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Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Lentiviral vector-mediated autonomous differentiation of mouse bone marrow cells into immunologically potent dendritic cell vaccines.
Molecular Therapy 2007 May
Approaches facilitating generation of dendritic cell (DC) vaccines for clinical trials and enhancing their viability, bio-distribution, and capacity to stimulate antigen-specific immune responses are critical for immunotherapy. We programmed mouse bone marrow (BM) cells with lentiviral vectors (LV-GI4) so that they produced granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin-4 (IL-4) in an autonomous manner. DC/LV-GI4 cells underwent autonomous trans-differentiation to yield typical phenotypic characteristics of DCs. DC/LV-GI4 cells that self-differentiated either ex vivo or in vivo showed persistent and robust viability and stimulated high influx of DCs into draining lymph nodes (LNs). The immunostimulatory efficacy of DC/LV-GI4 cells was evaluated using MART1 and TRP2 as co-expressed melanoma antigens. Mice vaccinated with DC/LV-GI4 cells that self-differentiated in vitro or in vivo produced potent antigen-specific responses against melanoma, which correlated with protective and long-term therapeutic anti-tumor effects. Thus, DC precursors can be genetically engineered after a single ex vivo manipulation, resulting in DC vaccines with improved activity.
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