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Stimulation of in vitro granulocyte--macrophage colony formation by mouse heart conditioned medium
Insights
Mouse heart tissue releases colony-stimulating factors (CSF) that stimulate granulocyte and macrophage colony formation from mouse bone marrow cells. Both heart-derived CSF and endotoxin serum CSF showed similar effects on colony-forming cells (CFU-c) density distribution.
Area of Science:
- Hematopoiesis research
- Stem cell biology
- Cytokine research
Background:
- Colony-stimulating factors (CSF) are crucial for hematopoiesis, regulating the production of granulocytes and macrophages.
- Mouse heart tissue conditioned medium was identified as a potential source of CSF.
- Understanding CSF heterogeneity and its effect on different progenitor cells is essential.
Purpose of the Study:
- To compare the colony-stimulating activity of mouse heart conditioned medium (CSFMHCM) with post-endotoxin mouse serum (CSFES).
- To investigate the effect of these CSFs on density subpopulations of colony-forming cells (CFU-c).
- To analyze the number, size, and morphology of colonies formed.
Main Methods:
- Isopycnic centrifugation in a continuous albumin density gradient to separate CFU-c subpopulations.
- Culturing of separated CFU-c with CSFMHCM and CSFES.
- Microscopic examination of in vitro granulocyte and macrophage colonies.
Main Results:
- CSFMHCM induced slightly more and larger colonies compared to CSFES.
- Both CSFMHCM and CSFES demonstrated similar density distributions for CFU-c.
- Low-density CFU-c predominantly formed granulocytic colonies, while high-density CFU-c formed macrophage colonies, irrespective of the CSF source.
- No correlation was observed between colony size and CFU-c density.
Conclusions:
- Mouse heart conditioned medium contains potent CSF with comparable activity to endotoxin-induced CSF.
- CSF activity is influenced by the density of CFU-c, with distinct progenitor populations giving rise to granulocytes or macrophages.
- This study highlights the potential of tissue-derived factors in regulating hematopoiesis.
Abstract:
Medium conditioned by mouse heart tissue was found to contain colony-stimulating factor(s) (CSF) which produced in vitro colonies of granulocytes and/or macrophages with bone marrow cells of CBA mice. The action of this CSF type (CSFMHCM) was compared with that of post-endotoxin mouse serum (CSFES on colony formation by density subpopulations of colony-forming cells (CFU-c), separated by isopycnic centrifugation in a continous albumin density gradient. The number, size and morphology of colonies were examined. Mouse heart conditioned medium produced slightly more colonies and of larger size than endotoxin serum but the density distribution of their CFU-c were similar. Low density CFU-c produced predominately pure granulocytic colonies and high density ones predominately pure macrophage colonies with both types of CSF. There was no apparent relationship between colony size and CFU-c density.