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Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells
Published on: February 21, 2018
In vivo induction of normal differentiation in myeloid leukemia cells
Abstract:
MGI(+)D(+), MGI(+)D(-), and MGI(-)D(-) mouse myeloid leukemic cells, which genetically differ in their competence to be induced to undergo normal cell differentiation in vitro by the normal macrophage- and granulocyte-inducing protein MGI, were analyzed for their ability to undergo cell differentiation in diffusion chambers in vivo. As after induction by MGI in vitro, MGI(+)D(+) clones were induced for Fc and C3 rosettes, lysozyme, and mature macrophages and granulocytes in normal syngeneic or allogeneic mice. MGI(+)D(-) clones were also induced in these mice for all these properties, although in vitro they were not induced by MGI for mature cells. The MGI(-)D(-) clones were induced in vivo for C3 and Fc rosettes, lysozyme, and intermediate stages but not for mature cells, whereas none of these properties were induced in these clones by MGI in vitro. Thus, certain types of myeloid leukemic cells differentiate better in vivo, possibly due to the presence of higher effective concentrations of MGI and/or other inducing factors, and MGI(+)D(+) and MGI(+)D(-) cells can completely differentiate in vivo to mature cells. In vivo differentiation was inhibited in mice treated with cyclophosphamide. It was also inhibited in various strains of nude mice, except for one MGI(+)D(+) clone, where it was inhibited in C57BL/6 but not in ICR nude mice. This MGI(+)D(+) clone was also the only clone that was induced to differentiate normally in vitro by a 23,000 molecular weight form of purified MGI. The results suggest that different clones respond to different molecular forms of MGI, which may be present in different proportions in some animals, that in vivo differentiation by MGI possibly with other factors may be regulated by cells involved in the immune response, and that this differentiation can be genetically controlled. Differentiation in vivo was enhanced by injection of conditioned medium containing MGI and by inoculation of MGI-producing cells, including normal granulocytes. This indicates that the induction of normal differentiation of myeloid leukemic cells in vivo can be enhanced by these treatments.
Insights
Mouse myeloid leukemic cells show enhanced differentiation in vivo compared to in vitro. This suggests MGI protein and other factors promote better cell development in living organisms, with potential immune regulation.
Area of Science:
- Hematology
- Cell Biology
- Immunology
Background:
- Mouse myeloid leukemic cells exhibit varying genetic competence for differentiation induction by macrophage- and granulocyte-inducing protein (MGI) in vitro.
- Analysis of MGI(+)D(+), MGI(+)D(-), and MGI(-)D(-) cell clones is crucial for understanding myeloid leukemic cell differentiation.
- In vitro studies show differential responses of leukemic cell clones to MGI induction.
Purpose of the Study:
- To investigate the in vivo differentiation capacity of different mouse myeloid leukemic cell clones in diffusion chambers.
- To compare in vivo differentiation with in vitro responses to MGI.
- To explore factors influencing myeloid leukemic cell differentiation in vivo, including MGI concentration, other inducing factors, immune regulation, and genetic control.
Main Methods:
- Culturing MGI(+)D(+), MGI(+)D(-), and MGI(-)D(-) mouse myeloid leukemic cells in diffusion chambers in vivo.
- Assessing differentiation markers such as Fc and C3 rosettes, lysozyme activity, and mature cell formation.
- Analyzing the effects of cyclophosphamide treatment and different strains of nude mice on in vivo differentiation.
- Investigating the role of specific MGI molecular forms and MGI-producing cells in enhancing differentiation.
Main Results:
- MGI(+)D(+) and MGI(+)D(-) clones showed complete differentiation into mature macrophages and granulocytes in vivo, unlike their limited in vitro response.
- MGI(-)D(-) clones exhibited partial differentiation in vivo (rosettes, lysozyme, intermediate cells) but not mature cells, whereas MGI did not induce differentiation in vitro.
- In vivo differentiation was inhibited by cyclophosphamide and in most nude mouse strains, suggesting immune system involvement.
- Specific MGI(+)D(+) clones responded to different MGI molecular weights in vitro, and in vivo differentiation was enhanced by MGI-conditioned medium and MGI-producing cells.
Conclusions:
- Certain myeloid leukemic cell types demonstrate superior differentiation in vivo, potentially due to higher effective concentrations of MGI and/or additional inducing factors.
- Complete in vivo differentiation to mature cells is achievable for MGI(+)D(+) and MGI(+)D(-) clones.
- In vivo MGI-mediated differentiation is influenced by the immune response and can be genetically controlled.
- Enhancing MGI levels through conditioned medium or MGI-producing cells effectively promotes normal myeloid leukemic cell differentiation in vivo.
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