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Experimental Therapeutics |
-Fetoprotein-specific Tumor Immunity Induced by Plasmid Prime-Adenovirus Boost Genetic Vaccination1
Divisions of Surgical Oncology [W. S. M., L. H. B., A. R., V. B. D., J. B. H., G. A. M., J. S. E.], Hematology-Oncology [A. R., J. A. G.], Experimental Radiation Oncology [W. H. M.], and the Department of Microbiology, Immunology, and Molecular Genetics [J. S. E.], University of California, Los Angeles, Los Angeles, California 90095
-Fetoprotein (AFP) is a potential target for immunotherapy in hepatocellular carcinoma; both the murine and human T-cell repertoires can recognize AFP-derived epitopes in the context of the MHC. Protective immunity can be generated with AFP-engineered dendritic cell-based vaccines. We now report a DNA-based immunization strategy using a prime-boost approach: coadministration of plasmid DNA encoding murine AFP and murine granulocyte-macrophage colony-stimulating factor followed by boosting with an AFP-expressing nonreplicating adenoviral vector. This immunization strategy can elicit a high frequency of Th1-type AFP-specific cells leading to tumor protective immunity in mice at levels comparable with AFP-engineered dendritic cells. This cell-free mode of immunization is better suited for large-scale vaccine efforts for patients with hepatocellular carcinoma.
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