Abstract
Differentiation mechanisms and inflammatory functions of neutrophils and macrophages are usually studied by genetic and biochemical approaches that require costly breeding and time-consuming purification to obtain phagocytes for functional analysis. Because Hox oncoproteins enforce self-renewal of factor-dependent myeloid progenitors, we queried whether estrogen-regulated Hoxb8 (ER-Hoxb8) could immortalize macrophage or neutrophil progenitors that would execute normal differentiation and normal innate immune function upon ER-Hoxb8 inactivation. Here we describe methods to derive unlimited quantities of mouse macrophages or neutrophils by immortalizing their respective progenitors with ER-Hoxb8 using different cytokines to target expansion of different committed progenitors. ER-Hoxb8 neutrophils and macrophages are functionally superior to those produced by many other ex vivo differentiation models, have strong inflammatory responses and can be derived easily from embryonic day 13 (e13) fetal liver of mice exhibiting embryonic-lethal phenotypes. Using knockout or small interfering RNA (siRNA) technologies, this ER-Hoxb8 phagocyte maturation system represents a rapid analytical tool for studying macrophage and neutrophil biology.
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Acknowledgements
This work is supported by Public Health Service grant (National Institutes of Health CA56876) awarded to M.P.K. We thank D. Young for assistance with FACS analysis, and G. Chun and W. Westra at Scripps Research Foundation for collaborating in the spectral karyotype analysis.
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Supplementary information
Supplementary Fig. 1
SKY karyotype analysis of Hoxb8-ER macrophage progenitors cultured 2.5 years. (TIFF 912 kb)
Supplementary Fig. 2
Verification of changes observed on Affymetrix arrays. (TIFF 1162 kb)
Supplementary Fig. 3
A concerted program of phagocytic differentiation follows inactivation of Hoxb8-ER in both neutrophil and macrophage progenitors. (TIFF 2397 kb)
Supplementary Fig. 4
Inflammatory signaling pathways are preserved in macrophages derived from Hoxb8-ER GM-CSF progenitors. (TIFF 940 kb)
Supplementary Table 1
Expression of genes encoding transcription factors, cell cycle regulators, and proteins involved in myeloid innate immunity, assessed during neutrophil differentiation of SCF Hoxb8-ER progenitors and during macrophage differentiation of GM-CSF Hoxb8-ER progenitors. (PDF 37 kb)
Supplementary Table 2
Gene down-regulation in SCF Hoxb8-ER neutrophil progenitors and in GM-CSF Hoxb8-ER macrophage progenitors during terminal differentiation. (PDF 19 kb)
Supplementary Table 3
Gene up-regulation in SCF Hoxb8-ER neutrophil progenitors and in GM-CSF Hoxb8-ER macrophage progenitors during terminal differentiation. (PDF 35 kb)
Supplementary Table 4
Inflammatory response of GM-CSF Hoxb8-ER macrophages to LPS or BLP. (PDF 30 kb)
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Wang, G., Calvo, K., Pasillas, M. et al. Quantitative production of macrophages or neutrophils ex vivo using conditional Hoxb8. Nat Methods 3, 287–293 (2006). https://doi.org/10.1038/nmeth865
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DOI: https://doi.org/10.1038/nmeth865
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