Abstract
Mouse dendritic cells (DCs) are routinely generated based on cells isolated form the bone marrow (BM) and cultured in the presence of growth factors that support DC development, such as FMS-like tyrosine kinase 3 ligand (FLT3L) and granulocyte-macrophage colony-stimulating factor (GM-CSF) (Guo et al., J Immunol Methods 432:24–29, 2016). In response to these growth factors, DC progenitors expand and differentiate, while other cell types die during the in vitro culture period, ultimately leading to relatively homogenous DC populations. An alternative method, which is discussed in detail in this chapter, relies on conditional immortalization of progenitor cells with DC potential in vitro using an estrogen-regulated form of Hoxb8 (ERHBD-Hoxb8). Such progenitors are established by retroviral transduction of largely unseparated BM cells with a retroviral vector expressing ERHBD-Hoxb8. Treatment of ERHBD-Hoxb8-expressing progenitors with estrogen results in Hoxb8 activation, which blocks cell differentiation and allows for expansion of homogenous progenitor cell populations in the presence of FLT3L. These cells, referred to as Hoxb8-FL cells, retain lineage potential for lymphocyte and myeloid lineages, including the DC lineage. Upon removal of estrogen (inactivation of Hoxb8), Hoxb8-FL cells differentiate into highly homogenous DC populations in the presence of GM-CSF or FLT3L akin to their endogenous counterparts. Given their unlimited proliferative capacity and amenability for genetic manipulation, for example, by CRISPR/Cas9, these cells provide a large number of options to investigate DC biology. Here, I am describing the method to establish Hoxb8-FL cells from mouse BM, as well as procedures for DC generation and gene deletion using lentivirally delivered CRISPR/Cas9.
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Acknowledgments
The CD18-sgRNA vector was generously provided by M. Sixt. This work was supported by NIH grant R01 AI145877 to H.H.
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Häcker, H. (2023). In Vitro Generation of Murine Dendritic Cells from Hoxb8-Immortalized Hematopoietic Progenitors. In: Sisirak, V. (eds) Dendritic Cells. Methods in Molecular Biology, vol 2618. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2938-3_7
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DOI: https://doi.org/10.1007/978-1-0716-2938-3_7
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