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Updated: Aug 28, 2025
Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells
Published on: February 21, 2018
Hox-driven conditional immortalization of myeloid and lymphoid progenitors: Uses, advantages, and future potential
Shranjit S Lail1, Corey R Arnold2, Luiz G N de Almeida2
1Department of Medical Science, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
Abstract:
Those who study macrophage biology struggle with the decision whether to utilize primary macrophages derived directly from mice or opt for the convenience and genetic tractability of immortalized macrophage-like cell lines in in vitro studies. Particularly when it comes to studying phagocytosis and phagosomal maturation-a signature cellular process of the macrophage-many commonly used cell lines are not representative of what occurs in primary macrophages. A system developed by Mark Kamps' group, that utilizes conditionally constitutive activity of Hox transcription factors (Hoxb8 and Hoxa9) to immortalize differentiation-competent myeloid cell progenitors of mice, offers an alternative to the macrophage/macrophage-like dichotomy. In this resource, we will review the use of Hoxb8 and Hoxa9 as hematopoietic regulators to conditionally immortalize murine hematopoietic progenitor cells which retain their ability to differentiate into many functional immune cell types including macrophages, neutrophils, basophils, osteoclasts, eosinophils, dendritic cells, as well as limited potential for the generation of lymphocytes. We further demonstrate that the use of macrophages derived from Hoxb8/Hoxa9 immortalized progenitors and their similarities to bone marrow-derived macrophages. To supplement the existing data, mass spectrometry-based proteomics, flow cytometry, cytology, and in vitro phagosomal assays were conducted on macrophages derived from Hoxb8 immortalized progenitors and compared to bone marrow-derived macrophages and the macrophage-like cell line J774. We additionally propose the use of a standardized nomenclature to describe cells derived from the Hoxb8/Hoxa9 system in anticipation of their expanded use in the study of leukocyte cell biology.
Insights
Researchers developed a novel system using Hox transcription factors to create conditionally immortalized myeloid progenitor cells. These cells differentiate into functional macrophages, offering a better in vitro model for studying macrophage biology and phagocytosis.
Area of Science:
- Immunology
- Cell Biology
- Hematopoiesis
Background:
- Primary macrophages and immortalized cell lines present limitations for in vitro studies.
- Commonly used macrophage cell lines often do not accurately represent primary macrophage functions, especially phagocytosis and phagosomal maturation.
- A novel system utilizing Hox transcription factors offers a potential solution to this dichotomy.
Purpose of the Study:
- To review the use of Hoxb8 and Hoxa9 for conditionally immortalizing murine hematopoietic progenitor cells.
- To demonstrate the differentiation potential of these immortalized cells into various functional immune cells, including macrophages.
- To validate the utility of Hox-immortalized macrophages as a representative model for primary macrophages in research.
Main Methods:
- Conditional immortalization of murine hematopoietic progenitor cells using Hoxb8 and Hoxa9 transcription factors.
- Differentiation of immortalized progenitors into macrophages, neutrophils, dendritic cells, and other myeloid lineages.
- Comparative analysis of Hox-derived macrophages using mass spectrometry-based proteomics, flow cytometry, cytology, and in vitro phagosomal assays against bone marrow-derived macrophages and the J774 cell line.
Main Results:
- Hoxb8/Hoxa9 immortalized progenitors successfully differentiate into multiple functional immune cell types, notably macrophages.
- Macrophages derived from Hox-immortalized progenitors exhibit similarities to primary bone marrow-derived macrophages.
- Proteomics, flow cytometry, and phagosomal assays confirm the functional relevance of Hox-derived macrophages as a model system.
Conclusions:
- The Hoxb8/Hoxa9 system provides a valuable tool for generating conditionally immortalized myeloid progenitor cells.
- Macrophages derived from this system serve as a more representative in vitro model compared to traditional cell lines for studying macrophage biology.
- Standardized nomenclature is proposed for cells derived from the Hoxb8/Hoxa9 system to facilitate their broader adoption in leukocyte research.
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