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Mechanisms responsible for size differences between hemopoietic colonies: an analysis using a CSF-dependent
1Cancer Research Unit, Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Victoria, Australia.
International Journal of Cell Cloning
|March 1, 1992
Summary
Colony stimulating factor (CSF)-dependent cells form diverse colony sizes. Differences in colony size are not explained by proliferation or CSF response, but possibly by random cell division patterns.
Area of Science:
- Hematopoiesis and stem cell biology
- Cellular differentiation and proliferation
Background:
- Continuous hemopoietic cell lines, such as 32Dcl-3, are crucial models for studying hematopoiesis.
- Colony stimulating factor (CSF) is essential for the growth and differentiation of myeloid cells.
Purpose of the Study:
- To investigate the factors contributing to the observed size heterogeneity of colonies formed by 32Dcl-3 cells.
- To determine if differences in clonogenic cell responsiveness to CSF explain colony size variation.
Main Methods:
- Culturing 32Dcl-3 cells in semisolid media to assess colony formation.
- Reculturing cells from different-sized colonies to evaluate their clonogenic potential.
- Clone mapping studies on both 32Dcl-3 and normal murine granulocyte-macrophage colonies.
Main Results:
- All colony types (large, medium, small) contained clonogenic cells capable of forming all three sizes.
- Late initiation of colony formation did not account for size differences.
- Clonogenic cells within colonies showed varied CSF responsiveness, generally lower than initiating cells, and higher in small colonies.
Conclusions:
- Differences in intrinsic proliferative potential, hierarchy, cell cycle, or CSF responsiveness do not adequately explain colony size variation.
- Colony size heterogeneity may arise from stochastic differences in the balance of self-renewal versus differentiation divisions in developing clones.