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Immunology |
1 Department of Dermatology, University of Heidelberg, Heidelberg, Germany and 2 Department of Dermatology, University of Mainz, Mainz, Germany
Requests for reprints: Karsten Mahnke, Department of Dermatology, University of Heidelberg, Vosstrasse 3, 69115 Heidelberg, Germany. Phone: 49-6221-568170; Fax: 49-6221-561617; E-mail: karsten.mahnke{at}med.uni-heidelberg.de.
Anti (
)-DEC-205 antibodies target to the DEC-205 receptor that mediates antigen presentation to T cells by dendritic cells. To exploit these properties for immunization purposes, we conjugated the melanoma antigen tyrosinase-related protein (TRP)-2 to DEC-205 antibodies and immunized mice with these conjugates together with dendritic cell–activating oligonucleotides (CpG). Upon injection of the melanoma cell line B16, DEC-TRP immunized mice were protected against tumor growth. Even more important for clinical applications, we were able to substantially slow the growth of implanted B16 cells by injection of DEC-TRP2 conjugates into tumor bearing hosts. Approximately 70% of the animals were cured from existing tumors by treatment with DEC conjugates carrying two different melanoma antigens (TRP-2 and gp100). This protection was due to induction of melanoma-specific CD4 and CD8 responses. Thus, these data show that targeting of dendritic cells in situ by the means of antibody-antigen conjugates may be a novel way to induce long-lasting antitumor immunity.
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