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* Division of Immunology, Aichi Cancer Center Research Institute and
Department of Hematology and Chemotherapy, Aichi Cancer Center Hospital, Nagoya, Japan;
Immunology and
Transplantation Biology, Fred Hutchinson Cancer Research Center and University of Washington, Seattle, WA 98109;
¶ Department of Biological Systems, RIKEN BioResource Center, Tsukuba Institute, RIKEN, Tsukuba, Japan;
|| Second Department of Internal Medicine, Okayama University Medical School, Okayama, Japan; and
# Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan
The development of rapid, efficient, and safe methods for generating Ag-specific T cells is necessary for the clinical application of adoptive immunotherapy. We show that B cells stimulated with CD40 ligand and IL-4 (CD40-B cells) can be efficiently transduced with retroviral vectors encoding a model Ag, CMV tegument protein pp65 gene, and maintain high levels of costimulatory molecules after gene transfer. CTL lines specific for pp65 were readily generated in all four healthy CMV-seropositive donors by stimulating autologous CD8+ T cells with these transduced CD40-B cells, both of which were derived from 10 ml peripheral blood. ELISPOT assays revealed that the CTL lines used multiple HLA alleles as restricting elements. Thus, CD40-B cells transduced retrovirally with Ag-encoding cDNA can be potent APC and facilitate to generate Ag-specific CTL in vitro.
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