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Updated: Oct 7, 2026
Generation and Identification of GM-CSF Derived Alveolar-like Macrophages and Dendritic Cells From Mouse Bone Marrow
Published on: June 25, 2016
Effects of GM-CSF deprivation on precursors of granulocytes and macrophages
Abstract:
Culture of C57BL bone marrow cells in the absence of GM-CSF led to a loss of recoverable granulocyte-macrophage colony-forming cells of 2% per hour. The rate of loss of progenitor cells in cultures of CBA fetal liver cells was 5-6% per hour. Surviving colony-forming cells exhibited a normal responsiveness to GM-CSF but generated smaller colonies than normal when subsequently stimulated by GM-CSF. Transfer of washed individual day-3 granulocyte-macrophage colony cells to cultures lacking GM-CSF indicated that most cells were unable to survive or proliferate in the absence of GM-CSF. Death of transferred cells was rapid and invariable when the cells were from macrophage-forming colonies. However some cells from 40-70% of granulocyte-forming colonies were able to undergo one or two divisions in the absence of GM-CSF. This phenomenon was seen most often with cells from colonies where matching colony cells exhibited a higher-than-average proliferative capacity in parallel stimulated cultures. The results indicate the difficulty that will be encountered in obtaining valid metabolic data from unstimulated populations of granulocyte-macrophage precursor cells. The ability of some granulocyte precursor cells to exhibit limited proliferation following GM-CSF deprivation suggests that significant amounts of GM-CSF may be bound to or be internalized in some precursor cells and result in cell division in the absence of GM-CSF from culture medium.
Insights
Granulocyte-macrophage colony-stimulating factor (GM-CSF) is crucial for hematopoietic progenitor cell survival. Some granulocyte precursors show limited proliferation without GM-CSF, possibly due to internalized factor.
Area of Science:
- Hematology
- Cell Biology
- Stem Cell Research
Background:
- Granulocyte-macrophage colony-stimulating factor (GM-CSF) is essential for the development and survival of myeloid progenitor cells.
- Understanding the dependence of these progenitor cells on GM-CSF is critical for interpreting experimental data and developing therapeutic strategies.
Purpose of the Study:
- To investigate the survival and proliferative capacity of granulocyte-macrophage progenitor cells in the absence of GM-CSF.
- To determine the fate of progenitor cells upon GM-CSF deprivation and explore potential mechanisms for limited survival.
Main Methods:
- Cultures of C57BL bone marrow and CBA fetal liver cells were established without GM-CSF.
- Recoverable colony-forming cells were quantified over time.
- Individual progenitor cells were transferred to GM-CSF-free conditions to assess survival and proliferation.
Main Results:
- Bone marrow cells showed a 2% per hour loss, while fetal liver cells exhibited a 5-6% per hour loss in GM-CSF-free cultures.
- Surviving cells responded to GM-CSF but formed smaller colonies.
- Macrophage precursors rapidly died without GM-CSF, whereas some granulocyte precursors underwent limited divisions.
Conclusions:
- Granulocyte-macrophage progenitor cells, especially macrophage precursors, have a high dependence on GM-CSF for survival.
- Limited proliferation in some granulocyte precursors suggests potential GM-CSF internalization or binding, complicating metabolic studies.
- These findings highlight challenges in studying unstimulated myeloid precursor cells.
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