M-07e cells have also been employed to establish a quantitative bioassay for GM-CSF and IL-3, which is essential in both clinical and research settings. The bioassay developed with this cell line has proven to be convenient, reliable, and sensitive, making it particularly useful for assessing the pharmacological effects of hematopoietic growth factor therapies. The detailed responsiveness of M-07e cells to various cytokines, combined with their well-documented growth characteristics, underscores their value in experimental hematology, particularly in studies related to leukemia and the therapeutic application of cytokines.