Abstract
Ribonucleic acid (RNA) transfection of dendritic cells (DCs) was shown to be highly efficient in eliciting CD8+ and CD4+ T-cell responses. We analyzed whether electroporation of DCs with RNA coding for a tumor-associated antigen (TAA) would elicit antigen-specific effector cytotoxic T lymphocyte (CTL) responses and whether these responses could be modulated by cotransfection with a second specific synthetic RNA. Therefore in vitro generated human monocyte-derived DCs were electroporated with in vitro transcribed RNA (in vitro transcript, IVT) encoding the TAA HER-2/neu. Additionally, these cells were cotransfected with IVT coding for human 4-1BBL. Transfection of DCs with 4-1BBL-IVT did not alter their typical phenotype. However, it increased the expression of the costimulatory molecules CD80 and CD40. Coadministration of HER-2/neu- and 4-1BBL-IVT resulted in an increased specific lysis of target cells by the in vitro induced CTL lines, indicating that 4-1BBL enhances their ability to elicit primary CTL responses. Interestingly, transfection of DCs with 4-1BBL-IVT did not augment their capacity to stimulate allogeneic lymphocyte responses. The here established approach of cotransfection of DCs with tumor-RNA and a second specific IVT could improve and optimize the in vitro manipulation of DCs for the induction of antigen-specific CTL responses.
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Acknowledgements
We thank Bruni Schuster, Sylvia Stephan, and Regina Heselmaier for excellent technical assistance. This work was supported by Deutsche Forschungsgemeinschaft (SFB 510, Project B2) and University of Tübingen (fortüne-project, F.1282620.1).
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Grünebach, F., Kayser, K., Weck, M. et al. Cotransfection of dendritic cells with RNA coding for HER-2/neu and 4-1BBL increases the induction of tumor antigen specific cytotoxic T lymphocytes. Cancer Gene Ther 12, 749–756 (2005). https://doi.org/10.1038/sj.cgt.7700842
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DOI: https://doi.org/10.1038/sj.cgt.7700842
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