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Generation of murine hematopoietic precursor cells from macrophage high-proliferative-potential colony-forming cells
I K McNiece1, N T Williams, G R Johnson
1Biological Research Unit, Cancer Institute, Melbourne, Victoria, Australia.
Abstract:
High-proliferative-potential colony-forming cells (HPP-CFC) have been described as primitive murine macrophage progenitors. We have previously demonstrated the existence of two populations of HPP-CFC: one population, termed HPP-CFC-1, is stimulated by the combination of macrophage colony-stimulating factor (CSF-1) plus haemopoietin-1 (H-1) and actively generates a second population of HPP-CFC, termed HPP-CFC-2. HPP-CFC-2 are stimulated by CSF-1 plus interleukin-3 and generate macrophage CFC that differentiate to form mature macrophages. In this study, we have demonstrated that HPP-CFC-1, when stimulated by CSF-1 plus H-1, generate colony-forming cells (CFC) for the megakaryocyte and granulocyte lineages in addition to HPP-CFC-2 and M-CFC. No CFC were detected with erythroid potential. In addition, HPP-CFC-1 generated cells that formed day-13 spleen colonies, cells that repopulated the bone marrow, cells with platelet-repopulating ability, and cells with erythroid-repopulating ability in lethally irradiated mice. These data support previous data that the HPP-CFC-1 represent a primitive hemopoietic cell population and demonstrate the multipotentiality but not totipotentiality of these cells.
Insights
High-proliferative-potential colony-forming cells (HPP-CFC)-1 are primitive hematopoietic stem cells. These cells generate multiple lineages, including megakaryocytes and granulocytes, demonstrating their multipotent nature.
Area of Science:
- Hematopoiesis
- Stem Cell Biology
- Immunology
Background:
- High-proliferative-potential colony-forming cells (HPP-CFC) are considered primitive murine macrophage progenitors.
- Two HPP-CFC populations exist: HPP-CFC-1 (stimulated by CSF-1 + H-1) and HPP-CFC-2 (stimulated by CSF-1 + IL-3).
- HPP-CFC-1 generates HPP-CFC-2, which then produce macrophage colony-forming cells (M-CFC) differentiating into mature macrophages.
Purpose of the Study:
- To investigate the differentiation potential of HPP-CFC-1 stimulated by CSF-1 plus H-1.
- To determine if HPP-CFC-1 can generate other hematopoietic lineages beyond macrophages.
- To assess the in vivo repopulating capacity of HPP-CFC-1.
Main Methods:
- In vitro stimulation of HPP-CFC-1 with CSF-1 and H-1.
- Assay for colony-forming cells (CFC) across various lineages (macrophage, megakaryocyte, granulocyte, erythroid).
- In vivo studies using lethally irradiated mice to assess spleen colony formation, bone marrow repopulation, and lineage-specific repopulating ability (platelets, erythrocytes).
Main Results:
- HPP-CFC-1 stimulated by CSF-1 + H-1 generated HPP-CFC-2, M-CFC, megakaryocyte CFC, and granulocyte CFC.
- No erythroid CFC were detected in vitro.
- In vivo, HPP-CFC-1 generated cells forming day-13 spleen colonies, repopulating bone marrow, and demonstrating platelet- and erythroid-repopulating ability.
Conclusions:
- HPP-CFC-1 represent a primitive hematopoietic cell population.
- HPP-CFC-1 exhibit multipotency, capable of generating multiple hematopoietic lineages.
- The data suggest HPP-CFC-1 are multipotent but not totipotent.