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Dendritic cells (DC) loaded with specific peptides are strongly immunogenic for T cells and can be used for cancer immunotherapy. For immunogenic tumors such as melanoma, injection of autologous DC loaded with tumor cell extracts or peptides can induce tumor regression but in only a small proportion of patients. Nevertheless, recent studies on the efficacy of checkpoint blockade for boosting antitumor immunity plus advances in defining tumor neoantigens are stimulating renewed interest in DC immunotherapy. Despite intensive investigation, however, preparation of bulk populations of mature DC has proved difficult, and most preparations contain a significant proportion of potentially tolerogenic immature DC. In this study, we have modified the well-established GM-CSF culture system to prepare substantial quantities of highly pure (&gt;95%) mature DC from mouse bone marrow cells and defined their progenitors. We show that obtaining high yields and purity of DC are heavily dependent on cell density in the cultures and the tempo of addition of growth and maturation stimuli. When loaded with specific peptide, the DC are strongly immunogenic for CD4 and CD8 T cells in vivo and elicit effective antitumor immunity.

GM-CSF Culture Revisited: Preparation of Bulk Populations of Highly Pure Dendritic Cells from Mouse Bone Marrow