[HTML][HTML] Lymphocytes genetically modified to express tumor antigens target DCs in vivo and induce antitumor immunity

V Russo, A Cipponi, L Raccosta… - The Journal of …, 2007 - Am Soc Clin Investig
V Russo, A Cipponi, L Raccosta, C Rainelli, R Fontana, D Maggioni, F Lunghi, S Mukenge…
The Journal of clinical investigation, 2007Am Soc Clin Investig
The exploitation of the physiologic processing and presenting machinery of DCs by in vivo
loading of tumor-associated antigens may improve the immunogenic potential and clinical
efficacy of DC-based cancer vaccines. Here we show that lymphocytes genetically modified
to express self/tumor antigens, acting as antigen carriers, efficiently target DCs in vivo in
tumor-bearing mice. The infusion of tyrosinase-related protein 2–transduced (TRP-2–
transduced) lymphocytes induced the establishment of protective immunity and long-term …
The exploitation of the physiologic processing and presenting machinery of DCs by in vivo loading of tumor-associated antigens may improve the immunogenic potential and clinical efficacy of DC-based cancer vaccines. Here we show that lymphocytes genetically modified to express self/tumor antigens, acting as antigen carriers, efficiently target DCs in vivo in tumor-bearing mice. The infusion of tyrosinase-related protein 2–transduced (TRP-2–transduced) lymphocytes induced the establishment of protective immunity and long-term memory in tumor-bearing mice. Analysis of the mechanism responsible for the induction of such an immune response allowed us to demonstrate that cross-presentation of the antigen mediated by the CD11c+CD8α+ DC subset had occurred. Furthermore, we demonstrated in vivo and in vitro that DCs had undergone activation upon phagocytosis of genetically modified lymphocytes, a process mediated by a cell-to-cell contact mechanism independent of CD40 triggering. Targeting and activation of secondary lymphoid organ–resident DCs endowed antigen-specific T cells with full effector functions, which ultimately increased tumor growth control and animal survival in a therapeutic tumor setting. We conclude that the use of transduced lymphocytes represents an efficient method for the in vivo loading of tumor-associated antigens on DCs.
The Journal of Clinical Investigation